Quote:
Originally Posted by shr133
Hi guys,
I just got my FRS and a ECUTEK tuner but I have been tuning engines for years, started with holley carbs...
I think that it's more about drive ability...
I'm going to run both at all times to eliminate the transition point from DI to both...
Turing PI on and off and on again makes no sense to me. either on or off or a mix..
I have to do some tweaking, I filled in some gaps with 10% PI and it seams too low but it still runs better, so I'll go to a min of 20% PI at all times....
The 35% - 20% PI part of the map run better to me than either 0 or 10%...
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Running too low PI could lead to running at regions lower than the Min Pulsewidth. Every injector has a minimum pulsewidth which is usually 1ms for the type of injectors used in the FRS. I would advise using completely no PFI or partial (like 30-40% PFI) but never too low. As we go towards higher speeds and loads this is no longer a problem since a low 10% still results in a decent pulsewidth at peak power etc