Like JDEstill said.... it's a "stand alone" fuel/computer system. DFI is mostly for professional tuners and does take some getting used to in regards to the different tables. But as far as adjustability, it was one of the best aftermarkets ECU/systems available.
Was over at BDS last week and was talking with Craig the owner. He is an Accel EMIC as well as I am and he said that John Meany (the inventor of the DFI system) is coming out with a system that supposed to knock the sock off anything out there in the market MOTEC included.
The only thing I don't like about the old Gen 6 is that they don't have a wide band input like the newer systems do. It works with a standard O2 sensor that is limited in A/F reading capability to accurately tune the system. Some of the newer systems... you can just plug in an A/F ratio where ever you want it to be and the system will automatically adjust to achieve that A/F ratio at any given load/RPM point. The closed loop option of the DFI system is ok if you're trying to get the thing to stay stochiometric outside of WOT, but I would turn off the closed loop function for a race application.
Edelbrock makes an awesome pro-data logger for a reasonable price. The built in accel data logger is ok at best.
