Carb vs. EFI cam

ValiantOne said

Hey all,

I am planning my magnum swap and had a question about cams for carb vs. efi motors. I was thinking about going carb to start and eventually switch to efi. I noticed that the LSA is different on the cams for these applications. Why the difference? Would a cam for one application severly hamper power in the other application?

Click to expand...

The issue is only with "no laptop, hands off, self tuning" systems such as the FAST EZ, FITECH, ectera, and only at idle. That's because they use engine vacuum as a measure of load and they try to self adjust at idle where camshaft reversion with low LSA cams confuses the algorithm. This is NOT a problem with any EFI system where you can turn off the self tuning at idle and set that yourself. Obviously EFI works great with race motors and they have camshaft reversion in spades.