"We always send Brian out with as few variables as possible," says the Principal and owner of San Jose BMW. "The tires are always the same temperature, tire pressure is accurate to within half a pound and there is always the same amount of fuel in the tank. Every time Brian comes in, we check the rise in tire pressure, look at tire wear and check the amount of fuel used. When these variables are controlled and the results are consistent, changes can be tried and results evaluated. As race day approaches the variables are reduced and the changes more subtle so Brian can become accustomed to the feel of the bike and the way it reacts at speed on the track. On race day, there are no changes made to the bike - just fresh tires, enough fuel to make it to the finish line and a final check of all bolts, fasteners and cables."