Guys, given the recent debates over PASM, Sports Chassis and everything, I thought I'd step-in with some facts from the 997 product manual.
Porsche Active Suspension Management (PASM) includes 4 map controlled dampers with continuously adjustable damping force (each with one bypass valve). PASM selects the required damper hardness for each individual wheel from a precisely co-ordinated map in both the normal and sport programs. There are 8 programs, normal and sport each use 5 so there is some overlap i.e. the hardest normal is harder than the softest sport. PASM control unit selects the damping force for each wheel based on information from the two acceleration sensors, one at the damper dome front-right and one rear left, in addition to signals such as lateral acceleration, steering angle, travel-speed, brake pressure, engine torque etc provided by the CAN bus...
There is a graphic comparing the damping force and speed to both the sports chassis (-20mm) and the standard chassis, and naturally the PASM offers far greater hardness than the sport chassis and far softer than the standard. I wish I had a scanner to show you !
The PASM is available on 18" or 19" wheels and is -10mm over the standard chassis.
Sports Chassis -20mm with mechanical differential lock is available on Carrera and Carrera S only with 19" wheels and manual gearbox. -20mm over the standard chassis (i.e. -10mm over PASM). Is intended for customers who choose to sacrifice comfort for agility...the chassis has an uncompromisingly sporting design, sportier even than PASM in Sport !
This has been achieved through selection of more rigid spring AND damper set-up and the mechanical rear diff lock. Stronger stabilisers front and rear (anti-roll bars ??) are also a contributing factor.
Despite the extremely sporty set-up and 19" wheels...offers a level of comfort comparable to the sport chassis (-10mm) of 996 Carrera 04. An important component is the mechanical differential lock with asymmetric split (22% in traction, 27% in overrun)...offering the following advantages: more traction when accelerating out of corners for sporty driving behaviour and more neutral driving behaviour with less understeer in extreme cornering situations.
And so on...!
Porsche Active Suspension Management (PASM) includes 4 map controlled dampers with continuously adjustable damping force (each with one bypass valve). PASM selects the required damper hardness for each individual wheel from a precisely co-ordinated map in both the normal and sport programs. There are 8 programs, normal and sport each use 5 so there is some overlap i.e. the hardest normal is harder than the softest sport. PASM control unit selects the damping force for each wheel based on information from the two acceleration sensors, one at the damper dome front-right and one rear left, in addition to signals such as lateral acceleration, steering angle, travel-speed, brake pressure, engine torque etc provided by the CAN bus...
There is a graphic comparing the damping force and speed to both the sports chassis (-20mm) and the standard chassis, and naturally the PASM offers far greater hardness than the sport chassis and far softer than the standard. I wish I had a scanner to show you !
The PASM is available on 18" or 19" wheels and is -10mm over the standard chassis.
Sports Chassis -20mm with mechanical differential lock is available on Carrera and Carrera S only with 19" wheels and manual gearbox. -20mm over the standard chassis (i.e. -10mm over PASM). Is intended for customers who choose to sacrifice comfort for agility...the chassis has an uncompromisingly sporting design, sportier even than PASM in Sport !
This has been achieved through selection of more rigid spring AND damper set-up and the mechanical rear diff lock. Stronger stabilisers front and rear (anti-roll bars ??) are also a contributing factor.
Despite the extremely sporty set-up and 19" wheels...offers a level of comfort comparable to the sport chassis (-10mm) of 996 Carrera 04. An important component is the mechanical differential lock with asymmetric split (22% in traction, 27% in overrun)...offering the following advantages: more traction when accelerating out of corners for sporty driving behaviour and more neutral driving behaviour with less understeer in extreme cornering situations.
And so on...!
