What do they do?
Do you need any other parts to go with them or does it replace the stock one if there is a stock one?
Benefits vs. Disadvantages (if any)?
Do you have to run premium fuel if you have one?
Do you need to replace your fuel injectors if you get one?
Are there mods you should have before you get one?
Will it improve gas mileage?

Saw them in an Import Tuner magazine article discussing general performance upgrades and was wondering if anybody had one and if it's worth getting one if you have a N/A setup, but have the basic bolt-ons.

Thanks in advance!

peace2u

 

all in all its not really worth it or necessary on n/a cars with stock injectors and bolt-ons...you can spend money better elsewhere

 

Wow, I can tell you know just about nothing about a FPR. I'll enlighten you a bit.

The fuel pump runs continuosly at its max speed, the FPR 'bleeds' off the excess pressure and regulates it according to how much the engine wants. It does this with the assistance of the vacuum that the engine produces. when the engine is at idle the vacuum is very high, so the FPR bleeds off a lot of pressure (the excess gets sent back to the gas tank). When the engine is running at high rpm or WOT the engine produces very little vacuum so the FPR lets the pressure stay high (essentially whatever the fuel pump is capable of producing).

No, most N/A cars don't need an aftermarket FPR, and you would only gain some fuel economy if your original one is bad. Testing the FPR requires a fuel press. guage, to test its WOT pressure and its idle pressure.

No, the type of fuel you are using has nothing to do with the FPR (unless its extreme like a methanol buring engine).
If you get an aftermarket FPR it would require a small adapter to connect it to the fuel rail.

 

@eric93SE & DA-MAX...

Thanks for the information guys. I saw one somewhere and it was going for a pretty reasonable price, so I figured I check and see if it was worth pursuing or not.

peace2u

 

if you're going turbo or S/C, or you're running bigger injectors, highly ported heads, etc... then you would need one..

but for a relatively stock engine, don't mess with it.

changing fuel pressure will affect your A/F ratio, as the higher pressure will cause the injectors to spray more fuel into the engine- given they're open the same amount of time as the lower pressure.
(think about the pressure on a water hose. more pressure= more water coming out)

If the ECU can't adjust far enough to compensate for higher fuel pressure, then you run the car too rich- and wind up burning up cats, horrible gas mileage, poor idle, carbon deposits, fouled plugs, etc etc etc.

low fuel pressure runs the car too lean... you burn up pistons and plugs that way.


Soooo, you should only be messing with your fuel pressure if you know what you're doing and have an engine that needs adjusting.

 

Now THAT'S why I come here for advice!

peace2u