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/ |
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