Planning a build for a restrictive race class
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On The Tree
Joined: Apr 2008
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Planning a build for a restrictive race class I spun a couple bearings, so it's time to rebuild the LS1 in my 99 Z28.
I autocross in the SCCA's ESP class, which has pretty restrictive build rules. I can't change anything in the long block; the heads, cam, and rotating assembly all have to be stock. But anything from the air filter to the head's intake ports, and from the exhaust ports out is fair game.
The car dynoed 343 hp and 354 lb-ft with a UD pulley, tune, SLP air box, stock MAF, ported stock TB, LS6 intake, and QTP headers. Given the rule set I'm stuck with, is there any sense in changing any of those intake parts while the engine is out of the car?
EDIT: Actually, I can deck the heads by .010, but I'm not sure it's worth the trouble. Thoughts?
I autocross in the SCCA's ESP class, which has pretty restrictive build rules. I can't change anything in the long block; the heads, cam, and rotating assembly all have to be stock. But anything from the air filter to the head's intake ports, and from the exhaust ports out is fair game.
The car dynoed 343 hp and 354 lb-ft with a UD pulley, tune, SLP air box, stock MAF, ported stock TB, LS6 intake, and QTP headers. Given the rule set I'm stuck with, is there any sense in changing any of those intake parts while the engine is out of the car?
EDIT: Actually, I can deck the heads by .010, but I'm not sure it's worth the trouble. Thoughts?
Last edited by Mercutio; Jun 28, 2013 at 05:25 PM.
12 Second Club
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From: Bucks County, Pa.
Since you already have too much power within that class (especially for autocross use in a front weight biased, RWD car which has some problems putting down STOCK power, even with sticky Hoosier 315/30/17 gumballs at all four corners)), I would ONLY do things to help the longevity/reliability of your LS1, and put what you would have spent on that into whatever (very restrictive by E/SP rules as well, I KNOW 
) suspension/DIFF (T2R or otherwise)/wheel & tire/brakes/seating/weight reduction/etc. you can. 
) suspension/DIFF (T2R or otherwise)/wheel & tire/brakes/seating/weight reduction/etc. you can. Thread Starter
On The Tree
Joined: Apr 2008
Posts: 179
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Since you already have too much power within that class (especially for autocross use in a front weight biased, RWD car which has some problems putting down STOCK power, even with sticky Hoosier 315/30/17 gumballs at all four corners)), I would ONLY do things to help the longevity/reliability of your LS1, and put what you would have spent on that into whatever (very restrictive by E/SP rules as well, I KNOW ) suspension/DIFF (T2R or otherwise)/wheel & tire/brakes/seating/weight reduction/etc. you can.
) suspension/DIFF (T2R or otherwise)/wheel & tire/brakes/seating/weight reduction/etc. you can. I'd disagree that I have too much power for the class, or for the chassis. I'm not afraid of a little more.
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12 Second Club
Joined: Sep 2005
Posts: 4,273
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From: Bucks County, Pa.
One of the members over on frrax.com had contacted Quaife about making a run of high bias diffs for our 10 bolts, but he could not get the required amount of pre-paid commitments to get them to do the run.
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