Series1 ECU on a Series2 engine

[alldus78]

Unless I missed something on the ecu pinout or I just got a bogus pinout. The series 1 Ecu would work on a series 2, right?

[matafied]

nOOOOOOOOOOOOOOOOOOOOOOOOOOO

[s13point5]

my series 1 ECU worked on my buddy's series 2 motor. although you could feel a flat spot in the power curve between 4500rpms and 5500 rpms when he was using my ECU. people said it was because mine is an automatic ECU but i dunno

[Darius]

How in the hell does an S1 ECU will run an S2 motor? The S1 ECU depends on an external ignitor chip which is on top of the S1 motor. The S2 motor doesn't have an external ignitor chip since it is in the S2 ECU. What is controlling spark??

[matafied]

It cant! lol you must have had a s2 ecu and didnt know it. The s2 ecu will work on s1 but not the other way around, but what do i know

[Darius]

It cant! lol you must have had a s2 ecu and didnt know it. The s2 ecu will work on s1 but not the other way around, but what do i know

That is 100% exactly what I was thinking.

[eh?]

That's not correct (theortically).Remember the pfc and aem ems will work with either with zero changes. The s2 ignitors are in each coil, not in the ecu. According to the wire schematic and wire diagram the s1 and s2 ignition circuit are wired similarly.The s1 and s2 maf curves in the ems and pfc are the same, so you can *assume* it's the same in the stock ecu. Only difference I know of is ignition dwell, for the pfc it's the same but the ems is different because I ***** about it :x .Dunno if someone has actually tried it though.

[s13point5]

i just started my motor which is a S1 motor with my s1 ECU a few nights ago (first time starting her actually. it was exciting lol). that same ECU was used for 3 months in my buddies car which has a S2 RB25DET so he could drive his around while i was working on my engine setup. this is what i saw and witnessed

i could be wrong tho guys. is there serial numbers on the ECUs i can check to see if my ecu is a S2 ecu? my swap was originally a automatic and when i picked up a motor someone had slapped a 5spd transmission on it so i could have a different ECU as well


Modified by s13point5 at 8:01 AM 10/23/2007

[eh?]

So that proves the theory is right

[matafied]

LOL the ignition drive chip in the ecu is what makes them different, I have taken the chip out of a bad s2 ecu and placed it in a good s1 and then used it on a s2 motor I was dispirit. All five s1 ecus I have had never worked in my s2 car, so it is possible that he has a s2 ecu that came with his motor set, the transistor drive is a whole lot beefier in the s1 than the s2, the s2 coils are also differnent to work in conjunction with the ignition drive chip

TAG, who's it?

Modified by matafied at 10:05 AM 10/23/2007
Modified by matafied at 10:05 AM 10/23/2007

[eh?]

Well I guess that's what controls ignition dwell. It still doesn't make sense why it's one way interchangable and why the pfc and ems will work with both.

[d356bud]

so what ur sayin is if he had a series 1 ignition setup he could run a series1 ecu

[matafied]

The s2 ecu will work for both also, just like pfc and ems. but the s1 ecu will not because of the differances.

and yes i would say its possible, as long as the igniter is wired in just like on the s1, but it would require you to re-pin the connectors

[s13point5]

just got off the phone with my buddy. he is actually running a S1 ecu on his S2 rb25det. he is the guy that borrowed mine. he bought a S1 ecu off ebay (he was running my ecu as he was waiting for his to arrive). and he said he has ran 3 different s1 ecus on his car (a few local boys were down and he borrowed their ECUs). and i think i remember him saying he ask mack from mckinney and mack said that he has had success with running s1 ecus on series 2 motors. no rewiring needed

[matafied]

i wished it worked for me, hmmm idk well, i just have never got it to work, Has anyone else had success with this???

[matafied]

Anyone

[Joe]

up for more info.

friend needs help. S2 engine, S1 ecu showed. having lots of problems with it running right.

[Coolwhip]

Hmm, my friend's S2 motor fried the his S2 ECU due to water damage. I took my S1 ECU slapped it on his S2 motor, and it fired up just fine, car ran just fine (actually better than before for some reason, though it had a hesitation problem before in High RPM).