Had our first DE of the year today, temp in the upper 50's and a bit of rain so I kept the GY F1 Asy tires on instead of the half worn PS2 track tires. A few weeks back had the alignment changed by adding a more toe in the rear --from 04' to 17' and more Camber from -1.4 to -2.0. Not knowing the sweet spot for the air presure settings for this tire, I left them at what he PS2 starts at cold--35 F/ 37R.
The tires felt very grippy for the first 5-6 laps and then started getting skiddish; the rear left felt weird at high speed turns--almost soft--making me feel a little spooked about how far to take certain turns; I almost felt I had a weak shock and this was with
PASM in sport.. OTOH, the front end felt planted with good turn in.
Tried to check temps but with the wife's run group right after my run it was difficult to see what he pressure was at the end. When I had the chance to check her pressures, the rear was around 43 but after it had been setting for a bit. With the PS2's and old alignment settings the car understeered but never felt this twitchy.
I'll do another DE in 2 weeks with the PS2's to see if that changes things but I'm wondering about this alignment--would this amount of rear toe in affect handling significantly?
Thanks for any suggestions.
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PASM - Porsche Active Suspension Management
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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 |
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