I got a b18b 94 ls engine in my eg coupe and im gona boost it but i have arias forged low compression pistons new and crower rods all new ready to be put in my car to handle more boost but i was wonderig should i put them in now if im jus gona run a fmu which i can only go 12lbs or should i jus go ahead and put the pistons and rods in anyways? because for me to go higher then 12 lbs of boost i need some kind of tuning right like uberdata or hondata?

 

Why build your engine then run a FMU? You need to state what size turbo your running, just get the better EMS. I know some people get results with a FMU but is not really the smart option. To answer your question 6psi

 

base your decision off of what you put down to the wheels, not psi...You could be running 5-9 psi on a motor and be putting down 250whp on both levels of boost.