Running Lean Full Throttle

[jiri styles]

just got my rb25 tuned the other day with the td06sl2 10cm, greddy copy, 440cc injectors, aftermarket throttle body, custom low mount steampipe manifold, full 3 inch exhaust, bosch 040 fuel pump.

Car made 268 hp on 15 psi and it started to lean out on full throttle.. and this is my problem now D:

tuner said tps could be and issue wiring wise, could bereading backwards or opposite or something..

mabey faulty fuel pressure reg? im running a sard fpr but i think it was faulty from the start so i am changing this, thoughts anyone?

[GTSBoy]

Fuel pump needs to be wired direct to a big fat 12V supply (fire fuse and relay of course). If stock wiring is in the circuit it could be underpeforming.

TPS comment from tuner sounds like bullshit.

[scotty nm35]

So you are running the 040? I have heard the mesh filter on the bottom blocks up restricting flow, I think some have cut the mesh out.

Definitely run a direct 12V feed from the battery through a fuse and relay, using thick wire as GTSBoy mentioned. There is a how to in the DIY section.

[jiri styles]

yep he also said to do the fuel pump thing as you guys are saying so i am going to start with that first because atm its just wired to the original pos and neg wires in the fuel tank and thats where im going wrong i think ..

Edited April 18, 2013 by jiri styles

[FordyR31]

Once thats done make sure the fuel pressure is checked to make sure everything, pump and regulator, are performing as they should. My last pump just wasnt doing the job up top, a pressure guage was hooked up to confirm it.

[jiri styles]

you have any idea what the fuel pressure should be on idle? and also on full throttle?

[GTSBoy]

It should be ~43psi at idle. At full throttle it should go up by about 14.7psi with no turbo, and 1 psi for every psi of boost above that.

[sonicz]

It should be ~43psi at idle. At full throttle it should go up by about 14.7psi with no turbo, and 1 psi for every psi of boost above that.

He needs to set the fuel pressure with the fpr vacuum hose detached right?