Originally Posted by SparkieSRT6
I'm still wrestling with the decision to either have my spare pulley safely machined to 68 or 69mm or go slightly larger so that I can keep the option of adding a 178 crank pulley later on. Definately don't want to have to change fuel/pump/injectors/rail etc.?
thats the road your heading down. inc the boost and you have to compensate . the fuel issues were present whe grip started this endeavor and the ttm injectors w/ the sl55 fuel pump fixed it. now its a matter of tuning the excess fuel out and keeping the fuel were he needs it.
last week at the track he saw 25 psi boost and was still running pig rich!