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Will A S1 Rb25det Ecu Work On A S2 Rb25 Eng?

RB30 Ceffy
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RB30 Ceffy Enthusiast

RB30 Ceffy

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Posted (edited)

well I cant really see any differences in the S1 and S2 engine other than the coils. I figure an S1 ecu will work fine for a S2 engine. RB25DET. Anyone know if this should be cool?? Thanks :unsure:

Edited by RB30 Ceffy
RB30 Ceffy Enthusiast

RB30 Ceffy

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I've got a series 2 pfc in my s1 no problems I don't think it works the other way around due to the built in igniter required in s2.

Im pretty sure the ignitor is built into the coilpack itself for S2. Ive got the engine running on a RB25DE ecu right now and that has S1 coils and no VVT and it still drives and runs. Its just slow, doesnt know its boosted or vvt. Ive also herd of people converting S2 coils on theyre S1 engines and not changing the ECU. I just used it so I could make sure my wireing was correct. Also I thought the only difference between the RB20 MAF to the RB25 one is an extra ground in the RB20. They have the same maps im pretty sure aswell as S1-S2. If im wrong I would like to know but other than those two things is there any other way a S1 ECU would do my S2 engine any harm? Thanks for the fast reply guys :laugh:

2gceffy Rising Star

2gceffy

Posted
Posted

hey mate

i have a s2 ecu running my s1 engine, i havnt had any problems at all

assuming it would work as you stated the ignitor is in the coils not ecu.. cant really think of any differences that would affect it though.. its a gamble i guess

  • 4 years later...
  • 1 year later...
2FST4U.R33 Community Regular

2FST4U.R33

Posted
Posted

Is it possible to run the S2 motor with all the S1 wiring and ECU?

Transfer the S1 AFM, coils with top ignigter, TPS (throttle body?), O2 sensor? Also can the S2 CAS be modified or will the S1 CAS bolt up?

anyone know the answer?

Have a S1 RB25de with spun bottom end bearing and looking at putting S2 long motor in

Crazy Xav Collaborator

Crazy Xav

Posted
Posted

Is it possible to run the S2 motor with all the S1 wiring and ECU?

Transfer the S1 AFM, coils with top ignigter, TPS (throttle body?), O2 sensor? Also can the S2 CAS be modified or will the S1 CAS bolt up?

You certainly can, I put a S2 RB25 engine in my S1 R33 and used all the bolt ons from my old engine.

works no worries :)

Coolwhip1 Rookie

Coolwhip1

Posted
Posted

You can interchange the motors themselves (S1 and S2) without a problem. The differences lay within the wiring, throttle body, AFM, coils, and some later model O2 sensors (still wiring).

The ECU's do have their differences however, I've seen S2 motors run perfectly fine with S1 ECU's.

Hope that helps.

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