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ข้อความ:: [QUOTE="Dr. Jeff Harper, post: 1020088, member: 22311"]Well . . . . . . after a month . . . nobody knew what this guy was doing. Here is the answer: the crew member is using a device to test how sticky the track is at various points on the drag strip.  This is a new practice in The States at the national event level.  The device assigns a numerical value to the degree of track stickiness so that the crew chief can determine how much clutch slippage to dial in.  This is a process of tuning the race car to the particular track they are racing on . . . and with top fuel dragsters and nitro funny cars now making 8000 horsepower . . . . it is very important.[/QUOTE]