18 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHwhat is PSM?
Leading reported evidence
Use abs
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Use abs' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use abs' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
ABD uses the brakes to act as an electronic version of a limited slip differential to keep drive torque going to the rear wheel with grip.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
18 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I know PSM stand for Porsche stability managment, but i want some technical detail of what it does. I need to determine is it a must have option for my search.
In a simplified explanation, PSM monitors all kinds of driving input from yaw rates, steering wheel inputs, brake inputs, tire slippage, etc. The system is designed cut the throttle and/or administer braking to the appropriate wheels to prevent the car from spinning, losing traction, or basically losing control.
Whether or not it is a must have option is a question only you can answer. You need to look how you drive, what type of driver you are and under what conditions the car is driven. PSM is a very nice drivers aid in adverse weather conditions, however, contrary to what some people say PSM is not necessary for driving in snow. The 911 when equipped with the proper tires and a driver with decent knowledge and experience of winter driving conditions can easily drive a 911 in the snow. However, PSM offers a great safety net for the unexpected. The same can be said of daily driving under any condition. It is not necessary but PSM does offer a nice safety net (likely the reason it is nick named by some Please Save Me) for the unexpected or mistakes.
Track driving is another story. I do not have enough experience or skills with regard to track driving to really comment on PSM�s intrusion or lack thereof. If you plan on tracking the car regularly I am sure there a few skilled drivers here that could give you more guidanc
It's another safety item to consider, but it is not a must have in my opinion. I have PSM and I feel more comfortable knowing that given an unexpected situation there is PSM looking over my shoulder to give an extra bit of safety.
PSM is not intrusive on the race track as long as you are smooth.
Some acronyms from Karl S:
ABS - PSM controls and uses ABS. ABS remains active, even when the PSM button is turned off.
ABD and ASC - Automatic Brake Differential and Automatic Slip Control. ABD uses the brakes to act as an electronic version of a limited slip differential to keep drive torque going to the rear wheel with grip.
ASC is simply traction control, it closes the throttle if both rear wheels are slipping under acceleration. This could be important in a wet race where you want optimum traction in slippery conditions but is not as critical on the street, where you shouldn't be trying to maximize acceleration when the conditions are slippery.
ABD remains active, even when PSM is turned off.
EDC - Engine Drag-torque Control. This function is basically to counter trailing throttle oversteer which is what you get when you are near the traction limit in a corner and you lift, which begins to rotate the rear of the car. A well trained driver will use this characteristic of the 911 to get the car to turn in for a corner, so having an electronic aid to counter it is not always desirable. Of course, this feature can be turned off via the PSM button.
DDC - Driving Dynamics Control. Basically this system detects understeer or oversteer conditions and selectively brakes the appropriate wheel to counter the unwanted condition. DDC will also retard the throttle if you are badly out of shape and it can not correct by just using the brakes.
The top rocker switch on the left column of switches on the center consol stack will say PSM OFF on it along with having a spot for a light to light up on the switch.
I had it on my C2 and it saved my bacon a number of times. As this was my first P-car my experience driving with PSM allowed me to get to the point where it never interfered. I was much smoother and I now better understood what the car could/would do!
I just got a GT3 and it does not have PSM. I gonna hafta be smooth and drive within my, and the car's, limits! My limits are considerably less then the GT3s!!
I would order it again. After all....you can turn it off if you have one. You can't turn one on if you don't!!
on normal road i'm all for it - on the track it sucks - interfering when you are counter steering very near the limit or left foot braking. i kill it on the track except in the wet where it works pretty well actually.
In the 99' it is totally defeat-able in the throttle by wire cars it is not (reactivates when you touch the brake, as it did in my 01 boxster).
everybody drives different and in 95% of the cases it'll save your butt - & worth having.
my 2 cents..
For the street, PSM is a no-brainer IMHO. Get it if you can find a car with it. It's cheap insurance. PSM can do things that
you can't
like brake wheels independently and rapidly retard throttle. It'll react faster and regain composure of the car before you can say, "OH SHEET!"
and that's a good thing when it's 2 am and you're cruising home in drizzle and some moe-foe suddenly pulls out in front of you.
PSM learns as you go. Drive like an idiot and it reels you in. Drive smooth and it gives you more rope. I track my cab with it and find that PSM is just fine. It allows a fair amount of slide before stepping in... and that's with it turned "on". Defeat it and you get even more slack, but it will try and save you, even if it's turned off, when you're totally out of control.
If you're a track hound and are into 4 wheel drifting and full counter steer under hard throttle then PSM isn't for you. Otherwise, I think it's a great system.
Contrary to CupCar#12's comment, I left foot brake in my cab without any issues (throttle retardation).
Cheers
PSM was only available in the C4 (which was an e-gas car) in 1999. Traction Control (not PSM) was available in the C2's (which did not have e-gas) in 99.
