Just wondering if anyone has looked into this, yet. If it is, maybe we could finally get a Hondata solution for the S2000. I wonder if the ECU would be backwards compatible (if properly reprogrammed).

 

I'm going to guess (and I'm 99% certain that my guess is correct) that no, it's not.

 

This is why I asked:

http://forums.s2ki.com/forums/showthread.p...&postid=2325745

That thread never got a full, definitive answer.

 

Interesting. I still doubt it.

 

quoted from the LU vtec.net article:

"Where did the rest come from? In our opinion, the secret is in the mixture and ignition timing. While we didn't map the latter, we did datalog A/F mixtures and compare them to earlier models."

"The 2004 consistently runs about a point leaner and never less than a half point leaner on the mixture than the 2000-2003 models. Where the previous models benefited substantially from fuel tuning, Honda gets the mixture pretty darn close to optimal right off the showroom floor. Given that we've seen 7-9 hp gains from fuel tuning alone on early models, now the gains begin to make more sense. Combined with changes in ignition timing, cam profiles, etc. the power gains are quite reasonable "

 

[QUOTE]Originally posted by civicgsir
quoted from the LU vtec.net article:

 

It is not reprogrammable.

UL

 

Given enough time and money, I could do it - I worked on some ECM problems with the early C4 Vettes for Bowling Green plant. I'm an EE and my techs have all the latest equipment in our R&D area. But unlike some companies that play ball with SEMA, Honda is tight with its specs and program maps for spark, fuel, etc, and the physical construction of their ECM's makes it practically a necessity to swap in a special unit, like Mugen's. This is not the best solution - either the program is very aggressive and risky, or loses power by being too conservative. Either way, it is not an optimized tune.

That said, this ECM is not programmable in the sense most hot rodders think of it - that is, it can be re-programmed through the serial or J-port either by something like Hypertech's system, DiabloSport's Predator, a PROM chip swap, or like in the Ford PCM's, piggy-backing on the test port.

So the simple answer is "NO". I would be very hesitant to do it anyway, although I did it on my 2003 Cobra, but used a very experienced dyno tuner with many hours of experience, and who had more than one bad incident of a "toasted" dyno queen going for just a few more HP, and leaning out the A/F to the point that the engine grenaded.

 

Bummer. I'm trying to figure out how I can deal with our emissions laws and still tune for maximum power. Not sure how testing is done here in Texas (if they just jack into the OBD-II port and check for codes, or if they do a dyno test). If they jack into the OBD-II port, I don't know if an ECU like the EMS would report appropriate values to pass inspection.

 

No, an EMS will not report values. You have several choices. Buy a VAFC or Greddy E-manage with a harness adapter. Then remove it when you go in for emissions. Or do the same with an EMS.

UL