Force OBD2 – Dynomometer Testing with BMW 135i

Force OBD2 has a dynamometer feature that allows the application to estimate the torque and power of the vehicle at the wheels.


Force OBD2 works in the same way as a chassis dynamometer in that it measures the engines ability to accelerate an object. Where a chassis dynamometer measures the acceleration of a drum rotated by the vehicles wheels to calculate the torque and power, Force measures the vehicles acceleration on the road taking into account the vehicle weight, gearing and wind resistance to calculate torque and power. Force will generate torque and power measurements comparable to a chassis dynamometer.

Force relies on your smartphone or tablet’s internal sensors (the GPS and acceleration sensor) and highly tuned digital filters to estimate torque, power and acceleration without the need for external OBDII modules or additional sensors. Force can produce highly accurate performance estimations at over 50Hz (50 times per second) . Five times faster than the 10Hz (10 times per second) that most of the vehicle performance boxes get with their GPS or OBDII.

Force OBD2 Dynomometer

Testing with a BMW 135i

A stock N54 BWM 135i makes around 280whp and 300ft/lb of torque at the wheels (depending on the air temperature, humidity, ambient pressure and the dynamometer among other things).

Under most circumstances, the Force OBD2 Dynamometer will produce similar results to a chassis dynamometer.

 Stock N54 Chassis Dynamometer

Max Power = 275, Max Torque = 302

Stock N54 Force OBD2 Dynamometer

Max Power = 285, Max Torque = 300

BMS Map 5 N54 Chassis Dynamometer

Max Power = 325, Max Torque = 361

BMS Map 5 N54 Force OBD2 Dynamometer

Max Power = 310, Max Torque = 348

Leave a Reply

Your email address will not be published. Required fields are marked *