J's Racing ECU installed
 

Hi guys,

I have already posted this topic in Uder the Hood but haven't had much reponse. I am hoping someone here can help me:

I am currently running the following mods:

Mugen CAI
J's header
Amuse dual
stock ECU

I have been told that my car could be running lean in the lower rpm especially just below VTEC that I could be risking damage to the engine.

Now I want to get an ECU which will work well with this setup and not cause any long term damage.

I have been told that the Mugen ECU will not be suitable as it leans out the mixture throughout the rev range and the AMuse ECU is similar.

I really don't want to go down the route of dyno tuning the car as I don't intend to go beyond this level of tune. Therefore I am hoping some of you guys can suggest an ECU that would work well with this setup. I am leaning towards a J's racing ECU at present but I don't have enough information on what it does with the fuel/air ratios.

Any help would be most appreciated :)

Can somebody please help?

:hello:

a good topic! Amuse Boy :) i was thinking the same thing...
I am currently running:
mugen cai
toda header
TS exhaust
stock 04 ECU

i wonder how much I can gain from aftermarket ECU and if its worth awhile. Or else, my other option would be SC. ;)

PC - I am not overly concerned with more gains but more concerned that I may be running too lean with my setup...but now that you mention it - even more power would be great :)

Why not just get an EMS and have it tuned?

Perhaps I'm missing something, but I don't see anything that you've added that would cause your stock ECU to lean out and cause damage to your engine. Simple I/H/E setups shouldn't affect you that much.

You might stand to gain a few ponies from and aftermarket ECU, but if you do, its because it did play with your fuel and timing ;)

BTW, on all these JDM ECU's its recommended that you run 100 octane or higher. I know on the Mugen ECU, it cuts your knock sensor.

Lack of tuners in the UK? But I don't want someone who is not familiar with an S to tinker with it.

Someone posted that the car is taking in more air but the ECU may not be compensating for more fuel in the lower rev range. My car feels really strong throughout the rev range but I want to be running it in a safe manner.

If I were you, I would get your actual A/F numbers before spending the time & money in upgrading your ECU. Is there any reason why you feel it may be running lean? Is you engine making noises in lower rpm? Is it boggish at all?

I believe there is a guy with I/H/E in the Under The Hood section looking at an aftermarket ecu after seeing his #'s (hes in UK too). Maybe you should get in touch with him- https://www.s2ki.com/forums/index.php?showtopic=304973