HanksRS - Wheel Torque Calculator (08/18/20) Rev1
Assumptions
Tune+ W400 kit = Estimated limit 400 lb-ft torque at the wheels. 93 octane
Estimated drivetrain losses (16%) = 400 lb-ft / 0.84 = 476.2 lb-ft.
These calculations are without regard to machine efficiency.
User Inputs
Estimated Engine Torque (T
_{e}
)
(lb-ft)
Tire Diameter
Note: 235/35R19 Michelin PSS = 25.5
Note: 275/35R18 RE-71R = 25.6
(inches)
Technical Inputs
Focus RS Gear Ratios (i
_{x}
)
1st
3.23
2nd
1.95
3rd
1.32
4th
1.03
5th
1.13
6th
0.94
Rev
1.42
Final Drive Ratio (i
_{o1}
)
4.06 (1st-4th)
Final Drive Ratio (i
_{o2}
)
2.95 (5th,6th,rev)
Conversions
1 lb-ft = 1.35582 N-m
1 N-m = 0.73756 lb-ft
1 m = 39.37007 in
1 in = 0.0254 m
1 N = 0.224809 lb-f
Calculations
Wheel Torque
T
_{w}
= (i
_{x}
* i
_{o}
* T
_{e}
) / 2
1st Gear
(N-m)
(lb-ft)
2nd Gear
(N-m)
(lb-ft)
3rd Gear
(N-m)
(lb-ft)
4th Gear
(N-m)
(lb-ft)
5th Gear
(N-m)
(lb-ft)
6th Gear
(N-m)
(lb-ft)
Rev Gear
(N-m)
(lb-ft)
Wheel Radius (r
_{w}
)
m
Wheel Force
F
_{w}
= (T
_{w}
/ r
_{w}
)
1st Gear
(N)
(lb-f)
2nd Gear
(N)
(lb-f)
3rd Gear
(N)
(lb-f)
4th Gear
(N)
(lb-f)
5th Gear
(N)
(lb-f)
6th Gear
(N)
(lb-f)
Rev Gear
(N)
(lb-f)