Quote:
Originally Posted by arghx7
ECUTek does have the ability to control the injection blend between the two but I'm not sure what the practical limits to that are.
I'll say this. If knock isn't an issue due to E85, you're probably better off going with a high flow intake port, high lift cams, etc, and disabling direct injection. But how many parameters do you have to optimize, and how much time and money will it take to get there? You'll have the combustion efficiency from better mixture preparation, and knock won't be an issue. BUT fuel displaces air during the intake stroke, so that can hurt you. Only an in-depth study could tell you what the optimum combination is.
In the end though you end up with sort of like an expensive Honda engine with two banks of cylinders.
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The closest tuning experience to D4-S I've read about is on bikes with a close to the valve injector, and a secondary injector per cylinder on the other side of the throttle, further up. At high intake velocity/rpm the 'showerhead' injector sees more use as the spray has more chance to suck out heat and atomize when it smashes into the butterfly.
But the tuning process sounds long and arduous, for small gains (bikes need every tiny gain they can get, I guess).
I just can't see any current tuners here making the kind of effort required, though.