The Porsche Active Suspension Management, or PASM, was one of the first active chassis systems that Porsche deployed and is still being improved upon today. This blends two chassis into one: a very sporty chassis for the race track and a sporty yet comfortable chassis for extended trips. When the car is driven more energetically, the dampers’ default setting, which is more comfortable, shifts to a sportier mode. This improves comfort, especially on lengthy highway drives, as the PASM greatly outperforms a passive chassis at absorbing mild to moderate road surface imperfections. The sport option, in contrast, activates stiffer damper characteristics that support a more nimble driving style. On the race circuit, achieving quick lap times is made simpler by the reduced body movement of the automobile.
When driving, the PASM reacts instantly to dynamic changes. In the event of sudden steering movements, such as those made unexpectedly to avoid an impediment, the system, for instance, boosts damper force to both axles. This lessens the body’s lateral inclination or instability and makes controlling the vehicle much simpler, especially under difficult circumstances. When operating in normal mode, the damper force is increased whenever the body’s vertical movement exceeds a predetermined threshold, such as when driving over potholes in the road. This effectively stops the vehicle body from becoming unstable. Sport mode, in contrast, marginally lessens the damper force when vehicle body movements increase to enhance wheel-to-road contact. This keeps the automobile from leaping or moving around while also considerably enhancing comfort. When cornering in normal mode, the damper force is set differently for the inner side and outer side of the car based on the vehicle speed and lateral acceleration. In addition to preventing vehicle instability, this greatly improves driving accuracy. When the accelerator pedal is removed, during gear changes, and during hard acceleration, the damper characteristics are independently modified for the front and rear axles.
In This Article...
Porsche Active Suspension Management explained in terms of technology
Since 2005, the 911 Carrera S has come equipped as standard with Porsche Active Suspension Management (PASM). The method offers two benefits that frequently seem to be at odds with one another: improved grip and increased comfort.
A PASM damper resembles its conventional sister almost exactly from the outside, with the exception of the control wire attached to the unit’s head. The PASM damper’s secret is hinted at by this control wire.
On a Porsche 911 with PASM, all four dampers are connected to a central control unit. An army of sensors activates when you press the PASM button.
These sensors track variables like suspension bump, body roll, and steering input. The information is relayed back to the control unit together with two accelerometers, where the PASM system decides whether to stay in “Normal” mode or switch to “Sport.”
The dampers become stiffer in “Sport” mode, improving cornering performance by keeping the tyres in touch with the pavement.
A unique bypass channel is used inside the damper body to vary the stiffness of the suspension in order to achieve this modification.
The basic operation of hydraulic dampers is the same: oil is pumped into the damper body and compressed by a piston. The bypass channel of the PASM damper is used to regulate the oil flow.
The channel control valves are open in “Normal” mode, allowing a larger flow of oil and a softer damper as a result. The bypass channel is shut off when the “Sport” mode is engaged. This makes the damper firmer and the Porsche more responsive by increasing the compression required to drive the oil through the damper body.
The first part of your selections is Porsche Active Suspension Management.
PASM shocks have continuously variable damping rates that respond to the driver’s style and the state of the road. The ECU receives data from sensors at each wheel and uses it to change the fluid level in each shock to firm up or soften it. photo courtesy of P
You’ve decided on the Porsche you want to purchase, but you’re not sure which performance-enhancing features to look for. The fact that many of the most well-liked and practical factory performance modifications, such as ceramic composite brakes, electronic anti-roll bars, and air suspension, are extremely expensive adds to the difficulty of the situation. How can you tell which choices are best for you?
When you arrive at the dealership to take a test drive, be ready: Become informed. Knowing what you need and what you desire depends on your understanding of the functioning of the many optional pieces of equipment. If you are clear on what you need in a Porsche, you can specify the model that best suits your needs while remaining within your price range. To assist you, we’ve compiled a list of the five performance options that we believe offer the best value for the money, along with information on their costs and functions. Keep an eye on Of Note since we’ll be releasing them one at a time over the next few weeks!
PASM is a standard feature on certain of Porsche’s high-performance vehicles, including the Carrera S, Panamera Turbo, and Cayenne Turbo. However, if you have your heart set on a model that doesn’t come with it as standard, think about the electronically controlled suspension.
The PASM shocks have continually variable damping rates that react to driving style and road conditions in addition to lowering cars equipped with them by 10 millimeters. The ECU receives data from sensors at each wheel and uses it to change the fluid level in each shock to firm up or soften it. Depending on the model type and its specification, we often rate Porsche’s PASM suspension on any of its vehicles as outstanding to superb.
By pressing a button, the driver can select from a variety of PASM settings that modify the shocks’ predetermined damping force. For instance, when a 911 is driven in PASM’s Normal mode, the shocks are milder; when Sport is selected, the shocks are firmer for a livelier ride and improved stability.
Porsche does offer Sport PASM on the 911 if you desire an even sportier ride than what regular PASM gives. It sports updated front and rear spoilers, harder anti-roll bars, and shorter, firmer springs that lower the car further 10 millimeters. The Sport PASM bundle also comes with PTV or PTV Plus.
Porsche – Describe PASM. How PASM functions What does it resemble?
The Porsche tightens its muscles and changes from being a jogging to a sprinter or a marathon runner, depending on the car and the driver’s wish, when you click the PASM / Suspension (small shock picture) button. The Porsche Active Suspension Management, or PASM, allows drivers to adjust the tune of their active shock absorber system at the push of a button.
The act of pressing the button starts a series of events. The Panamera and Cayenne’s PASM control unit begins by looking for the proper control map, either Normal, Sport, or Comfort. It then queries its sensor network to determine how the car is currently being driven. The control unit makes decisions using that data.
on how to adjust the shock absorbers. Hydraulic vibration dampers, whose characteristics may be adjusted in a matter of milliseconds, are the real PASM heroes.
Traditional shock absorbers’ job is thankless. If the car is set up for comfort, the swaying and rocking motion it exhibits in sharp turns can quickly deprive the driver of their enjoyment of the road. On the other hand, tightly calibrated dampers deliver sports-car characteristics but swiftly cause passenger sighs at every bump in the road. Any middle ground between the two may be chosen, but choosing both at once is not an option. However, a PASM shock absorber is capable of any type of damping, including gentle, harsh, comfort-oriented, and anything in between.
Here is a quick overview of the physics. Modern conventional shock absorbers operate on a consistent principle: an oil-filled cylinder attached to the wheel suspension houses a piston connected to the automobile body by a piston rod. Oil is forced through the piston’s bores during each movement, allowing it to brake and absorb shocks. The damping effect is firm if only a tiny amount of oil can pass through narrow bores. The damper has soft, comfort-focused features if the bores permit larger throughput.
The oil flow can be changed using active PASM dampers. They accomplish this using a bypass channel with an electronically operated valve that can open, constantly narrow the channel, or close it in a matter of milliseconds. In order to best accommodate driving requirements at any given moment, the control unit may continually regulate the valve adjustment on each wheel.
Drivers can specify the type of tune they want for all four shock absorbers by pushing the PASM (small picture of the shock) button. The piston (below) with an incorporated changeable slotted valve is the system’s beating heart. The oil flow into the middle bypass channel is continuously controlled by a control motor.
Do I have PASM on my Porsche?
The FAQ will answer all of your queries if you click on the underlined terms in this page for PASM or Sport Chrono.
In conclusion, both sport chrono and sport chrono without PAM are valid options. For each, there is a different button. If you have a PASM button (which resembles a shock), you have PASM; if you don’t, you don’t. The button is considerably simpler to find than wires coming out of shock towers, which can also be checked.
Describe Porsche PCM.
The central control module for all audio, communication, navigation, and basic vehicle operations in your Porsche is called the Porsche Communication Management, or PCM. The PCM system has a sizable touchscreen display with high resolution for simple and practical usage.
PASM dial is what?
Program, aperture priority, shutter priority, and manual exposure modes are all referred to as PASM. Typically, your camera’s top left dial is where you’ll locate these options. You won’t have a PASM dial if you’re shooting Fuji because the camera determines the mode based on your choices.
Has 996 has PASM?
The option 996 was PSM (option 476). As a 997 option, PASM (actually standard on the Carrera S and optional on the base Carrera). The 997 comes standard with PSM. “Sport package 6-spd plus PASM” is a 987 Boxster option designated as P04.
Are PASM and air suspension the same thing?
PASM is a normal steel spring suspension with adjustable dampers fitted. They are computer-controlled to react in a way that adjusts to the state of the road. Additionally, they include three presets for general stiffness: comfort, sport, and sport+.
Air suspension uses the same computer logic as PASM on steel, but uses air shocks instead of steel (their is no air suspension without PASM). With air, you can also modify the ride height, and the adjustment range is greater (comfort mode on air is a touch softer than comfort mode on steel springs). The main disadvantage of air is that, if it fails outside of the guarantee period, repairs are far more expensive.
What is the purpose of the PASM button?
Drivers can specify the sort of tune they want for all four shock absorbers by pushing the PASM button on the control panel. The piston (in the circle) with an incorporated changeable slotted valve is the system’s brain.