FC3S S4 ECU options
 

Hi, i live in the UK and have an S4 Turbo FC3S which is a jap import and has an N340 ecu. No im trying to find out what ecu's are compatable. All the search options refer to S5, and US cars but there is very little info on UK and JAP spec S4 cars. I know the S4 turbo is rare, but there has been some info saying that N374 ecu's will work as they are a jap spec ecu?

The reason im asking is i have 2-3 'upgraded/chipped' N374 ecu's available, but i want to know whether they will work or not.

Any help would be appreciated,

Lee

you need a N333 or N332.
the 370 and 374 are S5 series and will not run an s4 based turbo car.

Ok thanks, so the N333 and N332 are for a Jap Spec car? I suppose i better get looking for 1 of those! My next question is, whats the main reason why S4 and S5 ecu's arent interchangeable? Is it the pin location/plug shape or is it the actual electronic design of the ecu regarding sensors etc?

Thanks,
Lee

The s5 engine has an electrical Oil metering system and other Stupid features!
They couldn't leave the old reliable mechanical system alone.

The S5 ecu goes into limp mode when that part fails,but the S4 is pretty well a Run good or doesn't run system..

Those numbers I gave you are for USDM engines.
here is a link that may help:
https://www.rx7club.com/2nd-gen-arch...ations-873382/

If you post in the European section you may get a answer or more info to any ECU questions.

A guy named Higgi(I don't think he would mind if you Private message him as he is always helpful) may be able to help you further.
He seems to know a lot about the electrical systems.

Thanks, yeah i know about the omp on both, but was just unsure on the ecu side. Yeah ive seen that thread a few times as the search option always takes me to the same place ha ha.

Unfortunately i cant post anywhere else for some reason, maybe because i dont have enough posts or something. Thats why i posted here to see if i could get any info.

Lee

you should be able to post now Lee..you have the minimum posts needed.
Rules are setup so that new guys can get the feel of the forum and not Crap in other sections.
We get em,so that is why the rules had to be set up.

N332, N333 and N340 are interchangeable, most of EU spec S4 TII's i have seen came with N340, but when upgrading to Rtek, we regullary got US N332 or N333 units with Rtek and just plugged it in place of N340

..ah Great!..HIGGI!!!

I was going to mention your name,But I could not remember how to spell..Checker's Slovakia...(chuckle!)

Ahh thats cool, many thanks for that. Ill see if i can find a upgraded n332 or n333 ecu as that maybe easier!

Thanks higgi and mistersty!

Lee

I really need a name change..
It's MISTER STYX 69!
Call me STYX..but never late for supper..lol!

Ha ha apologies, my mistake lol! Thats why i chose a short user name - its easier to type!

Lee

Actually i got it wrong, proper ecu number is N344 (EU S4 TII)

Ok, so the N344 is al alternative ecu for an j spec S4 turbo? Jesus, they are even harder to find than the N340...! I better get searching again...

Lee

N344 is EU spec S4 turbo, i have atleast 2 of them here, just installed one into car yesterday and can test another one as well.....

I can scan you wiring diagram (ECU pinout) of EU S4 TII ECU if it helps you to compare with Jspec engine you have....i dont see reason why it would not work....

Looks like you can even use N319 ECU, according to this ebay ad:

MAZDA RX7 TURBO 1986 1988 ENGINE ECU UNIT JDM #420 | eBay

according to this post, N319 (Aus spec S4 TII ECU) is interchangeable with N333 with rtek chip, exactly as we experienced with N344 being interchangeable with N332 and N333.....

https://www.rx7club.com/2nd-generati...u-help-445485/

I bet you can get any of S4 TII ECU's and it will run ok :

N340 (JDM)
N319 (AUS)
N333 (USDM)
N332 (USDM)
N344 (EUDM)

N319 is Japan-spec S4T2 AUTOMATIC, basically a N318 with the AT stuff grafted from a N326 ECU. N34x is Euro-spec S4T2. Euro ECUs don't have the CAS wiring, as they got a distributor instead.

Please edit your post, as its partially wrong (some might say its BS)
We are talking turbo ECUs and they all have CAS, no matter which market.
Only EU NA cars came with distributor in place of CAS and therefor with completely different ECU (N322)

OP of this thread can definately use N319, N332, N333, N340 or N344 and they all are from CAS equipped motors.

Ah, you are correct hIGGI. It has been a few months since I read the Euro-spec catalog and ONLY the n322 received a dizzy. As there weren't any S5NA euro cars that I am aware of, there wasn't a N36x ecu either. My apologies for the misinformation.

So if your car were to be euro spec with an n344 ecu it would be better to not even try to order the rtek chip, but to order a US n333 ecu?

For all our EU S4 cars, we simply got N333 or N332 ECU already chipped by rtek from states, including 2.0 or 2.1....
It was cheaper than shipping your N344 ecu to states, get it chipped and then pay another shipping. And with 2 ECU's, you have option to remove rtek and put back stock ECU when selling car etc..

hIGGI,

I currently have a J-spec swap with the N340 that the engine and harness came with. Am I able to simply buy a N332/N333 with an Rtek1.7 and plug that in to my existing harness?

Sorry to barge in

AFAIK Yes, but i never had chance to try it personally on N340 ECU.....others i did (N332/N333/N344 used in one car)