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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
Speedo calibration
OK, I've changed the transfer box this week from my 90 Td5 (1.4 gearing) for a Discovery one (1.2 gearing), works very well, very pleased with the results, only thing is the speedo is reading about 10% too slow compared to a GPS trial. When doing 55 on the GPS the speedo's reading 50 and so on.

I'm running 235/85/16's at the moment.

I put the green transducer from the Defender box onto the Disco transfer box, is there a way of recalibrating it?
Is it a case of swapping the speedo drive to a different one?
Also, will it give me low mileage in the long run?!!

Last edited by Lambley on 25th May 2013 11:10pm. Edited 1 time in total
Post #238583 25th May 2013 9:00pm
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6074
United Kingdom 2006 Defender 110 Td5 SW Epsom Green
My 110 and 90 also does the same thing.

If i fit my 255/85's, then the speedo is spot on with the GPS
Post #238585 25th May 2013 9:11pm
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dorstsmith2



Member Since: 06 Aug 2012
Location: On the third rock from the sun in dorset
Posts: 188
United Kingdom 2003 Defender 90 Td5 HT Caledonian Blue
Speed calibration
This may help


Land Rover 90/110 speedo drive gears
• Colour: blue/20 teeth - Part number: FRC3310 - Tyres: 7.50/16 or 235/85/16
• Colour: green/21 teeth - Part number: FRC3311
• Colour: yellow/22 teeth - Part number: FRC3312 - Tyres: 205/16 tyres
• Colour: red/24 teeth - Part number: FRC3313

Thumbs Up
Post #238586 25th May 2013 9:14pm
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VeeTee



Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512
Netherlands 
You can change the speedo drive for one with more or less teeth, calculate the correct ratio / number of teeth according to your measurements.

90/110 speedo drive gears
frc3310 blue ------- 20 teeth -- 7.50,235/85 or 255/85 tyres 20D & 22D transfer box
frc3311 green ------ 21 -- all 90 vehicles excepth the 50th ann edition.
frc3312 yellow ----- 22 -- 90 with 205 x 16 tyres
frc3313 red -------- 24 -- 32D transfer box

Discovery 1 [200Tdi/V8]
frc3310 blue ------- 20 -- diesel
frc9339 ------------ 23 -- [see note]

frc3310 blue ------- 20 -- V8 efi
frc9339 ------------ 23 -- V8 twin carb

Note frc9339 diesel for gulf states vehicles,no colour code listed, auto trans Tdi vehicles


Edit: @dorstsmith2: I have to learn to type faster! Laughing Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite
Post #238588 25th May 2013 9:21pm
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dorstsmith2



Member Since: 06 Aug 2012
Location: On the third rock from the sun in dorset
Posts: 188
United Kingdom 2003 Defender 90 Td5 HT Caledonian Blue
Speed calibration
snap Thumbs Up in hare and tortoise, tortoise always wins Whistle Rolling with laughter
Post #238590 25th May 2013 9:23pm
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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
^^^

Thanks for the replies, I guess I'll have to remove/look at the one on the car at the moment and work out which one I'll need, will the one from the original 90 Def box fit and read ok or will the gearing make it read wrong? Sorry if that doesn't make sense.
Post #238618 25th May 2013 11:30pm
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davew



Member Since: 02 Jan 2012
Location: North Yorkshire
Posts: 888
England 1990 Defender 90 V8 Petrol PU Auto Rioja Red
If your original transfer box read correctly then just use the speedo drive gear from that one. The speedo drive is on the output of the transfer box so the ratio of the transfer box has no effect on the speedo. http://www.yorkshireoffroadclub.net/
Post #238620 25th May 2013 11:43pm
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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
davew wrote:
If your original transfer box read correctly then just use the speedo drive gear from that one. The speedo drive is on the output of the transfer box so the ratio of the transfer box has no effect on the speedo.


Ok, thanks davew, that makes sense, cheers for the reply. Thumbs Up
Post #238621 25th May 2013 11:47pm
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VeeTee



Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512
Netherlands 
What colour speedo drive is fitted now? Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite
Post #238622 25th May 2013 11:51pm
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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
Not sure, I've not taken it out to look at it to be honest, I just swapped the sensors over, black to green.
Post #238623 25th May 2013 11:53pm
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VeeTee



Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512
Netherlands 
Think it will be OK iff you put in the original speedo drive from the Disco transfer box. Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite
Post #238626 26th May 2013 12:04am
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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
VeeTee wrote:
Think it will be OK iff you put in the original speedo drive from the Disco transfer box.

You mean the one out of the defender box?!!
Post #238627 26th May 2013 12:07am
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VeeTee



Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512
Netherlands 
Sorry, yes the original from the Defender tbox. Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite
Post #238630 26th May 2013 12:25am
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Lambley



Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435
United Kingdom 2006 Defender 90 Td5 HT Java Black
VeeTee wrote:
Sorry, yes the original from the Defender tbox.
thanks VeeTee, I'll do it tomorrow. Thumbs Up

So, does that mean that my mileometer is out too at the moment? If so, I'm getting 10% better fuel economy than I thought?
Post #238631 26th May 2013 12:45am
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big steve



Member Since: 24 Dec 2009
Location: hertfordshire
Posts: 2456
United Kingdom 2015 Defender 90 Puma 2.2 HT Montalcino Red
I think in most cars you will find the GPS is 5mph in front of your clocks most car company give as much as 10% on clocks

My yaris reads 70?but GPS reads 64-65

Steve 2015 2.2 tdci hardtop xs
3.2 conversion DONE 238bhp and 707nm torque and thats just the start ;-P
hybrid turbo in build -done ready to fit
ashcroft atb in transfer box
6 speed auto in build
Post #238662 26th May 2013 11:26am
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