Throttle tip-in issue/stumble (3.0 5-speed)

[Masospaghetti]

Originally Posted by Happy

Pretty rad we have an E53 tuner on the forum.

Not sure I'd call myself a tuner, but glad you think so! If there's any interest I'll put together a how-to on getting started (how to set things up and connect, etc).

[Bdc101]

Originally Posted by Masospaghetti

I'm also not an expert by any means, but before you could atomize the fuel you'd have to wet the surfaces, right? i.e. there's a certain amount of fuel that condenses on the cylinder walls and piston top and doesn't contribute to the A/F of the ignitable mixture?

No, fuel will only burn once it has vaporized. It may land on the surface of the piston and walls but it vaporizes before it can burn. If there is any liquid fuel left when the flame ignites, the liquid fuel evaporates before it starts to burn.


The point of any kind of fuel injection (whether electronic or plain old carburetors) is to first meter in the exactly right amount of fuel, and second to vaporize it completely. I'm guessing that statement from the manual was just incorrect, or was talking about something else.