Quote:
Originally posted by AzCivic
Yeah, I mean if everyone had access to 100+ octane race gas all the time then no one would care about compression. But we don't and for alot of us 91 is the best we can get, so this "compression doesnt matter" talk is confusing me. They say just make sure its tuned real good. Well what is involved in this tuning? Retarding the timing a grip and run octane booster all the time? And if it didn't matter then why do all the cars that come with forced induction from the factory run somewhere in the 8.5:1 range if not less.
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Stock Compression of 8:5 is an ideal compression for turbo. Also there is more to tuning then just retarding your timing. By getting a standalone and tuning it on a dyno machine you can actually recreate your fuel curve that best matches your setup. Which is alot of difference from stock ECU................. Let me briefly explain to you what compression is and how a turboed car is effected by compression. Say you have 10:1 compression. In NAturally aspirated car you would run 10:1 compression. Simple right? However once you are turboed and forcing air in their. Say one bar or 14.7 then once your air gets compressed in there your compression works like its almost doubled. IM not sure exactly what the formula is but you are running like 15-18 compression. As you know NA cars have higher compression. MOre compression means more horsepower. Blah Blah Blah.........