Not Logged In Log In   Sign Up   Points Leaders
Follow Us    8:03 AM

Message Forum - Read Message

Category: Car Talk > Topics Add to favorite topics   Post new topicPost New Topic
Author Topic: Is you car speedo accurate? Back to Topics
golfer7332

Sophomore Author
Toronto

Posts:213
Points:90,130
Joined:Oct 2012
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.
REPLIES (newest first) Topic is locked
Profile Pic
psm80134
Champion Author Denver

Posts:6,170
Points:1,415,445
Joined:Nov 2011
Message Posted: Nov 18, 2013 10:03:28 AM

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

Posts:17,387
Points:2,144,865
Joined:Oct 2005
Message Posted: Nov 18, 2013 9:57:10 AM

Yes, it matches my GPS.
Profile Pic
BigHorne1
Champion Author Missouri

Posts:4,684
Points:1,117,420
Joined:Jul 2012
Message Posted: Nov 18, 2013 9:28:11 AM

I hope so
Profile Pic
WEDDY
Champion Author Phoenix

Posts:6,952
Points:1,886,920
Joined:Oct 2009
Message Posted: Nov 18, 2013 9:10:22 AM

yes
Profile Pic
EdPG
Champion Author Boston

Posts:15,816
Points:3,580,935
Joined:Jul 2005
Message Posted: Nov 18, 2013 9:07:36 AM

Yes, 2013 & 2014
Profile Pic
puddy
Champion Author Wisconsin

Posts:17,257
Points:4,151,100
Joined:Dec 2003
Message Posted: Nov 18, 2013 8:50:55 AM

yes
Profile Pic
Fredelin
Champion Author Toronto

Posts:1,164
Points:255,825
Joined:Jul 2013
Message Posted: Nov 18, 2013 8:35:24 AM

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

Posts:11,576
Points:2,869,695
Joined:Jun 2007
Message Posted: Nov 18, 2013 8:24:03 AM

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

Posts:21,096
Points:4,438,760
Joined:Dec 2002
Message Posted: Nov 18, 2013 8:21:10 AM

yes
Profile Pic
dassfg
Champion Author Fort Worth

Posts:3,320
Points:1,367,070
Joined:Mar 2011
Message Posted: Nov 18, 2013 8:16:16 AM

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

Posts:15,466
Points:2,632,630
Joined:Feb 2008
Message Posted: Nov 18, 2013 8:11:46 AM

Yes
Profile Pic
WilhamClouse
Champion Author Calgary

Posts:3,306
Points:881,735
Joined:Jun 2013
Message Posted: Nov 18, 2013 8:03:08 AM

Not really sure
Profile Pic
WEPSMAN
Champion Author South Dakota

Posts:11,547
Points:2,789,075
Joined:Mar 2005
Message Posted: Nov 18, 2013 8:01:43 AM

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

Posts:30,525
Points:1,331,990
Joined:Sep 2008
Message Posted: Nov 18, 2013 6:13:45 AM

yes..........
Profile Pic
Glasman
Champion Author South Carolina

Posts:12,904
Points:1,535,000
Joined:Nov 2006
Message Posted: Nov 18, 2013 5:55:39 AM

mine is 3 mph slow.
Profile Pic
cujo1977
Champion Author Nashville

Posts:2,731
Points:643,805
Joined:Apr 2013
Message Posted: Nov 18, 2013 4:49:26 AM

N
Profile Pic
FuelPump
Champion Author Los Angeles

Posts:25,048
Points:4,287,950
Joined:Apr 2003
Message Posted: Nov 18, 2013 3:20:09 AM

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

Posts:8,128
Points:2,754,225
Joined:Feb 2005
Message Posted: Dec 11, 2012 9:02:25 PM

yes
Profile Pic
golfer7332
Sophomore Author Toronto

Posts:213
Points:90,130
Joined:Oct 2012
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.
Profile Pic
bearscharger
Champion Author Cleveland

Posts:4,666
Points:1,191,795
Joined:Aug 2012
Message Posted: Dec 11, 2012 3:35:45 PM

yes
Profile Pic
kellyoneal
Champion Author Louisville

Posts:3,118
Points:1,497,860
Joined:Mar 2011
Message Posted: Dec 11, 2012 1:46:10 PM

yes
Profile Pic
Titanic1985
Champion Author South Carolina

Posts:10,858
Points:1,106,095
Joined:Dec 2010
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.
Profile Pic
WES03
Champion Author Maryland

Posts:7,859
Points:2,029,660
Joined:Feb 2009
Message Posted: Dec 11, 2012 9:51:58 AM

Very accurate.
Profile Pic
bluenvoy
Champion Author Nashville

Posts:17,387
Points:2,144,865
Joined:Oct 2005
Message Posted: Dec 11, 2012 9:51:54 AM

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

Posts:3,389
Points:209,205
Joined:Apr 2010
Message Posted: Dec 11, 2012 9:42:36 AM

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

Posts:5,383
Points:1,291,900
Joined:Dec 2011
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.
Profile Pic
russells350
Champion Author Montreal

Posts:6,354
Points:1,444,490
Joined:Apr 2008
Message Posted: Dec 11, 2012 7:50:37 AM

yes
Profile Pic
GustheCat2
Champion Author San Antonio

Posts:4,956
Points:1,323,030
Joined:Feb 2012
Message Posted: Dec 11, 2012 7:28:34 AM

Mine reads about 2mph fast
Profile Pic
Millers37
Champion Author Michigan

Posts:78,678
Points:1,570,975
Joined:Nov 2008
Message Posted: Dec 11, 2012 6:24:25 AM

Yes
Profile Pic
SilverBTX
Champion Author Houston

Posts:3,154
Points:799,925
Joined:Jul 2008
Message Posted: Dec 11, 2012 5:00:04 AM

Yes
Profile Pic
Hemond
Champion Author Providence

Posts:12,963
Points:193,410
Joined:Oct 2006
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.
Profile Pic
JoeKing
Champion Author Manitoba

Posts:17,648
Points:2,668,125
Joined:May 2005
Message Posted: Dec 11, 2012 3:50:30 AM

yes
Profile Pic
rumbleseat
Champion Author Winnipeg

Posts:26,495
Points:3,949,060
Joined:Oct 2002
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.
Profile Pic
glambgirl
Champion Author Victoria

Posts:11,215
Points:1,174,805
Joined:Feb 2012
Message Posted: Dec 11, 2012 3:22:40 AM

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

Posts:9,481
Points:2,561,395
Joined:Feb 2008
Message Posted: Dec 11, 2012 12:55:29 AM

Yep
Profile Pic
2Tall
Champion Author Maryland

Posts:20,225
Points:3,783,965
Joined:Jun 2004
Message Posted: Dec 11, 2012 12:49:47 AM

Hope so.
Profile Pic
kenpowers
Champion Author Rochester

Posts:3,589
Points:886,490
Joined:Apr 2012
Message Posted: Dec 9, 2012 11:32:36 AM

yes
Profile Pic
wrmedic
Champion Author Nebraska

Posts:3,767
Points:1,223,840
Joined:Apr 2012
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.
Profile Pic
jes
Champion Author Pennsylvania

Posts:19,595
Points:4,186,895
Joined:Jun 2003
Message Posted: Dec 9, 2012 11:18:14 AM

Hope so.
Profile Pic
PatAZ
Champion Author Tucson

Posts:10,333
Points:150,330
Joined:May 2008
Message Posted: Dec 9, 2012 10:37:32 AM

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

Posts:2,349
Points:511,165
Joined:Nov 2012
Message Posted: Dec 9, 2012 10:18:39 AM

Think sko
Profile Pic
JohnBoy53
Champion Author Georgia

Posts:6,456
Points:1,455,655
Joined:Oct 2005
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.
Topic is locked Back to Topics