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R32 GTSt problems

SLY33

By SLY33,
in Engines & Forced Induction

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SLY33 Mentor

SLY33

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posting for a mate,

after having FMIC, BOV, filter, and GTR fuel pump installed by Fussy's, the car is running like absolute crap.

its making NO power! Boost comes on real quick (11psi) but you feel NO pull, and it breaks down and pops out the exhaust etc etc, and just wont rev cleanly.

Ive considered things like coil packs etc and have done the usual check for leaks, cracked hoses etc etc and found everything looking fine.

just wondering who can recommend a good place in sydney to take it to for prob solving and a good dyno tune. Ive rang UAS but they are fully booked out, and Croydon's tuner is currently away.

or, if anyone thinks they know the prob or any tests i can do, please let me know.

(fussy's also did a service with oil and plugs but i dont think they did much by way of tuning as they have no dyno)

Also, The GTR32 Fuel pump installed is louder than my bosch 044 pump!! is this normal?

thanks for any help!

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SLY33 Mentor

SLY33

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i dont have anything to check the A:F, could be the prob.

def not the BOV leaking as i checked it (could see the valve closed as its a megasonic Tsmart and its wound in tight, and even put the stockie BOV back on.

why does a bigger pump make it richer? i understand it flows more fuel, but isnt pressure what its all about? it has std press reg.

When i took off my microtech making 200rwkw and put the std ecu back in to make 170'srwkw, still running the o44, it still ran as normal, no richer....?

any ideas on whos good to take it to?

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BHDave Grand Master

BHDave

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Just a few things you can check.

What type of filter has been installed and how much oil is on it?

Pull it off and check to see the AFM hasn't been coated in oil.

Then i would look at the fuel pump because it's very likely that it's running rich.

I have a 32gtst with pod, ic, exhaust and boost controller running up to 16psi on the stock fuel pump. Got an AF meter just incase but it sits in the full rich zone all the time when boosting so it isn't underfuelled (and this is the stock fuel system with no mods).

I'd also check your plugs and see if they are really black (and i mean REALLY black, slightly blackened is good), which will indicate very rich running.

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«Cyph3r» Experienced

«Cyph3r»

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Originally posted by BHDave

I'd also check your plugs and see if they are really black (and i mean REALLY black, slightly blackened is good), which will indicate very rich running. [/b]

Also when checking the plugs make sure they have the correct gap and that the temp range of the plug is suited to ur engine.

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R31Nismoid Grand Master

R31Nismoid

Posted
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Originally posted by Jay95R33

The GTR pump would help it run rich too.

J

How could the GTR pump affect anything?

Isnt the Fuel Reg there to control that?

I thought having a bigger pump does not mean more fuel is pumped into the motor.

But it could be a buggered fuel reg, and the car is over fueling.

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predator Grand Master

predator

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hmm.. to me though - wouldn't it be that if you have a slightly faulty pump, the fuel pressure isn't constant and thats the whole problem.. therefore while tuning on the old pump you'd try and dump more fuel in there to compensate at certain points (even if it was just appearing to fix the leaning out).. Then once a new pump is in, and everything is back to normal, you're still running the ratios for the old pump, which were actually overcompensating??? As a result its richer than it now needs to be?

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BHDave Grand Master

BHDave

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The stock computer will compensate slightly for a lazy pump when running around with a fairly stock car, it's when you start to max out the injector duty cycle that you start to see problems with the stock pump not maintaining fuel pressure and leaning out.

The problem with running a bigger pump is that the stock regulator/injector combination can't flow enough to maintain stock fuel pressure at idle and light throttle with the higher flow of the new pump.

Have you reset the computer? Just disconnect the battery and hold down the brake pedal for a few minutes with the igtition switched to on. Then reconnect and the computer will revert to it's base program and readjust to the new conditions. Simple, but I know it's fixed a few other peoples problems.

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