A2Steve
A2OC Donor
Fist of all, a little disclaimer, @celsisone did the donkey work with this setup with trial and error in working out which parts do and don’t work. Having chatted with Brett about this conversion and having met him (great guy) and now done the conversion on my own car, I thought it would be worth writing up what’s involved.
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Setup 1, the more basic setup
There are a couple of options available for engine codes to be able to do this conversion.
If you have an earlier 1.4 you will have the AUA engine which has a single coil pack. The best solution for this setup is to buy a AUS engine code (they are found in Mk4 Golfs, Bora’s and some Seat Leons, that sort of era VAG). This engine has a single coil pack to so can be used as is with some modification, albeit they are harder to find than the BCB engine I have.
You also have the option to use the BCB engine, but you would need to change the rocker/cam cover as it uses individual coil packs like the BBY engine.
If you have the later BBY engine, you can use the BCB engine with it’s existing cam cover as they both use individual coil packs.
You would need to use the following from your 1.4 AUA/BBY engine to go onto the AUS/BCB block you’ve bought.
The car will also run on its factory AUA/BBY ecu and no modifications to the wiring loom will be needed.
The engines are cheap enough to buy (they were in every 1.6 mk4 golf for 5 years, so are readily available). I think this conversion is a happy medium for A2's as it gives the reliability and ULEZ compliance of the 1.4 with the power of a remapped 75. The best of both worlds maybe.
To get yourself a relatively easy conversion and an extra 30 bhp over standard, you could stop there.
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Setup 2 BCB/AUB/AVY Frankenstein
The engine that I’ve been fitting this weekend has gone a little bit further with the following specs
Please note if you are going to do this, the Polo GTI inlet manifold holds larger cc injectors which require you to change the connectors over on the loom (solder and heatshrink wrap job).
The AUB ECU will plug into the standard loom too, but you will need the pin code for both the original ECU and the AUB unit, you can then program the AUB pin code to match the existing pin code with VCDS to overcome the immobiliser.
The AUB ecu also allows the car to rev from the standard 1.4's hard limit of 5800 to 6500.
Ideally it would be great if someone could delete the immobiliser on the Magnetti Marelli AUB ecu and then the whole job really would be plug and play.
________________________________________________________________________________________________________________
Setup 1, the more basic setup
There are a couple of options available for engine codes to be able to do this conversion.
If you have an earlier 1.4 you will have the AUA engine which has a single coil pack. The best solution for this setup is to buy a AUS engine code (they are found in Mk4 Golfs, Bora’s and some Seat Leons, that sort of era VAG). This engine has a single coil pack to so can be used as is with some modification, albeit they are harder to find than the BCB engine I have.
You also have the option to use the BCB engine, but you would need to change the rocker/cam cover as it uses individual coil packs like the BBY engine.
If you have the later BBY engine, you can use the BCB engine with it’s existing cam cover as they both use individual coil packs.
You would need to use the following from your 1.4 AUA/BBY engine to go onto the AUS/BCB block you’ve bought.
- Inlet manifold
- Throttle body
- Exhaust manifold (with pre-cat internal drilled out to release more power),
- Sump and oil pickup,
- Cam cover plastics,
- Engine mount and gearbox mount,
- Gearbox, clutch and flywheel.
- AUS/BCB oil cooler needs to be undone and swapped for the 1.4 equivalent.
- Alternator, air con pump and bracket.
The car will also run on its factory AUA/BBY ecu and no modifications to the wiring loom will be needed.
The engines are cheap enough to buy (they were in every 1.6 mk4 golf for 5 years, so are readily available). I think this conversion is a happy medium for A2's as it gives the reliability and ULEZ compliance of the 1.4 with the power of a remapped 75. The best of both worlds maybe.
To get yourself a relatively easy conversion and an extra 30 bhp over standard, you could stop there.
_______________________________________________________________________________________________________________
Setup 2 BCB/AUB/AVY Frankenstein
The engine that I’ve been fitting this weekend has gone a little bit further with the following specs
- BCB engine block
- AUB rocker cover with cams
- Polo GTI inlet manifold with larger throttle body
- Larger diameter ignition leads
- Polo GTI 4 branch cat free downpipe that will need to be welded onto the existing downpipe under the car.
- Custom cold air feed direct to cone filter
Please note if you are going to do this, the Polo GTI inlet manifold holds larger cc injectors which require you to change the connectors over on the loom (solder and heatshrink wrap job).
The AUB ECU will plug into the standard loom too, but you will need the pin code for both the original ECU and the AUB unit, you can then program the AUB pin code to match the existing pin code with VCDS to overcome the immobiliser.
The AUB ecu also allows the car to rev from the standard 1.4's hard limit of 5800 to 6500.
Ideally it would be great if someone could delete the immobiliser on the Magnetti Marelli AUB ecu and then the whole job really would be plug and play.
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