thanks man :-)

 

Make sure to set the stock pressure with the vacuum line disconnected.

--Josh

 

why do you have to upgrade the fpr again?

 

So you can control fuel pressure?

 

Just to make sure you fully understand this....that's the MOST IMPORTANT little guy.

That is connected to your fuel pressure solenoid, or if you're not running one, your intake manifold. This port sees boost pressure while under boost, which is what raises your fuel pressure 1:1 with boost. If that line isn't hooked up or pops off under boost, you'll most likely blow your engine.


Eric

 

I went to a local performance shop and showed them the rail and the FPR and this is what they said to do. Will this work??

 

If you're running an aftermarket fuel rail with an open hole there, yes, that'll work just fine. What's on the end of your rail, to the left of the diagram? Is it just a dead end with no hole or fitting?

 

This is what I used to install mine. Pretty good set of instructions thanks to AMS.

http://www.amsperformance.com/instru...structions.pdf

 

Yeah Im getting a block off plate then. Thanks for all the help guys.

 

ok, better question might be why do you have to adjust fuel pressure? is it cheaper way to get a bit more out of your existing injectors or are there other uses as well?

 

For one reason, when you start upgrading to higher flowing pumps, they will overrun the stock regulator, causing high pressures and rich conditions at idle. So much so that your fuel trims may not be able to compensate.


Eric

 

is this ever an issue with walbro fuel pumps or does it start becoming a problem with high hp engines with double pump systems, etc?

 

mine was a problem with the walbro 255

 

Well, I haven't logged fuel pressure in my Evo...I did in my DSM years ago and I needed an adjustable FPR to control the pressure at idle with a Supra pump.

I think the Walbro will slightly overrun the Evo's stock FPR, too, but not too much that you need a new adjustable FPR. Fuel trims will take care of it. That and the dual fuel pump circuit in the Evo can handle larger pumps without the need to upgrade. Maybe someone has logged their fuel pressure with a stock FPR and Walbro on this forum for more definitive data.

The FPR overrun would only become a big issue with double pump and larger pump systems. But, it isn't bad to have control over your fuel pressure, nonetheless.


Eric

 

will soon find out if this will become a problem with walbro / 680cc injectors on Ecutek tune...