5 replies to this topic

[Antman]

So If my speedo is reading low I need to swap my gear drive on my speedo cable for one with more teeth?

[claysummers]

More teeth means the cable turns slower, so no. That will make your speedo read lower. Average number of teeth around 20, so for each increment of one tooth you change the reading by 5%. Simples.


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[Gatti]

Those links don't work for me but heres one that has the calculator on the left on the Rare Spares site.

 

https://www.rarespar...edo gear&page=1

 

I'm changing to a 3.55 diff on my LJ with M20 gearbox.

 

The Rare Spares site mentions "Drive Gear" and "Driven Gear". Which one is the gearbox end and which is the dashboard end?

 

Does that mean I need to change gears at the gearbox and dashboard end of the speedo cable?

Edited by Gatti, 02 February 2020 - 11:59 AM.

[claysummers]

You a re changing ratio by 15% therefore you require a driven gear with three more teeth than the one you are currently running. This assumes your current setup is reading correctly. You don't need to replace the internal driven gear, only the driven gear which sits on the gearbox end of the cable.

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[Gatti]

You a re changing ratio by 15% therefore you require a driven gear with three more teeth than the one you are currently running. This assumes your current setup is reading correctly. You don't need to replace the internal driven gear, only the driven gear which sits on the gearbox end of the cable.

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Thanks mate