Aftermarket Computer For Rb25 Conversion

[benjis32]

hi

i recently put an rb25 in my 32 and still have the rb20 computer in it the mechanic told me i need an aftermarket computer for it to run to its full potential and avoid stalling when stopping suddenly.

just wondering if the mechanic is talking crap and what computer would be the best for what i need.

thanks

benjis32

[blind_elk]

If your RB25 doesn't have VVT, then you can get the RB20 ECU re-programmed to suit.

Otherwise you will need something like a PFC, or Wolf make a plug'n'play unit for the R32. You can add in the wiring for the VVT stuff.

[R31Nismoid]

Car is stalling probably because of BOV or a related leak somewhere

if your using a stock turbo, you dont need an ECU upgrade

[benjis32]

If your RB25 doesn't have VVT, then you can get the RB20 ECU re-programmed to suit.

Otherwise you will need something like a PFC, or Wolf make a plug'n'play unit for the R32. You can add in the wiring for the VVT stuff.

what is vvt and how do i find out if it has it

[benjis32]

the mechanic said it was stalling because of the bigger injectors.

So it is still got fuel and no air when i go to stop.

and its ok when i dont stop suddenly.

[R31Nismoid]

Well if your running bigger injectors you dont have a stock ECU

A stock ECU wont run bigger injectors.

So i dont know how apples are making pears in this instance.

I think your being lead on

[benjis32]

he said the rb25 injectors are bigger than the rb20 injectors

stock rb25

Edited April 24, 2006 by benjis32

[blind_elk]

Well if your running bigger injectors you dont have a stock ECU

A stock ECU wont run bigger injectors.

Of course it will. All it's got to do is open and close the injector.

Problem is that the RB25 injector flows more fuel for the same opening time, so the engine is basically flooding.

VVT = Variable Valve Timing - look for a module on the front of the inlet cam, and a solenoid sticking out the side of the head (at the front).

[benjis32]

there is a gold coloured thing with a plug on the end of it but there is nothing plugged in to it.

Im not sure if this is what you are talking about but it's at the front left of the motor and it is sticking out of the head.

[R31Nismoid]

It will run them... but not in the driveable sense of the word if you ask me.

Side question... i think thee impedance is different too isnt it greg?

wouldnt that affect things?

[N I B]

That is the vvt and it will need an ECU upgrade.Wolf or R33 PFC will do your job.

[benjis32]

would i have to get 1 to suit an rb20 or one to suit an rb25

because it is an rb20 ecu.

thanks for all your help

[N I B]

Suit 25 so it can do the vvt,just need a bit of simple wiring.

[RedDrifter]

Ok if the rb20 ecu has not been toch and just let to run the RB25 then you will have some serious overfueling brobs indeed.

With the vvt you could get a revs activated unit from Jaycar and use that to turn on/off the vvt when required and then just get the stock Rb20DET ecu remapped to suit the larger injecors of the RB25. (270cc Vs 370cc)

Also to note is it is rumoued that the water temp sensor for the rb25 is different to the rb20 sneor so this would not help the stock rb20 ecu run correctly either. I guess some of the boys using The nissan fast software would be able to confirm that.

Just food for thought man.