correcting mph reading ... - Land Rovers Only

natvboy · 01-10-2007, 05:14 PM

well I know when I lifted my TJ I corrected my speedometer with no speedo gears. How do I correct this issue with my DI? Is this done by computer or is there a gear that needs to be changed and is it even possible?

Thanks

p76rangie · 01-10-2007, 06:22 PM

You can get electronic speedo correction devices. Some actually have a switch on them so you can run road and off road tyres of different sizes and keep the speedo correct. Just do a search on the net.

Thor · 01-10-2007, 07:54 PM

Verify the spedo is wrong first.

With my 1995 classic it read atleast 10% low. After my lift and changing from 205/80 29" to 235/85 32" my speedo was dead on!!! So the conspiracy side of me says... wow my warranty ended 10% early mileage wise.

Plus as a Firefighter/EMT don't you have a get out of jail free card!

jhmover · 01-10-2007, 08:19 PM

That works both ways. My D2 speedo was right on, when I put bigger tires on it slowed it 10% so I got extra warranty miles....heheh.

Thor · 01-10-2007, 09:40 PM

Quote:

Originally Posted by jhmover

That works both ways. My D2 speedo was right on, when I put bigger tires on it slowed it 10% so I got extra warranty miles....heheh.

Merry Christmas... enjoy my 10%..hahaha

It's o.k. nothing big happened between 50k and 55k.

p76rangie · 01-10-2007, 09:45 PM

How did you check that your speedo was wrong?

natvboy · 01-11-2007, 05:07 AM

I haven't yet. Don't even have bigger tires yet but figured it would be an issue once I did.

Thanks guys

p76rangie · 01-11-2007, 05:19 AM

Natv, my question was more directed at Thor.

Thor · 01-11-2007, 05:26 AM

Quote:

Originally Posted by p76rangie

How did you check that your speedo was wrong?

I lived in Albuquerque at the time, where my good friend from college was a sheriff's deputy so he clocked me. I had him do this because near the Albuquerque international airport a trailer with a radar gun and a speed display was set up to show you how fast you were going compared to the speed limit sign next to it, and that seemed to read a bit low for my RR.

After the tire change, which happened in Colorado, I happened upon another trailer and it was dead on.

By the way natyboy, your Disco I has more similar to the 1995 Range Rover than the Disco II.

antichrist · 01-11-2007, 06:08 AM

My D1 reads almost right with 7.50x16's according to my GPS.

rmuller · 01-11-2007, 09:19 AM

My D2 is off... 32" tires.. if the speedo says i'm going 60, i'm really going 65... I measured with GPS.

300bhp/ton · 01-12-2007, 03:43 AM

GPS is an easy way to check.

Also A D1 should be a mechanical speedo so depending on what's done swapping the speedo drive gear should get you closer to accurate.

Either that or just don't worry about it.

My speedo reads way low, at an indicated 22mph it is actually going over 30mph, sure it only gets worse as speed increases.

siam · 01-19-2007, 03:22 PM

Disco 1 went to a 265/85/16 a whole lot taller than stock but when I guage it with those speed signs with the speedo clock on it 30 on my speedo is dead on 30mph on the sign...

01-10-2007, 05:14 PM	#1 (permalink)
natvboy Senior Member Join Date: Feb 2006 Location: Rapid City, SD Posts: 170 Gallery: 0	correcting mph reading ... well I know when I lifted my TJ I corrected my speedometer with no speedo gears. How do I correct this issue with my DI? Is this done by computer or is there a gear that needs to be changed and is it even possible? Thanks __________________ "He who has a 'why' to live, can bear with almost any 'how'." - Friedrich Nietzsche (1844-1900)

01-10-2007, 07:54 PM	#3 (permalink)
Thor Solihull Society, CO and High Desert Rovers, NM Member Join Date: Nov 2006 Location: Colorado Posts: 1,224 Gallery: 0	Verify the spedo is wrong first. With my 1995 classic it read atleast 10% low. After my lift and changing from 205/80 29" to 235/85 32" my speedo was dead on!!! So the conspiracy side of me says... wow my warranty ended 10% early mileage wise. Plus as a Firefighter/EMT don't you have a get out of jail free card! __________________ Todd Carpe Rangius Roverum

01-11-2007, 05:07 AM	#7 (permalink)
natvboy Senior Member Join Date: Feb 2006 Location: Rapid City, SD Posts: 170 Gallery: 0	I haven't yet. Don't even have bigger tires yet but figured it would be an issue once I did. Thanks guys __________________ "He who has a 'why' to live, can bear with almost any 'how'." - Friedrich Nietzsche (1844-1900)

01-11-2007, 06:08 AM	#10 (permalink)
antichrist Senior Member Join Date: Aug 2004 Location: near Altanta Posts: 524 Gallery: 0	My D1 reads almost right with 7.50x16's according to my GPS. __________________ Tom Rowe Atlanta, GA Four wheel drive allows you to get stuck in places even more inaccessible. 62 88 reg 67 NADA x2 74 Air Portable - The Antichrist (tag 6A666) 95 D1 - R380 95 D90 - R380

01-11-2007, 09:19 AM	#11 (permalink)
rmuller Moderator Join Date: Feb 2005 Location: Northern NJ Posts: 2,399 Gallery: 0	My D2 is off... 32" tires.. if the speedo says i'm going 60, i'm really going 65... I measured with GPS. __________________ Ryan :: Off-Road/Accessories Moderator :: Gallery 2001 Discovery II \| 1994 Defender 90 #416

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01-10-2007, 06:22 PM	#2 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 2,071 Gallery: 0	You can get electronic speedo correction devices. Some actually have a switch on them so you can run road and off road tyres of different sizes and keep the speedo correct. Just do a search on the net.

01-10-2007, 08:19 PM	#4 (permalink)
jhmover Senior Member Join Date: Aug 2005 Posts: 310 Gallery: 0	That works both ways. My D2 speedo was right on, when I put bigger tires on it slowed it 10% so I got extra warranty miles....heheh.

01-10-2007, 09:45 PM	#6 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 2,071 Gallery: 0	How did you check that your speedo was wrong?

01-11-2007, 05:19 AM	#8 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 2,071 Gallery: 0	Natv, my question was more directed at Thor.

01-12-2007, 03:43 AM	#12 (permalink)
300bhp/ton The Best 4X4XFar Join Date: Mar 2005 Location: England, home of the Land Rover Posts: 598 Gallery: 0	GPS is an easy way to check. Also A D1 should be a mechanical speedo so depending on what's done swapping the speedo drive gear should get you closer to accurate. Either that or just don't worry about it. My speedo reads way low, at an indicated 22mph it is actually going over 30mph, sure it only gets worse as speed increases. __________________ Land Rover Discovery (3 Door) 200Tdi 5-speed Mods:Allisport LARGE FMIC \| Allisport Tuned \| Simex Jungle Trekker II 33.11.50R15 Tyres \| 15x8 8 Spokes \| Heavy Duty Uprated Suspension (shocks & springs) \| Wheel arch Flares \| 1" Wheel Spacers \| Custom Straight Thru Exhaust \| Custom Trimmed Front bumper with twin NATO Hooks \| Custom Rear Bumper with single Large NATO Hook 360˚ Swival \| Front Light Guards \| Custom Aluminium Rear Floor \| Bonnet Straps \| 100w Spot Lights \| Upgraded Headlights The Best 4X4XFar

01-19-2007, 03:22 PM	#13 (permalink)
siam 100 quids for a days work son.. Join Date: Aug 2004 Location: Alameda Island Posts: 238 Gallery: 0	Disco 1 went to a 265/85/16 a whole lot taller than stock but when I guage it with those speed signs with the speedo clock on it 30 on my speedo is dead on 30mph on the sign... __________________ SupermotoUSA 917 www.DiceRacing.com RRC beast sold Disco 95 5 on the floor

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