Re: Servotronic

[David Kavanagh <dak-ignore@rochester.rr.com>]

Steve, If I remember my electronics education, putting the appropriate
value (and wattage)
resistor in series with the rack would decrease the assist according to
the resistor value.
Without doing some measurements, I don't know if that requires .5 Ohms
or 1K Ohms (or 1/4 W
or 10 W resistor). I suppose if you knew the resistance of the rack
(assuming just two connections
to the rack), you could figure out what kind of power was going though
it at 12V and pick the
right resistor and see if it "feels" right.

	David

PS. Does the '91 200 20v have the same rack?

"Buchholz, Steven" wrote:
> 
> 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)