rcd@opus.UUCP (03/31/84)
<> > I was stopped once when the speedometer said I was going 55. > My wife would confirm it, because she looked at it just before > he hit his lights. It turned out that my speedometer was off > by 17 mph ( I had it checked ) when it said 55. I believe it > was because of the tires that I had on it and it was old, > 12 years with 150K+ miles. I might buy that the speedo was on its last legs, tho the way they work that's a lot of error (30%). Still, they're supposed to die at 100K. But it certainly isn't the tires being worn! First, as tires wear the speedo will read higher, not lower (because for the same reading you're traveling less distance). But second, the total change in wearing out normal tread is substantially less than 5%. -- Relax - don't worry - have a homebrew. {hao,ucbvax,allegra}!nbires!rcd
ark@rabbit.UUCP (Andrew Koenig) (04/01/84)
When I bought my TR7 four and a half years ago, the speedometer read about 20% slow. Fortunately I discovered this before getting any speeding tickets -- what tipped me off was the number of cars I kept passing on the Turnpike at 55 (indicated). The problem turned out to be the wrong speedometer gear installed in the transmission. I have a 5-speed and I think the gear actually installed was the one appropriate for the 4-speed, which has a different final drive ratio. It took several trips to the dealer to get that one straight!