Quote:
Originally Posted by TopJimmy
So I'm thinking that the upgraded HPFPs and M5 injectors are for situations where PI is maxed out and you can afford $5-10K for 10% more DI (parts, shop install and tune).
Just having upgraded HPFPs won't make bigger injectors flow more, but bigger injectors might also push stock pumps to their limit too often.
The only way to really know the benefit is by incremental changes with good testing and logging.
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I've seen a lot of posts on the M5 forums about injectors failing and getting stuck open. You can't even run more than E30 on F10 M5's so these people are experiencing failure on pump gas. It seems to be a common issue so I'd be hesitant to run them on an M3/4 because they might not handle E85 well at all