Week 1 HPDE and the stuck throttle
One of the first things I did (one week into ownership) was take it to our local track (Atlantic Motorsports Park) for a one day HPDE. Call me crazy, but I figured there was no safer place to learn a new car. A buddy that has a sc 3.6 conversion showed me the ropes and I felt out the car. It was touchy with understeer and oversteer during my first session. After, I checked the tire pressures and realized my pressures were way too high (45 hot, I did not bother check prior to this first run).
After I got the pressures out of the stratosphere the car had no understeer and was quite neutral. I aimed for 34 hot. It was a real pleasure to drive, but I admit that I focused more on smoothness and really only ran 6/10, maybe 8/10 max. It really is a pleasure to drive and the 915 was fast and precise. It was a fun and challenging car to drive well, which is what I want in a car. Drive well and speed comes. Drive poorly, and don't expect the car to cover up for your mistakes. The fact that my car kind of wants to kill me if I drive poorly really appeals to me.
The car really blew away my expectations and oozed personality. The unique handling and feel really had me smitten.
I did have a few episodes of unintended acceleration. After coming off the hard throttle on the front or back straights I would occasionally (x4 through the day) get the throttle sticking slightly. As such I would go into my braking zones with a split second more throttle that desired. It happened at the end of the day while I was showing a WRX STI to "respect your elders." Gave me a bit of a scare and I had to pull off a save, coming what felt like inches from the grass in a key braking zone at the end of the fastest part of the track. I called it quits (but the day was done anyway). I ruled out the floor mats, and driver error. Winter project I guess. I lubed everything up and I ordered new springs. I am looking into the common causes including the cruise control.
Back to the sound, my dad was there and took the on track photos above (and has the white z4 M coupe). He originally was on my case to swap in a stock exhaust (he has an OEM mentality). After hearing it in full song he said it sounded more like a V8 than the V8's. He never since has advised an exhaust swap. He is quite impressed by the car.