FPR under boost?
 

what happens to the fpr under boost? wouldn't it cause your car too run extreemely rich. what about other vacum dependent systems? thanx in advance guys

Re:FPR under boost?
 

even a NA car has 0vac under WOT. shouldnt affect them at all.

Re:FPR under boost?
 

i know that man i mean when the turbo is forcing air in your motor. obviously the entire system is the pressurized.

Re:FPR under boost?
 

it doesn't matter, when the boost kicks in all its going to do is close the FPR so that you get the most fuel you can. remember your forcing more air into the combustion chamber so you want more fuel to go along with it. you should use a stand alone fuel management system so you can properly tune the injector pulses and it will run great.

Re:FPR under boost?
 

The FPR will let the presure rise a little. It rises at a rate of 1:1 ( 1psi of boost = 1psi of addictional FP ). I have the $180 in car FP gauge in my car with the factory 92-95 FPR and it starts at about 38psi and stops at 45psi which is about right since I'm running around 6.5psi..

And no the FPR doesn't close all the way !!! My zex kit uses the factory FPR to up the fuel presure to 75-80ish psi when I hit the nitrous ( with the factory fuel pump too ).

Even N/A cars use the FPR to add fuel presure under acceration. Just not as much as FI cars do.