Speedo correction 2010 TDI Jetta

[rigor]

more infoHi people I know this has been discussed before but I need to vent a bit and still resolve the issue.
My Jetta has just had the 1500K checkup! no problems other than the 7% speedo error that we all know about. I asked the service manager about correcting the problem and the answer was " the cluster is a sealed unit and can't be changed" I explained that is a simple re-programming useing Vag Com, long story short they refuse to do it.
I am not a violent person but sometimes the thoughts are there.
Now before everybody tells me to get used to it and I'm a whinger I would like to say (being a Techie for all of my working life) what strange philosophy dictates that a meter/speedo should read other than accurately , should I expect a voltmeter to read say 300volts when the actual voltage is 200volts so I don't get as big a shock if I make a mistake! what complete nonsense. OK big breath, rant over. Can anybody in Brisbane please advise me where I can go to have this problem sorted, yes I am a pedant and I want an accurate speedo.

Cheers Dave L.

PS The wifes 89 Camry is within 1 KPH at 100Ks My 98 Isuzu is so close to spot on I cant pick it, the daughters Mk1 and Mk2 golf speedos are within 2 KPH at 100Ks. my 2010 Jetta is 7Ks out at 100 Ks. Thats what I call progress. if I choose to drive above or below the posted limit that is my decision not VWA.

[team_v]

I believe logger posted the details on this previously, have a quick search.


the general consensus is to just deal with it as it will save you from speeding fines.
alternatively, you could upsize your wheel/tyre size to discount half of the error or just drive a bit quicker.
7% isn't much though, it would only be noticable after say 60km/h.

[rigor]

Yeh I know 7% isn't much but I find it realy annoying , I suppose my point is that a meter should be accurate and I make the decision whether to drive above or below the speed limit and I don't need a hedge factor built in. Thanks for the reply.

Dave L.

[Getti]

Yeh I know 7% isn't much but I find it realy annoying , I suppose my point is that a meter should be accurate and I make the decision whether to drive above or below the speed limit and I don't need a hedge factor built in. Thanks for the reply.

Dave L.

I understand your frustration, and after travelling 47,000kms I have learned to deal with it ... probably to the point where if it were fixed now I would be speading constantly as I am now used to compensating for the speedo "error".

For me, when I am cruising on the highway I use the reading from the air-conditioner temperature display to show me my actual speed (there are full instructions somewhere on here). Otherwise around town at 60kms per hour the margin is small.

Otherwise, as mentioned another option is the tyre size. I have read that changing the 225's to 235's on the 17" wheels on my GTI will bring the speedo close to spot on. I have not reached the point where I need to replace tyres yet, so I can't comment further.

Anyway, I guess the above is no real solution ... but ways to work around the problem.

[idaho]

We have the Kufatec Bluetooth with the extra gauges add-in (which is available by itself). We basically run that page on the display all the time as it shows oil temp, coolant temp, etc along with the Canbus (real?) speed.

[Getti]

We have the Kufatec Bluetooth with the extra gauges add-in (which is available by itself). We basically run that page on the display all the time as it shows oil temp, coolant temp, etc along with the Canbus (real?) speed.

Idaho, are you able to provide a link to the Kufatec Bluetooth that you use? Thanks.

[PhillipAudiDealer]

I believe ADR rules must have the Speedo reading faster than it should by up to 10%. I am sure I have read this on another thread. Mavrick I think knows all about it.

[team_v]

I also believe there are ADR compliance rules that state a speedo must have an error factor built in so it is not just your car/VW that does it.

[bazzle]

ADR error is just that the max error allowed. Speedos can be 100% accurate.

My 7% error was thru all speed ranges.

I fixed my R32 Golf. Sitting on the freeway with cars flashing lights behind made me investigate the error.
Dealer even tried to help BUT their system does not show them where to adj like you can in VCDS.

The WD6050 head unit I fitted has Igo 8.3.4 and a Gurjon skin that has an option for a large digital speedo. Accurate to gps (not canbus ) This at least showed me my correct speed.

To fix the speedo firstly I adjusted the ratio in VCDS.
This dropped from 107kph to 104kph.
I then opened instrument panel front and moved needle back one notch.
104kph to 102kph.

http://www.myturbodiesel.com/1000q/a5/speedometer-read-fast-adjustment-VW.htm

http://forums.tdiclub.com/showthread.php?t=158652

When I changed from 225/40/18 to 235/40/18 tyres speedo is now spot on
Tire size calculator

Bazzle

[idaho]

Idaho, are you able to provide a link to the Kufatec Bluetooth that you use? Thanks.

Here is the link to the Bluetooth + DIS add-on: KUFATEC GmbH & Co. KG - FISCON Freisprecheinrichtung Volkswagen, Skoda "Basic" 36495

Here is the link to the DIS add-on: KUFATEC GmbH & Co. KG - E-MFA Anzeige von Ladedruck, Öltemperatur uvm. im Tacho 36810

Note thought that the DIS add-on is only suitable for red full height MFD's.

[maca]

Your 2010 Jetta should have the digital speedo in the MFD, is that out along with the anologue one?

[Declanny]

The 2010 Jetta does have the digital speedo in the MFD. Is this the correct speed, or is this out by 7% too?

[rory]

I'm with Dave (rigor)
I think its a bit of an insult by VW to think we need protection from ourselves by giving us overreading speedos, and imposing on us extra mental arithmetic whilst trying to enjoy our drive.
I'm convinced VW can build an accurate speedo-seems Jettas all read + 7% (like mine)
Since having my Jetta since last April I've been looking around when I see one to see who are the other people who drive Jettas; and often on the freeway I see little old ladies poking along at about 100 on the 110 section. I thought; oh well they're little old ladies and thats the way they drive.
I've changed my mind on that one; they've dialled up 110 on their cruise and are sitting there blissfully watching all those youngsters "speeding" past.
As a pilot I've learnt that overeading speed indicators can kill;
adding to my dislike of the one in the car I drive.
Anyone that comes up with a quick fix: I'd be happy to hear of it. Don't want to pull anything apart; replace wheels or tyre sizes from original.
Cheers guys
rory.

[Mountainman]

I'm with Dave (rigor)
I think its a bit of an insult by VW to think we need protection from ourselves

It's not just VW - they all seem to be now. Indicating 100 at a true 92-95 seems to be the norm in most cars now. Both my Forester and Golf are out 7% at 100 and it really annoys me. My wife's ex 90's Camry was dead accurate to 140. The funny thing is the Forester's odometer is only optimistic by 1.3% and I haven't checked the Golf's yet.

[MSR]

Not all over read. The STi is spot on.

All motorbikes appear to have the 7.5% error built in but it is all of a $100 to get a plug in speedo healer. The fact that so many change sprocket sizes probably creates more of a market but surely someone would be able to adapt one to fit a car.

My biggest concern would be the inflated odometer reading potentially harming resale value. I suspect it probably accounts for much of the error between the computer calculated fuel consumption and actual fuel consumption to.