MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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rkas3882
randy kassed

(47 posts)

Registered:
05/30/2010 09:14AM

Main British Car:
1973 mgb gt rover 3.5

mgb speedo calibration
Posted by: rkas3882
Date: April 06, 2012 09:53PM

Hey guys, I have the lt77 transmission and to start with im going to be using the stock b rear end, does anybody have the info for how many turns the speedo cable makes for calibration purposes? I figured if somebody has this set up info it would be lots easier than having to lay out marks on the ground and tire and push the car along etc. thanks
Randy


NCtim
Tim Shumbera
Western North Carolina
(154 posts)

Registered:
01/19/2012 04:35PM

Main British Car:
Re: mgb speedo calibration
Posted by: NCtim
Date: April 08, 2012 08:54PM

Randy,

There are charts on the internet if you know your tire diameter. I believe someone posted one on this website a few years ago that you can plug your specs into and it tells you how fast you're going at any rpm. I thought I saved it but couldn't find it. Sorry.

Tim


kill r b
Dann Wade
West Carrollton, Ohio
(34 posts)

Registered:
02/16/2012 07:57PM

Main British Car:
1979 MGB ROADSTER 3500 V6

Re: mgb speedo calibration
Posted by: kill r b
Date: April 08, 2012 11:28PM

It seems to me that the ratio is imprinted centerpoint on the face of the speedo, at the bottom.
Brian McCullough at BMC does MGB V6 conversions and sells the parts so you can do them yourself


pspeaks
Paul Speaks
Dallas, Texas
(470 posts)

Registered:
07/20/2009 06:40PM

Main British Car:
1972 MGB-GT 1979 Ford 302

authors avatar
Re: mgb speedo calibration
Posted by: pspeaks
Date: April 09, 2012 09:59AM

I’m not all that familiar with your transmission and maybe this won’t help, but all information is worth something I guess. Below is a website with a formula on how to do it for different transmissions. Remember when you told your high school math teacher you would never need algebra; OH Well !!! Hope it helps, but if it doesn’t, sorry, maybe it will help someone else. The formula below is for a GM automatic I think, I tried to remove the picture but it won't let me. Go to the website Paul [www.transmissioncenter.net]



Edited 6 time(s). Last edit at 04/09/2012 10:29AM by pspeaks.


pspeaks
Paul Speaks
Dallas, Texas
(470 posts)

Registered:
07/20/2009 06:40PM

Main British Car:
1972 MGB-GT 1979 Ford 302

authors avatar
Re: mgb speedo calibration
Posted by: pspeaks
Date: April 09, 2012 10:30AM

As it turns out, the wrong picture did go away, sorry!


Paul


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