Normal would be for the displayed speed to be higher than the actual speed to make it less likely to be ticketed for speeding.rbrak29 said:Speed reading is consistently 2 mph lower than actual speed (street speed monitors). I have heard this is normal for a BMW.
Wouldn't that be higher, or over, what the radar shows?JohnKelly said:Both of the i3s we've had have run 2mph under what radar stations show.. so speedometer reads 30mph, and the radar says 28mph, for instance.
theothertom said:Wouldn't that be higher, or over, what the radar shows?JohnKelly said:Both of the i3s we've had have run 2mph under what radar stations show.. so speedometer reads 30mph, and the radar says 28mph, for instance.
Car manufacturers are allowed by law to err on the high side by up to 10%. They aren't allowed to err below the actual speed. So the tolerance is +10%, -0% of the actual speed.
I'm on my 5th BMW and they've all read high, as have 2 Hondas and two Toyotas. No manufacturer wants to read lower or they'll be fined.
jadnashuanh said:I've always sort of wondered if that speed reading is also affecting the odometer. It doesn't have to, as both are controlled via the computer. If so, people are being cheated because the car would reach the warranty limit earlier than reality. I guess on a longer trip on a roadway with mile markers, I could check that out. I'll try to remember the next time I go far enough to try to make an estimate, but even changing lanes over a long distance could add up to an error when there are curves involved....
How far did you drive? To show up an error, you'd have to drive a fair distance. Say it was off as a result of that 2mph difference, you'd have to drive miles to be off by even a tenth on the odometer, depending on your overall speed. I'd be surprised if it was off, but then, I do not know.rbrak29 said:I did do a quick odometer check using mile markers and the odometer readings seemed OK.
jadnashuanh said:How far did you drive? To show up an error, you'd have to drive a fair distance. Say it was off as a result of that 2mph difference, you'd have to drive miles to be off by even a tenth on the odometer, depending on your overall speed. I'd be surprised if it was off, but then, I do not know.rbrak29 said:I did do a quick odometer check using mile markers and the odometer readings seemed OK.
rbrak29 said:Anyone have an problem with inaccurate speed readings on an i3? Mine is a 2015 i3 REX. Speed reading is consistently 2 mph lower than actual speed (street speed monitors). I have heard this is normal for a BMW.
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