Inaccurate VMS Data
Cummins M11
On our last rig the VMS data was right on. On this one, Three readouts apparently are wrong.
MPH: When running at 60 mph on the dash speedometer, two GPS units (Tom Tom & phone) agree that we are traveling at 60. The VMS shows 62. The only thing I can think of is tires. We are running the right size (275/80) Continentals. I know I can add a 3% multiplier to the VMS to compensate and that would fix the readout but I'm curious as to why it would be off. Continentals slightly smaller?
ODOMETER: The dash (mechanical) shows 103,228; the VMS shows 108,031. Almost a 5% difference.
ENGINE HOURS: Way off. The gauge in the back shows 1,325 hours and the VMS, 2,193. I haven't checked the back gauge to see if it's working but it may not be as those hours would yield a 78 mph average. This engine is no dog but that's sounds pretty darn optimistic!
Just looking for ideas. Thanks.
jor
On our last rig the VMS data was right on. On this one, Three readouts apparently are wrong.
MPH: When running at 60 mph on the dash speedometer, two GPS units (Tom Tom & phone) agree that we are traveling at 60. The VMS shows 62. The only thing I can think of is tires. We are running the right size (275/80) Continentals. I know I can add a 3% multiplier to the VMS to compensate and that would fix the readout but I'm curious as to why it would be off. Continentals slightly smaller?
ODOMETER: The dash (mechanical) shows 103,228; the VMS shows 108,031. Almost a 5% difference.
ENGINE HOURS: Way off. The gauge in the back shows 1,325 hours and the VMS, 2,193. I haven't checked the back gauge to see if it's working but it may not be as those hours would yield a 78 mph average. This engine is no dog but that's sounds pretty darn optimistic!
Just looking for ideas. Thanks.
jor
