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Author Topic: Is you car speedo accurate? Back to Topics
golfer7332

Sophomore Author
Toronto

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Message Posted: Dec 7, 2012 8:34:37 PM

my two newer cars have true speed of 93 and 95 kph when speedo indication is 100 kph. I suspect this maybe the newer car trend. I don't remember older year cars have this issues. What year and make of car if your speeding is inaccurate. I use a portable GPS to verified the speed.
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psm80134
Champion Author Denver

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Message Posted: Nov 18, 2013 10:03:28 AM

No speedometer is ever 100% precise.
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bluenvoy
Champion Author Nashville

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Message Posted: Nov 18, 2013 9:57:10 AM

Yes, it matches my GPS.
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BigHorne1
Champion Author Missouri

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Message Posted: Nov 18, 2013 9:28:11 AM

I hope so
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WEDDY
Champion Author Phoenix

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Message Posted: Nov 18, 2013 9:10:22 AM

yes
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EdPG
Champion Author Boston

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Message Posted: Nov 18, 2013 9:07:36 AM

Yes, 2013 & 2014
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puddy
Champion Author Wisconsin

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Message Posted: Nov 18, 2013 8:50:55 AM

yes
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Fredelin
All-Star Author Toronto

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Message Posted: Nov 18, 2013 8:35:24 AM

I would think the reading of my BMW odometer is accurate
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the1roadhog
Champion Author Atlanta

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Message Posted: Nov 18, 2013 8:24:03 AM

Cross checked with my radar detector's software and reporting and it's a yes.
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Will 1
Champion Author Regina

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Message Posted: Nov 18, 2013 8:21:10 AM

yes
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dassfg
Champion Author Fort Worth

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Message Posted: Nov 18, 2013 8:16:16 AM

Very close according to my gps speedometer
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RF4CPhantom
Champion Author Oklahoma City

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Message Posted: Nov 18, 2013 8:11:46 AM

Yes
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WilhamClouse
Champion Author Calgary

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Message Posted: Nov 18, 2013 8:03:08 AM

Not really sure
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WEPSMAN
Champion Author South Dakota

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Message Posted: Nov 18, 2013 8:01:43 AM

I think my vehicles are 1 or 2 mph off also.
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contiki
Champion Author Ontario

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Message Posted: Nov 18, 2013 6:13:45 AM

yes..........
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Glasman
Champion Author South Carolina

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Message Posted: Nov 18, 2013 5:55:39 AM

mine is 3 mph slow.
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cujo1977
Champion Author Nashville

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Message Posted: Nov 18, 2013 4:49:26 AM

N
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FuelPump
Champion Author Los Angeles

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Message Posted: Nov 18, 2013 3:20:09 AM

Probably within the 2% margin that manufactures consider acceptable.
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GBMAX
Champion Author Phoenix

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Message Posted: Dec 11, 2012 9:02:25 PM

yes
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golfer7332
Sophomore Author Toronto

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Message Posted: Dec 11, 2012 8:19:43 PM

95 volvo and 2001 Mazda are spot on, 2005 acura off 5%, 2011 VW off 7%. Actually got moneyback from Acura due to a class action law suit in the states.Apparently the Acura odo reading is tied in the same signal as the speedo unlike VW.
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bearscharger
Champion Author Cleveland

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Message Posted: Dec 11, 2012 3:35:45 PM

yes
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kellyoneal
Champion Author Louisville

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Message Posted: Dec 11, 2012 1:46:10 PM

yes
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Titanic1985
Champion Author South Carolina

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Message Posted: Dec 11, 2012 12:34:51 PM

Yes, as compared with my GPS and also roadside radar displays. The speedometer is a digital readout (not an analog guage), so the numbers do match up exactly.
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WES03
Champion Author Maryland

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Message Posted: Dec 11, 2012 9:51:58 AM

Very accurate.
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bluenvoy
Champion Author Nashville

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Message Posted: Dec 11, 2012 9:51:54 AM

Yes. Checked it with my GPS in both of my vehicles.
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DasAuto92
Champion Author Montreal

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Message Posted: Dec 11, 2012 9:42:36 AM

I'm assuming it is.....No speeding tickets as of late.
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weddy11
Champion Author Phoenix

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Message Posted: Dec 11, 2012 9:12:24 AM

My Honda fit is right on, my 98 ford ranger is 5% slow due to oversize tires.
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russells350
Champion Author Montreal

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Message Posted: Dec 11, 2012 7:50:37 AM

yes
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GustheCat2
Champion Author San Antonio

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Message Posted: Dec 11, 2012 7:28:34 AM

Mine reads about 2mph fast
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Millers37
Champion Author Michigan

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Message Posted: Dec 11, 2012 6:24:25 AM

Yes
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SilverBTX
Champion Author Houston

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Message Posted: Dec 11, 2012 5:00:04 AM

Yes
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Hemond
Champion Author Providence

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Message Posted: Dec 11, 2012 4:36:09 AM

Speedometer is off by a couple of mph at highway speed. Funny though when I take a readout on my Scanguage the speed is dead on. (comparing to GPS that is) Yet Scanguage reads the same computer and sensor the speedometer does.

The only explanation is this is deliberately done by the factory. Its a safety thing to fool you into thinking you are going faster than you are.
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JoeKing
Champion Author Manitoba

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Message Posted: Dec 11, 2012 3:50:30 AM

yes
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rumbleseat
Champion Author Winnipeg

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Message Posted: Dec 11, 2012 3:28:19 AM

Verify by finding a stretch of road with speed check markings, and do a simple timing. The only times I have ever been out by more than a couple of mph were, on one car, after replacing a blown transmission with one from a newer model (old speedo was in mph, tranny came from a model in kph, didn't change the speedo gear), and on another car, when I upsized wheel/tire combination.
My present car is so close that, on several runs through the speedo check, we calculate speedo is within 1% of actual speed.
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glambgirl
Champion Author Victoria

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Message Posted: Dec 11, 2012 3:22:40 AM

Have always just assumed the speedometer was accurate.
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04Ram1500
Champion Author Boston

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Message Posted: Dec 11, 2012 12:55:29 AM

Yep
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2Tall
Champion Author Maryland

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Message Posted: Dec 11, 2012 12:49:47 AM

Hope so.
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kenpowers
Champion Author Rochester

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Message Posted: Dec 9, 2012 11:32:36 AM

yes
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wrmedic
Champion Author Nebraska

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Message Posted: Dec 9, 2012 11:27:47 AM

Most of the vehicles I have checked with a GPS are showing 3-4 mph faster on the speedometer then you are really going. I have checked several cars over the years and I don't know that this is a new trend.
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jes
Champion Author Pennsylvania

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Message Posted: Dec 9, 2012 11:18:14 AM

Hope so.
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PatAZ
Champion Author Tucson

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Message Posted: Dec 9, 2012 10:37:32 AM

The Toyota is the BMW is about 5 mph high on the highway.
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Trowinsamoan
Champion Author Los Angeles

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Message Posted: Dec 9, 2012 10:18:39 AM

Think sko
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JohnBoy53
Champion Author Georgia

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Message Posted: Dec 7, 2012 9:39:36 PM

I had a Dodge Ram 1500 which 17" tires came standard. Some previous owner put 20" tires on it and the speed was off exactly 10%. It was actually going faster than the indicated speed. Again, verified by a GPS.
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