First track day in the M3. Car was 'almost' flawless. Weather Couldn't have been better despite the days either side looking pretty miserable. Still can't believe how much attention this car garners even surrounded by some pretty cool cars.
Some CSL airbox noises:
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We were just talking about how the car had been faultless before the second to last session and we must have jinxed it. I was getting a bit more comfortable in the later sessions and pedaling the car a bit harder. On the last lap of the second to last session I lost power steering mid corner and did the cool down lap with a plume of smoke coming out from underneath the car. When I came into the pits I could see it was power steering fluid that was on the undertray and assumed the high pressure rack lines had failed since mine were weeping a little bit already and I would call it a day. When I went to top the reservoir up to make the drive home I noticed it actually looked like the fluid had come out from underneath the cap and through the overflow hole. It was pretty clear the fluid had boiled. When I undid the cap to see what the level was at, the dipstick had completely melted off...
The power steering did return once the fluid had cooled down but it was clear on the drive home that the pump was toasted. It was whining under any kind of load and has probably had molten plastic pulled through it. I'm not really sure of the sequence of events, whether the pump failed and the bearing over heated which cooked the oil and the cap, or whether the oil boiled and caused the pump to fail. I have never heard of an E46 boiling power steering fluid while using ATF, I wasn't going sideways that much. Either way, looks like I'm gonna need to start buying some replacement parts..