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  #1  
Old January 3rd, 2008, 12:52 PM
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Brad Harris
1994 d90 300tdi "Nola"
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speedometer question

so newby here with a newly purchased d90 (one you guys have talked about here before with a 300tdi that I think pendy did the install on). I'm already having a great time with timing that's gone off (looks like someone didn't tighten it down properly) and I blew a gbr heavy duty cv as well (lucky me).

Now after that long winded introduction here's my actual question: My speedometer is consistently showing the speed as +10 mph from the actual speed and while it may be nice to think that I'm going that fast I'd really like to be a little closer to reality. It does have an aftermarket alternator which I think is making the rpms read too high but would this effect the speedo too? How does the speedometer work on these LRs? Is there any way to fix this?
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  #2  
Old January 3rd, 2008, 01:15 PM
rmuller
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Ryan
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Hey Brad, welcome to the board!

Do you have bigger than stock tires? If so, that's what causing it..


post up some pics of your truck when you get a chance!
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  #3  
Old January 3rd, 2008, 01:45 PM
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J. Landers
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Speedo cable goes straight to the lt230 (center diff), if you have a analogy speedo there is a gear that drives it, you can change that gear and change your speedo to a more correct speed. Or you can install a digital programmable speedo that will do the same thing. Then you will need instead of a gear a electronic sending unit. This is how the new d90s are. VDO makes a great digital speedo.
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  #4  
Old January 3rd, 2008, 02:44 PM
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Brad Harris
1994 d90 300tdi "Nola"
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I am running larger than stock tires (33") and have a change in the gearing (4.11) but the larger than stock tires should cause a percentage change not a consistant 10mph change and it should be the other way? Maybe the 4.11 gearing is putting it off?

It sounds like putting in a programmable speedo might be the best bet. I'll do some web searching. I'll look into VDO any other vendor recommendations? How tough will this install be?

and as requested, a picture of my new toy (if I can get the upload to work right):
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  #5  
Old January 3rd, 2008, 03:07 PM
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jim pendleton
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egauges.com Glad to hear it still burning fuel.

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  #6  
Old January 3rd, 2008, 03:41 PM
rmuller
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Ryan
1966 S2a 88" | 2006 LR3
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Yeah, you're right, its the opposite with bigger tires, and that size shouldn't affect it much... On my disco2, stock tire size was 28, I have 33's on there now (and 4.11s).. when the speedometer shows 60, the gps shows ~68.
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  #7  
Old January 3rd, 2008, 04:02 PM
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its a defender thing, mine is out 10mph at any speed, thats when on the odd occasion its working
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  #8  
Old January 3rd, 2008, 05:57 PM
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Keith Kreutzer
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You've go to make sure it's warmed up or at night to have an accurate reading.....

Welcome aboard Brad!!
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  #9  
Old January 4th, 2008, 05:13 PM
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Chance
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Lookin' good Brad!
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