On the 6.4L diesel, there is a switch to engage or disengage traction control if excess power causes traction loss. Many high performance vehicles such as Mustangs also have traction control, often with a switch to manually shut it off.
Jim,
In regards to the throttle control, as near as I can figure it isn't using a parabolic sort of curve... at least not as you described. It appears to be more that it transitions from the lower map to the normal map. I guess the effect would be the same, but it isn't handled in a single map.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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