- #1

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Can you tell me if there is anyway of calculating the top speed in each gear of a vehicle given its horsepower and gear ratios?

Since Power = Force*Velocity

Velocity = Power/Force

Force = Drag Force + Rolling Resistance

--> Velocity = Power / (Drag Force + Rolling Resistance)

This does give me the top speed of the vehicle but it doesnt tell me what the top speed in each gear would be?

This is how I found the top speed in each gear before:

Prop Shaft speed = Engine RPM / Selected Gear Ratio

Wheel Speed = Prop shaft speed / Final Drive Ratio

Vehicle Speed = Wheel Speed * PI * Wheel Diameter

The problem with the above is that for overdrive gears it gives extremely inaccurate and high speeds.

Thanks