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I have been working with the bosch DI system on a daily basis since 2007. I have a car running with a secondary rail right now. So I guess the guinie pig is me. It works superb, and gives you back the 75 ft/lbs you lose when the injection event begins carrying over on the compression stroke. It's a precise microcontroller running 4 injectors in the conventinonal PFI location based upon MAP,RPM and a few other inputs.
Since it's programmed to only ramp in fuel above 260kpa and 6000rpm, it ONLY injects during homegenous rich mode. Adding up to 30% of fuel load upstream, it overcomes the hurdle of the injection window of DI.
I think changing the injectors would create more hassle than it's worth. There are more than 600 fuel tables alone.
Besides the fuel limit doesnt result an a blown motor. The cars goes "diesel" with soot when you "overrun" the fuel system. A phenomenon I like far better then running an PFI motor out to it's limit.
The main reason Im interested in the v6 over the V8 is that it has the same DI system form the solstice Ive put sooooo much time in with. hundreds & hundreds of pulls on my dyno, and and equal number of reflashes.
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