Quote:
Originally Posted by eschaider
I actually think the Accel DFI units that Roush used before the FAST units were even worse.
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The Accel unit was an early powerful system (I'd compare it's complexity to the MoTeC unit) but without ANY learning capability. It had a few tunes that would get the engine running but "tuning" it required you to visit all of the tables. They even offered a course on how to do it. The hardest table to do was the one they didn't complete - the altitude table which REALLY matters when starting at 5000' and going to 10K+' as I did. The default table from Accel was flat, so no compensation was done and the result was that it ran rich. The accel system is powerful, but requires much more knowledge to set up and a dyno do do it. They had gotten one of the overlooked aspects of the 8-stack and that is that at low RPMs with the throttle bodies barely open the fuel injectors fire but do not get adequate air flow to properly mix and the engine actually runs rich which is counterintuitive. I don't know if the FAST or any of the other self-learning systems do actually understand that aspect of that particular config.