| Author | Message | ||
     Edward Mah (Emah) New Member Username: Emah Post Number: 23 Registered: 11-2002 |
I checked the archives and nothing seemed to answer my questions exactly. I have swithed to 265's tires on my 95 DI and want to know if anyone has successfully had their speedometer adjusted. How was it done or what was necessary? Thanks, Ed | ||
| Leslie N. Bright (Leslie) Senior member Username: Leslie Post Number: 1790 Registered: 02-2002 |
First, check your speedometer against a GPS... usually, people will discover that with stock tires, the speedometer was reading too fast and by going to taller tires the speedometer is more accurate now. FWIW.... -L | ||
| Edward Mah (Emah) New Member Username: Emah Post Number: 24 Registered: 11-2002 |
Are GPS's also inaccurate in speed reading? Ed | ||
| Adam Ross (Discodriveradam) Member Username: Discodriveradam Post Number: 42 Registered: 01-2003 |
They sure are. And I believe that using your GPS unit in such proximation to the tons of metal that composes a Rover will throw it off a bit too. | ||
| Leslie N. Bright (Leslie) Senior member Username: Leslie Post Number: 1795 Registered: 02-2002 |
Whoa...... I call bullshit. First) I don't recommend using a GPS as a replacement for a speedometer... as you go in and out of cover or around curves, they can lose their lock, etc.... But, on an open interstate, they're usually more accurate than the Rover's speedometer... My Garmin reads dead-on with what my Subaru's speedometer says, but the Disco is slower. Second) A vehicle's metal will throw off a compass, but, the metal itself won't throw off a GPS. (I remember seeing an officer holding a compass while standing beside a 5-ton, pointing off to the west, saying "This way is north!") What can happen are multi-paths... signals from the satellites bouncing off of other objects before the GPS picks it up, thus causing really odd "jumps" in the quality of the location's calculation. Most GPS antennas are shielded such that they'll not pick up signals from underneath, which happens to kill a lot of multipath errors. Also, the algorithms figure out what's "normal" for a given location over a short period of time, and can then recognize and discard multi-path signals. Then, add in WAAS-capability, you'll tighten down the signal further. It's possible that you might pick up a multipath off of your own vehicle, but, usually they're being deflected away from the vehicle in that case, and not towards the GPS. A heated windscreen on a D2 or a Freelander is much more likely to reek havoc with a hand-held GPS's internal antenna; using an external antenna will solve that problem rather quickly. FWIW.... -L |
