LS3 in a 2000 Camaro power numbers
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LS3 in a 2000 Camaro power numbers I installed an essentially stock LS3 (90mm throttle body, comp cams 269LRRHR13 cam, and 1-3/4 SLP LT headers) in my 2000 Camaro (auto trans, 3000 stall not locked during the run, with 12 bolt rear end 3.55 gear), tuned the car and now I have some questions for people who have this combination. It appears to be low on power to me but I want your opinions on the power and possible causes for the low power readings. The car put down 403 RWHP at 6100 and 370 is RWTQ at 4500 RPM. (I was expecting to see 430 RWHP based on similar cars with this engine combination) The tune is good, the intake manifold KPA during the run stayed at 99 KPA so no intake restriction, no knock retard and WOT timing was in the 28 degree range. I am suspecting the exhaust is too restrictive but I want another opinion. The 1-3/4 LT headers connect to a 3” y-pipe but the transition from the y-pipe to the 3” single exhaust drops down to 2-3/4 inches and then back to 3” with a flowmaster 3” muffler at the rear.
Any opinion on the power, possible exhaust restriction, or any other ideas?
FYI I locked the convertor on one run just to see what the difference was and it showed 421 RWHP.
Any opinion on the power, possible exhaust restriction, or any other ideas?
FYI I locked the convertor on one run just to see what the difference was and it showed 421 RWHP.
Thread Starter
Teching In
Joined: Nov 2011
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I will look into the exhaust restriction of the flowmaster.
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Thread Starter
Teching In
Joined: Nov 2011
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That Y-pipe at 2.75/3" is completely terrible. You could benefit from a 1.875 header but your current ones aren't killing you. I'd run custom 3" mandrel bends from the headers to at the minimum a 3.5" and preferably a 4" single. If funds allow search merge collectors an get one that goes dual 3" with a merge point pinch of 3.5" and then opens up to 4". Then run the single 4 at least to the rear axle before knocking it down to 3.5" for up/over clearance. Then a free flowing Magnaflow/Dynomax/or Hooker Aero chamber (cheapest straight through) would easily be worth another 30 or so flywheel and at least 20 rear wheel. The 425 ish unlocked will put you well into the mid elevens at near 120 mph...assuming good hook.
http://www.burnsstainless.com/mc2-300-16-ms.aspx
http://profabrication.com/productDet...5233_5436_5231
http://vibrantperformance.com/catalo...sort=2a&page=2
http://www.burnsstainless.com/mc2-300-16-ms.aspx
http://profabrication.com/productDet...5233_5436_5231
http://vibrantperformance.com/catalo...sort=2a&page=2
Last edited by A.R. Shale Targa; Apr 4, 2014 at 04:04 PM. Reason: links added
Thread Starter
Teching In
Joined: Nov 2011
Posts: 18
Likes: 0
That Y-pipe at 2.75/3" is completely terrible. You could benefit from a 1.875 header but your current ones arn't killing you. I'd run custom 3" mandrel bends from the headers to at the minimum a 3.5" and preferably a 4" single. If funds allow search merge collectors an get one that goes dual 3" with a merge point pinch of 3.5" and then opens up to 4". Then run the single 4 at least to the rear axle before knocking it down to 3.5" for up/over clearance. Then a free flowing Magnaflow/Dynomax/or Hooker Aero chamber (cheapest straight through) would easily be worth another 30 or so flywheel and at least 20 rear wheel. The 425 ish unlocked will put you well into the mid elevens at near 120 mph...assuming good hook.
I think with sticky tires and a cutout you will run a 11.4 or better. Stalled A4 through a 12 bolt on a mustang dyno is a recipe for disappointing numbers. But do not worry because what you have is an *** kicker setup street strip wise.
