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Feb 15, 2007 | 08:50 PM

blue racer c6

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Pro

Joined: Feb 2005

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boost

what is the rule of thumb for each pound of psi we add under boost. say we start out with 400 hp with no boost and take it to 5 psi and then to 10 psi and then to 15 psi what hp #,# would we see . tt/ sc just looking fo an averge.

Feb 15, 2007 | 08:59 PM

F1_SS

Burning Brakes

Joined: Sep 2004

Posts: 922

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From: Dallas TX

Too many variables.

Cam
Heads
Outside temp
IC
Meth
6spd
Auto
Size of turbo
Timing

Feb 15, 2007 | 09:00 PM

Phate

Racer

Joined: Apr 2002

Posts: 259

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From: Northridge CA

Quote:

Originally Posted by blue racer c6

Assuming the form of FI is in its efficient operating range a good rule of thumb is anywhere from 25-30rwhp per pound of intercooled boost.

Feb 15, 2007 | 10:27 PM

bowmanm98

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Posts: n/a

From Jim Bells Supercharged/Turbocharged Rules of Thumb:

~ 1 psi boost = 6.8% horsepower max (1/14.7 = 6.8%)

At 5lbs approx 536hp
10 lbs is near 672
15lbs would be 800hp at the flywheel approx.

You basically need 7lbs to get 500rwhp

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