They say an '05 A/T ECU can't be reflashed but an '04 A/T ECU will work with an '05. Basically I'm going to get myself one few 2004 A/T ECUs in Canada. I called the Acura dealership and they said it is no problem they can send it out and it will get done. BUT they said they think it is all rumor that the '04 A/T ECU is compatible with the '05. Especially once it is reflashed. I was wondering if there is someone out there that has a 2005 A/T TSX with a reflashed 2004 ECU. Maybe someone could enlighten me on this, if I should or should not go through with it. Any help would be appreciated .. Thanx!

 

you should search first. there are few '05 AT owners who got reflashed with the '04 swap method. also no problems with the swap and its fully compatible

 

i know |crazyazn| has the reflash and is using an 04 AT ecu on his 05.

so it is compatible and it works fine.

 

i've had the 04 ecu installed and synched w/ my immobilizer and keys now since oct/nov and it works fine! however, still haven't done the reflash yet, but it WILL work

 

As far as the 2005 M/T goes, that can be reflashed without any swap correct? just the A/T requires a swap.

 

yea just the AT

 

So it is as easy as getting the '04 A/T ECU getting it reflashed and basically just making a clean swap with the '05 ECU? everything willl work perfectly as if I never swaped like gauges, sensors & keyless entry? except I will have about 20 more HP? [that is what I heard it is roughly a 20HP increase] The dealship that said they could do it also said they have never seen it done so if they have to do more than simply send it to get reflashed and swap it with the '05 ecu I dont think they will do it!

 

As mentioned before, there is a thread on here about the swap. In short, you need the new ECU to recognize your immobilizer and only Honda and a few locksmiths have that ability.

 

Got my reflash around 50,000 miles and still running strong. Dealers don't know anything since i got it done and they warned me it wouldn't work.

 

I just talked to a tech from Acura and he said the "maintenance tech" is different [the wrench light] they are configured different blh blh blh I told him I talked to people that had it done and he said they where lieing because it's not possible SO .. either thousands of people have band together to lie to me or the tech from Acura is mistaken :P [hoping is #2 lol] is there anywhere I can send the '04 ecu to be done? or am I just gonna have to try to find a place to bring it to and install? If I can send it out will they do EVERYTHING to the point where when I get it back I can just plug the ecu in and go!?!?

 

why would you bother confirming compatibility with an acura service department? you're just bringing unwarranted attention to yourself and your car.

people have done it on the board, and it works. go to the hondata website for all the directions.

 

That same tech will tell you there aren't any problems with the A/C, oil consumption, rattles, and compatibility with other Acura/Honda fobless keys. They know many things, but they don't do the mods themselves. I can only speak to the mods I've done and I've also helped out a member get their 05 AT ECU swapped out long ago. I can assure you, it can be done.

 

The tech told me there is no such thing as a reflash or an ecu flash...

I told him give me a free set of fog lights and ill show them wrong.

They never agreed to it.

 

Yeah, the waranty attention is one reason I didnt want to go to my dealship thats why I went to a different one and the first place i tired the guy I talked to didnt know what an ecu was he thought it was part of the body so I guess its just the area I live in lol but thank u all for the help I'm going to try to contact Hondata and see what I can do!

 

total newbie on the flash idea..can somone explain exactly what it does..i have an A/T 05..please.than you

 

Note that the majority of the gains you see are NOT peak power, but rather power under the curve. In other words, the reflash isn't going to make your total hp increase from 200hp to 220hp (though you'll probably gain 3-4 peak hp), but rather the reflash will allow you to hit 200hp at a lower RPM than stock.

Where the largest hp difference occurs is between 5-6k RPM. In stock form, there is a huge power drop in this rev range that occurs right before VTEC engagement. With the reflash, the power drop is eliminated.

 

I suggest searching, but in short...

The car has an ECU (a box that runs everything in the car). Hondata takes it, puts in new Air/Fuel mappings, VTEC engagement, etc etc to generate more power. It definitely voids your warranty if you do it and if Acura finds out about it (not difficult, but most aren't looking for it).

 

I actually heard reflashing is not street legal [i heard this from a Hondata distrabuter] and when they remap the fuel it burns too rich after and it kills the gas milage.. is that true?? I didnt think it would hurt anything that bad..

 

View my mod list realizing I just got 34mpg going to Tennessee a month or so ago. As to it being street legal, I'm not sure that it does anything to negate the CARB emissions controls. It may not be ULEV anymore though.

 

According to Hondata, they didn't touch the maps in closed-loop mode, which is what will be used during normal driving. Therefore, I don't see how it would run too rich.

 

Making an engine run rich won't generate more power without added oxygen. There'd be no point to purposely doing it when they change the air/fuel ratio maps.

I still get maximum fuel economy. The only reason why someone would have less fuel economy is if they tend to go over 4.8k rpm's alot (vtec). If you're driving regularly, you won't hit vtec often. On a trip to vegas, the only time I hit vtec was whenever I entered the freeway.