compression ratio

[Pavlo]

Tunning is really important when it comes to boost and compression ratio. There are honda guys that have like 11:1 compression running boost in the 20s on 95 octane. But you can do that when you have lots of money and god like tunning skills. Good tunning and cooling plays really big factor on what compression can YOU run. The chart that fanatic posted will give you safe results with decent tunning and you won't blow anything up if you don't notice a problem in time (like wastegate staying closed for longer than needed).