Fpr Vs Fmu

[95cobra50]

what the difference between the two. From what i get the do pretty much the same thing

 

[Killercanary]

They do act very much the same as tey increase fuel pressure by restricting the amount of fuel that is allowed to return to the tank, only the FMU uses a boost reference to raise full pressure by predetermined amounts via the disc that is in it, example 4:1, 6:1 etc meaning that for every 1 lb of boost it sees it will increase FP by 4, or 6 respectively. The FPR has a much smaller range of adjustment as it relies on vacuum and not boost to alter the FP, it is set to run its max pressure when vacuum is at its lowest (full throttle) and it runs at a decreased pressure when it is under vacuum.

 

[95cobra50]

will i need a adj. FPR since my s/c kit has a FMU?

 

[94GTLaserRC]

will i need a adj. FPR since my s/c kit has a FMU?

You dont "need" an AFPR...I have a stocker. As Paul said, the FMU is more to get the A/F in the "zone" and the AFPR is to "fine tune" the numbers.

If you have the FMU and Trex with your kit, you dont really have to have the AFPR..

RC