Hey guys im about to build a full ls vtec turbo motor. the block will be sleeved to 84mm and i was wondering whats the best compression ratio for this? I know i should run low but what numbers. What pistons should i get. Im not worryed about money i want the best.

 

The higher compression you run on a boosted motor, the more sensitive it will be to changing conditions. (outside temps, Intake air temps, timing, etc) You will make more power, with lower boost levels on a higher compression motor. It depends on how much power you're trying to make, usually daily driven cars should see between 9:1 and 10:1. I like CP and Wiseco pistons.