Anyone regularly drive with PSM disengaged? If so, what handling dynamic differences have you noticed most? I've played around a little in town here and there and have noticed better low speed maneuvering and perhaps better compliance over high frequency bumps. Could be my imagination...

 

PSM does not affect "low speed maneuvering [or] compliance over high frequency bumps." Are you talking about PSM (stability management) or PASM (active suspension)?

 

PSM (stability management). Probably should have said low speed maneuvering over a very bumpy surface. Still, the question more pertains to others deactivating it regularly and what they've noticed.

 

PSM has no effect on low speed maneuvering or suspension compliance. PSM off turns off stability brake corrections, until brakes are engaged, nothing else. And you would only feel its absence when the car is sliding.

SC Sport and Sport Plus buttons affect engine management,PSM levels and yes, PASM brackets.

 

[QUOTE=adias;3682131]PSM has no effect on low speed maneuvering or suspension compliance. PSM off turns off stability brake corrections, until brakes are engaged, nothing else./QUOTE]

I know it doesn't directly, but braking inputs from PSM do affect low speed maneuvering when rapidly changing direction. I've seen demos all in 2nd gear on a wavey (sharp undulations) closed circuit and with PSM engaged the car was difficult to drive hard and drivers (professional) all stated the car was far less maneuverable.

Perhaps my use of "slow speed" confused. I still meant normal driving with a tad bit of aggressiveness. I just didn't want to get into the territory of speeds above lawful limits.

 

Again, curious if any regularly dispense with PSM while driving normally and what their impressions are.

If no one does, that's cool. We can get back to discussions on the cost of brake pads at Porsche dealers and Vorsteiner product fitment issues

 

That goes against what PSDS top instructors tell me. They drive aggressively/spiritedly - I've been a passenger on fast hot lap demos - and PSM never intervenes. Of course, aggressive/spirited driving is not unsettled driving.

 

on a skidpad PSM on and PSM off make quite a difference (an exercise at PSDS in alabama). On a local track skidpad it is almost impossible to spin a C4S without turning off PSM. My GT3 doesn't have PSM just traction control but that is still more than a 996GT3.

 

Bingo!

 

I'm afraid not. I would have to be doing something very specialized to care because PSM never activates in my driving. I managed to light it up once: the first time I did a standing start in my then-new 997, I laid a fair bit of rubber because I underestimated the torque of the DFI engine. Axle tramp began and PSM engaged about the same time I backed off the throttle to let the tires hook up.

Other than that one situation, I've never had PSM engage, street or track, dry or rain.

Gary

 

Boy, I'd hope so. That is what PSM is designed to prevent. But I haven't done a spin intentional or otherwise but perhaps half a dozen times in fifty years. Occasionally a student made one seem imminent, but always caught it, so I can't even tally any as PIC-in-right-seat.

Do we count snap turns, also known as "handbrake turns"? I did a lot of those, but a controlled whip reversal shouldn't go against my spin count in sports car heaven, should it?

Gary