I've tuned a Commander 950 Stealthram on a 400 in a '66 with a 200r4. Car makes about 450 hp and knocked down a best of 22.5 mpg. Runs over 20 mpg routinely.
I've also tuned my Commander 950 900 cfm tbi on a 383 in a '66 with a 4-spd. Car makes about 420 hp and gets around 15 mpg. It's probably capable of 16+ with more tuning, but won't do much better without an OD trans.
I never tuned efi before either of these. I read the manual and many of the threads in the Chevytalk EFI forum. Not too hard to figure out and plenty of knowledgable people willing to help. The Stealthram was much less finicky to tune than the TBI car. The manual trans makes it tougher too. Drivability and throttle response was awesome on both.
Another option is the factory ecm with embedded lockers by dynamic efi. It will work on MPFI or TBI, can be tuned on the fly, and has a self learning feature for the fuel map. Although I have not tuned one, I suspect it would be a bit less quirky than the C950, and no harder to tune. Price is good too, and the reliability of the factory ECM is hard to beat.
I've also tuned my Commander 950 900 cfm tbi on a 383 in a '66 with a 4-spd. Car makes about 420 hp and gets around 15 mpg. It's probably capable of 16+ with more tuning, but won't do much better without an OD trans.
I never tuned efi before either of these. I read the manual and many of the threads in the Chevytalk EFI forum. Not too hard to figure out and plenty of knowledgable people willing to help. The Stealthram was much less finicky to tune than the TBI car. The manual trans makes it tougher too. Drivability and throttle response was awesome on both.
Another option is the factory ecm with embedded lockers by dynamic efi. It will work on MPFI or TBI, can be tuned on the fly, and has a self learning feature for the fuel map. Although I have not tuned one, I suspect it would be a bit less quirky than the C950, and no harder to tune. Price is good too, and the reliability of the factory ECM is hard to beat.
