Is this ecu sutable for an rb25det?

[bibsteys]

hello i have a rb25 with a 20 harness and ecu the ecu is fried can i use a 2371021u70 mec r630 instead of an 2371004u01 mec r126? any help would be usful the ecu`s look diffrent inside if not wat other ecu`s can i use

[RSi]

They both seem to be RB20 numbers

You would want to remap it to suit the 25 properly.

[bibsteys]

but would the car start with the ecu?does the ecu being diffrent inside matter?the car was not running great before but it ran i just need the car to work any help is appreciated thanx

[RSi]

yeah i have idled my cars on many 20 ecus testing my work

I have a 25 chip for the 20 ecu if that helps you out....

[bibsteys]

yea the 20 ecu would be great is it for a s1 or an s2 the car has a series 2(it has 1 ignition module)

[RSi]

oh yeah i forgot about that. it ran on the 20 ecu?

[bibsteys]

oops i missread sorry yea the chip would be great but do you think were safe to try to start the car with this ecu? the car it came out of has igniter chips on each coil and the one i want to put it in has 1

[RSi]

worst case it wont start (i suspect thats the case)

I wouldnt boost on it?

[bibsteys]

thanks for the quick responces so in otherwords not a good idea to put that ecu on do u or anyone you know have a 20 ecu and we could put that chip in it? we need to get this car running asap

[RSi]

Just don't boost and you should be ok

I did the math once, and the mapping wasnt too far out

[Brendan]

A series 1 ECU will fry as soon as you crank it over on a series 2 ignition system. Been there, done that.

[RSi]

Not so. The 2 are interchangeable.

[bibsteys]

thank you very much! so who has an s2 ecu?

(thank you so much both of you)

[RSi]

S2 ecu wont like your R32 wiring

[Brendan]

Maybe it's only an R34 RB25 ignition system then, I had a Neo motor (similar to a S2) converted to R33 electronics and it would fry S1 ECUs all day but ran perfect on an S2 ECU. Fried a few ECUs before I figured out why.

I just re-red his post though:

yea the 20 ecu would be great is it for a s1 or an s2 the car has a series 2(it has 1 ignition module)

1 Ignition module meaning it has the ignitor chip on the back of the coil pack cover? That's a S1 motor.