Home
Back
Wallace 1/4 Mile MPH Formula:
| From: | To: |
The Wallace 1/4 Mile MPH Calculator estimates the speed a vehicle can achieve at the end of a quarter-mile drag strip based on its horsepower and weight. This formula provides a quick approximation of performance potential.
The calculator uses the Wallace equation:
Where:
Explanation: The equation calculates the cube root of the power-to-weight ratio and multiplies it by a constant factor of 234 to estimate the quarter-mile speed.
Details: Estimating quarter-mile speed helps automotive enthusiasts and racers predict vehicle performance, compare different setups, and set realistic expectations for drag racing events.
Tips: Enter horsepower and weight in pounds. Both values must be greater than zero for accurate calculation.
Q1: How accurate is the Wallace formula?
A: The Wallace formula provides a reasonable estimate but actual performance may vary based on traction, aerodynamics, transmission efficiency, and other factors.
Q2: What is a good quarter-mile MPH?
A: For street cars, 90-110 mph is considered good performance. Professional drag cars can exceed 330 mph.
Q3: Does this formula work for all types of vehicles?
A: It works best for rear-wheel drive vehicles with good traction. Front-wheel drive and all-wheel drive vehicles may have different results due to weight transfer and traction characteristics.
Q4: Should I use wheel horsepower or engine horsepower?
A: For most accurate results, use wheel horsepower which accounts for drivetrain losses. Engine horsepower will give optimistic results.
Q5: Can this formula predict ET (elapsed time) as well?
A: While MPH and ET are related, this formula specifically calculates speed. Different formulas exist for estimating elapsed time.