| vehiclemass | Integer | The mass of your vehicle in kg. |
| vehiclecda | Floating point | The CDa of your vehicle. This is the CD multiplied by the frontal area. Sometimes this value is only available as a single number rather than the two separate numbers. If you have the two separate numbers, then multiply them together and use the result here. |
| airdensitykgm3 | Floating point | Specifies the air density at which your testing is being performed in kilograms per cubic metre. For sea level, this is usually 1.225 |
| rollingdragfactor | Floating point | This is the amount of drag caused by the friction of the tyres when the vehicle is rolling. Typical values are around 0.013 for a standard passenger car. There are methods for calculating this figure availble on the internet, by doing a coast down test with the clutch depressed. Or you can just use 0.013 as a sensible approximation. |
| bhptimeout | Integer | This is the number of milliseconds after which the system should revert to calculating steady state horsepower after an acceleration phase. It exists to stop jitter in the calculations. This value is normally left at 500. |
| drivetrainpowerloss | Integer | This value specifies the percentage of power that is lost due to drivetrain friction (gearbox, differential etc). This is the value that is usually calculated on a rolling road by doing a coast down test with the clutch engaged. It is used to determine crank horsepower from wheel horsepower. A typical number is 15, representing 15% power loss. |
| speeddeltatrigger | Integer | Default 2, if not specified. Specifies the number of mph (or kph) delta that must occur for new horsepower and torque calculations to be performed during an acceleration phase. Depending on how noisy your VSS signal is, you may need to increase this value to remove dips in the power curve displayed on performance charts. Note though that these dips might be a bad tune too ;-) |