Shortly after I bought my '97 VW Eurovan Camper in late '97, I noticed that it was reading higher than I was going as timed by stopwatch and mile markers. I kept measuring from time to time to sort of average things out. I finally complained to the dealer that it was about 5% high. After a lot of incidental discussion about tire sizes, air pressure, etc. they called VWoA. The answer? The Feds then required the speedometer to read not less than 2% nor more than 8% high -- oddly enough, 5% is the mean of this variance. I don't know what's required now. My '02 Toyota Highlander reads a tad less than 1% high, based on readings from my Garmin eTrex.
Dick Moore On Dec 21, 2008, at 9:34 AM, [email protected] wrote: > Message: 3 > Date: Sun, 21 Dec 2008 15:23:13 +0100 > From: Predrag Dukic <[email protected]> > Subject: Re: [time-nuts] How good is my T-bolt...?? > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii"; format=flowed > > Mike, > Thunderbolt is going to bring You from NY to SF at exactly 55MPH > AVERAGE, down to the fraction of the INPH, and still there is a > possibility that You earn a speeding ticket or two (or more) on the > way. > > Predrag Dukic (also not an expert, but things are not that simple > as Your question) > > > ------------------------------ > > Message: 9 > Date: Sun, 21 Dec 2008 10:34:49 -0700 > From: "Robert Darlington" <[email protected]> > Subject: Re: [time-nuts] Thunderbolt Accuracy needs... > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1 > > And faster speedometers make your warranty run out faster, which > nobody > except the car companies like. > > On Sun, Dec 21, 2008 at 10:21 AM, Magnus Danielson < > [email protected]> wrote: > >> Thomas A. Frank skrev: >>> On Dec 20, 2008, at 6:03 PM, Burt I. Weiner wrote: >>> >>>> I suppose a good comparison would be: How accurate does the >>>> speedometer in the car really need to be and why. >>> >>> Accurate enough so that if its reading matches the posted sign, you >>> don't receive a ticket? >> >> An engineer pointed out that due to the spreading of readings on >> various >> speedometers un-necessary take-overs where performed by those >> having a >> higher speed for the same reading than those having a lower speed for >> the same reading. Thus, the precaution is to some degree >> compromised by >> the lack of consistency in the degraded reading. This is further >> compromised by people knowing their speedometers is degraded, so they >> form their own rules of how to interprent them in a favorable >> fashion. >> The tires and air pressure in them comes in as things compromising >> the >> scale. My speedometer gives different readings on my summer-tires >> than >> my winter tires. >> >> I think I actually prefer more exact speedometer in all cars. Then >> there >> is less room for subjective judgements and less of a discussion >> altogether. >> >> I think we already did some work in a similar fields like weigth, >> lengths and time... >> >> I learned alot of what my speedometer told me when looking at my >> TomTom >> reading. >> >> Cheers, >> Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
