My Gtst Doesnt Run Rich!

[J_R32]

Hey guys/gals,

Its seems that my R32 gtst auto doesnt seem to be running rich. the way i have come to this conclusion is that everytime i hit the gass hard, there is not one bit of black smoke that comes out of the exhaust. Do the same thing to every other standard computer turbo OR non turbo skyline and one will see some amount of black smoke which points to unburnt fuel. NOW..is the my car actuali running lean, as i cannot hear it ping when it on boost. Fuel pump fuel filter has being changed (funning r33 gtst fuel pump) and its stock except cat back exhaust and air pod. Can anyone tell me why my car is behaving like this? could the stock computer have being that smart and leaned out my fuel mixtures enuff yet ensure i aint pinging yet? surely not!

[Cubes]

So its running a NEW R33 GTST pump or a second hand r33 pump?

[Duncan]

Maybe a fuel pressure test may be the place to start?

[Kaido_RR]

Maybe a fuel pressure test may be the place to start?

<{POST_SNAPBACK}>

good idea

you can never really tell if ur pump is ok or not unless doing this test. and i say leaning out would be due to ur pump more than anything else in ur stock form

[rob82]

Check fuel flow should have at least 2.5l/min of flow at around 38-40psi of pressure. Also make sure the pressure increases when you pull the vacumm line to the FPR off. Also how does the car drive? If it is surging around cruise to medium trhottle it may be a build up of junk on the AFM sensing wire. This means you will be lean everywhere however the O2 sensor is probably adding fuel in, in its closed loop operation anyway.