Holley EFI

[twobjshelbys]

Originally Posted by Tremelune

It's not uncommon for me to go from 70°F at sea level to 40°F a mile up in the same day...Indeed, most of my fun driving involves driving a mile up a mountain and back.

My goal with EFI is to just turn the key and have it start and run optimally in all conditions...and never have to clean and rebuild it. I have two carbureted cars, and they start and run reliably, but there's always a bit of choke and throttle finesse at one time or another.

A clean, well-adjusted carburetor can be great, but I'm not sure that your position that they're as good and trouble-free as a well setup EFI system is universally accepted.

...$5k is nothing to sneeze at, though...I'm interested in fueling configurations mainly to have the option down the road without having to take the car apart again. Regardless of the intake system, return lines are nice to have, and a lot easier to figure out before the car is together!

A carb should have no trouble with that altitude change as you well know. Plus remember any altitude compensation is not dynamic under operation. The maf only infers altitude at key turn without engine running so if you drive up and back and don't stop for lunch you made no adjustment whatsoever.

Putting in return line is good planning.