If you are sticking with stock injectors, you need to stay with a 12:1 FMU. If you don't, you risk going lean under boost and possibly blowing your engine up.
Mike D -------------------------------------------------------------------------------------------------
Originally posted by DR1665 You're welcome to all the beer you can drink, but you have to go get it yourself. Don't get pissy when we point to the fridge and tell you to get it yourself.
#99146, "RE: 10:1 FMU" In response to Reply # 2 Feb-12-07 03:09 PM by jack_of_trades
Actually, you only will need betwwen 90-95PSI at 6 pounds of boost with stock injectors. Even an 8:1 FMU would technically work but most people go with the 12:1 for 2 reasons: -faster ramp-up pressure for safer part throttle boosting -extra insurance against leaning out under full boost WOT pulls
A 12:1 will put you around 110-120PSI depending on your fuel systems condition (with stock FPR) which is more than you need of course. Just make sure to use Walbro 255lph GSS-342 'high pressure' fuel pump with the FMU setup or you wont be able to sustain such high fuel pressures. When you start to exceed 110PSI with the Walbro...you REALLY start losing fuel volume (i.e; you'll lean out the mixture and risk blowing the motor) so be careful how high your pressure is reaching.
Jamie- -AUTOMATIC turbo'd 95 Talon ESI@8psi (stock internals)14.0sec=1/4 mile
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