I removed my ECU to do some electrical checks relating to the OMP. For the first time I notice some orange writing on the ECU's shell, like how junkyards mark parts they sell.

"91 Mazda RX7 A/TRANS"

So for the past five years that I've had this car...a manual car has been run by an auto ECU. Precisely what performance/economy issues does this cause?

(Very long story behind the car. Engine is not original. Biiiig splice bundle halfway up the harness to the engine from the firewall too. )

 

there isn't a different ecu for an automatic, so it won't cause any issue at all.

N350-18-880 is california non turbo coupe
N351-18-880 is federal non turbo coupe
N352-18-880 is california non turbo convertible
N353-18-880 is a federal non turbo convertible

 

oh...okay.

 

Err... You switched up CA and Federal NA coupes... Federal is N350, CA is N351.

 

you sure? i was looking in the parts fiche! wouldn't be the first time...

 

From the archives: https://www.rx7club.com/2nd-gen-archive-72/ecu-part-numbers-applications-873382/

N350 CA
N351 Federal

 

wow so the archive is actually right?

i'm looking at the parts catalog now, N350 is CA, N351 is federal....

 

Neat!

 

Wow.. That's bizarre.... Sorry about that!

I wonder why all the universal parts are N350 then... >_<

...Also it means I gave away two 351s super cheap... urg :/