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+1. I actually commented on this to my husband the other day, how relatively small wheel movements almost feel overrepresented at highway speeds. Two factors I suspect were at play: 1) I recently switched from the factory Goodyears to Michelin PS4S and 2) at the time I hadn't lowered my tire pressures back to the comfort pressure level, since the dealer filled them up to the door sill pressures.
Agree, but I think RAS also makes a huge difference
Originally Posted by kaylie
BMW has a button u can push to firm up steering.
Yeah, but I’ve owned 3 BMWs (Z4, 335, & 435) all with sport suspensions/packages, and the steering feel was just horrible in or out of Sport mode. Most people would have learned without having to buy 3 cars!
It seems my tires are overfilled maybe I will release some air.
What pressures are you running? There are three pressures settings you can choose from. I’d recommend trying the lowest “Comfort” setting first. Just make sure to set them in the morning, when the tires are completely cold.
Have the alignment checked.
To little, or even a positive Toe adjustment will make the steering feel twitchy. Useful for autocross but not so much for real world driving.
Caster angle will change the "On-Center" feel of the steering, which many owners will describe as being to heavy or to light. Increasing the Caster Angle will increase the "On-Center" feel and to make the steering heavier. To much Caster Angle and the outboard edges of the front tires will begin to develop a "cupping" wear pattern.
Have the alignment checked.
To little, or even a positive Toe adjustment will make the steering feel twitchy. Useful for autocross but not so much for real world driving.
Caster angle will change the "On-Center" feel of the steering, which many owners will describe as being to heavy or to light. Increasing the Caster Angle will increase the "On-Center" feel and to make the steering heavier. To much Caster Angle and the outboard edges of the front tires will begin to develop a "cupping" wear pattern.
Front Suspension, Caster and Camber Angles are adjusted where the top of the McPherson Strut is bolted to the body. See the attached picture.
Porsche provides for a significant amount of range for the Camber Angle adjustment and very little for Caster Adjustment when stock. Notice the oblong shape of the holes that can be seen where the three Adjustment Studs/Nuts come through the frame/body of the car.
Now, the adjustment holes can be modified (within reason) in order to provide additional Caster Adjustment Angle Range. However, short of modifications for competition reasons, falling outside of the range specification Porsche specifies and not having sufficient Range within the original holes generally indicates frame damage and/or an Alignment Machine that is out of calibration or an inexperienced Technician operating the Alignment Machine.
For really serious competition there are aftermarket manufacturers that can supply what are typically called "Camber Adjustment Plates" which replace the section of the body that had the original mounting locations. Not something I would do on a street car.
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I managed to change the steering feel, with different effort between sport and sport+, by programming it using PIWIS. I no longer have the car to pinpoint which module but I left a screen capture and description on the "coding 992" thread. Sorry that one is a bit long.
It seems to make a difference, the steering became more direct and quite different in sport and sport+.
Front Suspension, Caster and Camber Angles are adjusted where the top of the McPherson Strut is bolted to the body. See the attached picture.
Porsche provides for a significant amount of range for the Camber Angle adjustment and very little for Caster Adjustment when stock. Notice the oblong shape of the holes that can be seen where the three Adjustment Studs/Nuts come through the frame/body of the car.
Now, the adjustment holes can be modified (within reason) in order to provide additional Caster Adjustment Angle Range. However, short of modifications for competition reasons, falling outside of the range specification Porsche specifies and not having sufficient Range within the original holes generally indicates frame damage and/or an Alignment Machine that is out of calibration or an inexperienced Technician operating the Alignment Machine.
For really serious competition there are aftermarket manufacturers that can supply what are typically called "Camber Adjustment Plates" which replace the section of the body that had the original mounting locations. Not something I would do on a street car.
.
Yes those slots only go left and right. Not forward and back. You would have to remove the strut and wallow out the mounting holes to "adjust" the caster. For practical purposes there is no caster adjustment on a stock 992 strut.
10-26-2022, 01:13 AM
