The bumps were playing havoc on the aero as well, the car was slamming through the travel and our classified under-car aero was getting damaged. To mitigate this, we adjusted the shocks high-speed compression damping and raised the ride height by 10mm. This helped a lot. Dai didn’t like how the compression adjustment made the car turn in super sharply so I dialed it back a little. By our last run, the car was still not great over the bumps but much better. A car built for downforce is never going to be super good over bumps and the bumps were so bad it was bumpy in a stock rental car. This is how good our KW motorsports shocks are, stiff with good pitch control for aero stability yet capable of handling pretty big bumps at a low ride height.
This was Dai’s first time up this part of the mountain at speed as it was closed due to snow during prerunning the week before.
This part of the course is a mixture of fast sweepers and a few tight hairpin switchbacks.
So for our first day, we were reasonably fast in the top third of the cars but were a little disappointed with our speed. In the real event, our tires would be much warmer from the run-up to this point though and Kelvin was continually refining our traction control to suit the corse. The tuning of the traction control was pretty critical and very helpful for the management of the rear tires. Kelvin got it so the car would kind of surf the traction control limit and Dai could modulate the throttle to hold it there and not affect the balance of the car.
So we returned to the house and prepped the car, the big thing was repairing the undercar aero devices. Dai was disappointed at his time so he wanted to take a support vehicle and make some recon runs to figure out some new lines to miss the bigger bumps. I wanted to go to measure the pavement temps so I would get a better idea what the surface might be like on race day.
The rest of the crew wanted to go to the summit too to see what it is like. So we all piled into our support vehicles and did some sightseeing. This is the climb from the midpoint to the devil’s playground. Look how high it is! Look how far down you fly if you mess up!