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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old October 15th, 2017, 04:28   #1
Cmore
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Default speedometer not accurate

some place here TDI club forum I read about having the the speedo recalibrated. I am unable to locate this. I have a 05 Jetta , yes tires are the correct size. my speedo is reading 4 mph faster then what i am actually traveling, compared to another car following me.
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Old October 15th, 2017, 08:29   #2
JB05
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Has it always been like this? My Golf's speedo was a few mph's off when new according to the reading on my scan gauge. I've read here that this was intentional on VW's . I took the needle off while doing some other work to the cluster and repositioned the needle, but I was a little obsessed at the time.
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Old October 15th, 2017, 11:16   #3
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They all are and have been ever since the first MklV (2000) I've owned. Odometer is pretty close, so easier for me to ignore it. The speedo needle mod may be best option if a person is bothered by it.
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Old October 15th, 2017, 20:18   #4
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Quote:
Originally Posted by Cmore View Post
some place here TDI club forum I read about having the the speedo recalibrated. I am unable to locate this. I have a 05 Jetta , yes tires are the correct size. my speedo is reading 4 mph faster then what i am actually traveling, compared to another car following me.

If you have a smartphone you can download a GPS app to tell you the real speed. It should be about 2mph or so slower than the speedometer's reported speed. This is normal.

There is too much variance having someone follow you.
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Old October 16th, 2017, 08:21   #5
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The fixes have their drawbacks too. Adjusting the value with VCDS alters the odometer accuracy. Repositioning the needle only makes it accurate at one point. This is from memory from my old 2006 Jetta. Just learn to live with it.
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Old October 17th, 2017, 01:42   #6
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This is how it was designed by VW and what is actually built in into the cluster's software. Also, the coolant temperature gauge is even more inaccurate, if you ask.
This is NOT something what can be corrected with VCDS and/or tyre sizes.

There is a fix for both, though, the inaccurate speedo and inaccurate coolant temperature. But... It will require very expensive equipment in order to dump the EEPROM, do the required amendments and push it back, leaving alone the entire operation is very risky; you might end up with bricked cluster which the oly way to remedy is to throw into the trash bin.

Is it worth?
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Old October 17th, 2017, 02:25   #7
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If you use an Ultragauge or Scangauge II, etc, you can display your correct speed. I do this in my 06 Jetta, only because I wanted to fill an empty display slot on the Ultragauge, but it does display the unaltered speed. I'd have to go look, but I believe mine is off by 6 km, or about 4 mph. I don't even look at the factory speedo anymore.
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Old October 17th, 2017, 05:13   #8
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I've got slightly oversized tires with 215/55/16, IIRC 25.3" vs stock size of 24.9" OD. Using my GPS as a reference I'm within 1mph at highway speeds. The odometer is off a tad too, but I'm more interested
in having the speed correct as I'm mostly pushing 5-10mph over the limit.

I'm sure there are various options for "enforcement alerts",
but CB radio seems to have died a death, and I no longer have one.
Lol, and I have no interest in getting a phone that's smarter than me.

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Old October 17th, 2017, 07:19   #9
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In case of tyre sizes which are not among compatible ones, you can correct the odometer issue by adjusting the distance impulse number. The indicated speed will also be closer to reality but this is just a partial fix.
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