Standard Fuel Pressure Regulator for Turbo?

bark · Postby **bark** » Wed Nov 07, 2007 8:50 pm

I am now in the finishing stages of my turbo engine build and would like to now if I need to change my standard fuel pressure regulator which is situated next to the inlet manifold and the fuel line?

Will it still be able to pump the adequate amount of fuel required now that the engine is turbo and running 550cc injectors?

rjr666 · Postby **rjr666** » Wed Nov 07, 2007 8:55 pm

If you have upgraded your fuel pump you should have no worrys at all. I run a walbro 250 intank pump, gtr injectors and std fuel reg (3bar). 152rwkw and no fueling issues.

The only reason i know of to put a fuel reg on is to increase the pressure at the rail to pump more fuel thru the injectors.

Fatty · Postby **Fatty** » Wed Nov 07, 2007 9:03 pm

your fuel pressure should be fine with those big injectors, even on the standard fuel pump. by the way, how on earth are you going to get those massive things to idle smoothly? :shock:

i assume you are running an ecu of some sort? ?

bark · Postby **bark** » Wed Nov 07, 2007 9:15 pm

Thanks guys. Fatty I will be running a PNP Megasquirt.

Another question, what have you fed the front rocker cover (passenger side) breather pipe into? I know some people have fed it into the air intake pipe but some people have experienced issues with this as oil has leaked into it. Someone has suggested that I feed it into my oil return line. Comments and thoughts?

Fatty · Postby **Fatty** » Wed Nov 07, 2007 9:48 pm

i just feed minr into my intake pipe, as you described. so far so good.

pnp megasquirt, nice! mine will be running a megasquirt soon too (not the pnp version tho)

Fuzzlet · Postby **Fuzzlet** » Wed Nov 07, 2007 10:05 pm

On my old engine, I was able to make it idle smoothly with 550cc injectors, however it liked to run bloody rich though

Garry · Postby **Garry** » Thu Nov 08, 2007 9:21 am

I dont think it would be a good idea to put it into your oil return line. It should go into an oil catch can and then back into the intake system. The drain from the catch can could go back to the oil return if you didn't want to have to empty it periodically. The SP doesn't use a catch can and it's plumbed directly into the inlet pipe before the turbo and it seems to work fine. The intake gets nicely coated with oil mist though. At least it stops the intercooler pipes from rusting.

CT · Postby CT » Thu Nov 08, 2007 9:22 am

Personally I'd be ditching the OEM and installing a 1:1 adjustable pressure rising rate reg so you can accurately control your base pressure. I didn't notice but I assume you are running a returning rail fuel system? If so, rising rate reg should work well. My race car uses a Sard one and a mitsubishi adapter to fit onto the rail.

bark · Postby **bark** » Thu Nov 08, 2007 7:12 pm

Garry, thanks. Maybe I'll look into a catch as I want to avoid any oil getting into my air intake.

CT, I am just running the standard setup for fuel rail system. I'm thinking I won't need an adjustable pressure rising rate reg but perhaps I'll need one as you describe?? But I probably won't know this until I get the car on the dyno...

CT · Postby CT » Fri Nov 09, 2007 10:23 am

What model car is it?

NA 1.8 returning fuel rail -easy
NB8A returning fuel rail - easy
NB8B+ non returning fuel rail - a little more involved....

A 1:1 is a no brainer - ensures you always have correct fuel pressure to match boost - the stock one is a 1:1 - it's just not adjustable for base pressure.