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Speedo errors?
No, not a thread about failed swimwear.  How far off does your speedometer have to be to get it fixed under warrantee? The speedometer in my M coupe reads about 10% high; the odometer is right on the money. | | Reply » Speedo errors? |
Nothing to fix..
BMW -and just about every other car manufacturer, deliberately makes their speedometers show too much so you don't drive too fast trusting the speedo is correct. Call it a safety margin if you like.
What i find a bit strange is that cars sold in the US have larger margins than the ones sold in Europe. What would be the reason for that?
| | Reply » Speedo errors? |
Less control on how customers can modify their cars.
In Germany, if someone puts tires on a car large enough to lower the speedometer reading by more than a few percent, and the police or TÜV catch that, the car is declared unroadworthy, the tires have to go, and approved tires have to go back on.
This indeed happens. A few months back, I came upon a guy working on his buddy's Honda and got to talking about the challenges faced by German rice boys. His buddy had lowered his car so much that I could put my shoe under the front bumper and touch it by doing not much more than lifting my toes.
Now, most people here have little to fear from the Polizei. I have been driving home toward their main station at the usual 8 km/h or so over the speed limit (a little faster and you start getting tickets) and they have passed me doing at least that much more again, just before their shift ends.  No one takes much notice of this.
The poor, German rice boys, however, must keep a constant weather eye and have a great fear of being pulled over. They fear that the police will whip out a tape measure and check the height of their headlights. If they are too low, it's back to the garage and the TÜV to remove the modification(s) and get the car declared roadworthy again.
My impression is few U.S. states have such good control over what goes on a car. Hence the added margin.
| | Reply » Speedo errors? |
Quote: How far off does your speedometer have to be to get it fixed under warrantee?
The speedometer in my M coupe reads about 10% high; the odometer is right on the money. | 10% + 4km/h. You lose. 
I figured out a purposeful way one of my controllers could remove that bias but then discovered I would violate a U.S. statue about odometer tampering with a trivial-to-impose $1000 fine and 1 year prison sentence -- even if everyone's intentions were good and there was no fraud or intent to fraud.
Dakota Digital has some units that should correct your speedometer but cause the odometer to underread.
| | Reply » Speedo errors? |
Quote: No, not a thread about failed swimwear.
How far off does your speedometer have to be to get it fixed under warrantee?
The speedometer in my M coupe reads about 10% high; the odometer is right on the money. | 10%... You mean it is showing 77 MPH, when you are actually going 70 MPH?
That is way out of spec... Usually +/- 3% is considered within spec... I'd get it checked out..
regards,
kyfdx
| | Reply » Speedo errors? |
Quote: | Dakota Digital has some units that should correct your speedometer but cause the odometer to underread. | Making the odometer read low? Wouldn't that be very illegal?
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Speedo errors?