Fuel Cut

[Fangz]

would any of u guys know what the factory fuel cut is set to in a r33 gtst? im using a factory ecu and wanting to know what the max psi i can run b4 the fuel cut comes in

thanks....

[Thunderbolt]

Fuel cut is usually caused by the AFM voltages maxxing out. You should be able to run a fair amount of boost without any problems, but usally there isn't any specific boost level that you can run as it will vary according to other mods.

[Coupe-This]

depends, it seems to be different for every car. depends on other mods and so forth, i know i set mine to 10psi and got it, car would jerk heaps when i planted it, then all of a sudden hit 10psi and scream. Tho i dont think there was any power gain

[cerci]

yea i think its different for every set up

10psi would jerk around than go...

12psi...no way lol major cut outs

so i put it back 2 standard it feels way quicker...until certain mods are made like power fc, fuel pump, tune

[Fangz]

i wanna run 12psi while im still usin the stock turbo but i dont want 2 fit a fuel cut defender im gonna buy a pwr fc in the near future, plus i hate disturbing harnesses

thanks 4 all your help guys

[The Mafia]

actually, it comes in at 12psi or more.

I wound mine back to 10psi, and it ran like a dream.

[benl1981]

Remember many gauges read 2psi difference and where R&R kicks in depends on intake mods and exhaust mods.

[siksII]

it really depends, on my car it cuts in at 9psi, but is ok on 7psi, but has a few mods

[Maxx]

my previous R33 fuel cut at 10.5psi

but i have seen other's boost up to 13psi without any probblem!

both stock ECU

[PlasticStan]

If we're talking about ecu fuel cut when afm reaches max voltage and injector duty cycle is above a certain limit, this feels VERY violent. When it happens the force is usually enough to push you foward quite a bit. (You wouldn't want it to happen if you're not wearing a seatbelt )It only happened to me once on my series 1 GTS-T, and that was when the boost controller decided to stop working, and it reached 1.1 bar before the ecu fuel cut stopped it. Nearly c*****d myself thinking something was busted, but it ran fine after that.

The other safety feature of rich and retard used to happen on mine as soon as boost went over 10psi, it would run very rich, causing the plugs to foul and I was getting the usual misfire above 4500rpm caused by the fouled plugs. Changed to PowerFC now and with the fueling sorted it feels like a completly different car, even though I still have stock turbo and injectors. Should be amazing once I fit the 555cc injectors and get the turbo highflowed

Edited November 18, 2005 by PlasticStan

[midnight]

the afm is not actually maxing out, they usually have abit more voltage to go.

so infact the boost cut can be raised yet still retained. which would be recommended if you were only just hitting cut, as if you blew the wastegate line off the turbo, and you hit infinite boost, it would still cut.