R33 Gts-t Surging Problem

[JDSracing]

Hi,

I was wondering whether I can get some help diagnosing a surging problem.

Basically, the car isn't boosting properly, it stutters/surges when I put my foot flat to the floor after I've been driving it for a few minutes with an intake temperature of about 20 degrees at the air flow meter, all the way to 6000rpm - then it underboosts at 8 / 9 psi (but really hard) to rev limiter at 7000. However, if you stop and let it idle for about 5 minutes aand let the temperature get up to 40+ then it boosts harder than I've felt it do before, but the guage reads less boost than it should be running (set to 10 with a manual boost controller - but boosts around 8 / 9 psi).

My fuel effieciency is really bad as well at the moment, but I don't have any fuel leaks. (For those familiar with wakefield park raceway I was going through a 1/4 of a tank of petrol per 15 minutes track time). It also has weird idle surging as well, it bounces sometimes, from about 600 to 1400rpm.

The car has aftermarket pod filter, FMIC, BOV, boost controller, HKS PFC-CON (Piggyback computer) - that's all that I know about.

Any one had anything similiar to this? I am out of ideas.

Edited July 10, 2006 by JDSracing

[jap33]

yea mines very similar, mine runs better with warmer air then colder air. it overboosts at night, and runs beautifully during the warm days, my fuel consumption is not to impressive, (but then again i got a heavy foot). im putting in a power fc next week, hopfull when they tune it they will come along the problem.

but as far as fixing it, check your fuel filter, alot of the time they are completly clogged full of crap, theck your coilpacks (swap them around), sparkplugs (gap them, i find that mine run better at .7 rather then 1.0), if possible pull an afm off a mates car put it on your and see if it makes a difference.

[GTAAAH]

Yeh, run an ECU diagnostic over it to, to check that all the sensor's are going and check the o2 sensor (for fuel economy/possible running to lean/rich)