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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old August 5th, 2016, 09:00   #1
turbocharged798
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Default ALH in a 2.5L MK5 Jetta

Legalities aside, is it possible? Biggest problem seems to be having the ECU communicate with the MK5 can-bus network. I haven't tried hooking up a MK4 ECU to the MK5 can-bus network but I am really wondering if it would communicate or not.

Regarding mechanical, MK5 has electric PS with its own controller so it looks like all it would need is a PS pump delete and a bigger alternator. The clutchless AC compressor should fit, and BRM boost piping should be a bolt on.

Thoughts?
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Old August 5th, 2016, 17:17   #2
turbocharged798
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So something interesting I found, the Bently manual for MK5 says that the stock auto 09G slushbox has very similar gearing to a stock ALH 5 speed in 6th gear. Since the 5 cyl uses the same bell housing as a 4 cylinder, the ALH should bolt right up. Problem is that will the TCU even communicate with the ALH ECU and rest of the car via can-bus. I have no idea.
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Old August 9th, 2016, 07:27   #3
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as far as i know, nobody has figured out how to make an ALH work with an 09A trans in regards to ditching the 01M for an 09A on a MK4 car.

Anythings possible with enough time and money but i think your looking at creating a completely standalone trans controller to make it work... and thats if the engine side works right to begin with.

Maybe look at some euro options? maybe something that came with a mk4 engine electronics, while using mk5 body/trans electronics already existed there?

electronics isnt my bag, just spitballin here...
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