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#1
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Using some sort of device to get actual MPH readings?
I thought I heard something on the message boards about people using a GPS or something else to get their actual MPH readings, I would be interested in one because I have oversized tires on my 300D, and according to that Miata calculator, 60 on the speedometer is actually about 62.3 on level ground, but with others driving beside me with normal sized tires for their car, they read 70, while I read 60, and I just wanna know where I can get a device to get me the actual speed I'm going until I get new tires, which will not be for a while.
-Joe
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#2
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Borrow a GPS or buy one, like you said, that would work.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#3
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H-town,
Use the mileage markers along side any Interstart highway and a stop watch. Drive different constant speeds about 60 MPH until one takes exactly one minute to cover 1 mile (10 minutes for 10 miles would be more accurate). The speed that takes 1 minute for one mile or multiples thereof, will be the speed on your speedometer that is actuall 60 MPH. This method works best if you have a good cruise contol. Another way is to look for a radar speed detector along a road that displays your speed. P E H |
#4
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Quote:
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#5
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Quote:
I can't recomend any one over another. Never bought one as I could never justify the cost vs. utility. To many other toys to spend money on. Maybe someone else has a recomendation of a specific modle/ brand. You could ask salesman to show you features and things like rate of travel etc. That will be more accurate than stopwatch and mile markers. Those seem to have dissapeared from the highways around here. But if money is tight and you know someone with a stopwatch and have a convienient stretch you can maintain a steady speed and get time over a mile stretch, you could do the math and get an fairly accurate true speed average.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#6
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You can buy one at sporting goods stores for $150 or less for a small hand held unit. I have a Magellan 315 and it works very nicely.
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#7
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Gps
You can get a basic Garmin E-Trex for right at $100, that will do anything you'd ever want to, unless you are planning to scale some uncharted mountain.
Steve,
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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver) '87 190D 2.5 Turbo rustbucket - parts car '84 Dodge Rampage diesel - Land Speed Record Holder '13 Ram 2500 Diesel '05 Toyota 4Runner |
#8
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Some of the way-cool gps units interface with a laptop so you can run navigational software and get voice directions while driving. Pretty cool, as long as the software is really correct. My buddy and I found out the hard way that his software didn't know the Wrigleyville area of Chicago very well. I will just say I was glad it was light out and not dark...
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Keep everything as simple as possible-but no simpler--Albert Einstein |
#9
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#10
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I have seen basic Garmin's on sale at West Marine or Sports Authority for $89. You might even be able to get one with WAAS now I know that has been filtering down into the cheap hand held ones. WAAS is pretty cool it will give you your location to the inch no more within a few feet. Also the gov has had the interference turned down for the last few years so even none WAAS gps's are very accurite.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#11
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No sense renting/buying a spendy GPS just to see what your speedo is off. Do what PEH said and use the mile markers over a least 5-10+ mile stretch or find out what size your stock tires are in dia. Call a tire shop or search the internet for dia of the originals and of the new tires. Basically the % increase in tire dia is going to make your speedo/odo read slow by the same %.
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#12
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Quote:
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#13
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The cops always set up those radar trailers in my area. There supposed to slow you down by showing you your speed in large numbers. I have checked my speedo a few times using them and have found it to be right on. It is also fun to screw with them, imagin the guy who is going over the speeds 45,39,109,39,41 ect Not that I would ever do that.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#14
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I have a question for anyone who has actually used one of these GPS units for this application, measuring vehicle speed of travel: How fast does it update? How fast does it respond to changes in speed? Is it only good for average speed on the highway? If I am traveling at 30 and then speed up to 40 how fast will it register that? I assume that there is some lag and averaging going on and it would not really work very well in terms of getting an accurate speed reading all the time. But I don't know.
Thanks, Mike
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
#15
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Their is a slight lag time but they are pretty fast.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
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