I really don’t know much about your build, I do know about my build. A part of having my vehicle done properly was having the speedo corrected so that it complied and then having it all engineer certified. I can almost guarantee there are no D2’s on this forum that have had a speedo correction unit longer than mine, and mine has been 100% reliable. I actually don’t think they make anything fail. Valuing making it comply and actually making it comply are totally different things. If its done properly, it will comply.
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
Not sure how your speedo can be out that much on 245/70/16, I'm running 235/85/16 which puts mine out by about that much. The standard tyre size is 235/70/16 which is 29" and from the information I have gathered a 245/70/16 is only 29.5" an increase of only 1.7%.
235/70/16 (29") to a 235/85/16 (31.7") is an increase of 9.3%, my speed isn't over quite that much but it is close. So at 100 Km/h your speed should only be over by < 2 Km/h.
Please someone correct me if I'm wrong.
There is no eraser on the pencil of life.
Now - 2008 D3 SE 4.0l V6
Was - 2000 D2 TD5 with much fruit.
Ray
Interesting point!
Brother is running 245/75 16's and is out by 6k/h(doing 106 at an indicated 100)
Of course some variation in tyre design/manufacture will change that from car to car, and I guess add some inherent speedo differences too.
as an example:
I used to have 255/70s and changed to 245/75 just recently myself.
Theoretically, the 245/75 are about 1% larger, so will slow speedo down by that 1% or so(maybe 1.3 or whatever the calculator said.
So, I expected this on my test run.
But, my speedo went the other way .. went an indicated -1%(roughly), instead of +1% actual speed.
So instead of seeing a 0% difference or maybe 1% difference, .. ie. either 100 or 101 at an indicated 100, I now get 97-ish, where I used to get about 98 at in indicated 100.
Unless there was a monumental issue with the GPS system on that day a few days ago, both GPSes showed the same speed.
But you're right .. 245/70 .. shouldn't alter speedo by that much.
.. maybe Trout's D2 had a speedo corrector installed by some previous owner
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
Your brother's car is about right, the variation from standard (29") to 245/75/16 (30.5") is 5.2% so 6 Km/h above indicated works. As you say variations in tyres.
I have no idea what's going on with yours though. That's just weird, even with the 255/70/16 you should have been getting about 104 at an indicated 100. And then a further increase of a little over 1% with the 245/75/16, so should be doing about 105-6 Km/h at an indicated 100.
My brain hurts.
There is no eraser on the pencil of life.
Now - 2008 D3 SE 4.0l V6
Was - 2000 D2 TD5 with much fruit.
Ray
LOL! I can add to the strangeness, but I'll leave it at that for now .. don't want to cause you any more pain!
I'm guessing: std from factory, they probably had a +5k/h error built into the speedo, which is what I usually see from most vehicles I drive/have driven.
So lets say LR had tried to achieve a +5k/h error from new.
Add the variation of the 255/70's correction amount, that would bring the speedo closer to actual. So that'd take my 255/70's to about 99-ish .. which is what I generally saw.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
The original tyres when i bought the D2a were crappy little road tyres and the speedo was pretty much correct.
I have had a set of Yokohama Geolanders on since then and i got 60k out of them without any dramas an i now have a set of MT ATZ P3's on and they both give me the same speedo reading so the car May have a speedo "gizmo" fitted.
You only get one shot at life, Aim well
2004 D2 "S" V8 auto, with a few Mods gone
2007 79 Series Landcruiser V8 Ute, With a few Mods.
4.6m Quintrex boat
20' Jayco Expanda caravan gone
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