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Old 02-24-2007, 11:25 PM   #11
Teruyume
 
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the theoratical ideal compression ratio after boost is 12~14:1
the stock engine is about 10.5 to 11:1 depend on ca or us or jp model.

if u have a 6psi of boost ur engine will be around 16:1 compression ratio. that will be increase of thermal efficiency, required intercooler. and low compression ratio. usually a 8:1 compression piston, will be able to work with a 8~12 PSI of boost. but still wut getting into your engine is about 14:1 compression ratio.

to get over that u will need reenforced con-rod and crank and probably cylinder sleeves.

so in conclusion:
if u want HP not just get more boost, i need to get ur engine to ideal compression ratio (NOT more boost = more HP)
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