Zeitenjagd Power Calculator
BOSSPOWER
This app allows you to accurately determine the engine power of cars and other vehicles with combustion engines.
This requires at least a 10Hz GPS measurement of the time intervals using a measuring device such as Dragy, Pgear, or Racebox.
Important: Every calculation paid for with a token is automatically saved as an image and a PDF!
> Image: Gallery/Time Trial
> PDF: Downloads/Time Trial
New: Login is now required to ensure all tokens and results are securely stored on the server!
Additionally, there is now a history function where you can compare two calculations.
What can be analyzed?
For example, 100-200 km/h, 200-250 km/h, 200-300 km/h, or any custom run.
> Any interval from 60-300 km/h can be calculated.
Important: The measuring device must output the intervals in 10 km/h increments!
A total time of, for example, 80-190 km/h is not sufficient.
What information is entered into the app?
> Vehicle weight (measured)! Vehicle registration or an estimate is not sufficient!
> Weight of the driver or passengers
> Drag coefficient (Cd) and frontal area of the vehicle (if not available, you must look this up online or with the manufacturer)
> Air pressure in mbar > IMPORTANT! Not the corrected air pressure at sea level that is entered online, but the local pressure at the measurement altitude! Almost every mobile phone now has a built-in barometer.
> Temperature on the day/location of measurement
> Slope in % > Attention! The elevation profile must be level or a constant uphill or downhill slope! With Pgear, for example, the 100-200/200-250/60-160 time intervals can be set to 0% via "correction enable," which makes input simpler since everything is corrected to 0%.
> Interval time entry: The interval time must be entered, e.g., Enter 150-160, 160-170, 170-180; i.e., with Dragy, you have to determine the individual time yourself. DO NOT enter the values from Dragy, such as 100-150, 100-160, etc.!!
> Gear selection for the intervals is important for the calculation!
Evaluation of a power curve (as on a dyno):
- Measure as on a dyno, e.g., only in 4th or 5th gear.
- Measure the interval time from, e.g., 3000-6800 RPM in 4th gear.
- Enter the GPS km/h at 3000 RPM in the measured gear in the additional option "Calculate RPM + Nm optional."
This requires at least a 10Hz GPS measurement of the time intervals using a measuring device such as Dragy, Pgear, or Racebox.
Important: Every calculation paid for with a token is automatically saved as an image and a PDF!
> Image: Gallery/Time Trial
> PDF: Downloads/Time Trial
New: Login is now required to ensure all tokens and results are securely stored on the server!
Additionally, there is now a history function where you can compare two calculations.
What can be analyzed?
For example, 100-200 km/h, 200-250 km/h, 200-300 km/h, or any custom run.
> Any interval from 60-300 km/h can be calculated.
Important: The measuring device must output the intervals in 10 km/h increments!
A total time of, for example, 80-190 km/h is not sufficient.
What information is entered into the app?
> Vehicle weight (measured)! Vehicle registration or an estimate is not sufficient!
> Weight of the driver or passengers
> Drag coefficient (Cd) and frontal area of the vehicle (if not available, you must look this up online or with the manufacturer)
> Air pressure in mbar > IMPORTANT! Not the corrected air pressure at sea level that is entered online, but the local pressure at the measurement altitude! Almost every mobile phone now has a built-in barometer.
> Temperature on the day/location of measurement
> Slope in % > Attention! The elevation profile must be level or a constant uphill or downhill slope! With Pgear, for example, the 100-200/200-250/60-160 time intervals can be set to 0% via "correction enable," which makes input simpler since everything is corrected to 0%.
> Interval time entry: The interval time must be entered, e.g., Enter 150-160, 160-170, 170-180; i.e., with Dragy, you have to determine the individual time yourself. DO NOT enter the values from Dragy, such as 100-150, 100-160, etc.!!
> Gear selection for the intervals is important for the calculation!
Evaluation of a power curve (as on a dyno):
- Measure as on a dyno, e.g., only in 4th or 5th gear.
- Measure the interval time from, e.g., 3000-6800 RPM in 4th gear.
- Enter the GPS km/h at 3000 RPM in the measured gear in the additional option "Calculate RPM + Nm optional."
Developer email
kadmichael@hotmail.de
Released
Feb 20, 2026
Current version
1.4.8
Android version
8.0
Screenshots
