Enhanced Vehicle Performance Predictor

Published road-test database

Start with a tested vehicle

Select a car, load its published specifications, and then change any value to explore alternatives. Values that were not reported are supplied as clearly identified estimates or defaults.

Loading the road-test database…

Vehicle Information

Engine Parameters

SAE Net: Modern rating measured with all accessories (accurate for calculations)
SAE Gross: Older rating without accessories (will be converted using factor below)
Default 0.8. Use 0.75-0.8 for older engines, 0.8-0.85 for newer engines

Vehicle Parameters

Weight of vehicle with fluids, no passengers/cargo
Weight used for performance calculations (includes driver, fuel, test equipment)
×
Used to calculate frontal area if not specified
Range: 0.010-0.020. Use 0.010-0.012 for low rolling resistance tires, 0.013-0.015 for standard tires, 0.016-0.020 for high performance or off-road tires
/ R
Examples: A78-13, F70-14, L60-15
Modern: 245mm width, 45% aspect ratio, 17" rim
Classic: Letter series (A78-13), 70 series (F70-14), etc.
Range: 0.80-0.88 (Torque Converter Automatic)

Drivetrain Parameters

Range: 0.1-0.5 seconds (Torque Converter Automatic)
Typical range: 1.8-2.0 for performance, 2.0-2.2 for street, 2.2-2.4 for economy
Range: 2000-2400 for stock, 2400-3000 for performance, 3000-3500 for drag racing

Test Data for Comparison

Source of the test data for comparison
Interpretation of Results:
• Positive %: Calculated values are optimistic (higher than test)
• Negative %: Calculated values are pessimistic (lower than test)
• ±5%: Excellent accuracy
• ±10%: Good accuracy
• >±15%: Poor accuracy - check input parameters

Performance Results