[Cobra #3170]

Scott and I spent almost all day yesterday tuning the FAST XFI 2.0 traction control. Although I have been critical of the FAST XFI systems inability to learn quickly in the past I have to say the traction system is excellent. I have a 45 tooth reluctor wheel mounted to the differential driveshaft flange. I used a GM truck ABS sensor that costs about $14 and is way cheaper than earlier sensors. It is mounted to a bracket mounted on the differential. I built a circuit than converts its voltage variations to a 5 volt square wave pulse so the FAST system can read it. We set up a marked strait of about 150 feet and Scott would floor it at the first marker and let off at the second marker.
THE fast system records engine rpm, drive shaft rpm, MPH, drive shaft acceleration rates, throttle opening, spark advance all vs time as I have it set up.
We adjusted the following factors:
The amount of drive shaft acceleration before intervention
The minimum speed before intervention
The amount of timing retard
The time before reacting to detected slip
The amount of time before full timing is ramped back in
The slope of the intervention curve

I have to say the system worked wonderfully well we went from 70 mph for the test distance to 76 mph. The acceleration peak was also flatter and more sustained using traction control. We made up 4 different programs for use on different surfaces depending on available grip. The system picks up wheel slip before a complete revolution of the rear tire and way before Scott can feel it
We can now use full available throttle body opening instead of disconnecting the secondaries. We retard the spark a maximum of 20 degrees for short periods of time so it will not hurt the engine either. No ignition cut that pounds mechanicals either. I have a couple of crappy Iphone videos of the runs but do not know how to post them here. All in all a very productive day. We will try it in competition next weekend at Goodguys in Pleasanton.