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Old 12-09-2004, 11:58 PM   #1
MrDestructo
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Default will an '02-'03 ecu work in an '04? (STX related)

Well, I'm preping my car for STX AutoX and I have spent most of my money on suspension stuff, which I figured was the right thing to do. However, I'm worried about my power mods and the whole open/closed loop thing on the '04s.

A while back I read about the option of switching '02-'03 ECUs into an '04(stock ECUs of course) as a cheap alternative to $600 plus ECUtek, Accessports, or custom tuning, just to get rid of this potential '04 problem.

I did a search and all I came up with that was any good is this thread:

http://forums.nasioc.com/forums/show...2004+open+loop

It talks about this issue, and a vendor did the swap and everything worked out great. Has anyone else done this? Does it make sense?

Thanks in advance for the help!!!

MF
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Old 12-10-2004, 04:27 PM   #2
03WRXMA
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If your sole point of swaping ECU's is to correct the problem, you should go to the dealer as they say and have them fix it.

Why pay for a used ECU for your new car?
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Old 12-10-2004, 05:08 PM   #3
MrDestructo
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So you think after doing all those STX type mods(UP, DP, Catback, Pulleys, suspension, etc.), that I'm going to ask a dealer to fix an engine management problem with my car! You're crazy!!! He/She/It would laugh in my face and kick me out the door!!!

I'm looking at this as a viable alternative to very costly ecu changes. I did alot of research into the subject, and everywhere I looked people said that I should get engine management changes if modding '04+ model year WRXs. I only found one instance(see above thread) where someone did this switch and it seemed to work out well.

As always I'm looking for real results, not speculation.
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Old 12-10-2004, 05:15 PM   #4
03WRXMA
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Ahh.. my bads, I thought you had mainuly suspension! "I have spent most of my money on suspension stuff, which I figured was the right thing to do."

I would spend the money on a Cobb AccessPort. A used ECU will cost from $200 on up so why not put that money into something worthwhile!
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Old 12-10-2004, 05:17 PM   #5
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Quote:
Originally Posted by MrDestructo
As always I'm looking for real results, not speculation.
Ill tell you one think for sure, since you car is making more power than it was stock and you HAVE NOT added any EM, your killing your car quicker than if it was stock.

How's that for results


Bottom line - Just spend the extra $400 and get some EM. You will get more power/better fuel economy/and stop the OL CL crossover problem.
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Old 12-10-2004, 07:31 PM   #6
bofh
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Quote:
Originally Posted by 03WRXMA
If your sole point of swaping ECU's is to correct the problem, you should go to the dealer as they say and have them fix it.

Why pay for a used ECU for your new car?
If it was that easy, it would not have spawned half a dozen threads in three forums. Unless you know different, and if so, share!
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Old 12-10-2004, 08:13 PM   #7
MrDestructo
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Well, why should a pay $600 for a one time reflash that "might" give 2hp difference to the wheels. I don't plan on going any further than STX mods, so why would I get the AP and only use it one time. There has been documented evidence and dyno proof that the allowed STX ecu mods yield ~2hp from one car to the other by adjusting the fuel and timing. My sole purpose for getting it to get rid of the OL/CL issue if it comes up.

I don't have a money tree in the back yard, so the money saved would go along way toward better suspension mods for my car.

Get it????

Quote:
Originally Posted by 03WRXMA
Ahh.. my bads, I thought you had mainuly suspension! "I have spent most of my money on suspension stuff, which I figured was the right thing to do."

I would spend the money on a Cobb AccessPort. A used ECU will cost from $200 on up so why not put that money into something worthwhile!
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Old 12-10-2004, 08:25 PM   #8
03WRXMA
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I get it, but do you.......
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Old 12-10-2004, 09:08 PM   #9
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Quote:
Originally Posted by 03WRXMA
Ill tell you one think for sure, since you car is making more power than it was stock and you HAVE NOT added any EM, your killing your car quicker than if it was stock.
I doubt that exhaust mods alone are going to kill his car any quicker. EM only increases boost and timing which exhaust mods let you safely run.

I have heard that you can run an 02 ECU in an 03 but not vice-versa. Don't know if you can run either in an 04, but I'm guessing no.
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Old 12-10-2004, 09:20 PM   #10
03WRXMA
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All I am saying is that the mods will magnify the CL > OL fueling crossover issue, causing more harm than good, nothing more.
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Old 12-11-2004, 04:44 PM   #11
bofh
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Everyone has said a lot, but no one has answered the question.
Quote:
Originally Posted by MrDestructo
A while back I read about the option of switching '02-'03 ECUs into an '04(stock ECUs of course) as a cheap alternative to $600 plus ECUtek, Accessports, or custom tuning, just to get rid of this potential '04 problem.
...
Has anyone else done this?
I too would like to know...
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