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Finding Engine torque value You must have Engine Torque and power curve data sheet, You can get this from engine manufacturer or from their website. Engine torque and power is mapped against Engine RPM. A typical example can be seen here. Torque curve sample Image
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Max permissible Tractive effort due to Ground Adhesion- TEGA To Calculate Max TE due to ground adhesion  you will need to have following data as input. Mue =Coefficient of friction between road and wheel =0.7 (Dry road) =0.4 (wet surface) GUV( Gross vehicle Weight)= 9500 Kg Formula: Tractive effort= GVW X Mue=9500 x 9.81 x 0.7 = 65236.5 N
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Calculating Torque at wheels In this blog we will see method to calculate torque produced at wheels you can calculate torque produced for any combination of Transmission ratio,transfer case or Axle ratio available with you. Following Inputs are required to perform the calculation. Inputs Required Engine Torque = 850 N-m Transmission Ratio=7.2:1 Transfer case Ratio=1.6:1 Axle Ratio=3.33 Torque at Wheels ( N-m) = Engine Torque X Transmission Ratio X Transfer case Ratio X Axle Ratio = 850  X  7.2  X  1.6   X  3.33 =32607 N-m
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