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Old 12-15-2004, 01:37 AM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default What % of hp increase per psi of boost?

Is thre any way to figure this? Obviously low compression motors equal smaller % gains, but can go way up in PSI boost levels, while high compression motors have much bigger gain per psi, but cant climb as high without serious problems.

I am just trying to guestimate my hp at this stage, boosting the 2.2 1990 motor which has 9.5-1 compression, 6 psi at this stage, hopefully 8-9 psi by the time I dyno test this spring.

I normally estimate an increase of 7% per psi but this is for motors set up for boost, ie low compression motors. Just wondering if high compression motors give a noticeable increase % per psi of boost.
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Old 12-15-2004, 02:32 AM   #2
wrxpeed
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Location: in your mom's pants...and MN
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'03 Cobra DSG
SOLD '02 WRB WRX

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One main thing you need to remember is that PSI is just how much pressure of air is being pushed, not the amount. I think that CFM would have a much greater effect. Without knowing CFM of the air (volume), you really couldn't get a good figure.
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Old 12-16-2004, 01:15 AM   #3
IllNastyImpreza
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DIY project: life
I need more TIME!

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yea its really wierd...when someone asks you how much boost you are running, it means absolutly nothing. A vf22 running 15 lbs of boost is going to be a hell of alot more HP than a td04 (stock wrx turbo) running 20.
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Old 12-16-2004, 02:58 AM   #4
imprezilization
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lil advice: get somebody knows how to tune it, before u break it
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Old 12-16-2004, 03:02 AM   #5
subiekid
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1995 Legacy TURBO!!!
EJ22T/TEC3 & '12 Civic

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Hey red,

I was wondering if you had a picture of your injectors out of the car. I am still trying to compare the n/a reds to the turbo pinks.

Thanks,

Dustin
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