Final Drive Ratio Calculator
Calculate how final drive ratio changes affect vehicle performance. See how gear ratio modifications impact acceleration, top speed, and RPM at highway speeds.
Step 1: Vehicle Specifications
Understanding Final Drive Ratios
Lower ratios (e.g., 3.23) improve fuel economy and reduce highway RPM but decrease acceleration. Higher ratios (e.g., 4.10) improve acceleration but increase RPM at highway speeds and reduce fuel economy.
Step 2: Calculation Parameters
About Final Drive Ratios
The final drive ratio is the gear reduction in the differential. Changing this ratio affects how the engine’s power is delivered to the wheels. A higher ratio multiplies torque more, improving acceleration but limiting top speed.
Final Drive Ratio Analysis
RPM at Highway Speed with New Ratio
Final Drive Ratio Comparison
| Final Drive Ratio | Highway RPM | Acceleration Impact | Best Use Case |
|---|
Performance Impact Analysis
Final Drive Ratio Formula
RPM = (Speed × Final Drive Ratio × Transmission Ratio × 336) / Tire Diameter
This formula calculates engine RPM at a given speed. Changing the final drive ratio directly affects RPM, which impacts acceleration, fuel economy, and top speed capabilities.
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