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Im New to AX. Should I run with the PSM on or off? First time out I had it on.
Thanks.
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
I can't imagine any reason to keep it on. It makes sense on the street. It might be good at an AX in the rain. But other than that Its just going to slow you down. When it kicks on in a tight turn, its going to prevent you from sliding the back end around a corner.
read more here: site:caymanclub.net PSM on off - Google Search
__________________ CaymanS Track Videos 2004 996GT3 / 2007 CaymanS / 2008 SLK350 / 2007 Cayman S Track Car (Modified with parts from: 997GT3, 996GT3, 997GT3RS, Porsche Motorsport, Tarrett, Mantis, Arlan, AP Racing, Moton, Eibach, Tubi, Aasco, Sharkwerks, Quaife, TC Design, Heigo, Fikse, Softronic, TeamTech, Traqmate, SVtek, ChaseCam, Pagid, Rennline, Hooiser, Motul) Complete Mod List and Setup Info
Im New to AX. Should I run with the PSM on or off? First time out I had it on.
Thanks.
You should probably run with it on until you get more comfortable with the car and with driving AX. You'll know when it's time to turn it off when you start to feel it interfere with your driving, instead of just saving your butt.
One thing you could try is to do the first couple of runs with PSM on and then the last run or two with it off. Then, compare the times. If the "off" times are the same as, or faster than, the "on" times, then it's time to turn it off.
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
Definetly Off, but if you are not driving hard enough, you may not notice it should you choose to leave it on. So, did you feel anything odd? If not, then you need to push harder
If you get wheel spin, which our cars are prone to do, it will intervene by cutting the throttle...it will feel like fuel starvation. In cornering situations, it will both cut the throttle and apply braking.
I think it might be useful on the first run when your tires are cold, and you are learning the course. If you go in too hard it will save your run from being totally trashed by a spin. Turn it off after that.
__________________
996 GT3 lower control arms at all corners
997 GT3 front sway bar
Tarett rear toe links
Quaife TBD
DMC harness bar/G-force harness
I like to be the contrarian so here is my view on it.
After much tinkering I discovered that the fastest time around the autox course that I was running (fairly tight and about a 50 second course) that my fastest times were by learning how to set the car up with momentary drift with PSM ON. With PSM OFF I tended to go beyond the point of momentary drift and waste time. With PSM ON I could keep pressing and pressing getting the max of the momentary drift until PSM would kick in and cut power and/or brake for me. This allowed me to explore maximum grip before losing traction to the point where PSM would kick in. The key is that you can do a small amount of drift and car setup at the edge just before PSM kicks in and I found that my times were fastest right at that razor edge. I turned off PSM and for the most part could still drive around that edge but found myself with a tedency to go over that edge too much, not set the car up as well, and consequently not achieve as good of times. Keep in mind this was on street tires, and using track tires would obviously shift your grip out to where you probably have to turn PSM off altogether to push the grip envelope further. Also note I did my runs in SPORT mode which further retards PSM.
So in essence I do agree with others above who have said that you need to test it, but I would also say that whether it needs to be on or off for your best times will depend on a variety of circumstances and that there is no one right answer for all conditions.
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
I'm gonna vote with Ken here. Certainly while learning I'd leave it on, then later, when you're comfortable, try turning it off. While the loss of throttle when exiting a corner has vexed us all before going to a TBD or LSD, the subtle single wheel ABS interventions when your just a bit off in entry and mid corner make up for it until you're comfortable with oversteer and spin control. On most tracks I'm faster with it off, but I have found a few conditions where I waste too much time drifting with it off.
Greg
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
Ok so I guess there is no right or wrong way. Just suck it and see. I thought I would have got a bit of instruction at the time but did not. I think I felt the PSM come one a few times although I was too intent at looking ahead and just concentrating on where I was going, so did not notice any flashing green lights on the dash. ABS came on for sure a couple of times.
Man trying to remember the course through a sea of cones is the bigger challenge I think. That gives me a headache and I dont get headaches!
Next time I may install a camera and see what happened after, and re live the moment again.
I figure not having a LSD or TBD is a major disadvantage at AX events? I wonder how many seconds such may be worth.
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, y
