My TSP 396 Stroker missing HP
Originally Posted by Taphee6
Last LS1
You saw the car at the last RSD. It was the black WS6 Convert.
You saw the car at the last RSD. It was the black WS6 Convert.
I saw your car. I thought you got a race in there.
Anyhow, the 4400 lbs is a pretty close
3800 car
200 lbs driver (Yeah I can go on a diet)
120 lbs cage (steel)
65 lbs increase for the iron block
20 lbs increase in Torque arm
90 lbs gas (15 x 6 lbs per gallon)
Alright 4300 lbs
Anyhow, the 4400 lbs is a pretty close
3800 car
200 lbs driver (Yeah I can go on a diet)
120 lbs cage (steel)
65 lbs increase for the iron block
20 lbs increase in Torque arm
90 lbs gas (15 x 6 lbs per gallon)
Alright 4300 lbs
TECH Junkie
Joined: Aug 2002
Posts: 3,726
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From: Fort Collins, CO
You really should get your car on a scale so that you can know with 100% accuracy what the weight is.
As far as your missing power, change those Comp 'R' rockers out for stock rockers and see if you don't pick up some of that missing power. Those Mac Mid-Length headers probably aren't helping you too much either, especially because you're flowing a lot more air with this 395 CI Motor.
I'll bet that if you change out the rockers and put a nice set of longtube headers on you'll get almost all if not all of your power back.
Good luck and let us know how it turns out.
As far as your missing power, change those Comp 'R' rockers out for stock rockers and see if you don't pick up some of that missing power. Those Mac Mid-Length headers probably aren't helping you too much either, especially because you're flowing a lot more air with this 395 CI Motor.
I'll bet that if you change out the rockers and put a nice set of longtube headers on you'll get almost all if not all of your power back.
Good luck and let us know how it turns out.
Originally Posted by LASTLS1
No way he car weighs 4400 LBS! Recheck scale.
Not trying to get off of subject. Missing HP!
Launching!
Joined: Apr 2003
Posts: 230
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From: Florida
Originally Posted by MyLS1Hauls
Lets see the dyno graph...I want to see the rpm peaks. IMO, the heads are too small and so are the headers. What did the heads flow at .600"? I'd get some 1 7/8s LTs with true duals. The MACs are choking the motor at higher rpm.
You want the honest truth?
Sometimes dynos lie.
A buddy of mine has a heads/cam car. He's strapped it down several times, on different dynos. Consistently 400 +/- 5 horsepower.
He traps 122-124 mph. Nearly full weight (removed passenger & rear seat, swaybar, spare tire, and has skinnies/slicks - that's it for weight reduction). Has working A/C and everything.
I put down almost 460 rwhp. I weigh less. I trap about 125. Hmm.
Makes you wonder about yon dyno racing, eh?
As for a convertible weight, my 94Z weighed 3800 with me in it (~170). But that's bone stock with no extra 'stuff'. Take a little out for the LS1 vs LT1 difference, but add in all the extra stuff... I could see 4200 lbs... 4400 is stretching it tho, IMO. Still, much like my buddy's car, "something's weird".
Sometimes dynos lie.
A buddy of mine has a heads/cam car. He's strapped it down several times, on different dynos. Consistently 400 +/- 5 horsepower.
He traps 122-124 mph. Nearly full weight (removed passenger & rear seat, swaybar, spare tire, and has skinnies/slicks - that's it for weight reduction). Has working A/C and everything.
I put down almost 460 rwhp. I weigh less. I trap about 125. Hmm.
Makes you wonder about yon dyno racing, eh?
As for a convertible weight, my 94Z weighed 3800 with me in it (~170). But that's bone stock with no extra 'stuff'. Take a little out for the LS1 vs LT1 difference, but add in all the extra stuff... I could see 4200 lbs... 4400 is stretching it tho, IMO. Still, much like my buddy's car, "something's weird".
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Originally Posted by MyLS1Hauls
Lets see the dyno graph...I want to see the rpm peaks. IMO, the heads are too small and so are the headers. What did the heads flow at .600"? I'd get some 1 7/8s LTs with true duals. The MACs are choking the motor at higher rpm.
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Joined: Apr 2003
Posts: 230
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From: Florida
Originally Posted by Chris ARE 360
I have seen superstrokers dyno over 500RWHP through MACs. PAINs car did this at one point I believe. Unless there are MAC cats on the car and not an ORY I dont see the exhaust as being the main problem...
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
I believe same peak RWHP but picked up a bit down low. Can't remember though as it was a while ago (couple years ago)
Most guys that swich from MACs to LT's gain MAYBE 4-5 RWHP peak up top and a bit of torque down low.
Most guys that swich from MACs to LT's gain MAYBE 4-5 RWHP peak up top and a bit of torque down low.
Banned
Joined: Mar 2003
Posts: 603
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From: L.I. NY
I think your car weighs in the neighborhood of 4000 lbs raceweight. I don't know where you came up with 4400 lbs. My 98 Z weighed 3640 lbs with 2/3 tank and 200 lbs of me in it all stock. I'll give you 3800 lbs with you and a full tank in your convertible. Add your cage, iron block, tq arm and subtract a little for the converter and headers and like I said 4000 lbs tops. Gas weighs 7 lbs per gallon, but you can't just add it to the equation like that. Find a good scale and weigh the car.
Mac headers aren't all that bad folks, some really fast cars run them, albeit with an aftermarket ORY. Mids have been proven to beat LTs in several magazines, confounding even the editors of the mags.
Let's see the dyno sheet.
Mac headers aren't all that bad folks, some really fast cars run them, albeit with an aftermarket ORY. Mids have been proven to beat LTs in several magazines, confounding even the editors of the mags.
Let's see the dyno sheet.
TECH Fanatic
Joined: Nov 2001
Posts: 1,324
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From: Corona CA
Dude... If that weight is anywhere NEAR correct, you have WAY, WAY more than 390rwhp. Your MPH was similiar to mine when I was 3360lbs and 375rwhp (large DA though). So add nearly 100rwhp to move that extra 1000lb and allow for the A4 loss.
Tune on a dyno. Race on a track.
Tune on a dyno. Race on a track.
Originally Posted by Taphee6
Why go back to stock rockers vs Pro Mag? Also, I will get the car on a scale this weekend and post the weight.
Thanks guys
Thanks guys
I am trying to get to the track this weekend and I will scale the car. Based I the math from smokemup the motor should be putting down 444 hp. That would be right in line with expectations. The dyno sheet will have to wait till monday. I do not have it here. I will have it all posted by Monday AM. Thanks guys...
Originally Posted by Chris ARE 360
I have seen superstrokers dyno over 500RWHP through MACs. PAINs car did this at one point I believe. Unless there are MAC cats on the car and not an ORY I dont see the exhaust as being the main problem...
As for rocker arm stud flex, we're not talking about solid roller springs here. These springs are really not that stiff in the realm of things.
I got the car on the scale this weekend and it weighed 4153 lbs. I did not run very good times because of traction. Best time was a 12.40 at 115 with a 60' of 2.2. I will get the dyno sheet up Monday.
Thanks guys.
Thanks guys.
Originally Posted by Taphee6
I got the car on the scale this weekend and it weighed 4153 lbs. I did not run very good times because of traction. Best time was a 12.40 at 115 with a 60' of 2.2. I will get the dyno sheet up Monday.
Have you chceked your compression? Low compression could indicate that your valvetrain isn't set up as clean as you thought.
Ok, an iron block is 100 extra pounds and let's say you weigh in at 250 lbs, I still don't know where the last 400 lbs in your car is coming from.
Ok, an iron block is 100 extra pounds and let's say you weigh in at 250 lbs, I still don't know where the last 400 lbs in your car is coming from.
I hate to ask a stupid question but I have too. What is a neg DA? Also, the 4100 lbs was with me in the car. I totally agree that this car can not run a 11.90 with 390 HP on a street tire. According to the math the motor should be putting down 440 HP to run this kind of time with this kind of weight. there is another post on the this board with the same exact set up putting down 488 HP through a M6.