To MFI, or not to MFI, that is the question.

[lupin..the..3rd]

Trying to plan out a custom engine project, and am curious about MFI.

I like EFI, because it's essentially "set and forget". Once it's tuned, you don't ever have to bother with it again. It just works.

How is MFI in terms of maintenance? I'm talking real-world usage, not the "ideal" or "recommended" world, but real daily driver or track use. Do the adjustments "drift" or require periodic checking and re-setting? Does it require regular fiddling with, vigilant adjustment routines, etc? Or does it more closely approximate the "set and forget" EFI?

Is MFI more or less balky than CIS? Or carbs?

Thanks

[Raceboy]

MFI is much less bulky than CIS and MUCH, MUCH sexier than CIS or carbs, or even EFI. Because it is basically Alpha-N injection system from 60's. Just mechanically implemented and much more expensive to build.

It is "set and forget" until mechanical items like space cams begin to wear but that won't happen anytime soon. Though the "set" part is kind of tricky as it is not as easy to tune as EFI because you have to make a custom space cam but that is kind of like burning a custom chip: you get the results AFTER you have installed it and logged AFR. To be fair, you get to fine tune it too a bit, few flat spots can occur though.

[Flieger]

It is set and forget. Until your throttle bodies wear out or injectors get dirty. Those are the only parts that really wear. And the electric lift pump brushes can wear out.

If you stick to a factory recipie like 2.7RS then it is easy to set.