Mud-club

Vehicle & Technical => Discovery => Topic started by: Tyke on May 11, 2006, 11:30:56

Title: Speedo Gearing
Post by: Tyke on May 11, 2006, 11:30:56

Would it be right to asume that if bigger tyres are fitted and the speedo is running at about 10% error from standard then the milage being counted will also be out by 10%?

I heard you can get the speedo recalibrated . . . . . is this also true and who does it ?

Cheers  :wink:

Title: Speedo Gearing
Post by: Budgie on May 11, 2006, 13:42:52

Yes the mileage will be out as well as the speed reading.

If/when you change the transfer box, to a 1.44:1 then the speedo gearing will come back in if you use the speedo gear from your 1.22:1 box.
I think mine reads about 2mph fast according to my GPS.

I spoke to Ashcrofts about this when I did mine and they said that if I supply them with the T-box ratio, type of gear box, diff ratios and tyre sizes then they could supply a speedo gear to suit.
With mine only being 2mph out then I've not bothered though.  :wink:

Title: Speedo Gearing
Post by: hobbit on May 11, 2006, 14:10:35

Use the gps and put paint marks on the dial to let you know your true speeds :wink:

Title: Speedo Gearing
Post by: Tyke on May 11, 2006, 14:14:02

Cool, your a star fella.

I thought that would be the case. I'll keep it in mind when I get to swap the box and make sure the standard speedo gear goes back in.

Think I've thought through everything, now it's just a case of time and money to get the job sorted.

Title: Speedo Gearing
Post by: Tyke on May 11, 2006, 14:18:18

Quote

Use the gps and put paint marks on the dial to let you knwo your true speeds

That could well be a quick fix untill I do the other job - cheers  :wink:


Now just have to 'borrow' a mates gps  :oops:

Title: Speedo Gearing
Post by: Jim-Willy on May 12, 2006, 00:32:32

Quote from: "Tyke"

Quote

Use the gps and put paint marks on the dial to let you knwo your true speeds

That could well be a quick fix untill I do the other job - cheers  :wink:


Now just have to 'borrow' a mates gps  :oops:

I have one Tyke if You have a prob getting one........

Title: Speedo Gearing
Post by: Tyke on May 12, 2006, 08:29:31

Might take you up on that JW - Cheers.


You have a good weekend last week?

Title: Speedo Gearing
Post by: Jim-Willy on May 12, 2006, 15:50:53

Very good weekend, no water at all at ribblehead though which is a bit scary.  I will bring GPS to next meet, if you need if before gimme a bell.

Title: Speedo Gearing
Post by: defenderdan on May 12, 2006, 22:38:29

If the larger tyre you are changing to is still a standard landrover fitment (ie. changing from 205's to 265's) Then just change tho speedo drive gear in the transfer box. It takes 5 minutes and costs about eight quid.

Title: Speedo Gearing
Post by: fatusbloke on May 13, 2006, 23:08:09

TRy this as well, also tyre size calculator on here as well

http://www.4lo.com/calc/gearspeedo.htm

Title: Speedo Gearing
Post by: Tyke on May 15, 2006, 10:00:12

Jim . . . . will see you at next meet mate, I'm away again this weekend so won't be about . . . . . off 'darn sarf' mate :wink:


Speedo calculator confirms what I thought . . . . it's about 10% out at the moment . . . . 70mph = 76mph . . . .  :shock:  
 
Not that I drive around at that speed on muds . . . . . well not all the time anyway . . . . That right Jim Willy? . . . . and deffo not on those square shaped Grizzly's  :lol:  :lol:  :lol:


Cheers for your input lads, most appreciated  :)