Quote:
Originally Posted by SomeGeoffGuy
Really? So how does that work with direct injection. The benefit of DI is that you aren't compressing the fuel mixture which keeps off detonation. Now you are, so how does that work? You might not even be able to run stock compression if you are spraying fuel in the intake. Without the DI, you might aas well tear the whole system off and just run it with regular fuel injection.
-Geoff
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Geoff, when you are WOT, the DI system operates like a PFI system.
IT injects fuel during the intake stroke to create a homogenous charge.
The benefit of DI when in this mode is the reduced droplet size from 2200psi, and the latent heat of vaporization occuring within the chamber.
Adding up to 30% fuel upstream will change nothing while in this mode of operation. Nor would 30% of proper AFR be ignitable.
Only in a few light light loading situations(and low rpm too) does the system actually wait until the comrpession stroke to inject fuel.