Member Since: 10 Mar 2012
Location: Johannesburg
Posts: 205
D4 + Compomotives + BFG 265/65R18 and Speedometer
Hi Guys,
I have ordered Compomotives for my Disco, have also ordered BF Goodrich AT 265/65R18 K02s and I am wondering what effect this will have on the speedometer reading?
I have also ordere an IIDtool Bluetooth version so is there a fix if required?Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
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7th Nov 2017 3:06 pm
Naks
Member Since: 12 Jul 2010
Location: Stellenbosch, Republic of the Western Cape
Posts: 756
I didn't change anything on mine when I put the Compos on, was too lazy to --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged
Member Since: 24 May 2012
Location: North Yorkshire
Posts: 1235
In the unlikely event that your speedo is accurate now, you'll be going 2% faster than the indicated speed when you have the new tyres on.
However, your speedo probably under reads anyway, so it will probably be less inaccurate with the new tyres than it is now.MY2022 D5 HSE D300 - with extra nice bits added
MY2019 D5 HSE 3.0 SDV6 - sold to a dealer for a crazy price! - So good I bought another!
MY2012 D4 HSE 3.0 SDV6 - retired to a new home
7th Nov 2017 5:44 pm
spikekellyrm
Member Since: 23 Jul 2015
Location: Manchester
Posts: 662
I've stuck a little quick reference guide on the vanity mirror flap, I'll take a photo of it when I next get in the carD4.5 Facelift, Lazer ST4, Prospeed underbody and rack, IID BT, Compomotive/BFG KO2, Series MFlaps, RAI, Dog Gd+XBB, Alive Tuned, T-Max/YellowTop, RemoteFBH, GlassesMod, WheelWinchMod, Jack Mod, LED Mods, Seized Crank Mod....
7th Nov 2017 9:20 pm
HarryO
Member Since: 06 Apr 2010
Location: Brisbane Australia š¦šŗ
Posts: 79
Have just put on the exactly the same setup and put up a similar post.
Theoretically your speedo should under read by 5.3% so your actually going faster than you think. Eg Speedo = 110km/h actual speed 115.9 km/h). Not sure is this falls within the speedo accuracy tolerance but in my case my speedo under reads and my 2 speeding fines are evidenceš.
Some threads say you can easily adjust the wheel size with your IID tool - others say that it is not recommended because itās a āCritical parameter that is part of the CCF health-check.ā
Hope someone in the know can give a definitive answer..
Cheers..Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - itās a built in anti-rust feature
Discovery 4 TDV6
Discovery 4 TDV6 (Stolen)
Discovery 3 SE (Sold)
Discovery 2 (Sold)
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28th Jul 2018 11:19 pm
indy4x
Member Since: 24 Nov 2017
Location: Pontypool
Posts: 193
Had notice the option in the IID menus to change the wheel size, not that I need to yet
Have been checking my D3 against the roadside speed warning signs and the speedo seems pretty accurate
29th Jul 2018 12:00 am
gseum
Member Since: 15 Feb 2010
Location: Germany
Posts: 165
Here are the infos for changing speedo on D4:
https://www.gap-diagnostic.com/faq-items/a...tire-tyre/Discovery 4/LR4 HSE 5.0 V8 MY2010 // Volvo XC60 II T8 Inscription Fusion Red MY2020 // Hyundai Kona Electric Trend MY2020 // BĆ¼rstner TravelVan 620G MY2020
1st Nov 2018 8:50 pm
Ent
Member Since: 12 Oct 2007
Location: In the cack
Posts: 6485
I have the same wheel/tyre combo and my speedo is bang on without and tweekinhClub Exped trailer
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2nd Nov 2018 1:12 am
HarryO
Member Since: 06 Apr 2010
Location: Brisbane Australia š¦šŗ
Posts: 79
In the end I checked my speedo against a phone app, Navman and my wifeās car and agree - speedo is bang on with no changes to anything. No excuse for the fines anymore š«
Canāt argue with the maths so it make me wonder about the default speedo setting accuracy out of the factory - if that is 5% out then everything calculated from the speedo is 5% out (eg L/100 km)
.Land Rovers never get bogged! - merely delayed
Land Rovers never break down! - merely fail to proceed.
Land Rovers never leak oil - itās 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)
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