Originally Posted by Dylan O56
The FMU... What injectors can it handle?
The BEGI Adjustable Rising Rate Fuel Pressure Regulator (ARRFP not FMU...get your acronyms right NOOB!) can "handle" any size injectors you can stuff in the intake manifold...however your stock ECU probably won't be able to handle any injector over 300cc. The ARRFP is just a dumb, adjustable, pressure sensing device that increases fuel pressure X% for every Ylbs of boost.
FMUs/ARRFPs, "auxilary" fuel pumps, MSD ignition retards, O2 clamps et al are all just bullshit, bandaid approaches to engine/fuel management that will cause you nothing but grief and aggravation! I can guarantee that you will NEVER get your car to run smoothly from idle to full boost at WOT without hesitation and inconsistent fuel air ratios. If you want to turbocharge your Miata, do yourself a big favor and build/buy and install a Megasquirt system and practice your tuning skills on your stock NA motor before installing a turbo system.
If you shop smart and/or DIY build the Megaquirt you won't spend much more money than buying the all "bandaids" (aux fuel pump, ARRFP, boost retard & O2 clamp all add up quickly) and you'll have a very robust tuning system. You'll also need a wideband 02 setup....don't believe all the bs info BEGI provides with their ARRFPRs for tuning "with fuel pressure". Been there, done that, doesn't work consistently and a wideband readout of 14.0 AFR @ 8lbs of boost @ WOT isn't safe even if you are blasting 100psi of fuel pressure into stock injectors.
Just my .02.....but I think I can claim the dubious honor of "Bandaid King" with over 43K miles on a factory rebuilt Aerodyne (original puked on me in 3k miles due to prior owner's reliance of BEGI "tuning guidelines") BEGI 8psi intercooled "bandaid special"! It's ugly, please don't replicate what I've suffered with!