does any one know the compression ratio for the evo 7 motor? the reason i am asking is because my 7 only boosts up to 15-17 psi max. and a stock evo8 is aprox 20psi would a evo 8 wastegate be an up grade? or even an evo 8 turbo? or would it produce too muck boost for the evo 7 motor?
thanks
dan

 

I am pretty sure the Evo 7 engine is the same 8.8.1 compression ratio as the 8/9 us models. I see no reason why 20psi would not be safe aside from the fact your ecu is tuned for 97 oct if memory serves me. You might want to consider a flash if you are planning on turning up the boost.

Bryan

 

i was told that the evo 7 turbo was better than the 8 turbo because it has a titanium wheel and spools quicker is this correct?

 

That only applies to the RS turbo, the GSR turbo still uses the inconel exhaust wheel.

 

E7 workshop manual states 8.8

 

There made to run 95+ octane so hopefully you have some type of reflash for the gas over here. I run only Sunoco 93 octane and my boost is about 19-20psi with a reflash . Only the RS/RS2 have the titanium wheel but unfortunately we still have the small exhaust side.
Looks like the RS 7 turbo and a 10.5 exhaust side is what the evo6 TME turbo is.

 

yeah it has 8.8:1 compression ratio

 

thanks for the info everyone

 

bang for buck is the 10.5 exhaust side a good improvement on the 7?

 

quote!!


yeah pick up the 10.5 hotside, because with 9.8 and all and great supporting mods you dont having high boost after 5500-6000rpm! (for my experience!)

 

ok thanks for answering my questions everyone