[928uk] PSD operation

[Paul R. Smith]

That all sounds like it is working correctly. The PSD does back off the 
locking gradually.

In a cornering situation, with an open diff, the inside wheel would 
loose grip, limiting the torque to the outside wheel, allowing it to 
keep the rear end in line. With the PSD preventing the inside wheel 
spinning, it allows you to apply more throttle in the same situation, so 
when both wheels loose grip the back end goes more sideways. So, if you 
are using the extra grip that the PSD gives you, you need to be extra 
careful. Lifting off the throttle sharply makes it worse.

You really ought to practice in a safe place rather than on a sharp 
country bend.

Smiffy

On 09/02/2012 22:23, Mark Nichols wrote:
> Hi,
> My PSD appears to be working fine. Question is one of how it should work
> in use. I have a steep drive (tarmac) and have to turn sharp left into
> it from a narrow road, so no way I can enter square on. Can't reverse on
> because front scrapes on the road. So what happens is, no matter how
> careful I am, the inside rear wheel has sufficient weight lifted off it
> so the PSD operates. I get onto the drive and the PSD disengages and the
> light goes out, but it doesn't release immediately, I can feel it
> engaged for a few seconds as I ease up the drive (about 20 ft). All
> good. So I thought. Last night I was a little too exuberant on a sharp
> country bend and the back broke away. Fun I thought for a moment, but I
> wasn't able to correct as quickly as I expected. Felt a bit strange
> which I could only put down to the fact that the PSD locked the diff up
> once I started snaking. Of course if the weight was being transferred
> left to right to left, then I might expect that. I had lifted off the
> throttle as it was quite low speed, but it got me thinking. How quickly
> should the PSD activate and de-activate when it engages? Is what I am
> experiencing normal? (I know, I should drive better!). Thanks for
> experience shared.
> Regards
> Mark N
> 90GT
>
>
>
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