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Enabling Vct Rb25de Neo (r34)

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hi there

my r32 has a r34 rb25de neo installed in it.

this conversion was done using the r32 loom and ecu (previous engine in the r32 was a rb25de anyway so basically it was just replaced with a newer rb25de which has vct).

currently the vct is not hooked up.

i have the r34 loom and ecu available to me.

i want to enable the vct. what is the easiest way to do this?

i guess there are several options:

1. plug in the r34 ecu into the r32 loom and run the required wires from the ecu plugs to the vct system on the engine

2. replace the loom and ecu with the r34 items (probably the most labour intensive)

3. wire some sort of rpm switch for the vct.

another question would be: are the fuel/ignition maps on the r34 ecu better than the r32 ecu? i.e. will i make more power with the r34 ecu?


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Do the R32's have the boost solenoid hi/low function? You could hook up the VCT solenoid to that and it would trigger at >4000rpm...that's if they have that feature like the R33 and R34

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that would be a good idea, but the engine is a rb25de non turbo.

how does the vct solenoid get activated by the proper ecu? like does it get a signal to activate until a certain rpm where the signal is then removed and the solenoid disengages?


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  • 2 weeks later...
didnt want to create a new thread so heres a new question

will a r33 rb25de (with vct) ecu run the r34 rb25de?

and then:

what are the pinout differences between the r32 and r33 rb25de ecu's?


Series 2 ECU should, plugs are different though so you've need a patch harness.

R32 and R33 ECU's are the same except 2 injectors signals are on different pin locations I think....it's covered in one of the Power FC threads where people were converting R33 PFC's to work in R32's

best thing to do is look for the pinouts for the ECU's there are multiple sources for them on here

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