What Sensors Does BetterWeigh C51701 Use to Determine Weight

Question:

What sensors are in my car that this device is taking measurements from? 2017 Kia Sorento V6 AWD.

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Expert Reply:

BetterWeigh measures weight by monitoring powertrain effort and vehicle acceleration.
Powertrain effort is calculated from a torque converter model. BetterWeigh # C51701 uses the VIN of your vehicle to search its database for the correct torque converter calibration.

If BetterWeigh doesn’t find a calibration within the database, the app will guide the user through a calibration. Acceleration is determined using a triaxial accelerometer on-board BetterWeigh. When powertrain effort is high relative to vehicle acceleration, then weight has increased and the weight info is then available.

BetterWeigh measures vehicle pitch, and uses a suspension model unique to the vehicle to calculate load. In other words, BetterWeigh learns the stiffness of the suspension and the more the vehicle pitches, the heavier the load.

expert reply by:
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Jameson C

Question:

Thanks Jameson for the great answer. Sounds interesting but possibly prone to variations like component aging, tire size variation or in my case I installed air bladders in my coil springs to help with sag. Think I'll get a tongue weight scale.

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Expert Reply:

You can use this kit with air bag suspension enhancement but you have to recalibrate it.

Here are the instructions they gave us for how to do this:

BetterWeigh measures pin weight using the pitch of the vehicle. Because your suspension is not stock, a short calibration will be required. To calibrate, go to Settings (gear symbol) -> Calibration -> Suspension Weighing.

The app will guide you through a 2 minute process where you open the tailgate and sit on the back of the truck. From other users we have learned (to be accurate) the calibration weight needs to be heavy enough (i.e. 2 people) for the bump stops to engage. The process usually requires a third person to check when the bump stops make contact.

After you've calibrated, you can use the Pin Weight function to get the pin weight for your fifth-wheel.

We do also have a tongue weight scale part # 5780.

expert reply by:
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Jameson C

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