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While looking into some other V8 trivia I found a discussion of the
Servotronic system ... at least the one for the V8.  In the description it
showed that the system worked by varying the current through the Servotronic
valve on the steering rack ... with the amount of assist being increased as
the current through the valve increased.  Below about 12MPH the controller
drives the valve to saturation to get the maximum assist, but above that
speed it showed the speed/current function with the current going to -0- at
over 100MPH.  This implies that those of us who have disconnected the
servotronic have set the assist to the amount that it would be at a much
higher speed.  I don't have a problem with the assist at that level now, but
it should be a fairly simple matter to rig an adjustable current source that
would allow the amount of assist to be user selectable.  It might actually
be possible to "recurve" the existing module to reduce the amount of assist
at certain speeds, while leaving full boost when parking.  

I don't know if I want to even think about "chipping" my steering right now,
but it might very well be possible ... :-)

Steve Buchholz
San Jose, CA (USA)