Boost Lee

iTrader: (3)

How does a higher flow (ie. Bosch or Walbro) fuel pump increase fuel pressure to the injectors if there is a fuel pressure regulator there to reduce it back down to stock levels?

I ask this because I am worried about fuel supply for my TII. I just cleared out the pre-cat, and I am quickly approaching the 8.6 psi fuel cut limit. I intend to get an FCD, but from what I understand that just prevents the ecu from cutting fuel. It doesn't ensure that the fuel supply will be enough to match the air supplied by the turbo. That is the situation that I'm trying to avoid by finding out why a fuel pump does anything if the stock FPR is still intact. Won't the fuel pressure still be the same, or are most people thinking that the stock FPR is too small to purge enough fuel from the rails resulting in higher pressure?

Please help!!

Turbonut

iTrader: (1)

I've always thought the same, but there is a philosophy among some that the higher fuel pressure will up the regulator pressure. My belief is to upgrade to longer injector cycles, therefore more fuel.

Boost Lee

iTrader: (3)

I'm thinking about just putting on an SX FPR and increasing the pressure that way.

Turbonut

iTrader: (1)

Old Question-More fuel, more fuel pressure. Does that equal more fuel into the engine without electronic upgrades?

Boost Lee

iTrader: (3)

It's a twist on that same question... the addendum is can you get more fuel if the pressure is regulated to stay the same even though the supply has been increased.

I think the answer is no. A new FPR is probably necessary.

Boost Lee

iTrader: (3)

no more help?

Pinfield357

iv asked this a few times myself but just as your finding out i never got a clear answer but if neone knows im still interested as well

T2 vert

iTrader: (5)

FYI: I installed the RP Competition Fuel Pump and using the stock pressure regulator my fuel pressure at idle went to 55psi. Stock pressure is 34 to 40psi. I was running so rich the car would bearly run. The stock regulator is too small to bypass all the fuel my pump is putting out. I am looking at getting the SX regulator.

jmseven

Get a good FPR. fLyiNgOuFeR has an SX FPR. His setup is mostly stock....runing low 12's

Boost Lee

iTrader: (3)

What physical location are you measuring the pressure from?

87racer

is there any stock pressure regulator on the 7's that has higher pressure? i mean, i have an SE, does like a GXL or GTU or even a TII have a better regulator? i just want to know if i can get a better one for my car without paying much at all since i dont have any huge mods yet.