Ooops Posted December 9, 2009 Share Posted December 9, 2009 I'm thinking about converting my 1987 110 v8 3.5 manual to a 3.9 efi auto taken from a Discovery. I've searched the forum including the Tech Archives but I can't find anything specific to this conversion. Any and all help gratefully received Quote Link to comment Share on other sites More sharing options...
Aggrov8 Posted December 9, 2009 Share Posted December 9, 2009 hi, ive done this conversion twice and its very easy, everything bolts in. email me on garysarienne@worldonline.co.za or skype me on the same address, i'll help you out. Quote Link to comment Share on other sites More sharing options...
iomlt Posted December 9, 2009 Share Posted December 9, 2009 I carnt see this being easy. if i read correct the 3.5 (will be carb?) and the 3.9 (is a efi). I believe the wiring harness for the efi unit is all part of the discovery vehicle harness? If it was a 3.9 out of a range rover classic then yes its a easy conversion to do ( i have just done it myself) as the efi wiring is seperate to the vehicle so can be transfered. my advice is to either get a RRC wiring harness and attach it to the disco engine or as many people on here will say meggasquirt it. Or you could carb it and get rid of the efi side, which in my eyes is a shame al Quote Link to comment Share on other sites More sharing options...
patch1 Posted December 9, 2009 Share Posted December 9, 2009 Ive taken V8i engines out of discos in the past and all of them have been seperate looms so far. Quote Link to comment Share on other sites More sharing options...
iomlt Posted December 9, 2009 Share Posted December 9, 2009 my god! you learn something new everyday! what a great forum this is... Quote Link to comment Share on other sites More sharing options...
Ooops Posted December 10, 2009 Author Share Posted December 10, 2009 my god! you learn something new everyday! what a great forum this is... I'm not too sure if its true or not but I heard the Disco 1 has a separate loom and the Disco 2 has it integrated. Any how my proposed donor is a Disco 1 with 65k kilometres Quote Link to comment Share on other sites More sharing options...
mickeyw Posted December 10, 2009 Share Posted December 10, 2009 Ive taken V8i engines out of discos in the past and all of them have been seperate looms so far. Same here. Main difference with the loom is the Disco one is shorter, as the ECU is in the footwell. RRC loom is under the driver's seat. Quote Link to comment Share on other sites More sharing options...
berti1554 Posted December 10, 2009 Share Posted December 10, 2009 hi, ive done this conversion twice and its very easy, everything bolts in. email me on garysarienne@worldonline.co.za or skype me on the same address, i'll help you out. Not sure if this is as easy as you say. On my defender I had to install new mounts for the AT and engine (there should be a thread somewhere in this forum) as the AT has a different length compared to the manual box. The only mount I could use was the one of the transfer box (note: defender was a 200tdi with LT77 manual box). For the wiring harness: Doesn't matter if using MegaSquirt or not - build your own. Then you can be sure to have it a the correct length (the one out of the rrc is long enough to fit the ecu e.g. under the cubby box but I'm not sure about the one out of the disco) and new wires. Old engine looms may have problems with wire breaks. Quote Link to comment Share on other sites More sharing options...
iomlt Posted December 11, 2009 Share Posted December 11, 2009 the RRC loom is long enough to mount on the bulkhead behind the seats. (mine was anyways) the guy doing the conversion, is 90 is currently a V8 so "shouldn't" have any issues in this conversion. in theory Quote Link to comment Share on other sites More sharing options...
berti1554 Posted December 11, 2009 Share Posted December 11, 2009 It's a 90 with 3.5 V8 but has manual shift. Question was if the auto box (assume it is a 4HP22) is the same length as the LT manual box as it is fitted in the 90V8. If not the engine mounts and the left transmission mount has to be adapted. edit: just saw it's a 110 and not a 90 but doesn't matter Quote Link to comment Share on other sites More sharing options...
Ooops Posted December 12, 2009 Author Share Posted December 12, 2009 Just to clarify the original was a 110/Defender with a 3.5V8 and manual transmision Thank you every one for sharing your thoughts and for the private emails. Its all been a great help and I hope to get started with it next week. Olly Quote Link to comment Share on other sites More sharing options...
Mark90 Posted December 12, 2009 Share Posted December 12, 2009 If it's a factory V8 with an LT85 box then the V8/ZF combo will slot straight in on the same mounting positions. Quote Link to comment Share on other sites More sharing options...
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