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M 031 Sports Chassis Option

G

G53

New member
Hi,

I recently purchased a 2005 (55) Carrera S with the M 031 sport chassis option, which I understand to be -20mm suspension and a mechanical LSD. The car also has sports chrono and of course PSM. I read recently that the Sport Chassis is actually quicker around the 'ring than an S on sport setting in PASM (in the hands od Walter), which is reassuring. I would be interested to understand how the LSD works with PSM when the sport setting through the chrono, is activated ?? I can feel more slip in the back. Does anyone know whether the PSM actually works on the LSD, because I would have thought that it would interfere??

secondly I would like to find out how many UK cars were specified with this.

third question is should I have got 10% off at Porsche for my recent 40k mile service as i'm a member??!!

thanks in advance
 
Welcome and I hope someone can answer your question.
Only thing I can help with is the discount, Yes they should of offered a 10% discount, sometimes on parts only and other times on the bill.. however the dealership is not forced to do so..
Especially if not asked..

garyw
 
This'll take a while - sorry in advance for being long winded. [X(]

PSM an automatic electronically operated control system to stabilise the vehicle at its limits. Sensors monitor direction, speed, yaw velocity and lateral acceleration and the PSM computes the actual direction of motion. If this deviates from the assumed course, PSM initiates braking of individual wheels to stabilise the vehicle.

Under acceleration on wet or low-grip road surfaces, PSM improves traction by using the ABD (automatic brake differential) and ASR (anti-slip regulation) functions. In "˜Sport' mode on the Sport Chrono Package, the threshold is raised particularly at speeds of up to 45 mph. The integral ABS further reduces the braking distance.

LSD (limited slip differential) is mechanically operated and is basically a clutch pack operating only on the rear wheels. It allows engine power through to the wheel with the most traction in slippery conditions. It plays no part in retarding the vehicle and is particulalry useful for powering away from uphill hairpins - and there are quite a few of those in this neck of the woods. [:)]

Phew, hope that helps.

I think I'll go and lie down in a darkened room! [8|]

Regards,

Clive.
 
Lancerlot and Garyw thanks for your replies. So if I understand this correctly it follows that with no LSD the PSM will brake the wheel with less traction but cannot divert more power to the wheel that has traction and therefore in some circumstances cornering speed is slower than with LSD...?

If anyone else has the Sport Chassis option I would be keen to hear from you!

Thanks


 
That'll be me then. When I did a Porsche day at Millbrooke the instructor was adamant that sport suspension was the way to go and if it was his money he would choose that option. I beleive however that PASM has been much improved with the later cars so possibly his opinion may have changed.
 
Geoff, good to hear from you. Did you specify the sport chassis from new or buy second hand? I must admit to buying my car in a complete rush before I went overseas for several months. My heart sank when I realised that the little button with the shock absorber wasn't there (a tad embarassing). But having done some research it's not as bad as it seems and your comments are reassuring. I see also that the 911 Sport Classic has -20mm lowered suspension and LSD (it also has PASM)....so that has to be a good thing!

Regards
 
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