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Do you need to upgrade the FPR when installing a larger fuel pump?
Moderators: IMOC Moderators, IMOC Committee Members
4) When should I replace my stock FPR?
If your stock fuel pump resistor pack is still in place, boost levels stay below 20psi, and you do not have a pump larger than the Supra Gen IV or Walbro 255, the stock FPR is fine.We sell the Aeromotive brand of regulators, but there are others out there as well that work just fine.
We also sell
"fitting kits" with each rail type to help you install these regulators in your car!
5) When should I abandon the stock Supply and Return Lines?
At around 450 whp, 880 cc/min or 85 lb/hr injectors start to run out of steam.As you go to a larger injector, you will not be able to supply them with just one Walbro 255 or one Supra Gen IV pump.
Thus, this is when more drastic customization is really required.
WolfKatz has plenty of ideas about how to go larger, just drop us a line!