I wanna who is running or has run a JSPEC ECU in their ASPEC TII. Did you have any problems or did it run fine. I'm preferebly looking for people with an ASPEC harness and not the JSPEC one. Did you even notice a difference in performance (hot topic)?? Some members might want to know if it is worth purchasing one or if problems will occur with this setup i.e. not running properly, too low octane in the states (common argument) etc...

Any info with your experiences will by much appreciated and will help out with discussions in the future or for some info for other members to search upon later on.
My experience with the JSPEC ECU has not been a good one and other members are having problems also. Just checking to see if it is the computer itself or if it is a problem with the pinouts and wireharness. Thanks in advance for your help!

 

https://www.rx7club.com/showthread.p...&highlight=ecu
Seems as though there is no difference between the N370 & N374 from past threads. There have been a couple of people that have had problems, but I'd say it was not because of the wrong ecu, it was a problem with that ecu or some sensor.

 

i'm running a jspec engine with an aspec ecu................

 

Why would you? The US-spec and J-spec engines are mechanically almost identical, and have exactly the same rated output. If the ECU's had a different state of tune this would be reflected in the numbers.

The differences between the ECU's are for the different ancillary equipment and functions, like the port air, EGR and AWS solenoid valves (not fitted to Japanese cars) or the speed limiter (not fitted to US cars).

 

I figured that much, but wanted to see if anyone noticed anything different. Your absolutely right about the equipment and functions. My ASPEC ECU throws codes for AWS, Port air, EGR b/c I have the JSPEC motor as there is nothing to hook up to it. I see your point though. I've read threads stating that there might be a fluctuation of a couple horses but was wanting to know if perhaps there are any dynos to prove or if anyone can verify this.

BUT STILL the main reason for this thread is to see if anyone running the JSPEC ECU with the ASPEC harness and seeing if maybe there is something different on the pinouts or wiring. Trying to see if it is the ECU or if the two are even compatible. Basically trying to find out if it is just a problem that a few or all are having with swapping ECUs.

FUNKSPECTRUM
I'm doing the exact same thing your doing, i'm trying to find out the opposite. JSPEC ECU w/ ASPEC motor or harness.

 

I'm having no issues with my ECU/engine except for bad idle due to a vaccum leak....No codes are being flashed or nothing....

 

you shouldnt have any problems and the parts missing will not flag a CEL, they dont in mine either, but if you check your codes i'm sure they'll show up.

anyone though with the ECU??

anyone at all? JSPEC ECU (N3Y4) or S4 JSPEC ECU w/ ASPEC harness???

 

The pin-outs are the same, just like the NA nad Turbo pin-outs are the same.

 

I guess I should have worded that differently. I know everything plugs right into each other. Do you think the problem lies in the specific ECUs that we had or is it possible that they do not work with each other, OR, could be that fact that i'm an idiot (i honestly think that might be the case) and the N3Y4 ECU is for something other than an S5 Turbo (is it for an S4?) God i'm gonna hate this if i'm wrong, but it's worth finding out. I'm just tryin to learn and find out possibly who has this ECU(N3Y4), other than myself, b/c it is supposedly for an S5 turbo and when I tried to run it, my car barely ran.

I still wann know who is running JSPEC ECUs in ASPEC harness, i know everyone says it should work, but who can verify?

 

^bump^

 

What ECU are you running, I remember you telling me you had a knightsports upgrade in it, or somesuch?

 

right now, i'm running a N370. I tried to run the N3Y4 as i was told it is for a S5 Turbo. I have a Knight Sports FCD (connected to boost sensor) but no chips or upgrades for the N3Y4 ECU at all.