FPR in series Vs. FPR in parallel ??
 

It seems like everyone that has a FPR in they're 7 seems to put them in parallel, using the SX type FPR. I mean it seems very logical, both rails are getting the same pressure in real time.

Maybe its just me , but i never really heard of any one putting the Fpr in series, essentially just by replacing the stock FPR. WHY?

Are there really any disadvantages in putting the FPR in series for a car making no more than say 450hp? either way im still obtaining a desired pressure in my rails, correct? or am i missing something?

-Thanks

Most aftermarket FPR's are twin input and single output/bypass.&nbsp The parallel fuel rail systems is superior in terms of fuel delivery over the series system.

More info at...
http://fc3s-pro.com/TECH/MODS/FUEL/fpr.htm



-Ted

YAh, i ve seen your write up many times Ted and i have no doubt that it is superior, especially if your making crazy power. but whatta about for those staying under 400whp? is there any reason that a series FPR is less sufficent than one in parallel?

anyone have solid proof/test results, or first hand experience in setting up a FPR in series? I would love to here some feedback good or bad.

_aL

I did the paralel mod. Im running about 250-275 crank HP. I can tell my car runs a lot richer, even at stock fuel rail pressures. I have 550 and 760 cc injectors.

The greastest benefit is when using large injectors. When a 1600cc injector opens it causes a huge drop in pressure. If you have all these injectors opening and requiring a certain amount of flow, you may have problems with maintaining pressure or even backflow problems with the stock fuel delivery system.

The whole thing will cost you 300-500 bux. May I suggest the usage of AN8 fuel line instead of the AN6. 6 is not much larger than the stock, 5/16 inch hose. (6 is 6/16, which is 3/8)

I agree. Parallel is superior.

B

If you're not going crazy power, it's not necessary.&nbsp If you're on a budget, it's understandable.

It's not a matter of performance; it's more a matter of safety.


-Ted