Rb25Det Ecu Upgrade

[Hterrygqt]

Gday all, quick question

I have a r34 gtt rb25det and just got a gt35 and hi mount manifold, do u need an aftermarket ecu or is the standard one ok? Its lightly modified, larger fuel pump, exhaust, coils, leads, big intercooler

[zebra]

do u need an aftermarket ecu or is the standard one ok?

700hp worth of turbo

yes, you need a tune.

whether that is simply a nistune board or a motec m880 is up to you

but now you will need bigger injectors etc or you will have a car slower than standard

[Hterrygqt]

Can i run it just on factory boost untill i buy new injectors and ecu?

[zebra]

maybe.

might have a shit fit, might blow up might be fine

[Hterrygqt]

Might blow up might not??

[zebra]

well...who knows how much more/less air a GT35 is flowing at 10psi compared to the little Hitachi the car came with.

might be running hugely lean at WOT.

if you just cruise around at low load/throttle I cant see there being a problem. give it the berries and expect to be looking though the for sale section for a new RB

[GTSBoy]

The compressor on the GT35 is MUCH bigger than the stocker. The turbine on the GT35 is MUCH bigger than the stocker. The wastegate actuator on the GT35 will NOT be set at the same 5-7 psi that the stocker is. So there is no way in hell that you will be able to successfully run that turbo on the standard ECU without wiring the wastegate open so you don't get any boost or being more disciplined in your right foot extension than most people are capable of.

Otherwise the advise of the above people is valid. You WILL need injectors and, assuming you keep the standard ECU and Nistune it, a Z32 AFM at minimum. You will also need a custom metal turbo intake (which should be obvious given the size difference between the stocker's inlet and the GT35's inlet).

Edited August 27, 2013 by GTSBoy

[SargeRX8]

Do it properly. You need bigger injectors a bigger maf a tuneable ecu a bigger fuel pump new dump a bigger cat and more than likely new coils and plugs. Open the wallet let it spill.