Speedo drive

miktdish · Nov 19, 2024

So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?

julianf · Nov 19, 2024

miktdish said:
So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?

The nicest option would be one of the vdo ones with an electronic sender, like the 300 disco.

No more jumpy needle either.

They're about £170 though. Maybe even more.

But, to answer your question, there's certainly a website somewhere with photos of all the drives and descriptions. I just can't remember where (so it doesn't actually answer your question at all!)

If you're thinking of swapping them, start applying penetrating oil now, and, in 3 months time, when you finally get around to the job, it may only take you 3 hours to get it out.

miktdish · Nov 19, 2024

I have an advantage ....
It was all new in August ...

WhatsApp Image 2024-08-07 at 17.32.11_c10750ae.jpg

New (to me) LT230

I picked up a 'refurbed' transfer box the other day. The suffix is 22D, which is 1:141, the same as a 13D. My question is - what is the difference ?

www.landyzone.co.uk

dag019 · Nov 19, 2024

miktdish said:
So here I am tootling along in the D90 and the speedo says 65mph.
Which is nice.

Bur Mr GPS says 57mph, which is a bit different ...

I think (can't remember) I have a blue cog.
I think I need more teeth (?)

A yellow (2 more) or a Red (3 more) ?

You are over reading by 14% based on the speeds you have given.
yellow will give a 10% decrease in indicated speed based on having a blue currently so 57mph GPS will be 58.5mph indicated
Red will give a 15% decrease in indicated speed based on having a blue currently so 57mph GPS will be 55.25mph indicated

miktdish · Nov 19, 2024

Dammit. that's the expensive one (yellow) ..... cheers

tottot · Nov 19, 2024

GPS signal can have some delay so make comparisons over some distance at constant speed.

Speedo drive

miktdish

Guns n Chainsaws

julianf

Well-Known Member

miktdish

Guns n Chainsaws

New (to me) LT230

dag019

Well-Known Member

miktdish

Guns n Chainsaws

tottot

Well-Known Member

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