I know all that is needed to go passed a 75 shot On my wet NX kit is a fuel pump and colder spark plugs.

But is there a after market pump that wont afect my fuel pressure while running N/a?


-Chris

 

All pumps will NOT affect the stock fuel pressure unless you want them to. This is done via a FPR. You don't have to worry about that. The pump is there as a precaution to overtaxing the stocker which is rated @ 190lph, but that's barely. The 255lph Walbro unit is the best one and it will flow all the fuel you want WHEN you want to.

 

I got the 190 high flow pump and my idle fp went up a little from 33 to 35-37.

 

What do you mean when you say "WHEN you want it"

That running all motor it wont affect anything, and then when I run nitrous it kicks in by it self?


-Chris

 

The stocker is rated at 190lph.....I dunno about that. That's pretty beefy for an OEM. With 190lph, you can support up to 450hp NA.

 

So your saying dont waste my time and dont change it out ?

 

No, what he is saying is that the stock pump is not rated at 190 lph, iirc its more like just over 100.

If you buy the 190 lph Walbro Standard Pressure (not high pressure) pump you will have enough fuel to run well over 400 HP and will not overpower the stock fuel regulator.

Some folks have reported higher fuel pressure readings but I think most have purchased the high pressure pump which is not needed for the NX kit because it runs at stock fuel pressure.

The 255 lhp for NX its way overkill and will overpower your stock FPR. I have had both and thats my experience. For a dry kit or Turbo and S/C applications where the fuel pressure is boosted yes, but not for wet.

 

so is it worth upgrading to a WALBRO 255 for just stock use, n/a? i wnat to eventually go to turbo setup, or nos

 

With 255lph, you WILL NEED a fuel pressure regulator.

 

Jime,
I have a 190lph Walbro and my OEM fuel pressure regulator wasn't able to regulate the fuel pressure. I was getting 40psi at idle. I double checked it with a mechanical fuel pressure gauge.

 

Bottom line....Doesn't matter which Walbro fuel pump you get. YOU WILL NEED AN ADJUSTABLE FUEL PRESSURE REGULATOR.

 

Do you have the standard 190 or the High Pressure one? I had the standard and the fuel pressure remained the same.

 

I have the standard I believe. I didn't know Walbro offers a 190lph HP.