?? Turbo Boost and Compression

[LameHoof65]

I have read that when you go turbo, you should keep your compression somewhat low say around 8.5 or even lower? And also that camming up for a turbo can actually give you poorer performance regarding exhaust pulse and timing issues....is this true?? The reason is, I am seriously considering the turbocharging route....and it sounds like though I may spend more money in say forged vs. cast pistons and high performance valves...I won't have to worry about milling the head to that all important compression level necessary for other types of performance builds.. As well should I worry about getting the higher lift from say a 1.6 or 65 roller rocker setup?

 

[Anonymous]

Thats why it's so important to get the turbo matched to your motor. We all know what happens when your running a 8 to 1 compression motor with to big of a cam. It's real sluggish in the low and mid range. Try to find a dual patteren cam design with the exhaust duration and lift higher than the intake side. From what I've read this improves the spooling rate over the standard single patteren cam.

I've seen motors run down to 7 to 1 compression but they're running 20 to 25 lbs of boost. When useing forced induction on a motor with a higher static compression ratio the boost has to be limmited to below 10 lbs or so. I hope I answer your question... Later.

 

[Anonymous]

you could run 8:1 ratio and be safe under boost up to around 25psi. cams improve the spool time and reduce lag but as with n/a motors the bigger the cam the less low range. my recommendation? - 8.5:1-9:1 compression and a dual pattern cam. if your looking for low range just get a milder cam.