Fuel Pressure For R33 Gts-t Series 1

[coltco]

Hello,

I have a friend with a Nissan Skyline R33 GTS-t series 1.

The problem is that it doesn't run good, so we put it on a dyno and discovered it was running to lean under boost.

it runs around lambda 1 or AF 14.7 on boost, this should be around 11.5 i believe.

we checked timing and this is correct, changed lambda, fuel filter, ECU, AFM all this doesn't help.

Now we had a look at the fuel pressure this is around 2,5 bar (38 psi). i heared that this should be around 3 bar,is this correct.

Or should we look some where else

regards,

Sander Naberman

[Liz]

bumpidy i'd be interested to know as I'm having fuel pressure problems aswell

[Beer Baron]

base fuel pressure should be 40psi i think (from memory), plus boost of course. you need to make sure the boost feed for the reg is hooked up properly otherwise it will be running base pressure right through when it should be running base pressure + boost.

[BHDave]

36-38 psi (about 2.5 bar) with the vacuum to the reg removed, lower with it connected, higher under boost.

[J_Red33]

Hmm I've tested a lot of these injector rails in the past from various models & they've all been at about 3.75 bar with no vacuum. These injectors run under much higher pressure than most other types I've seen, usually 2.5 to 3 bar is normal with other types of injectors. I would think normally with vacuum it would be somewhere down around 3 bar of pressure.

[hijaked]

fuel pump or pressure regulator maybe?