[928uk] LSD

[Richard Armstrong]

Very interesting, Scott

I have noticed that the PSD light comes on occasionally on right hand 
bends when I am not applying power, but cornering 'enthusiastically'.
I have a much more worn offside tyre (due for change), but as I wasn't 
actually applying power I thought that the PSD was a bit sensitive.
It will be interesting to see what happens when I get a new tyre.
Rich A

In message 
<E75C60C3A091F34CAFCF195729F4175701E33447 at cyclone.UK.NDS.COM>, "Walker, 
Scott" <SWalker at ndsuk.com> writes
>
>Note though that the LSD 'changed type' later on - the GT (at least - I can
>vouch for this model!) had the "PSD" - Porsche [electronic-controlled
>limited] Slip Differential.
>
>The original LSD (as is the 'norm') had an up to 40% lock-up on
>[mechanical] detection of wheel slip [spin] on one rear wheel.
>
>The PSD has an electronic (based on [ABS] wheel sensor feedback) slip
>detection, plus a g-sensor to detect cornering-induced wheel slip. This is
>supposed to be derived from 959 technology. It means that the LSD
>operates during aggressive cornering-at-speed to give you fast corner-exits
>as well as low-speed starts where there is mixed amounts of traction
>available to your rear wheels.
>
>In reality... if you're too heavy with your right foot an LSD just allows you to
>spin both rear wheels and end up in a right mess (i.e. pointing in directions
>you hadn't told the steering wheel to produce). Whether that's better than
>just spinning one rear wheel into oblivion (without an LSD) is a separate
>discussion! The point is that an LSD/PSD equipped car does behave
>differently to a non-LSD car when you put the hammer down.
>

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