cosecon Posted August 11, 2011 Share Posted August 11, 2011 I have just about finished collecting all the bits and pieces required for my conversion for a Defender 90 from carb to EFI Hotwire. I have also acquired a speed transducer, dirty and muddy but checked it and is fully operational. Now starts the question part: Where should I mount this transducer? How? What about the cable wires? Can I use Range Rover ones or they have to be custom made to length? Any help more than welcome!!! Quote Link to comment Share on other sites More sharing options...
knacker Posted August 11, 2011 Share Posted August 11, 2011 We run a Disco 3.9 V8 in our 90 challenge truck with no transducer, we've never had any problems with out it on or off road. Jon Quote Link to comment Share on other sites More sharing options...
kiwi_110 Posted August 11, 2011 Share Posted August 11, 2011 My old 90 that I converted to Disco V8 and Auto was running Lucas 14CUX ECU and it used to stall whenever I stopped at intersections. After a few days of this I sort of suspected that the ECU needed to know if we were moving or not. So I restored the speed sensor connection to the ECU. This was tricky because the truck still used a mechanical speedo. I ended up drilling a hole through the back of the disco transducer and piggy-backed the old speedo cable on it. I built a square extension piece that passed from the cable right through the hall effect gubbins and picked up the speedo drive in the transfer case. After this mod, the truck was fine. In fact it was spectacular and remains my favourite truck even though it's just a memory now after some a-hole in a Pissant Safari rear-ended me into a oncoming car which wrote off all three vehicles... Sorry, didn't mean to turn this response in to a nostalgia-trip Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 12, 2011 Share Posted August 12, 2011 I believe there's a RR unit that fits in-line with the speedo cable. I'd just MegaSquirt it and have done though Quote Link to comment Share on other sites More sharing options...
tacr2man Posted August 12, 2011 Share Posted August 12, 2011 Is it the box type transducer that fits inline with the speedo cable? I have this type on my 110 which went from carb V8 to 3,9 efi . Mine sits up by the brake servo as this is where the cable joins on a 110 speedo . It is wired thru bulkhead to the loom for the ecu which sits in cubby box between front seats . HTSH Quote Link to comment Share on other sites More sharing options...
cosecon Posted August 12, 2011 Author Share Posted August 12, 2011 I believe there's a RR unit that fits in-line with the speedo cable. I'd just MegaSquirt it and have done though I will, but that is the next step... one step at a time... 1st step carb to efi Hotwire 2nd step LT85 to auto 3rd step MS..... Quote Link to comment Share on other sites More sharing options...
cosecon Posted August 12, 2011 Author Share Posted August 12, 2011 Is it the box type transducer that fits inline with the speedo cable? I have this type on my 110 which went from carb V8 to 3,9 efi . Mine sits up by the brake servo as this is where the cable joins on a 110 speedo . It is wired thru bulkhead to the loom for the ecu which sits in cubby box between front seats . HTSH Yes I have the box type transducer. Did you use Range Rover cables from transfer to transducer and from transducer to speedo? Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted August 12, 2011 Share Posted August 12, 2011 My hybrid had this issue. Its a issue more when on road, come down the rev range to say traqffic lights at red, slow from rpm to a zero MPH and the engine will hunt and most likley stall at tickover Reason is no Speed transducer, without this a vital imput to the ECU is missing. Its driven from the gearbox to speedo drive with the unit in between drive to the speedo from the gearbox is then passed to the Unit which has a green and yellow wire from memory and connects into the V8 engine loom For an off road truck not essential, but can be annoying without it As fridge says Megasquirt it and bin the lucarse nightmares Nige Quote Link to comment Share on other sites More sharing options...
lbr Posted March 7, 2015 Share Posted March 7, 2015 Hello i am also doing these project i am iterested in knowing the parts nunber for two split cables and the transducer although mine is a 110 pick-up. Thank you in advance Quote Link to comment Share on other sites More sharing options...
tacr2man Posted March 7, 2015 Share Posted March 7, 2015 Hello i am also doing these project i am iterested in knowing the parts nunber for two split cables and the transducer although mine is a 110 pick-up. Thank you in advance The box type transducer is AMR3386 this is link to one of the two cables http://www.ebay.co.uk/itm/LANDROVER-DISCOVERY-RANGE-ROVER-SPEEDO-CABLE-V8-EFI-/371274974734?pt=LH_DefaultDomain_3&hash=item5671b6860e this is link to other http://www.ebay.co.uk/itm/Upper-Speedo-Cable-Range-Rover-Classic-/271643163002?pt=LH_DefaultDomain_15&hash=item3f3f31b97a HTSH Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted March 7, 2015 Share Posted March 7, 2015 Is that second link the one that will fit the transducer and a defender speedo??... if so. I don't suppose you know the patt no... as I don't want to get it from oz..... Thanks. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted March 7, 2015 Share Posted March 7, 2015 IIRC as you have jogged my memory , (it was about 20yrs ago !) I was in Australia when i did the 3.9 conversion , and think i used the bottom cable to transducer, but had to get a short cable made up for the speedo to transducer, as the rangy top one wasnt compatible . In UK these people should be able to help , I used them even further back for another conversion . http://www.speedograph-richfield.com/index.html HTSH Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted March 8, 2015 Share Posted March 8, 2015 When I converted mine to EFI, I used the short RR cable which goes from the transfer box to the transducer and then a speedo cable from an NAS 90/110 which connects straight from the transducer direct to the speedo. Cables are the right length. Got my cables from the main dealer with no issues despite being for NAS. They were abit pricy from memory but saved so much faffing about!! Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted March 8, 2015 Share Posted March 8, 2015 When I converted mine to EFI, I used the short RR cable which goes from the transfer box to the transducer and then a speedo cable from an NAS 90/110 which connects straight from the transducer direct to the speedo. Cables are the right length. Got my cables from the main dealer with no issues despite being for NAS. They were abit pricy from memory but saved so much faffing about!! Quote Link to comment Share on other sites More sharing options...
tacr2man Posted March 8, 2015 Share Posted March 8, 2015 there must be an echo in here Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted March 8, 2015 Share Posted March 8, 2015 Ple521...... $159....ouch..... Quote Link to comment Share on other sites More sharing options...
DavidW Posted March 8, 2015 Share Posted March 8, 2015 I'm assembling parts to build up 3.9 efi defender and have decided to move to a td5 binnacle and transducer. The td5 clocks have a pulse output which should drive the ECU. Quote Link to comment Share on other sites More sharing options...
Landrovernuts Posted March 9, 2015 Share Posted March 9, 2015 Did not mean to be an echo - because I was on the iPhone! Quote Link to comment Share on other sites More sharing options...
Patch_1 Posted June 2, 2016 Share Posted June 2, 2016 Hi all, I'm doing the same thing, infact I've been working on my V8i D90 for years and been collecting parts since I started 10years ago. For a long time now I've had a rectangular block speed transducer and its btacket tht fit down by the gearbox, the sort cable that goes between that and the box and the long one that goes betwwn that and the speedo head. Believe it came off a rangi but was an ebay buy if I remember right. Now that I'm at the stage of fitting it I've found that even though it fits the speedo drive of mw LT230 (also from a rangrover) it does not drive and turns out wont fit my speedo anyway. On investigation I've found that the cable and also the tranducer have a 2.5mm square drive end yet the gearbox drive and the defender cable I also got have 3mm square drives. Has anyone else come across this and are the parts spoken about above (The box type transducer is AMR3386) correct? any help welcome Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted June 2, 2016 Share Posted June 2, 2016 I recently had an interior for the short cable made with the bigger sq drive so my Speedo reads right. Under £20..... Quote Link to comment Share on other sites More sharing options...
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