402 with TFS 235's
09-20-2009, 09:13 PM
#141
TECH Regular
Join Date: Dec 2003
Location: Cherry Hill, New Jersey State
Posts: 486
Received 0 Likes
on
0 Posts
Big HP & TQ numbers from 402ci...
I'm impressed...
You made the right match combination with the parts...
You should be named Dr. +500 Hp
Congt.
The cam is costum grind as posed in early...
is it possible of having more details of the cam specification...
I'm confident you will do high 9's sec with new gear and slicks...
keep us posted...
I hope this thread is classified as sticky since it is a big millstone for the 402ci...
I'm impressed...
You made the right match combination with the parts...
You should be named Dr. +500 Hp
Congt.
The cam is costum grind as posed in early...
is it possible of having more details of the cam specification...
I'm confident you will do high 9's sec with new gear and slicks...
keep us posted...
I hope this thread is classified as sticky since it is a big millstone for the 402ci...
09-30-2009, 11:44 PM
#142
11 Second Club
iTrader: (15)
Join Date: Mar 2007
Location: So Cal
Posts: 772
Likes: 0
Received 0 Likes
on
0 Posts
Damn that car HOOKS AND BOOKS !!
I am truly impressed. I too went back to track. I hurt my clutch, started slipping bad after the 9th run in 4 hours.
I went 7.6xx @ nearly 96 mph with a personal best 1.9xx 60 ft time on Nitto Drs (555's) 305 35r18. They seem to hook best at 24 psi. Those zo6 gears and super sticky tires are making you a real track monster. I bet you were surprising quite a few people !!
Again very impressed, and thanks for the update.
I posted my numbers to show what the driver mod, gearing, and a killer 60 would do for my car. I'd probably see 7 flat in the 1/8 at 101 mph with Zach driving my car. Sorry for the hijack.
I am truly impressed. I too went back to track. I hurt my clutch, started slipping bad after the 9th run in 4 hours.
I went 7.6xx @ nearly 96 mph with a personal best 1.9xx 60 ft time on Nitto Drs (555's) 305 35r18. They seem to hook best at 24 psi. Those zo6 gears and super sticky tires are making you a real track monster. I bet you were surprising quite a few people !!
Again very impressed, and thanks for the update.
I posted my numbers to show what the driver mod, gearing, and a killer 60 would do for my car. I'd probably see 7 flat in the 1/8 at 101 mph with Zach driving my car. Sorry for the hijack.
I went from an 11.89 @ 121 w/a 2.0 60' on Nitto's to a 11.26 @ 123 w/a 1.64 60' only difference was I went with a 3.73 gear over a 3.42, added a TA and some very used MT ET streets.
This was at California Speedway which is known to have shitty 60's and MPH. The next week I was able to lower my 60' to a 1.59 at a better prepped 1/8 mile track. I got 3 runs...2 at 7.15 and 1 at 7.16 all at 98 mph. I'm hoping to hit 10's when I get 4.10's, new tires, remove my catt's and go to a better track.
With a tire and some good driving your car has 10's in it for sure, even at a shitty track
10-08-2009, 12:16 PM
#143
TECH Enthusiast
iTrader: (2)
Join Date: May 2009
Location: Iceland
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
I know that bro, I was just pointing out the 30 extra rwhp, better gearing (zo6 vs non zo6 tranny), 3.90's out back and added traction really add up to huge gains, especially in the 1/8th. I am happy as hell that I cut 3 tenths off my 60 and 4 tenths off my 1/4 mile ET. I thought 3 tenths off the 60 equated to a bigger reduction in the 1/4. More evidence my clutch was slipping.
I used to run 2004 Z06 whith mn12 and 3.42, i swapped all items to convertible body, but kept the vert tranny mn6.
and took better time. 11.42@121 1.67 60ft 1/8 7.33@96.8
but on the Z (less wheight) 11.52@122 60ft 1.67 1/8 7.4@97.3
I thinks it´s the better gearing in MN6 longer 1st, i was lunching at 4500-5000rpms both cars
the vert is a little bit heavyer... so..
So i think mn6 is better for 402 N/a setup...
the plan is getting 3.90 gears.
after i change fast
Baering
Iceland
10-11-2009, 08:38 AM
#144
Banned
Join Date: Mar 2009
Posts: 307
Likes: 0
Received 0 Likes
on
0 Posts
what is this vaccum pump?
10-11-2009, 10:14 PM
#146
TECH Apprentice
iTrader: (22)
Join Date: Jun 2006
Location: NM/FL
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
The vacuum pump creates a slight vacuum in the crankcase to help with blow-by pressures from loose piston rings. Low tension piston rings create a minimum of drag on the cylinder walls, but the low tension can also allow blow-by. You can use pistons with gas ports drilled into the pistons to put pressure behind the rings for sealing, but this is converse to the original intent. So, the use of a vacuum pump pulls out extra gasses from the crank case. Too much pressure in the crank case can act like an air spring and cause resistance. In my case, I sometimes blow out the dip stick about 6500 rpm. Thus, my pump is getting installed to avoid this. A good breather system can be used in place of the vacuum pump. But, when you are going after that n'th degree of power, you fine tune everything.
Check out GZMotorsports.com and Moroso.com.
I have 250cc intake runners and run 93 octane or E85.
Check out GZMotorsports.com and Moroso.com.
I have 250cc intake runners and run 93 octane or E85.
i, too, didn't know what it was until i read Gregory's post.
thanks Gregory!
10-20-2009, 05:35 PM
#147
A vaccum pump is a devise that is usually driven off of the engines front drive system and is plumbed into the valve covers to pull crank case pressure out of the crank case which aids in better ring sealing. It also aids in better oil drain back and combustion efficiency. 
Any new in breaking the 600 rwhp boundary!!!!
11-23-2009, 03:18 PM
#150
TECH Regular
Join Date: Dec 2003
Location: Cherry Hill, New Jersey State
Posts: 486
Received 0 Likes
on
0 Posts
The engine have the following menu, please correct me if I'm wrong:
- LS2 stroked to 402 ci with Lunati crank and rods.
- M6 Tranny.
- Trick Flow 235's milled by TEA & Ported intake.
- Manley pistons
- CR 12:1.
- Fast 90mm ported by TEA.
- TB NW 90mm DBW.
- Jesel Mohawk rocker arms (Jesel Pro J2K Series Shaft Rockers).
- GZ vacuum pump.
- 1 7/8" Kooks with 3 inch X Pipe into GHL catback.
- Custom cam, high 240s low 250s duration.
- C6 rearend (3.42 gear).
- 98 octane with timing at 28 degrees.
- Car weight around 3450 Ibs.
- SD tune with MAF removed.
- No EWP.
and it yeild 570rwhp & 509 rwtq...
If switched to Fast 102mm Intake Manifold & TB 102 upgraded, EWP, 3.90 gear, I think it will reach the 600 rwhp & 517 rwtq, this is my view...
If switched to Fast 102mm Intake Manifold & TB 102 upgraded, EWP, 3.90 gear, I think it will reach the 600 rwhp & 517 rwtq, this is my view...
11-24-2009, 06:45 AM
#153
TECH Senior Member
iTrader: (3)
Join Date: Apr 2006
Location: Western Burbs of Detroit
Posts: 6,524
Likes: 0
Received 1 Like
on
1 Post
Broke tranny, that sounds familiar. Sorry to hear about the break. Do you know what the failure was and what caused it?
I just suffered a broken tranny output shaft that torpedoed the rear end when it broke. One of the times when 2 birds with one stone is not a good thing. That was back in October, and then once it was fixed I ran into a broken rocker issue. Oh well its fixed now, just in time to put the car up for the year.
I'm sure you know when you make that power, things tend to break. Especially if you are getting on it. Was the tranny stock ?
I just suffered a broken tranny output shaft that torpedoed the rear end when it broke. One of the times when 2 birds with one stone is not a good thing. That was back in October, and then once it was fixed I ran into a broken rocker issue. Oh well its fixed now, just in time to put the car up for the year.
I'm sure you know when you make that power, things tend to break. Especially if you are getting on it. Was the tranny stock ?
11-24-2009, 11:05 AM
#154
TECH Regular
iTrader: (35)
Join Date: Oct 2005
Location: Salisbury, NC
Posts: 433
Likes: 0
Received 0 Likes
on
0 Posts
Broke tranny, that sounds familiar. Sorry to hear about the break. Do you know what the failure was and what caused it?
I just suffered a broken tranny output shaft that torpedoed the rear end when it broke. One of the times when 2 birds with one stone is not a good thing. That was back in October, and then once it was fixed I ran into a broken rocker issue. Oh well its fixed now, just in time to put the car up for the year.
I'm sure you know when you make that power, things tend to break. Especially if you are getting on it. Was the tranny stock ?
I just suffered a broken tranny output shaft that torpedoed the rear end when it broke. One of the times when 2 birds with one stone is not a good thing. That was back in October, and then once it was fixed I ran into a broken rocker issue. Oh well its fixed now, just in time to put the car up for the year.
I'm sure you know when you make that power, things tend to break. Especially if you are getting on it. Was the tranny stock ?
Failure was from tons of abuse on the dragstrip, etc. It had been built a few years back and was just completely worn out. I ended up finding a gear between 3rd and 5th on the track and it got stuck there, so we tore it apart and are getting it back to new.
Zach
11-28-2009, 02:43 PM
#158
TECH Regular
Join Date: Dec 2003
Location: Cherry Hill, New Jersey State
Posts: 486
Received 0 Likes
on
0 Posts
WWWAAAAAOOOOO
614rwhp & almost 500rwtq from 388ci
that is thy insane
is it street drive or pure drag racing...
Is it simple to handle this wild power when it push the throttle or no?
Can we hear about the combination if possible...
Honest, Congratulation...
11-28-2009, 02:48 PM
#159
TECH Regular
Join Date: Dec 2003
Location: Cherry Hill, New Jersey State
Posts: 486
Received 0 Likes
on
0 Posts
Is Your 388ci posted in a LS1tech thread? If yes, then can you please show the link
Thanks
11-28-2009, 04:59 PM
#160
TECH Enthusiast
iTrader: (5)
Join Date: Oct 2005
Location: Central, NJ
Posts: 741
Likes: 0
Received 0 Likes
on
0 Posts
Don't want to hijack the thread either.
Here is a link to the video.
https://ls1tech.com/forums/corvette-performance/1210024-388ci-c5z-video.html
You can see how docile the car is for it's et and the quality of the idle.
It is perfectly streetable. We have the idle @ 650rpms right now.
We run 100 octane for the drag strip.
The setup was just put together a few months ago.
After it is all dialed in I believe it will dyno ~700rwhp dynojet.