Off Road Toad Posted March 13, 2012 Share Posted March 13, 2012 After completing the conversion to Td5 in my 90 one of the last things to do was fit the speed transducer so I could see how fast I am going. I bought a new one (non genuine) and am having issues with it over reading massively. It's over reading by double ie at 35 mph it's telling I'm doing 70mph. Currently I have disco T/box 1.2 with 285/75 r16 tyres and 3.8 ratio diffs. By my reckoning it's a few percent over a standard disco in terms of final drive. It has the disco drive gear for the sender so why the huge innaccuracy? Could it be the Chinese transducer is wrong or a speedo fault ? Steve Quote Link to comment Share on other sites More sharing options...
fozsug Posted March 13, 2012 Share Posted March 13, 2012 I think i have a genuine AMR1253 somewhere that you can have to see if its the chinese having a laugh, will ahve a look later if you want. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted March 13, 2012 Share Posted March 13, 2012 There is one transducer type that does over read by double, if you have a look at all the threads of people that have done the conversion to TD5 speedo on their defenders you'll see this happening a lot. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted March 13, 2012 Share Posted March 13, 2012 According to James (retroanaconda) you need this one http://www.lrseries.com/shop/product/listing/13485/YBE100530-TRANSDUCER-SPEEDO-DRIVE.html Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 13, 2012 Share Posted March 13, 2012 I'd read about one of the cheap ones over reading before. I've got a genuine defender one in mine and it reads great. Was about £26 IIRC Quote Link to comment Share on other sites More sharing options...
Gaz13 Posted March 13, 2012 Share Posted March 13, 2012 Had the same problem, bought mine from LRdirect, they sent a black unit in a Britpart box which overread. They exchanged this for a Almakes which was green with VDO marked on the side, this worked as it should. Quote Link to comment Share on other sites More sharing options...
crclifford Posted March 13, 2012 Share Posted March 13, 2012 I can confirm that the britpart one overreads by double!!! and when i spoke to britcar, my supplier, they said they had had a few do this...so after returning it to them they supplied a genuine one and it reads fine. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted March 13, 2012 Share Posted March 13, 2012 Britpart ! Quote Link to comment Share on other sites More sharing options...
Off Road Toad Posted March 14, 2012 Author Share Posted March 14, 2012 I'm ashamed to say (and I really should know better) that the one I bought was in fact one level worse than Britpart! I got a county one from premiere supply. I'll just get a genuine one and have a discussion with premiere about their quality and refunds. Thanks all for the advise and I'll report back when I've fixed it. Steve Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted March 14, 2012 Share Posted March 14, 2012 Well, at least we know that Britpart and County get them from the same place! Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted March 14, 2012 Share Posted March 14, 2012 For what it's worth, the Disco transducer unit (the small black one, think it has an AMR part number) reads double the number of pulses that the Defender Td5 one (YBE100530) does. For a Defender Td5 speedo, YBE100530 is what you want. Anything else will mis-read, and a non-genuine YBE100530 will double-read. Never heard of a Britpart YBE100530 not reading double! Quote Link to comment Share on other sites More sharing options...
Davewillb Posted August 8, 2013 Share Posted August 8, 2013 Had the same problem, bought mine from LRdirect, they sent a black unit in a Britpart box which overread. They exchanged this for a Almakes which was green with VDO marked on the side, this worked as it should. I just had the same problem with the Britpart version of the YBE100530 - the Allmakes (mine was marked VDO as well) worked fine when it turned up as a replacement - I just want a credit on the Britpart version now. Dave Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted August 8, 2013 Share Posted August 8, 2013 It amazes me that they still haven't sorted this problem, surely BritPart must have worked out by now that they don't work? Quote Link to comment Share on other sites More sharing options...
Davewillb Posted August 8, 2013 Share Posted August 8, 2013 its poor isn't it - I guess they may have muddled up the spec and made them for a Disco with the higher pulse count. I bought mine from LRDirect and I've sent them a link to all the forum comment. Mine was a shoddy build quality as well with the metal section loose on the plastic molding. Just so this is linked to this forum, I did try the AMR 1253 from the original Disco gearbox, this need different wiring, two wires, one is an earth and the other is the signal out t0 the Defender TD5 speedo, this combination also reads double. I started playing with a CMOS divider chip (4027 I think) and this worked briefly but then stopped, I think the signal from the AMR 1253 is too messy probably, but then I managed to blow it and didn't have another to hand so abandoned it in disgust - I'll try it again though when I've got a bit more time as it would be quite neat.... it might even be a way of correcting for tyre size variation etc with a more sophisticated divider chip?? Dave Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted August 8, 2013 Share Posted August 8, 2013 If you are into electronics you can reprogram the eeprom in the speedo head, that will allow you to change the pulse per mile count so you can compensate for tyre size and double speed senders if you like. The link in my signature details the time a few of us on the forum dismantled the speedo head and tried to work out what the eeprom contents meant. Quote Link to comment Share on other sites More sharing options...
Davewillb Posted August 8, 2013 Share Posted August 8, 2013 I'm not that good with eeproms I'm afraid, wish I was - I read that thread on the forum a couple of days ago and admired what went in to it but I'm just a dabbler in electronics and don't have access to that kit. I do think that fiddling with the signal going into the speedo is an option though and I've got a spare speedo to play with at the mo. If I get anywhere with it I'll let people know but it could be an autumn project. Dave Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted August 8, 2013 Share Posted August 8, 2013 I must get around to finding a cheap programmer for them. There is merit in playing with the signal to the speedo, for a start it saves opening the speedo up. Quote Link to comment Share on other sites More sharing options...
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