Corvette Performance - Pit-man \ Rev-Extreme Stroker update

Well, if dropping a valve at 6500 rpm on New Years Eve wasn't bad enough, my AFR head got hammered, piston broke and cylinder scarred. So off to the machine shop for a sleeve in # 6 and then Tracy at Rev-Extreme was going to start on my stroker. Everything looked good till the machine shop cracked my block putting in the sleeve. Tracy was able to find a used LS6 block for $250. Here is where we are today. AFR heads went in for repair..parts arriving daily.

New Block http://i160.photobucket.com/albums/t176/SportSide/NewBlockhonedandreadyforstrokerkit.jpg
New Cam bearings
http://i160.photobucket.com/albums/t176/SportSide/Newcambearingsin.jpg
My Fast is ported and new TB in place
http://i160.photobucket.com/albums/t176/SportSide/FastportednewTB.jpg

Pit-man

Looking good pittman..... I'm curious as to why the new fuel rails???? Plus i'm really curious why the TB appears to be upside down??? The actuator looks like its on the opposite side? Is there something you're not telling us?

Looking good pittman..... I'm curious as to why the new fuel rails???? Plus i'm really curious why the TB appears to be upside down??? The actuator looks like its on the opposite side? Is there something you're not telling us?

Z, if you notice, the fuel rails are about 75% larger than the original. Tracy is running some stealth nitrous lines inside the fake larger rails. He saw your post about adding a 100 shot to kick my a*s and came up with a plan...haha.

I don't know whats up with the new rails actually or about the TB. I know when I put on the Fast and LS2TB last year, I had to mount it upside down because it wouldn't fit because of the power steering. I think the new vetts might be that way also ?? See the pic of my old setup below.

http://i160.photobucket.com/albums/t176/SportSide/DSC01073.jpg

By the way, what brand tire are you using for skinny's ? Are they 16" ?

Pit.

Running some nice azz Sumitoma or some cheap azz radial up front like you're not supposed to :) 15in

Nice man can't wait to see your results when it's all finished up!

I will try to post some pic's as I go.

Just got word my AFR heads survived..so back with my 225's.

Pit

This is what an AFR head looks like when you drop a valve at 6500 rpm...will make you sick !!:bang:
http://i160.photobucket.com/albums/t176/SportSide/AFRValveAssault.jpg

Pit

This is what an AFR head looks like when you drop a valve at 6500 rpm...will make you sick !!:bang:
http://i160.photobucket.com/albums/t176/SportSide/AFRValveAssault.jpg

Pit

That is almost any head when that happens.

That is almost any head when that happens.

No doub Sig..probably 200-300 hits before I shut her down. That would beat up anything. Thank goodness they can be repaired.
Pit

Update from Tracy @ Rev-Xtreme...waiting on heads...due any day now. I decided to go with fixing my AFR 225's instead of new heads. Pete Incaudo dropped by Tracy's and inspected the heads. He said to fix them, they wern't that bad at all. He gets them all the time in worse condition than mine.

Pic of engine bay http://i160.photobucket.com/albums/t176/SportSide/Waitingon383.jpg

Pic of paint protection http://i160.photobucket.com/albums/t176/SportSide/Paintprotection.jpg

Won't be long now...more pic's coming soon.
Pit

Update from Tracy @ Rev-Xtreme...waiting on heads...due any day now. I decided to go with fixing my AFR 225's instead of new heads. Pete Incaudo dropped by Tracy's and inspected the heads. He said to fix them, they wern't that bad at all. He gets them all the time in worse condition than mine.

Pic of engine bay http://i160.photobucket.com/albums/t176/SportSide/Waitingon383.jpg

Pic of paint protection http://i160.photobucket.com/albums/t176/SportSide/Paintprotection.jpg

Won't be long now...more pic's coming soon.
Pit


Heads may be back this Friday! :thumb:

Heads may be back this Friday! :thumb:

That would be great Tracy. I am soooo ready to get back in my z !!!
Bowling Green is waiting on me.
Pit

Tracy finally got moved into his new location, my heads are FINALLY back and below are the pics of parts waiting on Chris to do his majic ! Z promised back in 2 weeks...will keep you posted. More pic's and dyno sheet on the way soon. Lets rock and roll Chris !!!

http://i160.photobucket.com/albums/t176/SportSide/micropolishedcrank.jpg

http://i160.photobucket.com/albums/t176/SportSide/Balancesheet.jpg

http://i160.photobucket.com/albums/t176/SportSide/Pistons.jpg

Pit

Nice, I'm sure you're getting excited about it!

Houston, we have lift-off !! Crank in block, pistons waiting in line, pushing and shoving to be next.

http://i160.photobucket.com/albums/t176/SportSide/BobPbuild003.jpg


clearence necessary for stroker
http://i160.photobucket.com/albums/t176/SportSide/BobPbuild004.jpg

Pit

A little closer


http://i160.photobucket.com/albums/t176/SportSide/TopView.jpg

http://i160.photobucket.com/albums/t176/SportSide/Pistonsrodsin.jpg

http://i160.photobucket.com/albums/t176/SportSide/RepairedAFR.jpg

:chug:

Good luck with your build up! Must be exciting!

Yeah it is. Thx man
Pit

PTV check
http://i160.photobucket.com/albums/t176/SportSide/PTVcheck.jpg

rockers on
http://i160.photobucket.com/albums/t176/SportSide/Almostthere2.jpg

AFR'S
http://i160.photobucket.com/albums/t176/SportSide/Almostthere.jpg

pit :nod:

This is what an AFR head looks like when you drop a valve at 6500 rpm...will make you sick !!:bang:
http://i160.photobucket.com/albums/t176/SportSide/AFRValveAssault.jpg

Pit



fuck man.

fuck man.

My words exactly..LOL. All is good now..Tracy @ Rev-extreme getting ready to drop my motor back in this week. I am dying to see the dyno difference. Was at 433 rwhp and 400 tq before the valve drop.
Pit

motor ready and waiting

http://i160.photobucket.com/albums/t176/SportSide/ReadyandWaiting.jpg

http://i160.photobucket.com/albums/t176/SportSide/ReadyandWaiting2.jpg

http://i160.photobucket.com/albums/t176/SportSide/ReadyandWaiting3.jpg

Let see some dyno numbers Tracy\Chris :D

Pit

I"m guessing 510rwhp 484rwtq and you run 10.6's at 130mph and my car will still run like a POS!!!!!!!

I"m guessing 510rwhp 484rwtq and you run 10.6's at 130mph and my car will still run like a POS!!!!!!!

A 11.02 POS ...your kidding, right ??... Your all over it Bruce....that car is bad-azz. If you would take a tuner to the track with you, your probably sitting on 2 tenths. Wish you lived around here...my son or good friend could take you over the edge. We wittled 2 tenths out of both of ours right from the dyno tune. Are you possibly pulling timing from the heat...or still running a little rich ? How about your tranny shift points ? Did you open up your exhaust ? AF & Timing data logged on your runs ? I know you probably have this all covered..just wondering what is causing the bog you were talking about.
Lets talk shop when you get time ! I think you have my email but just in case bpittman@claryassoc.com

Any way you can data log a couple runs (even from a back road) and send me your tune ?? I will have it looked at and see if it is a tuning issue. I will bet you a meal at Bowling Green we can find you a tenth. We have EFI live and HP Tuners.

Pit

Who's fuel lines? or who's making them up? Need info for my Vic Jr single plane set-up, thanks.
Robert

http://i160.photobucket.com/albums/t176/SportSide/FastportednewTB.jpg

Hey Robt...see Tracy at Rev-Extreme...941-753-5255

Pit

Hey Robt...see Tracy at Rev-Extreme...941-753-5255

Pit
Wow, that's cool, as I have been in contact with Tracy through PM for the last week or so, just had no idea, lol.
Robert

Good luck with it Pit! Enjoy the new power.

Good luck with it Pit! Enjoy the new power.

Thanks Rob, we will see how it does !!
Pit

http://i160.photobucket.com/albums/t176/SportSide/SooooClose.jpg


Rev-x's new shop
http://i160.photobucket.com/albums/t176/SportSide/Dontscratchthepaintplease.jpg

Should be running tomorrow and get a tune on Wednesday !!!!!!! :D

Pit

motor in today and cranked.

http://i160.photobucket.com/albums/t176/SportSide/Motorin3.jpg

http://i160.photobucket.com/albums/t176/SportSide/Motorin5.jpg

http://i160.photobucket.com/albums/t176/SportSide/Motorin.jpg

http://i160.photobucket.com/albums/t176/SportSide/Motorin2.jpg

Waiting on the numbers now !!!

Pit

Well guys, I picked it up and trailered it home today. Just got back from a ride with my son...this thing is nasty with my 390 gear/M12 tranny...Holy crap. Here is a sound clip and remember it is idled a hair high..about 1000-1100. Third gear from a 25-30mph roll will fry the Nitto's. What a sweet motor and camshaft !!! Actual torque ended at 437 (I thought it was 434)...479rwhp. :nod:

http://s160.photobucket.com/albums/t176/SportSide/?action=view&current=MOV01270.flv

Hope to have a track vid soon.
Pit

GET THE BISHHHHH TO THE TRACK!!!!!!!!! Run a 10sec pass so I can cry some more!!!!!!!

Glad you got it back and are enjoying it again. I'm sure if feels strong with that torque!

GET THE BISHHHHH TO THE TRACK!!!!!!!!! Run a 10sec pass so I can cry some more!!!!!!!

Hell Z, I think I need you to drive..your as damn consistant as Ernie King (he has an auto) and Rob with his stick. I can't believe your runs are all the same...you would think with a stick you would vary a little. Take a vacation and come on down !! Gainesville is waiting on ya ! :D

Pit

Glad you got it back and are enjoying it again. I'm sure if feels strong with that torque!

Thanks Shoa...looks like they did a good job on the motor as well as Pete on the cam choice. Good thing I didn't settle on the more radical one...street maners might have been a question..lol

Pit

Hell Z, I think I need you to drive..your as damn consistant as Ernie King (he has an auto) and Rob with his stick. I can't believe your runs are all the same...you would think with a stick you would vary a little. Take a vacation and come on down !! Gainesville is waiting on ya ! :D

Pit

Thanks and dont tempt me, you may have someone knocking on your door saying wheres my room and the race track :)

Sound great Pit! :nod: Now all you need is a 3" exhaust system. :D
Get her to the track and post up some vids of your 10 sec runs! :nod:

Jimbo

Hey Jimbo,
Boy this new twin clutch is something..it is either engaged or it isn't...lol..Makes street driving take on a whole new meaning.

By the way...I lost 5 rwhp when the mufflers were disconnected. It loves that little bit of back pressure. That is exactly what Pete Incaudo told me on the phone when we were discussing a cam to use. Sure make it easier at the track, not having to use cutouts or take off the exhaust.

Going to put more miles on the clutch and watch the weather for a nice cool 80 degree, 50% humidity night...haha, then run to the track and get yelled at for no rollbar.
Pit

Hey Jimbo,
Boy this new twin clutch is something..it is either engaged or it isn't...lol..Makes street driving take on a whole new meaning.

By the way...I lost 5 rwhp when the mufflers were disconnected. It loves that little bit of back pressure. That is exactly what Pete Incaudo told me on the phone when we were discussing a cam to use. Sure make it easier at the track, not having to use cutouts or take off the exhaust.

Going to put more miles on the clutch and watch the weather for a nice cool 80 degree, 50% humidity night...haha, then run to the track and get yelled at for no rollbar.
Pit

Pit,
One of the main reasons I went with a single disc Tex 0Z700 is the horror stories I've hears about twins, especially the Exedy. What twin are you running? I know a few guys with the Centerforce dual disc and they seem to really like it.
I can slip my Tex pretty easy, and the way I have been breaking rear ends seems like I need to "refine" my launch technique and start slipping it more.
With your twin, you need to be aware of that! :nod:
Jimbo

Pit,
One of the main reasons I went with a single disc Tex 0Z700 is the horror stories I've hears about twins, especially the Exedy. What twin are you running? I know a few guys with the Centerforce dual disc and they seem to really like it.
I can slip my Tex pretty easy, and the way I have been breaking rear ends seems like I need to "refine" my launch technique and start slipping it more.
With your twin, you need to be aware of that! :nod:
Jimbo

I hear ya !! I am running the McLeod Twin...Alwaysinboost said it worked great for him..of course he has 8,000 rwhp..can't break anything with that..LOL..HE JUST SPINS WITH ANY TIRE PRESSURE.

Robz told me to come out a little easier with a little more tire pressure and work from there.

Pit

Go getem' Pit!
I might start @ 14-15 psi cold and launch around 5000 or slightly less and see what happens.
Do a good burnout too.
If you get the dreaded quick spin then bog, then you may need to go up 1/2 a pound each run until it goes away.
If you blow the tires away then lower the psi slowly.

Watch for that bog and eliminate it.
Put a long chalk mark on the tire and video so it can be seen clearly.
Another thought if you spin/bog is to have the clutch off the floor just below the engagement point when you launch.
Try it all and document! Keep us posted.

You had me till the chalk mark... not sure i'm understanding that one. :( Damn racer talk over my head again!! Wheres my dunce cap??? Pitt go pop a wheelie with that BISH!

Go getem' Pit!
I might start @ 14-15 psi cold and launch around 5000 or slightly less and see what happens.
Do a good burnout too.
If you get the dreaded quick spin then bog, then you may need to go up 1/2 a pound each run until it goes away.
If you blow the tires away then lower the psi slowly.

Watch for that bog and eliminate it.
Put a long chalk mark on the tire and video so it can be seen clearly.
Another thought if you spin/bog is to have the clutch off the floor just below the engagement point when you launch.
Try it all and document! Keep us posted.

Thanks Bro...will do !
Pit

You had me till the chalk mark... not sure i'm understanding that one. :( Damn racer talk over my head again!! Wheres my dunce cap??? Pitt go pop a wheelie with that BISH!

Hell Bruce, if it would pop a wheelie...I'd settle for my old 7.1 in the 1/8...take pictures, and tell everyone it ran 10.5...LOL :D
Pit

Man pittman that sounds nasty, good job. Could you tell me what exhaust you run front to rear (may have been stated but missed it I think)? My 1 7/8ths Kooks and 3inch no cats to the Z06 titanium does not sound nearly as good, whats the secret, lol?
Robert

Well guys, I picked it up and trailered it home today. Just got back from a ride with my son...this thing is nasty with my 390 gear/M12 tranny...Holy crap. Here is a sound clip and remember it is idled a hair high..about 1000-1100. Third gear from a 25-30mph roll will fry the Nitto's. What a sweet motor and camshaft !!! Actual torque ended at 437 (I thought it was 434)...479rwhp. :nod:

http://s160.photobucket.com/albums/t176/SportSide/?action=view&current=MOV01270.flv

Hope to have a track vid soon.
Pit

Go getem' Pit!
I might start @ 14-15 psi cold and launch around 5000 or slightly less and see what happens.
Do a good burnout too.
If you get the dreaded quick spin then bog, then you may need to go up 1/2 a pound each run until it goes away.
If you blow the tires away then lower the psi slowly.

Watch for that bog and eliminate it.
Put a long chalk mark on the tire and video so it can be seen clearly.
Another thought if you spin/bog is to have the clutch off the floor just below the engagement point when you launch.
Try it all and document! Keep us posted.

Sorry for the ignorance Rob, but could you explain the chaulk trick in a little detail? We are all still trying to catch your record 60'ers. :drive:
Robert

Chalk mark on the rear tire to see in the video if the tires are spinning (a blur) or it's hooking.

Bob, I expect traction issues with your suspension...may need to go w/some 90/10's on the front & adjustables on the rear...50/50 to start. It will pull the wheels off the ground then so get pics blown-up.

The key with his exhaust sound is the bad-boy cam.....

Man pittman that sounds nasty, good job. Could you tell me what exhaust you run front to rear (may have been stated but missed it I think)? My 1 7/8ths Kooks and 3inch no cats to the Z06 titanium does not sound nearly as good, whats the secret, lol?
Robert

Robert, not much different than yours. Running LG Longtubes, no cats thru stock TI mufflers. And by the way, if you didn't read...we lost 5 rwhp with open headers. The motor likes the little bit of back pressure.

Pit

Man, you guys with these crazy 60' times blow me away,,,,I guess I need a slushbox...my 87 GN used to regularly do 1.35 60's, and it is a bolt-on car, no internal mods and a stock short block! If I could get a 1.5 short time, my car the way it is now should be running 10.5's. With the the new motor I hope to see low 10's IF I bring my A-game. I know I can shift, but the IRS and that tiny ring gear are just not what I'm used to. Hey Pit,,,,,go get 'em man!
Here's how you need to shift-----:

http://i17.photobucket.com/albums/b72/jalembo/th_Powershifting.jpg (http://s17.photobucket.com/albums/b72/jalembo/?action=view&current=Powershifting.flv)

Jimbo

jimbo that was some great shifting. Fantastic video aswell. What has the car run thus far? IMO the car bogs there due to the launch RPM sounds low like around 4000rpm give or take. I launch my car at 5500rpm-6000rpm once the clutch is fully released. I still haven't perfected it like RobZ and hitting 1.4x's like i should but i can cut 1.5's almost all day now. Got any more vid's???? Pitt when you go giver hell I want vid's damnit!!!

Here's a couple more Bruce, burnout and the run after it from last years fest at BG. Warm, sticky day, D/a around 3000', no traction even with M/T da's, but a ton of fun nevertheless! :D

http://i17.photobucket.com/albums/b72/jalembo/th_JimboBurnout.jpg (http://s17.photobucket.com/albums/b72/jalembo/?action=view&current=JimboBurnout.flv)

http://i17.photobucket.com/albums/b72/jalembo/th_Jimbo117812408.jpg (http://s17.photobucket.com/albums/b72/jalembo/?action=view&current=Jimbo117812408.flv)

Lots of MPH, but the ETsucks because of a 1.9 60' time., When I get it down to a 1.5 that's when th fun will start!:bang:

Jimbo

Hey Jimbo, sorry I missed your call..my cell was in the bedroom. Dial me today during the day if you get a break from work..ph 904-264-5920. I will be slaving in the yard all day. If not I will call you tonight.

Nice shifts and vids !! That car will do a 1.5 sixty if mine will. It just took a little time to figure out the rpm to launch at.

I am shooting for next Wednesday night if the weather is good...or the following one...will try to get a vid if I can get one of my gang to go with me. There's not but about 4 of us left...they have all moved away. :bang:



Pit

Sorry for the ignorance Rob, but could you explain the chaulk trick in a little detail? We are all still trying to catch your record 60'ers. :drive:
Robert

Like Tracy said the line will help you determine how many rotations your rear wheels are spinning. With a stick car 1-3 rotations is about what you want.
It also will help show if the tire is spinning on the rim.(by marking the rim and tire).
If you have adjustable shocks you can also mark the shock and see how much travel you get or you can put some tape on the fender above the wheel to see how much the rear frame squats on the tire.

These are all things people do to dial in the suspension/launch.
Didn't pay much attention to this until recently as my 60' goals have changed.

With a good video(something I never get) you can play back in slow-mo and evaluate.

bob car sounds great and looks really good hopefully itll make it out to gainesville on the 7th

Thanks Rob, Blu and Tracy.

Pit

Damn Jimbo I remember car down there LOL! I think i have a pic of your car running down there. I remember being there and watching the racing that day. I had a red corvette you had to see it LMAO!!!

Pretty nice driving. Just a slight bit of nose drop. Do you log your runs? If so how long does it take for a shift? I know my shifts are pretty quick and use the logs in HPT to evalute the time it takes. Anyone else out there have their shift times figured out? So far my best 60'er has been a 1.51 and this year looking for that elusive 1.4x, which is a very short list of members, lol.
Robert

Man, you guys with these crazy 60' times blow me away,,,,I guess I need a slushbox...my 87 GN used to regularly do 1.35 60's, and it is a bolt-on car, no internal mods and a stock short block! If I could get a 1.5 short time, my car the way it is now should be running 10.5's. With the the new motor I hope to see low 10's IF I bring my A-game. I know I can shift, but the IRS and that tiny ring gear are just not what I'm used to. Hey Pit,,,,,go get 'em man!
Here's how you need to shift-----:

http://i17.photobucket.com/albums/b72/jalembo/th_Powershifting.jpg (http://s17.photobucket.com/albums/b72/jalembo/?action=view&current=Powershifting.flv)

Jimbo

bob car sounds great and looks really good hopefully itll make it out to gainesville on the 7th

did Doc get yours tuned friday night...ready for this wednesday night

(Pit)

Bob

Pretty nice driving. Just a slight bit of nose drop. Do you log your runs? If so how long does it take for a shift? I know my shifts are pretty quick and use the logs in HPT to evalute the time it takes. Anyone else out there have their shift times figured out? So far my best 60'er has been a 1.51 and this year looking for that elusive 1.4x, which is a very short list of members, lol.
Robert

Robert,
I don't have a copy of HP Tuners yet, but did log a run at Bandimere 2 summers ago with RalphP's copy. I had it somewhere on this PC, and if I find it, I'll post it up. I haven't had a chance to get a decent 60' with the drag pack on the car. 3.73 ring and pinion broke on the 1st launch with them.
Took 2 full teeth off the ring gear and tooth and a half off the pinion! :mad:
Car is all back together, but not going to track it again until I change out the motor and get the tune squared away. Went back to a 3.42 to go with the 418. I'll have 3.90's on standby in my spare diff if the 3.42's don't cut it.
And you're right, the guys with the 1.4 60's are few and far between! :nod:
That's great driving and having a strong car!

Jim

Robert,
I don't have a copy of HP Tuners yet, but did log a run at Bandimere 2 summers ago with RalphP's copy. I had it somewhere on this PC, and if I find it, I'll post it up. I haven't had a chance to get a decent 60' with the drag pack on the car. 3.73 ring and pinion broke on the 1st launch with them.
Took 2 full teeth off the ring gear and tooth and a half off the pinion! :mad:
Car is all back together, but not going to track it again until I change out the motor and get the tune squared away. Went back to a 3.42 to go with the 418. I'll have 3.90's on standby in my spare diff if the 3.42's don't cut it.
And you're right, the guys with the 1.4 60's are few and far between! :nod:
That's great driving and having a strong car!

Jim

Jimbo,
nothing to a 1.4 sixty foot !! Just hold the gas to the floor like a RICER..let it bounce off the rev limiter about 10 times and side step the clutch...o-yeah, and put about 8 psi in the slicks hot...LOL...:D That's what Nicholbag does to yank the front wheels off the ground (plus the big chick in the trunk) !!

Pit

Jimbo,
nothing to a 1.4 sixty foot !! Just hold the gas to the floor like a RICER..let it bounce off the rev limiter about 10 times and side step the clutch...o-yeah, and put about 8 psi in the slicks hot...LOL...:D That's what Nicholbag does to yank the front wheels off the ground (plus the big chick in the trunk) !!

Pit


That is too funny about the big chick in the trunk..............:D

That is too funny about the big chick in the trunk..............:D

Hey Allngn, have you had that bad-boy to the track yet ? Your 490/445 Almost matches my numbers.

Pit

did Doc get yours tuned friday night...ready for this wednesday night

(Pit)

Bob

yup my o2s are dying so i gotta pick some up tonight and put them in and ill be out wensday

yup my o2s are dying so i gotta pick some up tonight and put them in and ill be out wensday

Cool...I should be there about 6 pm...we are running a little late because Kyle has school till 4:20 pm.

Bob (pit)

Cool...I should be there about 6 pm...we are running a little late because Kyle has school till 4:20 pm.

Bob (pit)

We are tryin to be there wednesday, should be a good time :)

We are tryin to be there wednesday, should be a good time :)

Great..don't forget the skinnies !! :D

...gotta shake off a lot of rust though..haven't been to the track since around August of last year...pretty sad huh ?? Plan is to work on my sixty foot and shifting before I worry about ET because I will get the BOOT for running under 11.5 anyway. Gonna work out the bugs then make a blast for ET & MPH when things are right.

Bad part about Gainesville is you may only get 2 runs on some nights..you can't even get your tire pressure right that quick...let alone launch rpm on a new motor and clutch. This may take several trips or a track rental to get the full potential out of this 383 Z.

Pit

Pitt I take offense to the big chick in the back comment! Thats all I need to hear that Nickolbags car can run 11.20's with a fat chick in the back and I dont have a fat chick in mine :( DAMN weight savings mods.

Good luck and the track and dont bother being gentle on here GIVER HELL! Dont come home with a 11.0x completely unacceptable!

Pitt I take offense to the big chick in the back comment! Thats all I need to hear that Nickolbags car can run 11.20's with a fat chick in the back and I dont have a fat chick in mine :( DAMN weight savings mods.

Good luck and the track and dont bother being gentle on here GIVER HELL! Dont come home with a 11.0x completely unacceptable!

Thanks Bruce,
it might take me a few days to post a vid...just changed hard drives on my computer and the damn software won't reload..telling me my SN is invalid. Need to call the company probably for tech help.

What is that GENTLE word you speak of ??? I am....going to drop my launch down from 6800 to about 5000 just to start..that should still jolt me a little with the twin disk !! :D

My goal is the 6 something 1/8 mile and at least a 1.5 sixty foot...if I don't see that... :bang:

Pit

No good numbers to post guys...the car had nothing in it tonight, I guess from the heat ? It was 81 degrees with 50% humidity. My trap speed was 1 mph slower than the stock bottom end...it just had no pull over 5000 rpm
http://i160.photobucket.com/albums/t176/SportSide/DSC_3945.jpg


It took me 3 runs to figure the clutch and tire pressure..not too bad there.

1.669 sixty - 11.287 @124.55 mph eighth = 7.269 @ 97.84 mph 14 psi cold
1.733 sixty - 11.323 @ 123.5 mph eighth = 7.285 @ 99.06 mph 14 psi hot

Then Got flagged for no roll bar...kept tires at 14 psi hot

1.573 sixty - 12.62 @ 58 mph (on the brakes), eighth = 7.171 @ 97.07 mph
http://i160.photobucket.com/albums/t176/SportSide/DSC_3970.jpg

1.584 sixty - 11.495 @ 91.24 mph (on the brakes) eighth = 7.152 @ 96.4 mph
http://i160.photobucket.com/albums/t176/SportSide/DSC_3957.jpg

I was slowly increasing my launch rpm..first was 4000, 4200, 4500, 4800..then 5000...Then..I Broke the hardened half shaft...had to drag it on the trailer with my tail between my legs after one hour of racing. I had just lowered the tire pressure to 13, because she was spinning at 14 (bad luck tire pressure #..usually run 11.5-12.0) I was really feeling some 1.4 sixtys coming. New twin McLeod Clutch was doing great. If I could have gone down some in tire pressure...I was there. I was still spinning on my 1.5 sixty's. I have a vid of my first 2 runs but can't down load yet. Have to reload the software on my new hard drive and it won't accept the SN

Pit

Finally got the program loaded and uploaded the vids :bang:

Here was the first run with a light burnout and 14 psi in the ET Streets..about 4000 rpm launch. I was afraid to heat the tires too much till I saw what the twin McLeod clutch was going to do. The clutch hits really hard, not very easy to slip at all.
http://s160.photobucket.com/albums/t176/SportSide/?action=view&current=Run1-383.flv

Second run was light burnout again...14 psi hot. Upped the rpm a little..clutch hit hard again. All the launches felt good, but I still had spin till the fatal fifth attempt with 13 psi hot and 5000 rpm. The thing is...it was probably going to break soon no matter what rpm. This run I short shifted the 1-2 and you can hear me hit the limiter on 3-4. The limiter must have been set about 6800...I had it at 7200 on the old motor and didn't even think to check it.

http://s160.photobucket.com/albums/t176/SportSide/?action=view&current=Run2-383.flv

Pit

Well sounds like a good start minus the the half shaft!!! That really sucks, I had to edit this cause i didnt read the whole thing. Man that really sucks!!!!!!! You'll get it man, you'll get it. While its in for the half shaft get that bar!!!

Pit those runs look good. I like your approach to start conservative on the launch.
The 60's will come, you will have to make very small changes and seee what the car wants. If you can slip the clutch slightly more that would help. Maybe try and hold it just below the engagement point before release so it doesn't hit so hard.
Not bad for first time out in hot weather.
What tires?
R u runnin 17's? Your gonna need 16's with new setup/clutch!

Pit those runs look good. I like your approach to start conservative on the launch.
The 60's will come, you will have to make very small changes and seee what the car wants. If you can slip the clutch slightly more that would help. Maybe try and hold it just below the engagement point before release so it doesn't hit so hard.
Not bad for first time out in hot weather.
What tires?
R u runnin 17's? Your gonna need 16's with new setup/clutch!

Hey Rob,
yeah, thinking now I broke the ring gear the way it locks up when I try to roll it forward. Nothing specific happened..just held rpm at 5000, also had clutch right at engaugement point. If you watch # 2 vid closely..you will notice I did a shallow stage with rpm already holding and rolled very slow into it. The car actually never quit rolling while the lights came down. The Twin is just either engauged or it isn't...frickin hit's so hard. I think my normal 11.5 psi would have either brought a wheel off the ground or left the rear end on the track.
I have never enjoyed launching as much as that night. I had so much fun I wasn't even pissed when it broke. Now I'm pissed :bang:

Yes I am running 17" on ET Streets. You think I need the 16" huh ?

Did you notice my question on the other thread.. ?? Here is the question :

First absorb this :a 1.48 sixty foot with a 400 tq motor, single disk clutch and 390 gear.
What will happen to my sixty foot with a 435 tq motor, Twin disk clutch and a 373 gear ??

Thanks Rob,
Pit

I'll take a stab at the question. With 3.73's you'll be geared similar to my car with 4.10s but with 50ft lbs more torque. I say 1.46's are possible with just the right launch, tire pressure,track prep and air conditions! Now go! GO NOW!!! Make it happen grasshoppah!

I'll take a stab at the question. With 3.73's you'll be geared similar to my car with 4.10s but with 50ft lbs more torque. I say 1.46's are possible with just the right launch, tire pressure,track prep and air conditions! Now go! GO NOW!!! Make it happen grasshoppah!

Z, You said the right launch, psi, track pep and my air conditioner..AUHH-HA...thats why I was so slow..forgot to turn on the AC...LOL

Jacked up the rear, put in neutral and rotated the wheels..you can hear the loud clunk in the diff...also leaked a little fluid. May have cracked the case along with a chunk of the ring gear..sometimes it will turn a couple inches and some times a full rotation before it locks up. Sounds bad...but can't see yet..:bang:

Pit

Hey Rob,
yeah, thinking now I broke the ring gear the way it locks up when I try to roll it forward. Nothing specific happed..just held rpm at 5000, also had clutch right at engaugement point. If you watch # 2 vid closely..you will notice I did a shallow stage with rpm already holding and rolled very slow into it. The car actually never quit rolling while the lights came down. The Twin is just either engauged or it isn't...frickin hit's so hard. I think my normal 11.5 psi would have either brought a wheel off the ground or left the rear end on the track.
I have never enjoyed launching as much as that night. I had so much fun I wasn't even pissed when it broke. Now I'm pissed :bang:

Yes I am running 17" on ET Streets. You think I need the 16" huh ?

Did you notice my question on the other thread.. ?? Here is the question :

First absorb this :a 1.48 sixty foot with a 400 tq motor, single disk clutch and 390 gear.
What will happen to my sixty foot with a 435 tq motor, Twin disk clutch and a 373 gear ??

Thanks Rob,
Pit

Sorry pit!
Yeah, you need 16's for sure. May even be easier on parts. Your setup has mid-low 1.4's in it. You just need to figure how to do it routinely without breaking much.
You guys are fun to read about, makes my day.
Lets make sure we try and get together on Nov 16th@ Atco.
I bet Ernie will come up too. If we get enough cars I'll push for a 10.50 index.

Oh so its funny now that us pathetic low 11seconders can't even wink at coming close to your results :( Thats it i'm buying a neon!!!!!!!!!

Oh yeah...Another one bites the dust ...that makes your day..LOL ?? I guess you mean you enjoy the company..haha. I know you have had to break everything by now (except your stock bottom end ). Well, I even broke that ...in only a tenth of the time you have been trying...:D

The guy that replaces the most parts in the shortest amount of time WINS..

What about the 373 gear Rob...good or bad for me (I know you have tried that combo ). Sure do like the 390's in first and second ??

Pit

Oh yeah...Another one bites the dust ...that makes your day..LOL ?? I guess you mean you enjoy the company..haha. I know you have had to break everything by now (except your stock bottom end ). Well, I even broke that ...in only a tenth of the time you have been trying...:D

The guy that replaces the most parts in the shortest amount of time WINS..

What about the 373 gear Rob...good or bad for me (I know you have tried that combo ). Sure do like the 390's in first and second ??

Pit

I enjoy reading the the accomplishments and the effort you guys put in, the hardships come with it.
The best thing is that you guys lay it out there everytime, no pussyfootin' around. The video's are awesome too. Keep em' coming and have fun with it and the et's will come.
I would stick with 3.90 gears.
Get 16" tires please!

Oh yeah...Another one bites the dust ...that makes your day..LOL ?? I guess you mean you enjoy the company..haha. I know you have had to break everything by now (except your stock bottom end ). Well, I even broke that ...in only a tenth of the time you have been trying...:D

The guy that replaces the most parts in the shortest amount of time WINS..

What about the 373 gear Rob...good or bad for me (I know you have tried that combo ). Sure do like the 390's in first and second ??

Pit
Anyone else out there blow their LS6 @ 15000 miles, lol? If ya ain't breaking something your not going fast is my motto. :nod: Though I have been lucky with the gear box and rearend (just a stock shaft), we just try to make sure there is a little slip of the tires each pass.

Have you guys been putting your fast times up over at the Vetteforum?

Robert

no, I went 20,000 before I killed my LS6..You win that one Robt !! I was getting quite a bit of spin as I was still 2 psi higher than normal..didn't matter this time. That was a brand new RPS unit too..go figure !!

I did post my time last year on the cam\heads area. 11.33 under Pittman.

Pit

man Pitt, that sucks about your breakage. I don't understand how the clutch is "hitting hard" as you say, we have the same clutch and mine doesn't do anything like that. its very smooth and easy to modulate/slip.

I like to think of the clutch as a fuse to the driveline. if you can slip it and ride it out a little bit on the launch until your finally moving and the tires are hooked your doing good. what you don't want to do is dump the clutch at any RPM no matter what. you need to be able to tell exactly when the clutch starts to grab and thats where you want to leave your foot before you launch. this clutch is stong and can handle many hard launches but it needs to slip ever so slightly when launching so you don't send all the power/shock of the launch to the next weakest link in the drivetrain cause it ain't going to be the clutch that breaks, that sombich is beefy.

when I launch the car I like to remove all the slack in the driveline, here is how I do it. pull up to the tree and trip the first blub. once the first blub is triggered I put the clutch to the floor with the car in first gear and SLOWLY start to lift the clutch pedal until it creeps the car forward a little bit, THAT is your enguagement point. Once the car starts rolling forward enough to trip the second beam you push the clutch back in just a touch so its not enguaged anymore but also not released. Now you are fully staged and ready to launch, from there its just a matter of applying the correct amount of throttle while releasing the clutch pedal at the same time.

man Pitt, that sucks about your breakage. I don't understand how the clutch is "hitting hard" as you say, we have the same clutch and mine doesn't do anything like that. its very smooth and easy to modulate/slip.

I like to think of the clutch as a fuse to the driveline. if you can slip it and ride it out a little bit on the launch until your finally moving and the tires are hooked your doing good. what you don't want to do is dump the clutch at any RPM no matter what. you need to be able to tell exactly when the clutch starts to grab and thats where you want to leave your foot before you launch. this clutch is stong and can handle many hard launches but it needs to slip ever so slightly when launching so you don't send all the power/shock of the launch to the next weakest link in the drivetrain cause it ain't going to be the clutch that breaks, that sombich is beefy.

when I launch the car I like to remove all the slack in the driveline, here is how I do it. pull up to the tree and trip the first blub. once the first blub is triggered I put the clutch to the floor with the car in first gear and SLOWLY start to lift the clutch pedal until it creeps the car forward a little bit, THAT is your enguagement point. Once the car starts rolling forward enough to trip the second beam you push the clutch back in just a touch so its not enguaged anymore but also not released. Now you are fully staged and ready to launch, from there its just a matter of applying the correct amount of throttle while releasing the clutch pedal at the same time.

Thanks for the info Boost. Now for the prize question. Are you tellin me you pulled that 1.41 sixty foot easing the clutch out ? Holy crap !!!

Pit

Thanks for the info Boost. Now for the prize question. Are you tellin me you pulled that 1.41 sixty foot easing the clutch out ? Holy crap !!!

Pit
Yea man, let us in on the secret?
I do my launches a little different. I come from the J-Rod School of clutch dumps from hell, lol. Actually, it's just short of a full on dump. Getting close to 300 passes on stock gear box and rear end with Aussie clutch, so the effort to have a little tire spin has paid off, though may have cost me a 1.4x 60? Them damn rears are not cheap and many have gone through more than one so... Still looking to go 16" tire and wheel to help with torque absorption, but the 17" and ET Street have been great so far. I always start with my psi in the 10/12 range to help with wrinkle wall effect. Should have seen how close my rim came to contacting the roller at the dyno with my new 7xxrwtq, lol, at about 10psi.
Robert

no secrets here, anyone can do it... 10.5psi is what I shoot for.

one important thing is to dial the pressure in while hot. after a burnout and full pass get back to the pits and set your pressure were you want it. after every pass make sure to check it and adjust if needed.
also, make sure to keep your tire out of the sun if possible, it can throw off your pressures by a few psi which is huge. thats all common sense stuff, not like anyone didn't know it already, but little tricks like those add up on the big end.

Pitt I'm sure its been mentioned before but its worth repeating; you need to get a drag pack on that car!:nod:

no secrets here, anyone can do it... 10.5psi is what I shoot for.

one important thing is to dial the pressure in while hot. after a burnout and full pass get back to the pits and set your pressure were you want it. after every pass make sure to check it and adjust if needed.
also, make sure to keep your tire out of the sun if possible, it can throw off your pressures by a few psi which is huge. thats all common sense stuff, not like anyone didn't know it already, but little tricks like those add up on the big end.

Pitt I'm sure its been mentioned before but its worth repeating; you need to get a drag pack on that car!:nod:

Thanks Boost. Yeah I know, a DP would be nice if I could quit buying clutches, tranny's (and rear end & motor). :bang:

Man, you guys are killen me...10.5 psi...I was at 13 when she snapped. Gotta get in a few more "town" street miles ...maybe that will help out with the first gear slip I need !
I probably should just buy a Vette Shell..this thing just sits in the garage broke down most of the time anyway !! :mad:

Pit

Pittman, first off congrats on the numbers and new setup, it looks sick. I was wondering if you knew the reason for the dropped valve on the original motor? You break a valve spring? What springs where you running and can you list your cam specs on your original setup? Also, were you running stock valves or aftermarket ones?(for both your old and new setup) Sorry for all the questions, looks like you have one mean ride.

Pittman, first off congrats on the numbers and new setup, it looks sick. I was wondering if you knew the reason for the dropped valve on the original motor? You break a valve spring? What springs where you running and can you list your cam specs on your original setup? Also, were you running stock valves or aftermarket ones?(for both your old and new setup) Sorry for all the questions, looks like you have one mean ride.

Hey 1-8,
I will pm you the story and info tonight after work.
Pit

Awesome. Thank you

Heres a story... about a guy named Pittman and his dropped valve (please sing in giligan island format, it will be more humorous ;) )

Heres a story... about a guy named Pittman and his dropped valve (please sing in giligan island format, it will be more humorous ;) )

hEY-hEY -HEY....Thant is not funny Bruce !! You better go knock on some wood fast...lol

Pit

AlwaysInBoost can come out easier(less RPM and less aggressive clutch/throttle tecnique) because he is making so much more torque and hp at lower rpms. I bet he launches @ around 4000rpm. (i'm sure he'll chime in on this). It will be a different technique for you PIT, but trying different things will eventually allow you to find out what your car wants. Track prep and conditions also play a significant role in how one launches. That clutch you guys are running is a great piece. I know that a twin will feel/act slightly different on a S/C car with some serious hp/tq. You basically eliminate the dreaded spin bog with the s/c wheres the typical 450 h/c car needs to figure out a way to power thru the bog with a measely 400rwtq. The way to do this is to air up tires/or possibly lower launch rpm which is kindof counterintuitive. This will take time to figure out with your setup. It should be easier now that you have some more grunt/torque, but you will need to be fairly aggressive on the throttle during the launch. You will figure it out, just don't be afraid t experiment with tire pressure/launch rpm/launch tecnique and write it down so you know what you did last.
That clutch is good for a mid 1.45 in your car with elevate tire pressure(~15) and a 4800 rpm launch on a good track in an m6. That's why I would encourage you to keep the tire pressure up esp in the beginning to help prevent breakage while your figuring out the clutch. You can try bringing the pedal just below the engagement point (like AIB does) and see how the car reacts. It will cause the clutch to hit easier,less shock to the tires ,(in essence more slip). That may be a good balance to go with the extra tire pressure. To ge the low 1.4x's you can't have any bog which can be difficult to achieve. The advantage you have is the m12. As soon as I went to the m6 it took alot more finess to get the low 1.4x's but it's possible.
Remember when you figure out how to avoid bog, or spin-bog, you will be there.
I guarantee the sweet spot for your car/setup will be different than most everyone elses. By watchin' the vid's it proves you know what your doing and your very close.
Keep at it, I just wanted to give you some more food for thought.

Thanks Boost. Yeah I know, a DP would be nice if I could quit buying clutches, tranny's (and rear end & motor). :bang:

Man, you guys are killen me...10.5 psi...I was at 13 when she snapped. Gotta get in a few more "town" street miles ...maybe that will help out with the first gear slip I need !
I probably should just buy a Vette Shell..this thing just sits in the garage broke down most of the time anyway !! :mad:

Pit

Look at how an AT car launches, you don't have to nail the tires hard off the line. a lot of those AT guys are just rolling out of the hole off idle and still getting good 60's. I'll bet you can come off the clutch @ <2k RPM & pull an awesome 60' as long as you give it enough gas as to not bog. launching is all about being able to keep the nose up thru first gear and yet not lose traction.

also remember Pitt, if you spin off the line and THEN hookup you can still break parts. you want to avoid any sudden shock to the driveline. whether its from the initial launch, losing traction and all of a sudden finding it while still in the throttle or just shifting hard. traction WILL find the weak link in your setup. I've broken driveline parts on other cars just from losing traction and all of a sudden getting it back again. :bang: thats why, like I said in another post, I like to think of the clutch as a fuse for the driveline.
Learn to modulate that along with the gas pedal and your golden.

Thx for the info guys. I did start writing my launch rpm and psi on the back of eack time slip. I must admit..I'm going to be gun shy for awhile now (unless I get some spare case donations....anyone ??) !! I could have handled the ring gear, but the case cracking is gonna give me nightmares.

I will get back out there ASAP. The whole thrill to me is the launch, first and second gear..the rest is ho-humm waiting on the motor to wind up. That is why I love the m12\390 gear..no time to think..all just reaction.

I will keep you guys posted with results. I have had 2 years of bad clutchs..this McLeod may be the horse I need to ride !

Rob, here is a pic of 25 runs on a PRS Stage 4+....I had 400 rwt, not 1,000 !!!
Almost worn completly flat.
http://i160.photobucket.com/albums/t176/SportSide/DSC01280.jpg



Pit

Hey Pitt dont get discouraged!!!!!!! It could be worse you could've ran say 11.0x 12times now!!!!!! :( I have my stock 3.42 rear diff sitting in a plastic bag just incase something like this happens. I have a friend selling his 4.10 rear but that doesnt help you :( Theres gotta be a couple rears on CForums.

Bruce, That is crazy..11.0 - 12 times !! All you ever needed was a 10 mph tail wind !!

Yeah, I will start watching for a deal on a diff...I have seen them before.

Pit

Ok guys,
I had a little luck. My diff blowout was the ring\pinion and one side cover cracked. The fluid leak was from a blown seal. The ring gear had 3 large chunks out of it (about 5 teeth in each spot) and the pinion gear had 2 large hunks out of it. I do believe the DTE brace held it all together. I will Order some parts and get that puppy on the road soon !! :nod:

Pit

Here is a pic of the damage. It did eat the case inside a little but I can smooth it out and should be ok.
http://i160.photobucket.com/albums/t176/SportSide/DSC01291.jpg

Pit

Ouch. Sorry to hear. Are you doing your own diff build?

I broke my diff last week too and am looking into this.

Ouch. Sorry to hear. Are you doing your own diff build?

I broke my diff last week too and am looking into this.

RPM did the diff build but a friend @ EFI-Alchemy is fixing it.
Pit

RPM did the diff build but a friend @ EFI-Alchemy is fixing it.
Pit

Cool. Good luck!

Cool. Good luck!

Thanks.
Just ordered the 390 Cyro treated ring set. Supposed to hold up to 1,000 rwhp. Hopefully that 1,000 will add up to more force than a Mid 400 rwhp and McLeod Twin clamping down at 5-6000 rpm. :punch:

Pit