I was looking into some FPR for our car and besides the options we have already specifically made for our cars, will the evo specific FPR kits fit ours as well? The only thing i can think of that would matter is the diameter on the inlet of the fuel rail right? So is it the same in our cars as the evo? Thanks in advance

 

Why do you think you need one?

ROAD/RACE

 

^The FPR is not needed for an N/A engine?i have one from A2 and have yet to put it on, just waiting on some parts so i can throw it all on.

 

FPR shouldn't be necessary unless you're really taxing the stock system.

 

I dunno if im really taxing the fuel system but i heard you can benifit from raising the pressure via the fpr. BTW engine mods include AEM CAI, P&P 4g93 IM, RRM V2 headers, 2.25" Exhaust, RRM Piggy v2, RRM pulley. I figured that i could use larger injectors along with a fpr to get more fuel in????

 

With these mods, go ahead.

 

I have same mods as SYKOU...but also a ported fuel rail.

 

There's no point in just adding more fuel unless you are actually running lean enough to be damaging the engine and reducing your power. Tuning is the key. If you just bolted on a FPR or installed bigger injectors you wouldn't notice much. At most you'd get a slightly smoother curve but at worst you could run very rich and just lose gobs of power. If you get a FPR you should be OK, but bigger injectors would need a tune to really get anything out of them.

 

i know the piggy causes it to run really lean when suddenly pressing the throttle. I was planning to get rid of this lag sort of speak. would just a fpr do the trick?? or maybe just the injectors??? I figured, larger injectors means increased fuel delivery, and raising the fuel pressure would mean the fuel would be more pressurized and it wouldn't lean out due to lack of it.

 

I would just get a bigger fuel rail. The lag isn't because of a lack of fuel persay, it's more because of a lack of fuel on demand, that is, when you suddenly go full throttle there isn't enough fuel behind the injectors to feed them momentarily.

 

^ if i got a fpr and raised the pressure along with a bored fuel rail that should solve my problem then? no need for injectors...Raising the pressure has a direct effect on the availability of the fuel when it is needed correct? Because the fuel amount is controlled by the injectors so the same amount of fuel would be going into the engine so same AFR and just increased fuel availability when needed....

 

Yeah fuel pressure will just mean there is more fuel being crammed into the rail so it'll help with availability. Your AFRs would stay the same as you said unless of course they are lean because of lack of available fuel (ie. the rail is empty when the injectors open).

 

i think i might try the FPR with the injectors and see how it runs, just cause i have em, and might as well see if it helps or not.

 

k i got a bored throttle body coming in and im planning on doing a MAS swap. was it a 501 swap or something like that? With the addition of the MAS i still wouldn't be running lean enough to need to upgrade injectors? I just have no idea how lean the AFR would be with the MAS swap.

 

any update on this? i just installed a stillen FPR the other night. some short tests concluded that almost all hesitation is now gone. the way that RRM claims it will go away with their bored fuel rail. although when i installed the rail, the throttle response was slightly better, the FPR has taken away nearly all hesitation and throttle response is amazing.
mods are as follows: AEM CAI, radiused TB, ported IM, RPW phenolic spacers, RRM fuel rail, RRM header, custom 2.5" DP, RRM test pipe, Magnaflow catback, WORKS lightweight flywheel, ACT clutch and pressure plate, Deyeme firm front mount, and Stillen FPR set at 44 psi.