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morrisman1 I can steer now
Joined: 12 Jul 2007 Posts: 201 Location: Invercargill, New Zealand
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Posted: Tue Sep 09, 2008 8:41 pm Post subject: speedo error with datsun gearbox |
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hi
my ute has the combination of 175/70r13 tyres, a 3.9:1 toyota diff, datsun 4 speed gearbox and morry speedo. does anyone know what sort of speedo error i would get with this combination? im sure that someone here has a morry with a datsun gearbox and morry speedo!
cheers,
Cameron
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John Ballard valued contributor
Joined: 11 Feb 2004 Posts: 2646 Location: Dubbo NSW
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morrisman1 I can steer now
Joined: 12 Jul 2007 Posts: 201 Location: Invercargill, New Zealand
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Posted: Tue Sep 09, 2008 9:15 pm Post subject: |
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when they calibrate the speedo, does it correct the odometer aswell? im trying to find out whether there are replacement gears available for the datsun gearbox to correct the cable ratio if possible. i guess ill get it on the road in the mean time but it will have to be pretty accurate to get through certification.
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Triumph Man valued contributor
Joined: 13 Sep 2003 Posts: 1890
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Triumph Man valued contributor
Joined: 13 Sep 2003 Posts: 1890
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Auspest I've got trainer wheels
Joined: 19 Jan 2008 Posts: 15 Location: Brisbane
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Posted: Sun Sep 14, 2008 8:29 pm Post subject: |
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Had the speedo repaired in my sprite a number of months ago, I have Datsun running gear in it. You can get the ODO calibrated as wel but my guy said they are running out of gear parts so sometimes can only get close.
Also got little red dots put at every 20km/hr mark so makes it easy to read in kms
Ratio box may be the way to go for futyre changes
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tortron Got the hang of this ...
Joined: 02 Mar 2008 Posts: 280 Location: New Zealand
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morrisman1 I can steer now
Joined: 12 Jul 2007 Posts: 201 Location: Invercargill, New Zealand
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Posted: Sun Sep 14, 2008 9:16 pm Post subject: |
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ive got a mate in the signwriting business so he could possibly make something up for me. the odometer would still be out though
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Boeing Bob Got the hang of this ...
Joined: 08 Jul 2007 Posts: 284 Location: SYDNEY, AUSTRALIA
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Posted: Sun Sep 14, 2008 10:50 pm Post subject: |
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Like the old story about the bumble bee. Aorodynamically, it is impossible for a bumble to fly, but as he knows nothing about aerodynamics, so he goes ahead and does it anyway. A similar thing can be said about speedos. My van has a Sprite diff and 13" wheels. I took the van to my local instrument man, he removed the speedo, connected a "revolutions counter" and we drove around his measured 1 Kilometer track. At the end, he did some quick calculations and said " I need a gear wth X number of teeth to which I said, "where will you get that?" "Simple", sez he, "I'll make one". There's nothing wrong with my speedo.
I also had a similar problem a few years ago with the depth sounder on my boat when an el cheapo plastic gear sheared. I took it to a gear cutter and he made me up a nice new brass one. Once again, no problem. As the good book sez, "seek and ye shall find".
Many of these guys also have the facilities to make up completely new face plates if required or simply make alterations to your old ones.
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