Forum Discussion
Boomerweps
Jan 14, 2022Explorer
ajriding wrote:
I dont think this particular unit does all of this, but I have played with the technology years ago with success.
The way I calibrated it years ago was to accelerate up to 25 mpg then coast down. I guess using neutral would be needed, not just coasting in D. The device figures out aerodynamic coefficient, ground/tire friction and other numbers from this. You then could, theoretically, do a coast-down again with the trailer and compare. You will need to use the settings for trailer when trailering, and settings for no trailer when you dont have the trailer...
Based on aerodynamic coefficient and slope of the hill you are on (device knows the angle) it can generate how much power you must be putting out to go any given speed.
Knowing the weight is new to me. I always had to put in the exact weight for the device to work, but I think this vehicle device is going off of the factory given weights, which will always be wrong due to cargo in the vehicle, weight of the person, amount of fuel in the tank etc...
Looking forward to hear feedback from those that actually use it rather than opinions of those who have not..
It's not set up (currently) to do wind drag or MPG comparisons.
Not sure of the vehicle model years in its library but 2008 Explorer had to be calibrated, but for my newer 2019 F150 I just had to enter the VIN for initial calibration. Sweet. Manual calibration required entering occupant weight, GVWR, load capacity, weight of any added cargo. For manual calibration for the truck load, you start it and then enter your weight and sit on the tailgate or hatch opening. MANY straight line, level runs at moderate and hard acceleration until it says each measurement complete anywhere from 15 to 30 mph were needed with the 2008.
WDH function is determined by three measurements. Unloaded hitch, loaded hitch no spring bars, loaded hitch with spring bars. All using the truck angle change.
You make a run like the calibration run for actual weight measurements, straight, level road accelerating as directed until it tells you complete. Unfortunately, it does not store the various measurements. So you have to do a unhooked weight run to get the truck current weight, then hook up the trailer and make another run. Then use basic manual math to subtract one from the other for trailer weight.
It does a lot of stuff for $100 or so, using a small OBD plug and a smart phone app and can be moved to different vehicles.
NOTE: I have read that you can't run both the BetterWeigh and CURT Bluetooth brake controller at the same time on the same smartphone.
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