Pulley change = How much more boost?

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Dec 22, 2004 | 07:14 PM

MstgKillr

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From: Cape Coral, Florida

Pulley change = How much more boost?

I am thinking of changing to a smaller pulley, from a 4.0 to a 3.7. How much will this increase boost. Currently I have 9 psi at 6500 rpm. Mods in sig. I have the SDCE setup with a 7.25 crank pulley.

Dec 22, 2004 | 08:17 PM

frcefed98

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PM'ed you...I'm guessing 10.5-11psi going to the 3.7
J

Dec 23, 2004 | 07:47 AM

Cyborg

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I would guess about the same as what frcefed98 said

Dec 23, 2004 | 01:25 PM

BlwnTA

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typically .5-1 PSI (depending on DA and air temps) for each .100" drop in pulley size, so Forcefed is right on target.

Mark

Dec 23, 2004 | 04:55 PM

frcefed98

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Thanks guys

....God knows i've been through all the damn pulley sizes so far

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