Okay, here are some more details...

I do not know the exact current requirements of the injector, we don't seem to be able to get much technical data on them, like I said, they were simply donated to us as is. We're only a small team, and don't have much of a budget to work with... as it is this engine management system is costing us a fortune!

Luckily one thing that is making our life easier is the fact that the fuel pressure behind the injectors is always constant, it does not change with engine speed.. Obviously the speed at which fuel leaves the injector depends on the amount of sucktion provided by the piston on its way down.

I have been thinking about using a DC-DC converted to provide the 60V supply. It would have to cope with a fairly high current demand, probably something around 1A. Unfortunetly my knowledge of analog electronics is fairly limited.. I know enough not to cause things to blow up etc... I'm guessing an oscillator, step-up-transformer, rectifier and smoothing circuit is all I need to get 60V from 12V.. is there a simpler way to do it?.. I'm still interested to see if anyone can come up with a way to store the back-emf from the coil so it can be used to open it on the next cycle. I fear that there will not be enough current availble to be of any use though.

Matt.