Powertrain Sizing Tool
Size your EV powertrain from first principles. Enter vehicle weight, grade, speed, and drivetrain ratio: The tool calculates required torque and power and matches it against the full Dana TM4 SUMO range.
System Fitment / Motor Matching Tool
When active, easy / advanced inputs are ignored. Use this to size against an existing motor (e.g. replacing a diesel).
City Bus
Light Commercial
Dump Truck
Heavy Flatbed
Vehicle Weight
kg
VMAX
km/h
Grade
%
Tire Diameter
mm
Total Ratio
:1
Tyre OD 711 mm
Circumference 2233 mm
Application Defaults Light-Truck
Vehicle Parameters
Maximum weight expected during operation.
Standard tyre format, e.g. 205/65R15.
Drivetrain Configuration
Leave lowest empty if only diff is present.
Leave highest empty if direct drive selected.
Must be filled.
Rotational inertia factor is important for tall gear ratios.
Gearbox efficiency is typically 85–95% depending on type and operating point.
Limit due to battery or other practical limits. Enter a very high value such as 10000 to remove the power cap.
Requirements
Must.
Must.
Enter zero if not a requirement. Do not leave empty.
Enter zero if not a requirement. Do not leave empty.
Assumed at zero grade and lowest gear only.
Enter zero if not a requirement. Do not leave empty.
Calculated System Requirements
Required Max Torque @ Wheel: 5679.12 Nm
Required Max Speed @ Wheel: 668.81 RPM
Required Max Torque @ Motor: 1313.40 Nm
Required Max Speed @ Motor: 3076.53 RPM
Required Continuous Power: 66.29 kW
Required Peak Power: 161.50 kW
Governing Condition: Grade
Total Ratio (low / high): 4.6 / 4.6
Motor Performance Curves (Torque vs Speed)
Peak (solid) and continuous (dash-dot) torque curves for the up to 3 closest matching and 3 closest partially-matching systems. Target operating point marked in magenta.
All SUMO Systems — Fitment Status
| System | Inverter | Max T [Nm] | Max Speed [RPM] | Max P [kW] | Cont. T [Nm] | Cont. P [kW] | Voltage [VDC] | Status |
|---|
Matching = all four constraints satisfied (Max Torque, Max Speed, Peak Power, Continuous Power).
Partially matching = at least one constraint satisfied but not all.
Not matching = no constraint satisfied.
Talk to engineers who’ve been here before
If you’re responsible for an EV program and want to reduce uncertainty before it becomes risk, let’s talk.
We’ll review your system reality and outline a clear, feasible next step.
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