Rb20 Ecu On Rb25

[entelijint]

So I tried searching and turned up nothing.

I'm in the middle of my RB25 swap/build and am wondering if it's possible to use the RB20DET ECU with a series 2 RB25DET engine. the loom that came with the RB25 had the ecu connector cut off (they cut it at the firewall) and was wondering if I could just splice the rb20 end onto the rb25 without worrying much. I have both the rb20 and rb25 ecu, the pin-out on the rb25 one having 2 extra pins though.

I'll be using a MAP-ECU2 with this car... 550cc injectors, larger turbo, no maf, modified fuel pressure... so the tune will be completely custom.

anyways, long and short of it, can I get away with using the rb20 ecu with my rb25? if anybody knows, please explain what the issues would be if there are any.

[STATUS]

good bye VCT

[entelijint]

so i'm assuming the extra 2 pins on the rb25 connector and ecu control VCT?

[predator]

There's more than just 2 pins you will need to work around if you go this route ...

Get a pinout diagram of both the RB20det and RB25DET ecu's and you will be able to work out what needs to be changed to start with. Then a lot of the sensors are different and need to be wired differently as well.