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Configuring approx. compression ratio with added boost?

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Old 10-17-2008, 11:58 AM
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Default Configuring approx. compression ratio with added boost?
say you have a 12:1 motor and you want to add 7psi from a JRSC. Being that the JRSC would effectively raise the compression even more, is there are way to determine the approximate compression without an elaborate formula?

Do you think this would be possible on pump gas without the engine detonating its *** off? I've got pretty good control of the ignitionright now with Ectune (running approximately 28* at 7000 rpm) but added boost will definitely throw that off by a long shot.

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Old 10-17-2008, 12:15 PM
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Default Re: Configuring approx. compression ratio with added boost?
Depending on cams.. I doubt it. Cam duration and overlap has a lot to do with it. What kind of 12:1 build is it?
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Old 10-17-2008, 12:57 PM
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Default Re: Configuring approx. compression ratio with added boost?
h23vtec
f22 crank (balanced)
Crower 4340 rods (balanced)
wiseco pistons (balanced)

currently using a stock h22a head.
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Old 10-17-2008, 01:57 PM
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Default Re: Configuring approx. compression ratio with added boost?
i guess its all going to come down to trial and error.
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Old 10-17-2008, 02:25 PM
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Default Re: Configuring approx. compression ratio with added boost?
I predict 1 trial 1 error.
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Old 10-17-2008, 02:28 PM
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Default Re: Configuring approx. compression ratio with added boost?
good thing i have a back up block :P
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Old 10-17-2008, 02:37 PM
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Default Re: Configuring approx. compression ratio with added boost?
I hope you have backup pistons and head too :P
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Old 10-17-2008, 02:43 PM
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Default Re: Configuring approx. compression ratio with added boost?
Is there a cooler on the JRSC?
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Old 10-17-2008, 03:53 PM
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Default Re: Configuring approx. compression ratio with added boost?
Originally Posted by TorganFM
Is there a cooler on the JRSC?
No
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Old 10-17-2008, 05:24 PM
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Default Re: Configuring approx. compression ratio with added boost?
Originally Posted by 98vtec
h23vtec
f22 crank (balanced)
Crower 4340 rods (balanced)
wiseco pistons (balanced)

currently using a stock h22a head.
i hope you can tune really good 12.1 is alittle high for non intercooled boost with out a great tune
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