Posts Tagged ‘motor racing’

No point in having a speedometer and a tachometer

Friday, July 31, 2009

This is what a tachometer looks like. Read an interesting article at Stock Car Science that talks about the science behind. The divisions on the gauge are 100 rpm. If the driver can read the gauge to 100 rpm, for a typical gear ratio (i.e. let’s say a 1.45:1 second gear and a 4.22 rear end gear), each 100 rpm step on the tach corresponds (for 82.1 inch circumference tires) to 1.37 mph. If you assume that the driver can read the tach to 50 rpm, that’s 0.64 mph. So for a driver, there’s really no point in having a speedometer and a tachometer. Now that Qrodo is going to be used to broadcast motor sports you will see more information about motor sports.


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