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02-12-2010, 12:55 PM
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Blinded by the light
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Join Date: Sep 2009
Posts: 7,674
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Speedometer is 3mph fast, odo is off too.
My speedometer has always been 3mph faster than actual. The odometer is off as well since it is driven by that.
A GPS and the scangauge both show the correct speed. If I go a GPS indicated 65mph, the scangauge will read 65 and speedometer will read 68. This works for any speed. The scangauge odometer will also tick up slower than the one on the dash since the one on the dash is going too fast.
I don't understand how the computer knows the correct speed (since it indicates correctly on the scangauge) but the speedometer and odometer are wrong. Any suggestions?
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02-12-2010, 12:58 PM
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Welcome to FRF, & enjoy!
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Join Date: Oct 2009
Posts: 5,130
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Gnomes
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2000 Ford Ranger XLT 4x4 Offroad, 4.0L ext cab, Converted to Manual M5OD-R1HD.
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33x13.50 Toyo M/T, 15x10, Body Lift, Rebuilt OHV, JBA headers, Hurst shifter, Warn VR10000-s, Class 1 bars, Belltech Shackles, Mustang GT rear disc, Level II hooks, Modded rear hitch, Custom front hitch, Level II Blue seats and black console, Explorer IRS rear cover, Extang fulltilt, Leer Cap Yakima Roof Rack, Cobra 29 with firestik stake mount, Scangauge II
Few mods
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02-12-2010, 01:05 PM
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Ranger Enthusiast
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Join Date: Nov 2008
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I've noticed the same thing on mine when comparing GPS speed vs the speedometer but that's weird that the scanguage shows the accurate speed.
It wouldn't surprise me if this was some kind of anti-liability thing. Where they intentionally show a slightly faster speed so they can't be blamed for things like speeding tickets.
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02-12-2010, 01:12 PM
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5.Oh All the way
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Join Date: May 2009
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mines off by 2-3 mph according to GPS.
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2014 F150 SuperCrew XLT 4x4
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02-12-2010, 01:13 PM
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Blinded by the light
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Join Date: Sep 2009
Posts: 7,674
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Neither would I. But it also throws off the actual mileage of the truck. My truck with 107,000 actually only has about 100,000. Thats 7,000 less miles.
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02-12-2010, 01:14 PM
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Ford Ranger Driver
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Join Date: Oct 2009
Posts: 3,273
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mines off by 2 or 3 when i drive by those signs on the side of the road that tell you how fast your going. i always thought it was the tires size but tom might have a point there with the liability.
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02-12-2010, 01:21 PM
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~+!)@(#*$&%^
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Join Date: May 2009
Posts: 3,033
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Quote:
As of 1997, Federal standards in the United States allowed a maximum 5% error on speedometer readings.
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Pulled from wikipedia...
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02-12-2010, 01:46 PM
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DISABLE ADBLOCK: LOLZ
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Join Date: Dec 2009
Posts: 1,471
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Quote:
Originally Posted by RangerJustin
Pulled from wikipedia...
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So if you are going 3mph and it is 3mph off that makes it 100% off!
Both of my Rangers are 3mph off.
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02-12-2010, 05:20 PM
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Dead Whales Everywhere!
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Join Date: May 2009
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my truck is weird because scan gauge and GPS will say i am going 45 mph, speedo will say like 48, then i go past a radar and it says i am going 48, but my GPS which shouldnt be wrong, especially on cruise control, says im going 3 mph slower?!?!?
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02-12-2010, 05:56 PM
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Ford Ranger Driver
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Join Date: Dec 2009
Posts: 2,571
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Mine is 5mph off. Mine is probably because of my tires though. I've been thinking of popping off the needle for the speedometer and going down the road at about 50 using my GPS and popping it back on there. Anybody know if that would work?
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02-12-2010, 06:01 PM
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I'm an F-18, bro
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Join Date: Jan 2010
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Quote:
Originally Posted by ranger101
Mine is 5mph off. Mine is probably because of my tires though. I've been thinking of popping off the needle for the speedometer and going down the road at about 50 using my GPS and popping it back on there. Anybody know if that would work?
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I'm going to have to say no. You can recalibrate the speedo for different tires with a programmer though.
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1999 B2500 5 Speed
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02-12-2010, 06:15 PM
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Blinded by the light
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Join Date: Sep 2009
Posts: 7,674
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Well the thing is I have stock tires. I shouldn't have to buy a programmer to make it read correctly when it is all stock. Stupid POS.
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02-12-2010, 06:28 PM
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I'm an F-18, bro
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Join Date: Jan 2010
Posts: 1,972
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Quote:
Originally Posted by FireRanger
Well the thing is I have stock tires. I shouldn't have to buy a programmer to make it read correctly when it is all stock. Stupid POS.
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Mine is also off by a couple mph, my car is too, but my tires on the car are about 1/2 inch smaller than stock.
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1999 B2500 5 Speed
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02-12-2010, 07:03 PM
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Ford Ranger Driver
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Join Date: Dec 2009
Posts: 2,571
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Quote:
Originally Posted by ObsoleteE
I'm going to have to say no. You can recalibrate the speedo for different tires with a programmer though.
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I have that. And it still puts it a couple mph off. I guess that's as close as it's going to get though.
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2002 XLT 4X4
Auto 4.0L SOHC
8.8 w/ 4.10 L/S
Mods: Xcal 2, K&N Drop-In, Line-X, DSG Heads/Corners, 6000k Hi/Low HID's, 6K HID Fogs, Foglight Mod, Throttle Cable Mod, 6.5" Digital Designs, Rockford P400.4, 2 Sundown SA-15's, MB Quart DSC 2000.1d, Cranked T-Bars, 285/75/R16 Nitto Terra Grapplers
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03-08-2010, 12:37 AM
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Ford Motor Company
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Join Date: Mar 2010
Posts: 126
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Re: Speedometer is 3mph fast, odo is off too.
THANK GOD! I thought I was the only one that had this problem ahahaaha!
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