For anybody who's interested, I've done some 9 lap runs at Kyalami in the BRM to see what a good pace should be. Obviously thats about 1/3 of a race distance.
I've used my times to estimate a few things about race pace for a full distance. A good time from a standing start is about 1m28.00, and then the race pace should begin in the mid-22s for the first couple of laps before settling into the 1m21.5 to 1m22.5 range for the second third. In the final 9 laps consistent 1m21s should be possible, with a few laps towards the end into the 1m20s.
FWIW, my best standing start time on 9 laps fuel was 1m27.40, and my best overall time (bearing in mind I was trying to keep it on track the whole time) was a 1m20.98.
The penalty for running wide onto the grass without a spin is pretty steep, you lose about 3 to 5 seconds.
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