Mileage accuracy

[pbnj]

I plan routes for my morning walk online using various apps to estimate miles walked. One route is 3.2 miles according to the sites, but I decided to verify it with the Vert yesterday. The bug said it was 2.5 miles, not 3.2. I took one of our other vehicles out that has a trip set, and it said it was exactly 3.2 miles. See the problem
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1977 Super Convertible

[Frank Bassman]

If your tires are not stock odds are your spedometer is now only useful for visual stimulation.... Unless the tire height itself is still like stock.

-Frank

[pbnj]

stock tires. Like you said, I guess its just there for grins
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1977 Super Convertible

[wcfvw69]

The good news is rebuilt, accurate speedometers are plentiful and cheap.
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[Relyt]

Our cars left the factory with bias ply tires that are a bit taller than the normal replacement 165/80r15. So the mileage will never be 100% on unless you get some bias ply.
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69 Beetle - Daily driver
1600 SP (unknown history)
30 PICT 1 w/power circuit (Volkzbitz)
205T (Bill)

[wcfvw69]

[glutamodo]

Odometers did get calibrated for smaller tires as time went on. the old 1950s/60s W0.80 rating changed 0.82 and then 0.825 (or 825 on the speedometer face) and the higher that number the smaller the diameter tire.
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Andy T.


IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox.

[Tim Donahoe]

Just figure out the percentage that it's off and add that to the total.

Compare, say 100 miles (according to your GPS), and if your odometer says 80 miles, then you know you're 20% off. Add 20% to your mileage for tune up, oil changes, etc.

Tim
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Let's do the Time Warp again!

Richard O'Brien

[Relyt]

[pbnj]

Thanks for the replies. I keep the tires at about at 25psi. I figure I lose about .2 per mile, but I will have to take another look at it later. If this has always been the case since 77, its off about 15000 based on the current reading of about 75000. Since I have no idea on the history of the bug, I can't really say what the actual mileage is. It was about 71k when I picked it up last year and its almost at 76.k. That being said, I would say I've put on just under 5k in 11 months, and that seems right.
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1977 Super Convertible

[Joel]

In every 70s beetle speedo I've pulled down (7 now) the plastic odometer gear has been cracked and slips on the shaft when it gets around to the Crack hence the low reading, I'll bet yours has the same problem.
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Quick little bug, you got a Porsche motor in that?
1974 Germanlook 1303 2.5 Suba-Beetle

[pbnj]

Interesting. can it be repaired or does the speedo need to be replaced
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1977 Super Convertible

[glutamodo]

The gear can be replaced if you can find a replacement. I've not looked up the availability in a while but there used to be a couple of places that made replacement gears. (VW's problem was they changed to plastic, earlier speedometers used brass) I have a couple of threads where I talk about taking apart the speedometers, the one for the late model speedo is here:

http://www.thesamba.com/vw/forum/viewtopic.php?t=179776&

and from that, here's the infamous cracked odometer gear.

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Andy T.


IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox.

[homeboymi]

[pbnj]

Thanks again for the feedback. I'm just not sure when this all started, but it doesn't really matter at this point.
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1977 Super Convertible