Welcome to the Irish Mini Owners Club Forum. Keep an eye out of on coming events!!!!
Calibrating Speedo
Moderators: spud1979, The Marcos Graveyard, Moderators
- woody
- IMOC Paid Member
- Posts: 2820
- Joined: Mon Feb 07, 2005 11:55 pm
- Whats your location?: Drogheda
- Region: Eastern
- What Minis have you?: Traveller
Turbo
Hornet
Equinox
MINI Clubman - Location: LOUTH
- Contact:
Calibrating Speedo
I found a great website to help sort out you speedo if your changing clocks, engins or wheelsize.
The speedo drive in the gearbox consists of two parts ,a worm and a cog and by changing them you can change the ratio output to the speedo. On this page if you input your wheelsize, final drive and speedo tpm you can then try different ratios to get the closest match between speed and speedo reading.Ideally this could be done when the engine is out but I managed to do mine on an A+ box in the car although it did have a flip front. My speedo has gone from 15% to 2% accuritcy.
http://www.guess-works.com/Gearbox/Technical/ratio.htm
The speedo drive in the gearbox consists of two parts ,a worm and a cog and by changing them you can change the ratio output to the speedo. On this page if you input your wheelsize, final drive and speedo tpm you can then try different ratios to get the closest match between speed and speedo reading.Ideally this could be done when the engine is out but I managed to do mine on an A+ box in the car although it did have a flip front. My speedo has gone from 15% to 2% accuritcy.
http://www.guess-works.com/Gearbox/Technical/ratio.htm
Last edited by woody on Wed Apr 21, 2010 11:13 pm, edited 1 time in total.
TECHNICAL MODERATOR
-
- NON Member
- Posts: 80
- Joined: Mon Mar 01, 2010 11:43 pm
- What Minis have you?: 99' Cooper Sports Pack
95' Sidewalk - Contact:
Re: Calibrating Speedo
Where abouts on the site is that info dude?!!
Re: Calibrating Speedo
Can you open the zip??
[quote="macker"]i have a program at home in a zip file that can do that for you[/quote]
[quote="macker"]i have a program at home in a zip file that can do that for you[/quote]
- keith
- NON Member
- Posts: 2116
- Joined: Tue Jul 18, 2006 11:15 pm
- Whats your location?: Dún Laoghaire, Dublin
- Region: Eastern
- What Minis have you?: '93 SPi cooper
- Location: Dún Laoghaire, Dublin
- Contact:
Re: Calibrating Speedo
i find the Co. Council very useful for this: they have helpfully put up a number of screens displaying your speed as you approach it.
A really useful one is on Clonkeen Road, which is a good straight stretch... so you can "calibrate" at a range of different speeds.
It has an annoying habit of showing in RED most of the time I approach it.
i haven't a clue what diff i have in, the engine number is missing, presumed lost, off the block. its an mg metro lump, with 12" wheels.
A really useful one is on Clonkeen Road, which is a good straight stretch... so you can "calibrate" at a range of different speeds.
It has an annoying habit of showing in RED most of the time I approach it.
i haven't a clue what diff i have in, the engine number is missing, presumed lost, off the block. its an mg metro lump, with 12" wheels.
Last edited by keith on Tue Apr 20, 2010 11:12 am, edited 1 time in total.
- The Marcos Graveyard
- IMOC Paid Member
- Posts: 4718
- Joined: Fri Feb 04, 2005 10:05 am
- Whats your location?: Longford
- Region: Eastern
- What Minis have you?: 1971 Mini Marcos.
1984 Mini Sprite - Modifications: 1380cc
Weber45
S/C CR gearbox and drop gears - Location: Longford
- Contact:
Re: Calibrating Speedo
Probably a 3.1 or 2.9 diff.
Sometimes there is a sticker on the back of the diff casing to tell you the ratio.
Sometimes there is a sticker on the back of the diff casing to tell you the ratio.
- woody
- IMOC Paid Member
- Posts: 2820
- Joined: Mon Feb 07, 2005 11:55 pm
- Whats your location?: Drogheda
- Region: Eastern
- What Minis have you?: Traveller
Turbo
Hornet
Equinox
MINI Clubman - Location: LOUTH
- Contact:
Re: Calibrating Speedo
Sorry I posted the wrong link, have edited in the right one.
TECHNICAL MODERATOR
- keith
- NON Member
- Posts: 2116
- Joined: Tue Jul 18, 2006 11:15 pm
- Whats your location?: Dún Laoghaire, Dublin
- Region: Eastern
- What Minis have you?: '93 SPi cooper
- Location: Dún Laoghaire, Dublin
- Contact:
Re: Calibrating Speedo
brilliant link!woody wrote:Sorry I posted the wrong link, have edited in the right one.
http://www.guess-works.com/Gearbox/Technical/ratio.htm
turns out its 12H996AA which is MG Metro A+ with 3.44 diff.
Who is online
Users browsing this forum: No registered users and 2 guests