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On my Super-Charged engine(which makes over a 1,000 Streetable RWH) my CR is 10.7-1 and I'm almost positive on the Turbo engines they stay at 10.7-1 also.I would talk with what they now call Tuners that work on the Super-Charged & Turbo engines.The Turbo & Super-Charged engines have come a long way in the last few years.




I can safely comment that turbo apps making 1,000 rwhp on pump 91-93 gas are not using 10.7:1 compression ratio unless they are adding meth or something like that.





Also, the OP, must decide what fuel he will want to run, to finalize compression, or be prepared to adjust things otherwise, like stated above.