Originally Posted by home7271

The difference in ultimate grip between a PDCC and a non-PDCC 991 should be very small, if any at all.

I think a casual driver tend to use roll to 'sense' the limit of the tires. A better driver can 'feel' the grips change as the tires approach and exceed their limits.

However, rolls have a lot to do with transient responses, especially when a car goes through a quick left/right. There is actually a time lag between the steering input and the loading of the outside tires. When the body rolls a lot, it take longer for the outside tires to load up to steer the car.

I am pretty sure this is where the PDCC helps the most...it minimizes the lag between the steering input and the loading of the outside tires. This in itself may not make the car faster, ie, you can compensate for the lag by steering 'ahead' of the curve, but it should be much more precise and precision improves lap times.

Just my thoughts.

Originally Posted by ChuckJ

Seems like it keeps all the geometry at optimal settings which would have to improve traction. I would think you would have to be a great driver to beat a good one who was using PDCC.

ChuckJ

Originally Posted by home7271

In addition to my earlier post, another area wrt transient/dynamic responses where PDCC would help a lot, is in dealing with bumpy corners. PDCC being an active system, will cope with bumpy corners much better than any passive systems and therefore faster lap times.

I am sure PDCC is a great system but for most enthusiasts, the same money going towards driver training will easily make up for the time gained by PDCC.

Just my thoughts.

Originally Posted by ChuckJ

Intuitively it seems to me that anything that improves grip in a corner (which I’m sure PDCC does) is good, but I have a concern if the transition from grip to slip is abrupt. I doubt that is the case with PDCC, but I’m very interested in hearing from our track savvy guys the nature of the failure mode.

ChuckJ