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Old 07-12-2007, 01:13 PM   #1
ajmodelski
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Default How much is too much Compression for a SuperCharger

I am considering getting a centrifugal super charger, but I want to know. How much Compression is too much for a pump gas car. I am going to be doing a PI swap, and my compressions will be around 10.2:1. And I would like to do around 9 PSI. But I want to know if that is too much compression with the super charger.
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Old 07-12-2007, 01:17 PM   #2
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Default RE: How much is too much Compression for a SuperCharger

With the right tune you'll be fine at 9 psi
Add an inter/aftercooler or meth injection http://www.mustangforums.com/m_3430620/tm.htm
I ran about 9psi for about a year with 10.5:1 compression with no probs
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Old 07-12-2007, 01:32 PM   #3
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Default RE: How much is too much Compression for a SuperCharger

What kind of power were you putting down at 10.5:1 and 9 PSI?
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Old 07-12-2007, 02:52 PM   #4
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Default RE: How much is too much Compression for a SuperCharger

If I remember correctly he was around 370ish rwhp... but im not sure how he built his motor... I know he had PI heads... thats all i know though...
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Old 07-12-2007, 04:21 PM   #5
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Default RE: How much is too much Compression for a SuperCharger

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What kind of power were you putting down at 10.5:1 and 9 PSI?
368 RWHP
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Old 07-12-2007, 05:06 PM   #6
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Default RE: How much is too much Compression for a SuperCharger

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ORIGINAL: Rusmisel01GT

If I remember correctly he was around 370ish rwhp... but im not sure how he built his motor... I know he had PI heads... thats all i know though...
wow good call! 368hp. pretty close!
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Old 07-12-2007, 05:10 PM   #7
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Default RE: How much is too much Compression for a SuperCharger

you can change your piston head design to help lower compression... wont be cheap though and they need to be forged
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Old 07-12-2007, 05:36 PM   #8
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Default RE: How much is too much Compression for a SuperCharger

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ORIGINAL: 2002GTAUTOVERT

you can change your piston head design to help lower compression... wont be cheap though and they need to be forged
Another way is to get Cometic headgaskets that are thicker to lower compression
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Old 07-12-2007, 06:17 PM   #9
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Default RE: How much is too much Compression for a SuperCharger

Well, if it is an issue to have that much compression I would just rebuild the bottom end all together. But, I was reading an article that said because of the lag and the way the Cetrifugals work, higher compression is not as bad as it is for a roots style or turbo set up. So I figured Id ask, as I have heard 9 to 1 compression is pretty high for Forced Induction, but I was wondering if anyone had any idea if 10 to 1 is too much.
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Old 07-12-2007, 07:23 PM   #10
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Default RE: How much is too much Compression for a SuperCharger

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ORIGINAL: ajmodelski

Well, if it is an issue to have that much compression I would just rebuild the bottom end all together. But, I was reading an article that said because of the lag and the way the Cetrifugals work, higher compression is not as bad as it is for a roots style or turbo set up. So I figured Id ask, as I have heard 9 to 1 compression is pretty high for Forced Induction, but I was wondering if anyone had any idea if 10 to 1 is too much.
Centri's do not lag! 9:1 is good for a centri setup, 8.5:1 for twin screw/Roots
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Old 07-12-2007, 07:23 PM
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