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From: cpr0@bunny.UUCP (C. Rosebrugh)
Newsgroups: net.auto.tech
Subject: Re: Speedometer Limits, Shark Hunts ....
Message-ID: <275@bunny.UUCP>
Date: Sun, 22-Dec-85 12:09:47 EST
Article-I.D.: bunny.275
Posted: Sun Dec 22 12:09:47 1985
Date-Received: Fri, 17-Jan-86 05:16:25 EST
References: <1400@cornell.UUCP> <-74821361@techsup> <272@bunny.UUCP> <348@weitek.UUCP>
Organization: GTE Laboratories, Waltham, MA
Lines: 38

In response to a response to my original posting (this should go out
by mail, but we don't mail too well around here).
My original questions:
> >
> > Seriously, though, what's the regulation behind the maximum numbers on a
> > speedometer? How come the majority of them went to 85MPH some years back?
> > Why the change back to big numbers AND, if there is some "law" limiting
> > the largest number on the dashboard, does it apply to foreign cars
> > also - my 325e's speedo goes to 140+.
> 
> 140+? Wishful thinking, perhaps. :-)
Actually, speedo goes to 150. No, not really wishful thinking - had it
at 125 on the Mass. Pike Eastbound yesterday, along with a 5-series
Bimmer. That's about where the old "Eta" engines stops, though.
> 
(The only sensible part of the response was here.)
> > 
> > Also, if a rip the stopper pin out of a speedometer (the pin the needle hits
> > at max mph), is the needle movement still "linear" (given that the actual
> > motion is circular)?
> Gee, Chris, why not just use your tach instead? If in my car 2500 rpm = 55 mph
> in fifth gear, then redline = 143 mph. Weeeeeee!!!!!
Brilliant, but how many cars have a tach?!! Weeeeeeeee!!!!!!!!!
And, how many engines have the high end torque to follow your formula
of top speed!!! Weeeeeeeeeee!!!!!!!!  Weee!!! - do you leave your
car out of gear while you pour on the gas in the same way you leave
your brain out of gear while you pour on the words?!!
> I realize that the bulk of this article was non-technical. May I suggest that
> further discussion on this topic be taken up in net.auto.
What's not technical about the gearing and the pinning of a speedometer?!
In another article, someone says that pinning a speedo doesn't do anything
to it (since coupled electromagnetically), but a friend has a Saab 900s
whose needled was pinned, and subsequently uncalibrated, twice.
> -Neal -- he's one we can do away with.
> UUCP: {turtlevax, resonex, cae780}!weitek!neal
Thanks to those who responded with useful info.

      Chris Rosebrugh, GTE Labs, Waltham, Mass. !harvard!bunny!cpr0