Hi Gavin,
I have injected the 2.25 in my Game with parts from a Honda CBR600RR and Megasquirt. So it has 4 individual throttle bodies with 4 injectors. I have also seen another one done by putting a plate between the inlet manifold and block with injectors in the plate. Either one seems to work well. I don't know a thing about the 2.6 motor though, could you drill to put injectors into the inlet manifold as close to the head as possible? Megasquirt will let you control both ignition spark and timing as well as the fuel which really does make it a good choice. I also used the coil on plugs from the honda bike and drive them directly from the megasquirt. Personally I think if you can individually inject each cylinder it will be better than a single injector into a plenum, you have much more control.
Of course the other thing you really do need to do this yourself is a wide band O2 sensor and controller. Otherwise you need a dyno or such like and it will get expensive. TechEdge is an Australian company who do these.
Cheers,
TimJ.
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