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Re: no expert, but...
Posted by Dean (more from Dean) on Tue, 21 Jan 2003 09:05:38
In Reply to: no expert, but..., turbo5spd, Mon, 20 Jan 2003 23:27:49
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03 Aero S/W
With the 17" Michelin's my speedo error is 2.5mph high at 75, and 4.0 high with 16" snow tires. Thats 3.3% and 5.3%. I would not count on the same errors at lower speeds. With my 95SET, it indicated +3% at 60-70mph. It was right on with the drive by radar systems that show you you speed at 35mpg. Note that there are two linear errors, offset and gain, then there are non-linear errors on top of that.
The best way to get true speed is with measured miles and a stop watch. The markings on the pavement for aircraft speed taps are very good. I have good luck with mile markers. When your stop watch shows very little deviation in the lap times with the mile markers, that means they are spaced very regularily. My speed as shown on the SID is about 1 mpg closer to true and the odometer shows less distance than true.
posted by 208.24.179...
Posts in this Thread:
- Need expert Tech II advice, Bill R., Mon, 20 Jan 2003 23:08:07
- 2002 Aero, speedometer <5% high, per eMap, Aero'ed, Tue, 21 Jan 2003 06:59:44
- Re: Need expert Tech II advice, TG, Tue, 21 Jan 2003 06:51:50
- As the rumor goes, all cars show a tad too much on the, Anders, Mon, 20 Jan 2003 23:44:00
- no expert, but..., turbo5spd, Mon, 20 Jan 2003 23:27:49
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