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03-09-2015, 01:33 PM
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#1 |
     
Drives: 2012 2SS/RS LS3 Join Date: Dec 2011
Location: Omaha, Nebraska
Posts: 1,677
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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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03-09-2015, 02:17 PM
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#2 |
    
Drives: 2009 ZR1 Join Date: May 2010
Location: KCMO
Posts: 3,205
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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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03-09-2015, 02:39 PM
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#3 |
 Drives: 2006 Z06 Join Date: Oct 2010
Location: Gilbert, AZ
Posts: 5,712
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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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Nick
Corvette Z06 -1200ish rwhp |
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03-09-2015, 04:39 PM
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#4 |
 
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,019
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Exactly. I'm stock LS3 compression pushing 12psi
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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03-09-2015, 06:49 PM
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#5 |
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Drives: 2012 2SS/RS LS3 Join Date: Dec 2011
Location: Omaha, Nebraska
Posts: 1,677
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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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03-10-2015, 02:24 PM
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#6 |
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Drives: it changes Join Date: Nov 2010
Location: Norn Iron
Posts: 1,126
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Stick a big cam on it
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03-10-2015, 03:39 PM
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#7 |
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Drives: 2006 Z06 Join Date: Oct 2010
Location: Gilbert, AZ
Posts: 5,712
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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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Nick
Corvette Z06 -1200ish rwhp |
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03-10-2015, 03:42 PM
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#8 |
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Drives: 1999 Trans Am Join Date: Jul 2009
Location: Bridgewater,Ma
Posts: 2,017
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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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03-10-2015, 03:45 PM
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#9 |
Drives: 2019 Camaro Z-28 Join Date: Jul 2010
Location: Dallas
Posts: 1,484
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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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2019 SS 1LE BIG NA A10 Eagles Canyon Raceway 2.7 CCW Below https://youtu.be/c9M5UHDftcA 4-15-23 at SCCA TT U1 Class MEGA Thread on THIS car: https://www.camaro6.com/forums/showthread.php?t=602092 Retired Cars BELOW: 1973 Camaro, 1969 Camaro, 1969 Camaro SS RS 2010 Camaro SS with 1000HP F1R, 2019 ZL1 1LE A10 |
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03-10-2015, 04:09 PM
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#10 |
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Account Suspended
Drives: 2010 zr1 Camaro 2011 vert Join Date: Apr 2013
Location: everywhere
Posts: 1,121
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You will be fine with a d1 and a good tuner
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03-10-2015, 04:12 PM
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#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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Todd in Vancouver
'14 ZL1 Camaro '67 Camaro SS Pro-tour in process How hard can it be... Check out my other build http://www.pro-touring.com/threads/9...ject-Obsession  |
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03-10-2015, 04:38 PM
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#12 |
Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009
Location: Bowling Green, Ky
Posts: 3,355
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You could get thicker head gaskets but you will be fine with that blower
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