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Cayman CompetitionAuto Cross, Club Racing, DE, this is the place to discuss the Cayman on the track
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My 17 year old son and I ran my Cayman S at the PCA Golden Gate Region Autocross #5 on July 8th. As usual, it was a big field, nearly 120 Porsches, including 3 Caymans. I had my new HD camcorder on hand and took a bunch of video in and out of the car and you can see some selected edits on this web page. Cayman #149A & #149 is Sam (my son) and myself, #0 is Beez and #28 is Alan28. Alan got top time in the AX10 class and 13th overall, man he can move his Cayman!!
I'm afraid my handiwork on the wheel leaves a bit to be desired, and Sam was a bit uncertain about how hard to push his old man's new Porsche, but we both did OK, coming in about the middle of AX10. Starting to notice the lack of LSD more and more now, you can hear the inside wheel squealing on a couple of corner exits on the #149 inside-the-car segment.
I also tried some car-against-car split screen edits, and I think they turned out pretty well. Also did the course walk with my GPS unit and put the course into a racing simulator, there's also a shot of that on the video page.
Sam and I are off to the Zone 7 2-day AX school this weekend, at which Beez and Alan28 are instructing. It's astonishing how much fun we are getting out of this amazing car.
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
PCA - Porsche Club Of America
The Porsche Club of America - http://www.pca.org
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I've got a tip for you in how to help improve your autox times, and I should have mentioned this to beez. Try doing a run with PSM ON but during that run purposefully position the car to toss the rear end around the corners. I call it momentary drift for lack of a better term. I found that techique produced my fastest autox times in the Cayman but took some practice to get the feel for exactly how to do it. Of course this was on the course that I was running and autox courses all vary so depending on how many turns your course has and how tight they are will make a difference. I just found that instead of fighting the corner and producing wheel spin I would drift the corner, not produce spin, get on the gas sooner and turn better times to the point of where I was 2 seconds faster than a 944 Turbo S on race slicks (gutted race car, full cage, etc) on my street tires.
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
Dan: Autocrossing, also know in the States as Soloing, involves making timed runs on a temporary course marked out with cones on a big patch of bitumen or concrete, usually a parking lot or old airstrip. It's probably the safest form of auto competition, just you and the cones, nothing to run into, maximum speed usually around 60mph. All you need is a helmet. About the only damage you can do is getting cone scuffs and, of course, wearing out your tires.
The videos I posted were taken at a Porsche Club of America event at Alameda Point near Oakland, CA, on an abandoned Naval air station. I'd be very surprised if the Porsche clubs and other sports-car clubs in Britain don't run similar events. I highly recommend it.
Ken, thanks very much for the AX tips. 2 seconds sounds like just about what I need to catch Alan28 <g>!! I certainly feel as though I need the thing to be looser, it tends to push a lot, so some kind of rally-like flip could do the trick - I'll certainly try it. I'm just getting a bit of negative camber done on the fronts today at Reitmeirs in Los Altos, for the upcoming AX course. Were you running Cups or PS2s and did you tweak the rear presssures to help initiating the drift?
Regarding the split-screen editing, I'm sure Vegas can do the same thing. I set it up as 2 video layers, then cropped the bottom off the top layer and pushed it up a bit, then pushed the lower layer down a bit. At that point I could see both videos, so I could align them at some obvious common point, such as the fronts crossing an apex cone.
Linear Mode
