Reply to "Atomic EFI vs. FAST EZ-EFI 2.0"

We deal primarily with efi conversions and tuning at the shop and have experience with both of these units. I am sorry to say that neither system has impressed me very much. On the Atomic unit we lost a fair amount of power on the conversion and the unit leaves very little ability to change much of anything to any fine amount. The owner also complains of driveability issues such as surging at cruise and such. Being there is no direct adjustment for timing or fueling and they are self tuning there was nothing we could do. The Fast EZ 2.0 is much the same. We had fueling issues on the dyno as well as some weird system resets and shutdowns. Fast took the unit back for repair and the owner decided to go with the sportsman unit so we could have a bit more adjustment. I strongly urge anyone to get a unit that is end user tuneable as I have been unimpressed with the so called "self tuning" engine management systems out there. They work ok on a fairly mild setup for a simple plug it in and get it running but from what I have seen I would not expect perfection. Sorry if this isn't what you want to hear but I feel people should know what they are getting into with these systems. Best of luck with your decision. Done right EFI can be absolutely amazing.