Carb to EFI

[olddog]

Originally Posted by lippy

If you have a big cam with lots of overlap, you won't be able to run EFI in closed loop mode because the oxygen sensor can't get a good reading with significant unburnt fuel passing through the engine at lower RPM.

It think it is more the oxygen, causing a false lean reading. I have not done this, but the tuners tell me to target a lean AFR at idle to get the desired actual AFR.

[lippy]

I think Gaz and Olddog are both right. But the problem then becomes programming in an entire map of AFR vs. load vs RPM. It gets pretty complicated and time consuming, and you need a lot of dyno time. I considered it but for those reasons just went with a carb, albeit a very good one (Braswell).