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Old 03-09-2015, 02:33 PM   #1
Bildo

 
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High Compression Woes

So I recently added a set of PRC 255 heads to my car, along with Nitrous. I ordered the heads w/ 65cc chambers making my compression 11.4:1, I have decided to throw on a procharger, even with meth I suppose I will have to go back to my factory heads as the compression ratio is rather high for FI?
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Old 03-09-2015, 03:17 PM   #2
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No, if you have a good tuner it can be done. A high CR will narrow down your tuning window.
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Old 03-09-2015, 03:39 PM   #3
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11.4 isn't that bad. Just like Blake said, tuning window will be smaller, and it will take less timing, but totally doable.

Hell C7s are 11.5 and loving the boost.
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Old 03-09-2015, 05:39 PM   #4
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Exactly. I'm stock LS3 compression pushing 12psi
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Old 03-09-2015, 07:49 PM   #5
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Yeah I might just send the stock heads in to be ported and polished, and throw them back on and sell the PRC heads. I just ordered a D1SC stage II tuner kit....
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Old 03-10-2015, 03:24 PM   #6
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Stick a big cam on it
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Old 03-10-2015, 04:39 PM   #7
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Per Stevies point, static compression is just one thing, dynamic is another. You can have a cam that bleeds off compression, or one that makes it higher than you want.
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Old 03-10-2015, 04:42 PM   #8
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Depends on the cam. My personal car runs 11.5-1 on stock pistons. Planning 16lbs on it but I will have meth injection.
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Old 03-10-2015, 04:45 PM   #9
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high compression

I run 11.3 with 21 pounds of boost and 18 degrees of timing on a F1R setup that makes over 1000 RWHP. Running E85 and progressive METH injection
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Old 03-10-2015, 05:09 PM   #10
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You will be fine with a d1 and a good tuner
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Old 03-10-2015, 05:12 PM   #11
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Interestsing comments. I'm biulding another cat and it has a Stealth Ram with 10.8:1 compression and I'd like to add twin turbos and was wondering if my compression was to high.
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Old 03-10-2015, 05:38 PM   #12
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You could get thicker head gaskets but you will be fine with that blower
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