Re: XJ6-Series II; Steering wheel return / Oil pressure

["Kirbert" <palmk@mailer.gadcomm.net>]

> From:          Bård Th Hesvik <baard@telesoft.no>
> I also know that
> changing the belt pulley on the power pump gives a heavier steering thus
> more road-feel.

I know nothing of the XJ6 SII, but I certainly know that this would NOT be
the case on any power steering system I'm aware of!  If changing the pulley
makes a difference, then changing the engine speed would make a difference,
and driving the car would be nuts -- boost changing every time the engine RPM
went up or down.

The pressure output of the GM power steering pump on the XJ-S is not a
function of RPM, but rather of a spring in a pressure regulator within the
unit.  Perhaps replacing this spring with a lighter one would result in lower
system pressure and hence less power steering boost.

On the XJ-S, a common problem is that the power steering won't "keep up" with
the steering.  Working the steering hard, sometimes you run out of boost and
suddenly have manual steering -- very disconcerting in the heat of the
moment.  I suspect this is usually due to dropping the throttle to idle, and
idle is too slow.  Whatever, could possibly be fixed by fitting a SMALLER
pulley to the power steering pump, so it turns FASTER at idle, but then what
happens to the pump at 6500 RPM?

 -- Kirbert      |     If anything is to be accomplished,
                 |     some rules must be broken.
                 |          - Palm's Postulate

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References:

• XJ6-Series II; Steering wheel return / Oil pressure
• From: Bård Th Hesvik <baard@telesoft.no>

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