Compression / Boost question

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Mar 21, 2006 | 06:50 AM

GoFaassttt

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From: Utah

Compression / Boost question

Is there a rule of thumb for how much boost must increase to compensate for lowering compression to maintain the same hp output?

Mar 21, 2006 | 05:34 PM

CaptKirk

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From: The HS that is NoVA

Not sure at all about this...nor is it meant to be accurate... but isn't it something like 2 psi per point of compression lowered?

Someone correct me if I'm wrong...

Mar 21, 2006 | 05:58 PM

evf2000

Joined: Jul 2002

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From: Arlington

Hmmm... I'm thinking more about 1 psi...or .8 psi to be exact. Might be wrong too. That's what I heard and witnessed to a degree.

Mar 22, 2006 | 10:41 AM

Spoolin

Joined: Mar 2003

Posts: 6,505

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From: Sellersburg, IN

I think efficiency of the engine plays a lot in this equation; but for the F20c, 1-1.5 psi increase in boost for every point in compression dropped is pretty close.