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Speedometer Calibration

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HarryO

Member Since: 06 Apr 2010
Location: Brisbane Australia 🇦🇺
Posts: 79

2015 Discovery 4 3.0 TDV6 Base 7 Seat Auto Fuji White

Speedometer Calibration

Hi All

I have added 265/65R18 BFG K02’s to my D4 TDV6 which is a bigger diameter tire (+ 41mm)

This has resulted in the speedo under reading by about 5%. Thought I would get used to compensating for this as I drove but 2 speeding fines later I concede that I was wrong.

I assume you can’t recalibrate the speedo electronically so my idea is to print a sticker to cover the markings on the speedo facia / dial - not sure if anyone has done this before but it should be easy enough.

Is the instrument cluster a sealed unit or can you get past the Perspex cover to access the dial / facia?

Cheers
Harry Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - it’s a built in anti-rust feature

Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
Defender 110 (Sold)
Series 2 (Chev 4.1 Motor & S2A Gearbox) (Sold)
Toyota Hilux bakkie (Ute) (Broke it)

26th Jul 2018 10:45 am

NJSS

Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10479

2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo Grey

Maybe start here:-

https://www.disco3.co.uk/forum/edit-ccf-re...35452.html

https://www.disco3.co.uk/forum/calibratin-speedometer-162209.html

https://www.disco3.co.uk/forum/speedo-accuracy-147195.html

NJSS Am I Gammon or Woke ? - I neither know nor care.

2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.

26th Jul 2018 11:04 am

Robbie

Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

2013 Discovery 4 3.0 SDV6 HSE Auto Baltic Blue

Things are easier and less risky than in the posts linked to above. Whilst it remains a critical parameter the IID will write to all locations for this particular parameter to keep the check valid (usually the IID only writes to the active CCF location). That said, it is not something I have used myself.

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26th Jul 2018 11:19 am

HarryO

Member Since: 06 Apr 2010
Location: Brisbane Australia 🇦🇺
Posts: 79

Thanks NJSS & Robbie

Far more scientific than my $1 sticker

.. but my head hurts now - will try get my head around it as I am not that computer literate and know even less about the cars systems. Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - it’s a built in anti-rust feature

Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
Defender 110 (Sold)
Series 2 (Chev 4.1 Motor & S2A Gearbox) (Sold)
Toyota Hilux bakkie (Ute) (Broke it)

26th Jul 2018 11:20 am

James1974

Member Since: 23 Nov 2017
Location: Stevenage
Posts: 990

2010 Discovery 4 3.0 TDV6 XS Auto Barolo Black

I carnt see spedos being that far
Out as when you go up in wheel size you go down in profile size my 22”s with 35 profile
Tyres are the
Same size as my old 19”s with standard tyres or there abouts and I don’t see any difference in my speed tomtom has always been 4-5 mph less when traveling at 60-70mph in all my vehicles due to gps lag and is still the same Disco 3 gone but not forGotten
Welcome disco 4
Flappy paddles working from gap
Heated steering wheel done
Bluetooth iPod connection done
Xeon lights (facelift) done
Afs retrofit done
Logic 7 retrofit done
Armrest fridge
Facelift rear lights
Retrofit High beam assist done
Genuine 22” Range Rover sport alloys
Retrofit acc (gave up not possible)
retrofit tpms done
Retrofit Range Rover lcd digital dash. Done
Retrofit blind spot assist done

7th Sep 2018 8:52 pm

HarryO

Member Since: 06 Apr 2010
Location: Brisbane Australia 🇦🇺
Posts: 79

I went up in width and profile from 255/55 R19 to 265/65 R18’s

I ended up testing my speedo against my GPS and an app on my phone - both showed that my speedo was fairly accurate even with the bigger tyres on!

The maths states that my speedo should have been under reading by 5.3% due to the bigger tyre circumstances - but it was not!

Can only conclude that what they say about manufacturers calibrating the speedo’s to underread slightly is true in my case.

I now have bigger tyres and an accurate speedo and didn’t change a thing - happy days.. Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - it’s a built in anti-rust feature

Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
Defender 110 (Sold)
Series 2 (Chev 4.1 Motor & S2A Gearbox) (Sold)
Toyota Hilux bakkie (Ute) (Broke it)

8th Sep 2018 12:41 am

James1974

Member Since: 23 Nov 2017
Location: Stevenage
Posts: 990

Going from 55/19 to 65 18 would mean they are their same
Size there abouts you went up 1 profile size and down a wheel size so would be roughly the same Disco 3 gone but not forGotten
Welcome disco 4
Flappy paddles working from gap
Heated steering wheel done
Bluetooth iPod connection done
Xeon lights (facelift) done
Afs retrofit done
Logic 7 retrofit done
Armrest fridge
Facelift rear lights
Retrofit High beam assist done
Genuine 22” Range Rover sport alloys
Retrofit acc (gave up not possible)
retrofit tpms done
Retrofit Range Rover lcd digital dash. Done
Retrofit blind spot assist done

8th Sep 2018 9:18 am

HarryO

Member Since: 06 Apr 2010
Location: Brisbane Australia 🇦🇺
Posts: 79

Hi James

Not according to this ...

Click image to enlarge

Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - it’s a built in anti-rust feature

Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
Defender 110 (Sold)
Series 2 (Chev 4.1 Motor & S2A Gearbox) (Sold)
Toyota Hilux bakkie (Ute) (Broke it)

8th Sep 2018 9:31 am

James1974

Member Since: 23 Nov 2017
Location: Stevenage
Posts: 990

Just gone from 19”s to 22” on mine and after checking that site it’s not even worth me changing it
At 70 mph I would only be going 73
At 30 I would be going 31 very minimal

Disco 3 gone but not forGotten
Welcome disco 4
Flappy paddles working from gap
Heated steering wheel done
Bluetooth iPod connection done
Xeon lights (facelift) done
Afs retrofit done
Logic 7 retrofit done
Armrest fridge
Facelift rear lights
Retrofit High beam assist done
Genuine 22” Range Rover sport alloys
Retrofit acc (gave up not possible)
retrofit tpms done
Retrofit Range Rover lcd digital dash. Done
Retrofit blind spot assist done

11th Sep 2018 10:15 pm

James1974

Member Since: 23 Nov 2017
Location: Stevenage
Posts: 990

Tbh every car or van I have ever drove at Speedo says 60 gps has always read 5mph lower than my speedo Disco 3 gone but not forGotten
Welcome disco 4
Flappy paddles working from gap
Heated steering wheel done
Bluetooth iPod connection done
Xeon lights (facelift) done
Afs retrofit done
Logic 7 retrofit done
Armrest fridge
Facelift rear lights
Retrofit High beam assist done
Genuine 22” Range Rover sport alloys
Retrofit acc (gave up not possible)
retrofit tpms done
Retrofit Range Rover lcd digital dash. Done
Retrofit blind spot assist done

11th Sep 2018 10:19 pm

Jubbly

Member Since: 20 Nov 2016
Location: Stourbridge
Posts: 401

Thats pretty much what i find too, my tomtom shows im doing 4-5 mph less than speedo, no mater what tyres i have on. Jaguar I-Pace HSE imminent.
Gone HSE with Flappy Paddles. IID BT tool. RLD Spare Protector, Altox GPS.

12th Sep 2018 1:58 pm

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