Rx7Sleeper

Ok i have a 88 GXL im pulling the Auto trans and swapping in a manual... But i wanted to know is it possible to leave the ECU from the auto trans in the car or do i have to swap the ECU from the manual car? both cars are 2nd gen S4 motors N/A... Is there ANY REASON I should cause if i have to i will but i want to know if i can avoid it cause theres so much labor involved already... Details and links are very appreciated. I will post swap details and pics when im done if anyone knows this...

Rx7Sleeper

OK ive found some info on ECU model numbers... N326 is in 86-87 Non turbo cars and in the 88 is a N327. seems like auto and man don't differ to me. the question id like to add is can i take a N327 and put my 86 manual trans and s4 motor with it? mind you the N327 came out of an auto 88... So im still lookin for answers for the first post and i'd like some input on the added details... ty

Akagis_White_Comet

Actually, N326 is for manuals and early automatics while N327 is for later S4 automatics. My 1987 GXL automatic (build date 11/11/1986) came with a N326 in it. Did an auto to manual swap without swapping ECUs or removing the transmission computer and it worked fine. The only thing that did not work was the Cruise Control as I wasn't in the mood to try and unplug the transmission computer under the dashboard on the passenger side. If you're under 5'5 and have small arms & hands, it probably isn't too bad. But if you're just shy of 6ft tall like me, it's a more difficult contortionist act. For all intents & purposes, there is no appreciable difference between a N326 and N327 ECU.

Traditionally, Mazda gives the first part number prefix of the set to manual cars, then adds 1 to the prefix to denote automatics. A good example of this is the radiator. A S4NA Manual one has a N326 prefix while the Automatic version begins with N327. The only exceptions to this rule are the GSL-SE (manual transmission only) and the JC Cosmo (automatic only). This system makes it much easier to look for parts specific to automatics such as the A/C fan since you can just scan through the prefixes and pick out the correct part number. All electrical parts use the following ECU prefixes.

N304: GSL-SE
N31x: JDM S4T2
N32x: S4NA
N33x: S4T2 (S4 Vert is N338)
N34x: Euro-Spec S4T2
N35x: S5NA
N36x: (Not Used, would have been euro-spec S5NA)
N37x: S5T2
N38x: Euro-Spec S5T2
N390: JC Cosmo 13B