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mbw65bug
Samba Member
Joined: December 19, 2013
Posts: 25
Location: Japan Hokkaido
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 Posted: Mon Aug 31, 2015 9:44 pm Post subject: Speedo adjustment |
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Hi.
I'm running 145/65 tires for the front and 195/65 for the rears. Naturally the speedo ain't show correct speed any longer.
I looked for an adjuster in both U.S. and Japan market, got nothing apart from ones for Fords or Chevrolets; so I asked a friend help showing pictures of them.
He made this out of DURACON (https://en.m.wikipedia.org/wiki/Polyoxymethylene), he said that way less worries about wearing of gears and it would be easier than steel to make.
I can't wait to see how it works. |
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mbw65bug
Samba Member
Joined: December 19, 2013
Posts: 25
Location: Japan Hokkaido
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| Posted: Mon Aug 31, 2015 10:36 pm Post subject: |
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Here are pics of inside parts.
Note the main body part is flipped, the inlet should be 20T to decrease speed.
He 'cooked' this in dyer.
Yeah, we're Japanese so use chopsticks.  |
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[email protected]
Samba Member
Joined: June 02, 2011
Posts: 1593
Location: Louisville, ky
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| Posted: Mon Aug 31, 2015 11:30 pm Post subject: |
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Beautiful work.
Doesn't this end up reversing the direction of the spin? |
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mbw65bug
Samba Member
Joined: December 19, 2013
Posts: 25
Location: Japan Hokkaido
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| Posted: Mon Aug 31, 2015 11:59 pm Post subject: |
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| [email protected] wrote: |
Beautiful work.
Doesn't this end up reversing the direction of the spin? |
!!!!
That's true. 
Thanks for posting, I will probably end up making hole through the right spindle so the wire can spin the opposite way. |
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mbw65bug
Samba Member
Joined: December 19, 2013
Posts: 25
Location: Japan Hokkaido
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| Posted: Tue Sep 29, 2015 6:55 am Post subject: |
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I thought I would drill hole into the right spindle, but that way it could be weakened so we decided to do from the scratch.
He added one more gear so the direction of spin is now fixed.  |
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jason
Samba Member
Joined: August 07, 2002
Posts: 3444
Location: Garage
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| Posted: Tue Sep 29, 2015 7:50 am Post subject: |
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| I thought you just adjust the magnet in the speedo, done. |
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Keith
Samba Member
Joined: August 15, 2005
Posts: 3634
Location: Brodheadsville, PA
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| Posted: Tue Sep 29, 2015 10:47 am Post subject: |
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This is nice but, you can just check your speed with a GPS like many of us have done and note how off your speedo is, mine is 5mph faster now with the 135's I am running so I know that if I am reading 55mph, I am actually going 60mph. Simple.
_________________
Formerly known in the forums as "OVALTEEN"
"I firmly believe that some villagers from Botswana could probably build a better road than PennDot."- Splitty
"If you do anything to your car someone will hate on you for it. People absolutely love to complain and find fault with others. Don't let it bother you. Just live and have fun."- Lind |
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glutamodo 
The Android
Joined: July 13, 2004
Posts: 26325
Location: Douglas, WY
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| Posted: Tue Sep 29, 2015 3:35 pm Post subject: |
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| jason wrote: |
| I thought you just adjust the magnet in the speedo, done. |
That will change the calibration of the speedometer needle, but the odometer would still be off. |
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jason
Samba Member
Joined: August 07, 2002
Posts: 3444
Location: Garage
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| Posted: Thu Oct 01, 2015 2:11 pm Post subject: |
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| How would it be off? If i go 10 mph for an hour, I've gone ten miles. The mileage is run by the same thing that runs the needle. |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26325
Location: Douglas, WY
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| Posted: Thu Oct 01, 2015 2:58 pm Post subject: |
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The cable spins the same for both, but inside the speedometer itself, the needle is not directly coupled to the wheel - it's run by magnetic inductance and the calibration is in the needle's return spring. Now, the odometer IS connected directly to the front wheel hub by worm gears and there is no adjustment that will change that. So you can vastly change the speedometer calibration and it will have zero effect on the odometer.
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Bob Loblaw
Samba Member
Joined: August 17, 2008
Posts: 865
Location: Vancouver Island, Canada
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| Posted: Thu Oct 01, 2015 3:25 pm Post subject: |
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| Keith wrote: |
| This is nice but, you can just check your speed with a GPS like many of us have done and note how off your speedo is, mine is 5mph faster now with the 135's I am running so I know that if I am reading 55mph, I am actually going 60mph. Simple. |
Swing and a miss. It can't read 5mph faster all through the range. It's a percentage thing. If you're going 10 mph will it read 15? If you're going 100 mph will it read 105? No. It's more like a 10% difference.
My '57, with 145/65/15s reads 40 mph when I'm doing 50kph (about 30mph). On the highway, when it reads 70mph, I'm at 90kph. (about 55mph) It's variable, get it?
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