Yes another Compression Ratio Thread, searched.
02-07-2008, 11:06 PM
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Yes another Compression Ratio Thread, searched.
Hey guys,
Well i have spent the last hour or so readin through the archived Compression ratio threads for Turbo setups. I have pretty much made the conclusion that EVERY individual setup is different and depending on turbo size and HP goals compression should be chosen based on that. So With this setup in mind please direct me into the right compression ratio as well as bore for this setup.
Setup will be
Fully sleeved and Built GSR w/ some mild headwork. (stock GSR cam durations)
SC6152E turbo.
I will be running two tunes, one for Pump gas (93 octane in FL where im at) and one for C16.
On my pump gas tune im looking to achieve around 480whp tune at xxPsi and well in the 500's for my c16 tune at xxpsi.
Now this car will not be my daily driver but would like it to retain at least some driveable power outside of boost if need be. The car will be "beat" on a couple times a week so keep this in mind. Car will be tuned by Howard@ speed innovations so not worried about too much error in tuning, but any input would be great.
Also recommendation on pistons brand would be appreciated. Thanks guys
Well i have spent the last hour or so readin through the archived Compression ratio threads for Turbo setups. I have pretty much made the conclusion that EVERY individual setup is different and depending on turbo size and HP goals compression should be chosen based on that. So With this setup in mind please direct me into the right compression ratio as well as bore for this setup.
Setup will be
Fully sleeved and Built GSR w/ some mild headwork. (stock GSR cam durations)
SC6152E turbo.
I will be running two tunes, one for Pump gas (93 octane in FL where im at) and one for C16.
On my pump gas tune im looking to achieve around 480whp tune at xxPsi and well in the 500's for my c16 tune at xxpsi.
Now this car will not be my daily driver but would like it to retain at least some driveable power outside of boost if need be. The car will be "beat" on a couple times a week so keep this in mind. Car will be tuned by Howard@ speed innovations so not worried about too much error in tuning, but any input would be great.
Also recommendation on pistons brand would be appreciated. Thanks guys
02-08-2008, 06:03 AM
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Re: Yes another Compression Ratio Thread, searched. (Turbo-GSR1287)
8:1-8.5:1. Yes 8's compression. If you were looking for a more reasonable number on pump gas(say 400whp) I'd suggest 9:1. And something in the 300whp range, I'd suggest around 10:1. As for bore, going any less than 84mm would be stupid.
I'm sure someone is going to come in here, call me an idiot, and tell me their boy made 900whp on 91 pump gas when it was 150* out with 15:1 compression. Lower compression on pump gas won't make the car too much of a dog but it will give you a much higher margin of error which your wallet will appreciate vs going with a higher comp ratio and blowing the engine up. If you were using better fuel, I'd suggest a higher compression ratio. 93 octane pump gas, stick with lower compression if you want to make almost 500whp.
I'm sure someone is going to come in here, call me an idiot, and tell me their boy made 900whp on 91 pump gas when it was 150* out with 15:1 compression. Lower compression on pump gas won't make the car too much of a dog but it will give you a much higher margin of error which your wallet will appreciate vs going with a higher comp ratio and blowing the engine up. If you were using better fuel, I'd suggest a higher compression ratio. 93 octane pump gas, stick with lower compression if you want to make almost 500whp.
02-10-2008, 03:11 PM
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Re: Yes another Compression Ratio Thread, searched. (nowtype)
you got your answer in the first post:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nowtype »</TD></TR><TR><TD CLASS="quote">8:1-8.5:1.</TD></TR></TABLE>
thats about what i run and the car is NOT slugish at all, you just gotta give it more boost/timing and lean it out more...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nowtype »</TD></TR><TR><TD CLASS="quote">8:1-8.5:1.</TD></TR></TABLE>
thats about what i run and the car is NOT slugish at all, you just gotta give it more boost/timing and lean it out more...
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