You can download RC simulator here.

RC simulator ver6.4e simRC64e.xls (125kb)

This excel file uses macro function, that must be enabled at the opening of this file.

This simulator is to predict the fastest laptime of RC car with variable parameters. Calcularion is based on basic dynamics of acceleration, deceleration, and cornering profiles. These performance of a car is driven from motor power, tire grip, aerodynamic parameters, etc.

Details are here, but in Japanese, sorry.
You can try to translate with a site like here.

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