Date: Wed, 10 May 2000 17:27:08 -0700
Reply-To: Mark Drillock <drillock@EARTHLINK.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mark Drillock <drillock@EARTHLINK.NET>
Subject: Re: Speedo Accuracy Discussion
Content-Type: text/plain; charset=us-ascii
Yep, you flunked math again. Your speedo is 4.5 mph optimistic at
indicated 70. (true 65.5 if 1 mile in 55 secs)
Mark
Max/Joyce Wellhouse wrote:
>
> Maybe I flunked math, but if you were traveling 60 mph, you would cover 1
> mile every minute. Travel 120mph and you get there in 30 seconds. Seems to
> me that for every 5 seconds you cut off that minute, you would add 10 mph:
> i.e. 70 mph would average 55 seconds, 80 mph in 50 seconds. I also get
> goofy readings when I use only one pair of lollypops. Better to time 10
> miles and take the average. With 215/70/14 Goodyear Wrangler Aquatreds(only
> a 96 load rating, my bad), my speedo is only 1 mph fast at 70 mph.
>
> Dimwitted Moose and Flying Squirrel
>
> ----Original Message-----
> From: Tobin Copley <tobin.copley@UBC.CA>
> To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
> Date: Wednesday, May 10, 2000 1:56 PM
> Subject: Re: Speedo Accuracy Discussion
>
> >At 3:44 PM -0400 5/10/00, Bulley wrote:
> >>If your highway has mile markers, time your travel between the mile
> >>markers. Interpret your result as the number of seconds, it should be in
> >>the 40-60 second range, dependent on speed. For giggles, lets say it took
> >>you 39 seconds from one mile marker to the next.
> >>
> >>-----Original Message-----
> >>From: robot . [SMTP:robot_works@HOTMAIL.COM]
> >>Sent: Wednesday, May 10, 2000 3:03 PM
> >>
> >>So without a stopwatch, how would you confirm the speedo accuracy?
> >
> >Except that mile markers are often placed a surprising distance from
> >where they "should" be. That'll throw your calculations off, and you
> >can't know in what direction.
> >
> >Find an "odometer test section" (these are the sections on the
> >interstates with the small black signs marking miles off 0, 1, 2,
> >3... usually for 5 or more miles), and time from there. The sweep
> >hand on your wrist watch will do just fine. Being a diesel westy
> >driver, my math is easy: I hold it at *exactly* 60 mph indicated--if
> >i do 5 miles in 5 minutes it means my speedo is bang on. OK for me,
> >since I always drive 60.
> >
> >Sounds like it might be hard to slow down that much for some of you
> cowboys!
> >
> >T.
> >
> >-------------------------------------------------------------------------
> >Tobin Copley Bowen Island, BC, Canada tobin.copley@ubc.ca
> >
> >'82 westy 1.6L NA diesel ("Stinky")
> >'97 son Russell =============
> >'99 daughter Margaret /_| |__| |__|:| clatter
> >1995: 'Round US, Mexico, Canada 15,000 mi O|. .| clatter!
> >1996: Vancouver to Inuvik, NWT 7,400 km ~-()-==----()-~
> >Previous buses: '76 westy deluxe (Daisy), '76 westy standard (Mango)
> >http://www.sfu.ca/~tcopley/vw/
| 
