We tuned this little 205 Rally car on Motec M4 a few years ago. The customer has since upgraded to a sequential Sadev gearbox. The Motec M4, although a good system for it's day, lacked enough inputs to run the sequential shift cut system incorporated into the gearbox.
We decided that the way forward would be to upgrade the ECU on the vehicle, and bring it right up to date. Many of the ECU's fitted to these cars even now, are already well out of date, before they are fitted! We opted for the MaxxECU Sport. This would future proof the vehicle for any upgrades required in the future. It will also bring the vehicle right into the modern ECU world offering complete closed loop fuelling, datalogging, can-bus and a whole feast of other features.
Obviously there were a few things to consider. One of them is the wasted spark system running already with the Motec. Running shift-retard, on NA engine systems is preferable over complete cut, pulling 40 degrees of timing with a wasted spark system could potentially case us some obvious issues. I've left the original system in for now, and will adjust if required. I've terminated a DT connector for the ignition system, with four outputs to it, rather than just the 2, and made a small daughter loom to run the presently fitted system. To this end, I've also wired a 'cam' sensor to plug into an original Distributer if I need to pick up a 'home' signal.
We've taken the opportunity to upgrade the injectors also. It's presently fitted with a staged injection system, running 8 injectors. I'm using an injector we keep in stock with excellent characteristics. It's slightly shorter than the ones fitted by 14mm, but I will use spacers we keep here to rectify this issue.
We've taken the opportunity to add in a few extra inputs, and outputs to the inside of the car, and in the engine compartment. This will allow us expansion in the future in minutes.
I'm genuinely looking forward to seeing how this behaves on the new ECU. It's always very interesting to see how things behave on modern ECU systems, especially when you've tuned them on the old system before.