thank you SFR
03-12-2002, 12:09 AM
#1
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Location: FILLMORE ca.
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thank you SFR
one week ago i shimmed my waste gate to try to hold boost.it worked well the boost went up to 2 bar and the car took off but it would slowly loose boost and drop to1.5 bar.i figured that i had not added enough shims so i put a restricter in the banjo bolt this helped but the boost still bled down.i called john at SPEED FORCE RACING and he ran me threw a bunch of tests well to get to the point im an idiot .the car was boosting to 25 pounds pegging the duty cycle to100% on a stock 951 with 170000 miles!!!he explained a stock waste gate cant hold boost by design. 
03-12-2002, 02:27 AM
#3
Race Director
Because somehow you've managed to have enough fuel for that boost level. It's not the boost, or combustion pressure that blows the headgasket. It's the knock & detonation from improper air-fuel ratios that develops the intense heat that burns through a headgasket. I know guys who are running 25psi in their car on stock engine innards on a daily basis. And they add nitrous on top of that for a little extra kick!
03-12-2002, 08:50 AM
#4
Nordschleife Master
superjet, it's not really the wastegate that is the issue, well it is one of the issues but the main issue is that the stock turbo can't flow enough @ high rpm's to maintain high boost levels.
03-17-2002, 12:54 AM
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If your going to stay with KKK stuff I would get a K27#8 rather than a #6 "quick spool" IMHO. I sent Danno copies of the dynojet charts of my past two non-stock turbo setups if your interested in seeing the real difference contact him and maybe he could post them for you.
Paul
Paul