We ran a KA100 there last year, and my guess is the VLR setup is probably quite similar. My notes say we ran 13-69 gearing. For reference, our lap time was 1:50:63. I would also test a 68 or even a 67, because in the last race of the weekend there was one driver who was faster than us on the straights, so we may have been not quite optimal. Its a super track, have fun!
