1. What Is Effective Gear Ratio?

The effective gear ratio represents the final drive ratio that determines how many times the engine must rotate to turn the wheels once. It's calculated by multiplying the transmission gear ratio by the axle ratio, providing a comprehensive measure of a vehicle's gearing.

2. How Does The Calculator Work?

The calculator uses the effective ratio formula:

Where:

• Transmission Ratio — The gear ratio of the selected transmission gear
• Axle Ratio — The final drive ratio in the differential

Explanation: This calculation shows the overall gear reduction from engine to wheels, which directly impacts engine RPM at given vehicle speeds.

3. Importance Of Effective Ratio For Fuel Efficiency

Details: The effective gear ratio significantly influences fuel efficiency. Higher ratios (numerically lower) typically allow the engine to operate at lower RPMs during cruising, reducing fuel consumption. Optimal gearing balances acceleration performance with highway fuel economy.

4. Using The Calculator

Tips: Enter the transmission ratio and axle ratio as positive decimal values. Both values must be greater than zero. The calculator will compute the effective ratio which can be used to compare different gearing setups for fuel efficiency.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good effective ratio for fuel efficiency?
A: Generally, lower numerical ratios (e.g., 2.5-3.5) are better for highway fuel economy as they allow lower engine RPM at cruising speeds.

Q2: How does effective ratio affect acceleration?
A: Higher numerical ratios provide better acceleration but result in higher engine RPM at speed, reducing fuel efficiency.

Q3: Can I change my vehicle's effective ratio?
A: Yes, by changing either the transmission gears or the axle/differential gears, though axle changes are more common for altering the effective ratio.

Q4: How does tire size affect effective ratio?
A: Larger tires effectively create a higher (numerically lower) ratio, while smaller tires create a lower (numerically higher) ratio, affecting both performance and fuel economy.

Q5: Should I prioritize fuel efficiency or performance when choosing gearing?
A: This depends on your driving needs. Highway commuters may prefer efficiency-oriented gearing, while performance enthusiasts may prioritize acceleration.