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Old September 13th, 2017, 07:43   #1
ssaric1.9TDI
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Default ECU Question

Looking to buy 2003 Wagon stock and I have a quick question regarding the ECU. I currently have 2000 sedan with few mods and I was thinking to transfer the mods on to the 2003 Wagon, however can I also swap the ECU? Will it just be plug and play or do I have to do another ECU Tune? I was thinking that I can just swap it and make the Wagon super fast and Sedan super slow. Let me know guys what you think and what would be the easiest way to do this. Mods I have on Sedan are 1019 nozzles, 11mm pump, egr delete with race pipe and of course ECU Tune.
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Old September 13th, 2017, 09:13   #2
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I don't think the 2000 ecu will be compatible with a 2003. The glow plug circuit is different.
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Old September 13th, 2017, 09:19   #3
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You may already know this, but even if compatible it's not just a plug-and-play operation... both ECUs would need to be re-coded (using VCDS) to adapt to the clusters.
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Old September 13th, 2017, 09:20   #4
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Thank you dweisel. Do you know if that's the only reason? Can replace the glow plug circuit from 2000 to 2003?
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Old September 13th, 2017, 09:41   #5
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Originally Posted by Vince Waldon View Post
You may already know this, but even if compatible it's not just a plug-and-play operation... both ECUs would need to be re-coded (using VCDS) to adapt to the clusters.
Thank you Vince Waldon I did knew that both ECUs would need to be re-coded by using VCDS. My main concern is the tune on the 2000 ECU will it work on 2003 once I put all my goodies on it?
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Old September 13th, 2017, 10:03   #6
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there are other differences also. I would rule that out as a easy changeover.
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Old September 13th, 2017, 10:05   #7
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Thank you dweisel. Do you know if that's the only reason? Can replace the glow plug circuit from 2000 to 2003?
Not sure if that's the only difference . I know I swapped a 2000 ecu into an 02 and the 02 ran terrible. Not sure why.
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Old September 13th, 2017, 10:35   #8
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there are other differences also. I would rule that out as a easy changeover.
So the best thing would be just to do the tune on the Wagons ECU.
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Old September 13th, 2017, 10:36   #9
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Not sure if that's the only difference . I know I swapped a 2000 ecu into an 02 and the 02 ran terrible. Not sure why.
Maybe the 03 would run terrible as well. Looks like the best thing would be to do the tune on the 03's current ECU.
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Old September 13th, 2017, 10:44   #10
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Maybe the 03 would run terrible as well. Looks like the best thing would be to do the tune on the 03's current ECU.
Yes, definitely
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Old September 13th, 2017, 11:06   #11
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Thnx everyone for the quick response. I will let you know how it goes but first thing is first, I have to get that 03 Wagon if everything works out. In case I don't get it I'll just keep enjoying my 2000 Sedan and puff some black smoke.
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Old September 13th, 2017, 11:36   #12
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I do hope you are not one of those guys that "roll coal". When people do that it makes the rest of us diesel owners look bad.
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Old September 13th, 2017, 14:55   #13
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I do hope you are not one of those guys that "roll coal". When people do that it makes the rest of us diesel owners look bad.
I only do it in when someone is tailgating me but other than that I drive it easy. Check out my MPG's and most of the time is only city driving.
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Old September 13th, 2017, 17:09   #14
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Rolling coal means unburnt/wasted fuel. It's about as productive as smoking tires...
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Old September 14th, 2017, 07:43   #15
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Rolling coal means unburnt/wasted fuel. It's about as productive as smoking tires...
Couldn't agree with you more. I never liked burning tires on a FWD car, it just didn't feel right to me and it wasn't the same as RWD car. As far as smoke goes, some is acceptable considering the mods and tune and also mileage. Once the prices of diesel go up to like $4 I'll switch to economy tune.
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