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Old 01-18-2018, 06:15 AM   #11
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Depends... Usualy in the notes they will write you for leas ten measured. I have had police officers write it in the notes, measured 52 in a 40, but the ticket is for 5 over. Prevents trying to get out of it that way and also helps with the whole calibration argument...
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Old 01-18-2018, 08:20 AM   #12
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Quote:
Originally Posted by Magus2727 View Post
Depends... Usualy in the notes they will write you for leas ten measured. I have had police officers write it in the notes, measured 52 in a 40, but the ticket is for 5 over. Prevents trying to get out of it that way and also helps with the whole calibration argument...
was ment more for giggles like any cop pulls people over for 3 over o.O well i hope if there is a place they DO stop for 3 over dear god!
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Old 01-18-2018, 08:34 AM   #13
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was ment more for giggles like any cop pulls people over for 3 over o.O well i hope if there is a place they DO stop for 3 over dear god!
I figured, but you never know sometimes.

3mph should be an easy ticket to get out of if you really were only doing 3mph over. Also if that is what the cops are ticketing you for let me know and I will move out there. It must mean they have nothing else going on and have solved all the crime and other things more menacing than 3mph over they are focusing their efforts on the "important" stuff.
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Old 01-19-2018, 12:12 AM   #14
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I think the cops almost always allow 10 mph over the limit. Some towns and certain spots might be exceptions.

Most people drive close to 10 over on most roads, especially on the highways. I was wondering though, because if pushing the grace amount at 8 - 9 mph over, I was afraid I might really be doing 11-12 mph over, which is a no-no.
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Old 01-19-2018, 12:34 AM   #15
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Question All Speedometers Set To Read 3mph High?

Quote:
Originally Posted by rambleon84 View Post
It would be very rare to find a car with an actual accurate speedometer:
Vehicle Speedometer Accuracy | How Fast Are We Really Going | OEC
That's an interesting article. I'm going to start checking mph in other vehicles and see if this shows up in them.

Has anybody else checked out any of their vehicles for this idea?
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Old 01-23-2018, 10:32 PM   #16
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Yea I have noticed mine is about 3mph off as well
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Old 01-24-2018, 06:30 AM   #17
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I likely stand corrected but there is no "calibration" done on a the vehicles speedo. There is math and tolerances done with known rotation speed and sensors.

That is why a tune requires a speedo correction if you have a tire size of final gear ratio difference. It's math and the only thing that changes is is mechanical features.

Is the slop in the location of the sensor, the accuracy of the detector, the wheel size, the change of actual tire size due to temp and speed.

Your vehicle does not get calibrated. The LEO versions of cars don't get calibrated. The speed sensor is a mechanical gear (older vehicles) or a HALL effect sensor that sends a pulse for every rotation from magnetic detection. (this is done for the cam shaft position sensor and the crank position sensor on the Zetec motor) . The ECU knows that 4 pulses equals 4 rotations of the tires and the ECU does the math to do distance over time to miles per hour.

There may be some requirement but what that means is the menacing tolerance factor on a new vehicle must stack up to be more of a - 0/+x tolerance call out where x is some variance in design.

Manufactures don't purpusfuly make car speedometers off.

I have 4 vehicles, used a good high quality GPS sending unit and my SVT and 2018 Explorer are dead on. My Jeeps speedometer is a hair slower than speedo because the speedo gear for my upgraded 33" tires is not an exact replacement. My ZX3 speedoshows slower but am going faster due to change in final drive gear ring on the differential and running different tire size.

Also not all 215/44R17 tires are the same size. You will see tire rack provides different rotations per mile and different total diameters for different tire makes and manufactures even though they are a 215/45R17. So u less you are the same OEM tire you have a chance for the speedo to be off.
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Old 01-27-2018, 01:15 PM   #18
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Quote:
Originally Posted by Magus2727 View Post
Does not even mater on "certified" speedometers. There is a reason why police still have to use radar detectors and not just say I pulled up along side him and my speedo on my vehicle showed 75 so I busted him for 5 over....

Also a reason why most police officers don't go after people who are a few miles over as there is variations that the owner may not know by a few MPH. however 8+ or 10+ is something the driver should know and also be able to observe by other traffic.

..........
Except for IOWA State Troopers

While passing through Iowa in any of my rides with "out-of-state" plates simply moving at 5-over and any window tint.....OR for no front plate [AL, AZ, GA, IN, KY, MI, MS, NM, OK, PA, TN etc.... are all "one-plate" states!]

I get pulled over 5 or 10 minutes into the state and/or even leaving the state.....
I have had this happen to me practically every time I pass through this state


I don't say much to these troopers; I just let them rant about why their stop is justifiable and move on.... Still doing my 5 over right in front of them again when pulling back onto the expressway after the stop.
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Old 01-27-2018, 03:42 PM   #19
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i avoid Iowa like the plage they are like f*(#ing fleas to a pet when its Canadian plates and they dont understand we use more then standard drivers licence.. last time i drove past they held me for a "supposed" falsified Licence only to find out its a EDL and its nothing like a normal licence (idiots)

either way i ran my jag which is on the proper tires with stock rims using my bluetooth OBDII then ran my Focus and oddly enough my focus with the oversized tires was closer the the GPS reading of the speed ( i have an app that shows vehicle sensor speed on the left and gps speed on the right) the jag was off by about 6-7 at all times
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Old 01-31-2018, 07:28 PM   #20
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Bring up the test mode on the instrument cluster, go to mph and watch it as you drive. The speedo does show a different speed as the numerical shows, must be common for the focus, I've heard others with the same issue.

Mine is worse at a lower speed and gets closer to accurate at a higher number, at 75ish it's only about 2 mph off, and at 25 the speedo will show about 30.

Took me a while to figure that out also, I always wondered why people were up my ass when the speedo showed 25... When I go back and forth from home and college I bring up the test mode and it's really nice.
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crazy how something so simple can be over looked and cause so much trouble

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