LRNAD90
0
(Okay, inaccuracy would probably be more accurate, no pun intended)
So 1995 NAS D90.
Cable driven speedo.
Original Tire Size 265/75-16, current tire size 285/75-16.
Speedometer reads about 5 mph high, when compared to GPS speed reported by WAZE app on a phone..
What is odd to me, is that it is consistently 5 mph high:
Indicated 30 mph, 25 mph on gps..
Indicated 40 mph, 35 mph on gps..
Indicated 50 mph, 45 mph on gps..
Indicated 60 mph, 55 mph on gps..
Indicated 70 mph, 65 mph on gps..
Indicated 75 mph, 70 mph on gps..
I would think its 'inaccuracy' would be a percentage, so the actual difference would vary with speed. I would also think that rolling on larger tires would cause the speedometer to read lower than it did on stock tires, so it read like 10 mph fast on stock tires?
What am I missing?
This also leads me to the question of mileage/odometer accuracy. If it reads faster than actual speed, then it is racking up more miles that actually travels as well, right? But if the error is not a percentage of speed/distance, how would I 'estimate' how many more miles are reported by the odometer than it has actually traveled?
So 1995 NAS D90.
Cable driven speedo.
Original Tire Size 265/75-16, current tire size 285/75-16.
Speedometer reads about 5 mph high, when compared to GPS speed reported by WAZE app on a phone..
What is odd to me, is that it is consistently 5 mph high:
Indicated 30 mph, 25 mph on gps..
Indicated 40 mph, 35 mph on gps..
Indicated 50 mph, 45 mph on gps..
Indicated 60 mph, 55 mph on gps..
Indicated 70 mph, 65 mph on gps..
Indicated 75 mph, 70 mph on gps..
I would think its 'inaccuracy' would be a percentage, so the actual difference would vary with speed. I would also think that rolling on larger tires would cause the speedometer to read lower than it did on stock tires, so it read like 10 mph fast on stock tires?
What am I missing?
This also leads me to the question of mileage/odometer accuracy. If it reads faster than actual speed, then it is racking up more miles that actually travels as well, right? But if the error is not a percentage of speed/distance, how would I 'estimate' how many more miles are reported by the odometer than it has actually traveled?