- Compare and drag race up to 3 vehicles side-by-side.
- Simulate 0-60, 1/4 mile, and other performance metrics.
- Add modifications to vehicles and see how performance is affected.
- Extensive specifications including power curves and gearing.

Engine

Data Point | Description |
---|---|

Horsepower | Peak horsepower |

Torque | Peak Torque (lb-ft) |

Peak Power RPM | RPM which peak power occurs |

Peak Torque RPM | RPM which peak torque occurs |

Type/Arrangement | Motor type and arrangement (e.g "V-8") |

Forced Induction | Designates if engine is supercharged or turbocharged |

Number of cylinders | Number of cylinders in a piston engine |

Displacement | Displacement of engine (liters) |

Bore | Bore of cyclinder (millimeters) |

Stroke | Stroke of cyclinder (millimeters) |

Number of valves | Number of valves |

Valvetrain | Valvetrain description (e.g "DOHC") |

Compression Ratio | Compression ratio |

Battery Capacity | Battery capacity in kWh for Hybrids and EVs |

Transmission/Drivetrain

Data Point | Description |
---|---|

Transmission Type | Type of transmission (e.g "Automatic") |

Transmission Sub-type | Detailed type of transmission for automatics (e.g "DCT" or "CVT") |

Number of Gears | Number of gears |

Gear Ratios | List of gear ratios for each gear |

Axle ratio | Final Drive/Axle ratio |

General

Data Point | Description |
---|---|

Curb Weight | Vehicle equipped weight w/o occupants (pounds) |

Drag Coefficient | Coefficient of Drag ($C_d$) |

Body Dimensions | Dimensions of body: length|width|height (inches) |

Wheelbase | Distance between wheels along length axis (inches) |

Track | Distance between wheels along width axis (inches) |

Ground clearance | Height between ground and lowest point on body (inches) |

Font Tire Size | Front tire descriptor (e.g "P245/35YR19") |

Rear Tire Size | Rear tire descriptor (e.g "P305/30YR20") |

Tire compound | Category of tire (e.g "Summer performance") |

Fuel Tank Capacity | Fuel tank capacity (gallons) |

Highway MPG | Advertised highway MPG |

City MPG | Advertised city MPG |

Combined MPG | Advertised combined MPG |

- Start plotting initial torque curve. The first point is peak horsepower where$torque = horsepower * 5252 / rpm$
- Plot 2 more points: torque at idle rpm and torque at peak torque rpm.
- Use polynomial regression to generate a torque curve function f where$torque = f(rpm)$

$τ_{wheel} = (τ_{motor} * ratio_{gear} * ratio_{axle} * loss_{drivetrain}) / radius_{tire}$

$ratio_{gear}$ - Gear ratio of the current gear.

$ratio_{axle}$ - Final drive or axle ratio.

$loss_{drivetrain}$ - Drivetrain efficiency - (e.g 85% for RWD with Manual Transmission)

$radius_{tire}$ - Dynamic radius of the tire calculated by taking 99% of the resting radius.

Note that this works for vehicles without transmission (e.g Tesla). The gear ratio will be a static value = 1 and drivetrain efficiency ($loss_{drivetrain}$) will be much higher. Also, some cars have variable final drive ratios (e.g Ford Focus RS) which are supported.$ratio_{gear}$ - Gear ratio of the current gear.

$ratio_{axle}$ - Final drive or axle ratio.

$loss_{drivetrain}$ - Drivetrain efficiency - (e.g 85% for RWD with Manual Transmission)

$radius_{tire}$ - Dynamic radius of the tire calculated by taking 99% of the resting radius.

Drivetrain | Efficieny |
---|---|

Front-wheel Drive | 88% (12% loss) |

Rear-wheel Drive | 85% (15% loss) |

All-wheel Drive | 82% (18% loss) |

No transmission (EV) | 90% (10% loss) |

- Transmission Type: ("Automatic" or "Manual")
- Sub-type: ("DCT", "CVT", etc)
- Holistic parameters (Year, make, and model) which are compared to similar vehicles with known shift times

Tire Compound | Base Coefficient of Friction |
---|---|

Drag Radial | 1.50 |

Race Compound | 1.15 |

Summer Performance | 1.075 |

Performance All-season | 1.0 |

All-season | 0.97 |

All-terrains | 0.80 |

$F_{thrust} = (I_{sp})(g)(m_{vehicle})$

where

$I_{sp} = 70s$ (Estimated Specific Impulse)

$g = 9.806 m/s^2$ (Gravitational Constant)

$m_{vehicle}$ (Estimated Vehicle Curb Weight)

$I_{sp} = 70s$ (Estimated Specific Impulse)

$g = 9.806 m/s^2$ (Gravitational Constant)

$m_{vehicle}$ (Estimated Vehicle Curb Weight)

The acceleration of the car is then calculated as:

$a_{vehicle} = (F_{thrust} + F_{tire}) / m_{vehicle}$

where

$F_{thrust}$ (Force of Thruster)

$F_{tire}$ (Estimated Tire Force)

$F_{thrust}$ (Force of Thruster)

$F_{tire}$ (Estimated Tire Force)

The simulation lets you change the curb weight, COPV capacity, max rear-facing thrust, and the firing delay.