Originally Posted by
Chesh740R
As for Ecu systems, the cheapest method is to take the ECU from the donor engine vehicle.
This can be a bit of a headache and seem very daunting, but with some time spent poring over wiring diagrams it can easily be achieved. You just need to ensure that all engine sensors are traced back to the fuel and ignition ecu's.
Any wires left over, you should be able to determine what they do from wiring diagrams.
I can't quote for certain on T5 wiring set up, but on other engine swaps i've done the ECU system wiring is pretty much self contained and can ussualy be swapped over and then all that is needed is to provide it with Earths and Postives, of the Switched variety, and some hooking up to exsisting FI compents like the fuel pumps. However you must ensure the fuel pumps are of the same Delivery capabilty as the T5.
Of course using the Standard ECU system allows you to get the car started quite quickly and then you have further access to the remapping companies should you wish to extract more power than stock.
However of course the best option is too buy an aftermarket programable ECU system, this is where you would need to do some research, as i'm not sure which companies support 5 Cylinder engines. Look towards the Audi Quattro tuners or swedish tuners of T5's. This way you can future tune any further modifications you do and seeing as the engine bay is bigger you can fit a header and remove the restrictive exhaust manifold that is stock on t5's due to space constraints.
Enjoy the build, i'll get round to dropping a 5 pot engine in something RWD at some point, but i'm not done with the old 4 pot engines yet. I forsee myself playing with 16v turbo redblocks once i've finished my 8v turbo project.
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