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Does anyone know the suspension geometry limits that Porsche use, i.e., min/max camber, min/max toe, min/max caster, min/max side-to-side difference all for front and back? I've seen several posts before, but they seem to be somewhat contradictory.
Is caster adjustable? What other adjustments are available?
Car is going in to OPC Reading for is first service and I'm getting them to check/adjust the geo. I'd like them to set it up to understeer a bit less. I know for a fact that the front off side camber is messed up; my camber gauge says it at +.25 degrees! Prolly been that way since delivery.
Anyone have a geo recommendation for mostly road use, standard (non PASM) suspension, 18" standard rims, Bridgestone RE050A tyres?
Thanks -nick
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
Does anyone know the suspension geometry limits that Porsche use, i.e., min/max camber, min/max toe, min/max caster, min/max side-to-side difference all for front and back? I've seen several posts before, but they seem to be somewhat contradictory.
Is caster adjustable? What other adjustments are available?
Car is going in to OPC Reading for is first service and I'm getting them to check/adjust the geo. I'd like them to set it up to understeer a bit less. I know for a fact that the front off side camber is messed up; my camber gauge says it at +.25 degrees! Prolly been that way since delivery.
Anyone have a geo recommendation for mostly road use, standard (non PASM) suspension, 18" standard rims, Bridgestone RE050A tyres?
Thanks -nick
as far as im aware castor non adj.
camber is via the strut mounts. the top retaining studs slide on slots.
you wont get much better than about 1degree - on the standard stuff.
bigger slots or differant top mounts required for more.
for fast road use id go for .75 degree - and a little toe in.
suits me / maybe not you = try it and see.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
The Porsche suspension spec ranges are:
Front camber: -.7 to +.3 deg.
Caster: 7.5 to 8.5 deg. (not independent; changes with other settings)
Front Toe: .00 to .08 deg. each side; total toe .00 to .17.
Rear camber: -1.8 to -.8 deg.
Rear Toe: .00 to .17 deg. each side; total toe .00 to .33
To reduce understeer, increase front tire pressures by 3 or 4#, set front toe near zero, camber near -1 degree, and/or slow down.
I don't believe increasing front pressure 3-4 psi would reduce understeer, sorry.
I have always run Michelin PS2 tires, and never really suffered any noticable understeer. Certainly NOTHING compared to the RS4. But then I have always liked to corner the CS with a little lift just before the apex to bring the rear round. Not for speed, but just for fun!
Until 
Suspension geometry
Linear Mode
