Landrovernuts Posted April 26, 2013 Share Posted April 26, 2013 Hi all, I know that LR speedos are not known for their accuracy, however was going down to Cornwall earlier and my 3 year old son wanted the television screen with the roads on (satnav) started so he could see the roads changing colour. What I was more concerned about (as I knew the way!) was how far my speedo was out by the satnav. At an indicated 70mph, I was only doing a satnav indicated 60mph. I know there are different pinions for the speedo drive in the transfer box and know that I have the blue one fitted as I have 235/85 tyres fitted. Whats the options on other colour pinions to gain some accuracy back - I am not expecting it to be perfect, but slightly better would be nice! Toby Quote Link to comment Share on other sites More sharing options...
western Posted April 26, 2013 Share Posted April 26, 2013 the blue 20tooth version FRC3310, standard fit on all 110 running 7.50 tyres & suitable for 235/85 or 255/85 tyres, even if you have the Discovery 1.22 transferbox the Blue gear is still the one to use with the tyres mentioned Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted April 26, 2013 Share Posted April 26, 2013 Isn't that the blue one Ralph? ie the one already fitted ..... if so that would indicate something else is afoot .... Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted April 26, 2013 Share Posted April 26, 2013 What brand of tyres? Some remoulds for example are far bigger than the nominal size they are sold by. Quote Link to comment Share on other sites More sharing options...
western Posted April 26, 2013 Share Posted April 26, 2013 I know he has the blue which is correct for the tyre size fitted, I've had 7.50's & 235's on my 110 without any speedo indication problems, the only other bit is the gear the speedo drive is driven by, on the shaft it could be down to the tyre diameter as Retro suggests. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted April 26, 2013 Share Posted April 26, 2013 Appologies Ralph I must have been half asleep when I replied earlier. As you say the blue gives an accurate reading with the 235's (it does for me). Is there a chance the speedo itself is at fault? Quote Link to comment Share on other sites More sharing options...
western Posted April 26, 2013 Share Posted April 26, 2013 possible it might be a failing speedo, only way to know is to swap it for a known good one or a new one. Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted April 27, 2013 Author Share Posted April 27, 2013 Hi thanks for the replies. The tyres are all Goodyear MTR, about half worn evenly all round. The transfer box is a discovery 1.22 and the speedo is the original and most steady reading land rover speedo I have had (other than it reading wrong!) I used to remember the various pinions, but have forgotton, just wondered if changinging back to the normal 205/16 one would give a better reading. I might have to get my calculator out!!! Toby Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted April 27, 2013 Author Share Posted April 27, 2013 I forgot to mention that I have the NAS type speedo cable fitted (two sections) so the road speed transducer for the EFI can be fitted. I would have thought that this was driven straight through and not reduced giving a slower cable speed. I may have to check that! Toby Quote Link to comment Share on other sites More sharing options...
tacr2man Posted April 27, 2013 Share Posted April 27, 2013 I forgot to mention that I have the NAS type speedo cable fitted (two sections) so the road speed transducer for the EFI can be fitted. I would have thought that this was driven straight through and not reduced giving a slower cable speed. I may have to check that!Toby Yes its just a straight thru pulse generator I had same on my 110 for going efi Quote Link to comment Share on other sites More sharing options...
western Posted April 27, 2013 Share Posted April 27, 2013 list of speedo drive gears http://forums.lr4x4.com/index.php?showtopic=2025&hl= Quote Link to comment Share on other sites More sharing options...
miketomcat Posted April 27, 2013 Share Posted April 27, 2013 Your tbox is set up for smaller tyres yes the pinion may be the same but I suspect the worm gear it runs on may not be. My 110 should have the blue gear but it's not accurate with standard tyres however it is with 33's. Mike Quote Link to comment Share on other sites More sharing options...
western Posted April 27, 2013 Share Posted April 27, 2013 same gear FRC3162 in LT230 according to this http://www.lrseries.com/shop/product/listing/6375/FRC3162-SPEEDO-WORM-GEAR.html Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted April 28, 2013 Author Share Posted April 28, 2013 Just looked at the different pinion colours. I know what the red and blue are for, what about the green and yellow? Just debabting whether to try the green gear or not as changing the speedo gives the same error! Toby Quote Link to comment Share on other sites More sharing options...
western Posted April 28, 2013 Share Posted April 28, 2013 AFAIK the 21 tooth green is used as standard fit in all 90's I've updated the link too. Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted April 28, 2013 Author Share Posted April 28, 2013 Thanks Western - I may have to see if I can find a green one and try it, if not just live with the error! Toby Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.