I replaced my 987.1 Cayman with a 987.2 version this past year, and have been learning the new car this track season. Initially, I was vexed by the fact that I was about a second slower in the 987.2, despite its horsepower advantage. Also, I noticed that the brake pedal was going soft late in the day, a problem I had not had with the 987.1. And, during bleeding, the rear brakes had an unusual amount of air in the lines. This was all happening despite the fact that I was running the car with the PSM switched off. Some searching on this forum revealed that Porsche does not allow PSM to be completely disabled with the switch, and that totally disabling all nannies required unplugging the yaw sensor. So, prior to my last outing last Friday, I unplugged the sensor, held my breath, and headed out on track. I was nervous because I didn't know what other effects might show up (for example, the cruise control stops working--not that I use that on track).
The car felt just fine without the nannies on, and I think it was quicker, though a GPS problem prevented me from getting lap times. The ABS still worked fine, and the brakes did not go soft as they had before. And-- the car actually got a bit loose while coming out of the slowest hairpin on the track when I romped on the throttle, something I had not experienced before. This all leads me to conclude that, unbeknownst to me, the rear brakes were still intervening quite a bit even though I thought PSM was off.
Overall, it was a fine result. The only downside was the fact that the car has a hysterical electronic panic attack when the nannies are turned off--I get a bunch of dire messages at start up, like "PSM failure!" and "Driver assist failure!" in addition to the "Flat tyre!" message I already get since the inflation pressures of my track tires are outside the normal window. The flat tire message is especially annoying, because, even if you toggle through it, it reoccurs at random times during a run session--distracting and disconcerting when beginning to brake from top speed. The car ends up wth the entire dashboard lighting up, with bells and chimes signaling imminent doom. When the low fuel warning light came on, I almost missed it, since it was practically buried in the throngs of other warnings.
I'm hoping to find a way to reprogram the computer to get rid of all these extraneous warnings and error messages. If anyone knows of a way to do this, I'd appreciate it. I suspect most shops will be jittery about doing it, for liability reasons, but I'll happily sign a waiver acknowledging that I take full responsibility for making the car into a virtual deathtrap.
Terry
The car felt just fine without the nannies on, and I think it was quicker, though a GPS problem prevented me from getting lap times. The ABS still worked fine, and the brakes did not go soft as they had before. And-- the car actually got a bit loose while coming out of the slowest hairpin on the track when I romped on the throttle, something I had not experienced before. This all leads me to conclude that, unbeknownst to me, the rear brakes were still intervening quite a bit even though I thought PSM was off.
Overall, it was a fine result. The only downside was the fact that the car has a hysterical electronic panic attack when the nannies are turned off--I get a bunch of dire messages at start up, like "PSM failure!" and "Driver assist failure!" in addition to the "Flat tyre!" message I already get since the inflation pressures of my track tires are outside the normal window. The flat tire message is especially annoying, because, even if you toggle through it, it reoccurs at random times during a run session--distracting and disconcerting when beginning to brake from top speed. The car ends up wth the entire dashboard lighting up, with bells and chimes signaling imminent doom. When the low fuel warning light came on, I almost missed it, since it was practically buried in the throngs of other warnings.
I'm hoping to find a way to reprogram the computer to get rid of all these extraneous warnings and error messages. If anyone knows of a way to do this, I'd appreciate it. I suspect most shops will be jittery about doing it, for liability reasons, but I'll happily sign a waiver acknowledging that I take full responsibility for making the car into a virtual deathtrap.
Terry