Frequently Asked Questions
What is the power-to-weight ratio and why does it predict 0-60?
Power-to-weight (lb/hp) is the ratio of curb weight to engine output. A lower ratio means more power per pound, which directly governs how quickly a car can accelerate. The empirical formula scales with the cube root of this ratio, reflecting real drag-strip data from thousands of cars.
How accurate is this calculator compared to real published times?
Expect results within 10-15% of real magazine tests. The formula works best for rear-wheel-drive cars with a solid launch. AWD cars often outperform the prediction; traction-limited high-horsepower cars often underperform it.
Does adding a supercharger or turbo improve the prediction?
Yes - enter the new wheel-horsepower figure (measured on a chassis dyno or estimated from a tune) along with the actual curb weight. Forced-induction cars follow the same power-to-weight scaling, provided traction allows full power to be used.
Why does the quarter-mile trap speed matter?
Trap speed is the car's velocity at the 1,320-foot finish line. It is a cleaner measure of total engine power than elapsed time because it is less sensitive to launch quality and traction. Two cars with the same trap speed have essentially the same effective power-to-weight regardless of how their ETs differ.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.