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Old 02-20-2008, 09:50 PM   #21
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Originally Posted by radomirthegreat
So, is there also more boost on other W-bodies like aftermarket-supercharged Impala and Grand Prix cars?
Yes because of the U-bend. All W-Bodies have a U-bend, which was designed to protect the O2.
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Old 02-20-2008, 10:20 PM   #22
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Originally Posted by harofreak00
IMO, Regals tend to make more boost because there is more restriction in the exhaust because it has the u-bend. If you removed the u-bend, you would probably see the same boost that a stock Bonneville L67 has: 6-7 psi. It has nothing to do with the weight of the car.

Originally Posted by radomirthegreat
More boost is bad since that'* the pressure not doing much, right? If you were to start porting and polishing, you'd justifiably lose some boost. That is good, though. It'* all the more air actually moving through the engine.
Both posts right on the mark. The M90 spinning the same RPMs on all L67s were advertised @ 7psi stock. The inflated numbers are due to boost stacking. Lose the Ubend, give it a 3" DP and a nice free-flowing exhaust, and a 3.4 on a ported blower case will top out in 2nd @ around 10.5 -10.8psi ( that'* what I'm running, plus a Plog up front, and a ported rear still sitting on the bench.
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