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YOUR RESEARCHPSM - Newbie questions
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Install with psm and a mechanical limited slip differential (lsd)
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Performed · outcome unconfirmed
The 996 GT-2 and GT-3 were never offered with PSM, and only one 996 model, the Anniversary in model year 2004, was ever fitted with PSM and a mechanical limited slip differential (LSD), but it was a special low level 22/27% knock version.
Leading evidence: 'Install with psm and a mechanical limited slip differential (lsd)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust brakes while driving' (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.
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Suggestion
That being said, Ive never felt PSM adjust the brakes while driving on the street.
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Suggestion · Original poster
You could also check the dash for the PSM button...
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.
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Install with psm and a mechanical limited slip differential (lsd)
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The 996 GT-2 and GT-3 were never offered with PSM, and only one 996 model, the Anniversary in model year 2004, was ever fitted with PSM and a mechanical limited slip differential (LSD), but it was a special low level 22/27% knock version.
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T053112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Question: Does PSM freak anyone else out when it kicks in, or am I doing it wrong? When the suspension gets light while cresting during a rising turn, PSM thinks I'm understeering and hits the inside front brake, scaring the crap out of me and attempting to point the car at the nearest wall. This is my first 911 and first car with PSM, so I'm not sure how much it is excessive nannying, or if I'm really not driving correctly and it feels like I'm in immediate danger of dying. I took this corner at 1.5x the speed in my Boxster for years without feeling that I was on the ragged edge of fiery death.
Should PSM be disabled for anything except the most conservative driving, or do I need to really dial back the speed entering turns, much moreso than I needed to in the Boxster?
Obligatory pic of my "new" baby:
I've never had the PSM on my car do anything like that. In general, I've only heard people say that it has helped save their bacon on rare occasions. Sounds like something is going on other than a properly functioning PSM.
Ummm... he said that the car is a C4, not a C2...
I have never felt the PSM kick in except in really rainy, icy or snowy conditions. I think that it is rare that it would engage even under normal spirited driving. A couple of years ago I when I first got my C4, I took it out in about 4 inches of fresh snow and played with the PSM. I can tell you that the PSM made all the difference in the snow! At low speeds with it off, the car was very unpredictable. With it on, the car was a delight to drive. Incidentally, the C4 is one of the best snow cars around, with proper tires (except for clearance) and I am sure that I will now get death threats from WRX owners...
The 911 is slower in and faster out than the Boxter. PSM will kick in in the situation you describe, but if you turn it off in that situation you need to be ready for the rear-end to swing around on you.
With all the weight in the rear, if the rear gets light in a turn, it will want to come around on you. Simple physics. The key is to keep downforce on the rear through a turn.
My suggestion is to keep the PSM on until you get used to the new dynamics. It will tell you when you are doing it wrong.
From "Porsche 996 The Essential Companion" page 299:
PSM was originally installed as standard in the model year 1999 996 Carerra 4 Coupe and Cabriolet models only. However, it was available as an option for the rear wheel drive Carrera model range (option M476), but the cost was prohibitive because, along with the PSM system, came a different engine, e-gas and a new engine management software version.
PSM was a standard installation only for all-wheel drive 996 models be they normally aspirated or turbocharged.
The 996 GT-2 and GT-3 were never offered with PSM, and only one 996 model, the Anniversary in model year 2004, was ever fitted with PSM and a mechanical limited slip differential (LSD), but it was a special low level 22/27% knock version.
So there you have the information!
PSM does spooky things... Ive said this since I first started tracking my car. The first thing i do before i leave the pits is switch it OFF. High speed sweepers can trigger the brakes if the car begins to push a little. That being said, Ive never felt PSM adjust the brakes while driving on the street.
Agreed! When I forget to disable PSM on the track I am reminded very quickly!
I never notice on the street except for when I get a new set of front or rear tires. Last time I got new fronts the PSM was very sensitive and kicking in on one specific low speed turn on my work commute. It stopped after getting a few miles on the new tires though.
Thanks for the comments. San Diego Region is doing their annual performance driving school. I signed up a couple of days after I bought the car - I want to spend as much time as possible on the skidpad getting a feel for how the 911 rotates compared to the Boxster.
With PSM off in the same spot, I can feel the car's urge to rotate, but it doesn't feel anywhere near letting go. That said, I'll stay on the safe side until I get used to having the motor hanging out back.
The tires I'm currently running (I don't have the specs handy) have essentially no sidewall. They definitely make the ABS twitchier than it was in my Boxster, even in low-speed straight-line braking. A cigarette butt or gum wrapper is enough to make the ABS perk up with these wagon wheels...
This is a source reference. Confirm exact model applicability in the original material.
