minimaquinas Posted June 13, 2015 Share Posted June 13, 2015 Hi whats the benefits of swapping my 300 tdi 110 r380 transfer box for a disco r380 transfer box and will I loose the towing power tia Quote Link to comment Share on other sites More sharing options...
davie Posted June 13, 2015 Share Posted June 13, 2015 not too sure on 300 but on my td5 defender it was revving like mad at 60 before i fitted disco box. Depends on what towing you do, amount of hills etc Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted June 13, 2015 Author Share Posted June 13, 2015 I live 10 kms and 800meters up a mountain in sunny spain and tow a 2.5 ton trailer regularly What difference did it make on fuel consumption and speed Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 14, 2015 Share Posted June 14, 2015 You just use different gears..... It does not change the power output. You only need to be worried about hill starts when loaded. If you are okay with low box starts on a steep hill then it is fine. Consumption can be better if you don't drive faster. It let's you go faster. Quote Link to comment Share on other sites More sharing options...
Maverik Posted June 14, 2015 Share Posted June 14, 2015 I thought long and hard about this and decided on the overdrive route, I didn't want to compromise on the towing ability of the truck... There are plenty of accounts of the pro's and con's of this if you stick it into Google. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted June 14, 2015 Share Posted June 14, 2015 It works for some, and not for others. Vulcanbomber had a 1.2 in for a week....it would have been back out sooner but he was at work and didn't have time to take it out again. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted June 14, 2015 Share Posted June 14, 2015 I have a discovery tgb in my 90 which is a 300tdi edis (slightly higher power ) running on 265/75r16 BFG MT it is an auto , so the higher gearing doesn't detract from ability to pull away from stop (due to torque converter) . Its best use is on dual carriageways or motorways allowing a low rpm relaxed feeling cruise , also the auto part is very good in town. It is not at its best in hills or when towing ,some of this is due to change points on the auto , but the main thing is down to its 1.2 is overgeared , I am somewhat torn between leaving as is due what i do mostly with it, and fitting a 1.4 (which i have sat in garage) . If i didn't have my 110 to do the heavy towing i would have probably changed it .JMHO Quote Link to comment Share on other sites More sharing options...
Trailbear Posted June 14, 2015 Share Posted June 14, 2015 when i first purchased my 300 ti Defender, I put in a 1.2 ratio transfer box as I mistakenly thought that it would improve the vehicles cruising ability. I found that to be the case when going down hill, very pleasant! A completely different story when approaching anything larger than a speed bump, it was horrendous, never away from changing down the box, struggling to gain momentum. On the few occasions that I tried towing, 3rd gear was the most I could ever manage! My vehicle has an Allisport larger intercooler, modified pump and a variable vane turbo. I took it out and replaced it with the standard gearing. An overdrive is on the cards when funds allow. I know that it is personal choice but I would recommend steering well clear of this option, especially where hills and towing is involved. This conversion is fine for Td5 engines as they have lots more power available, not to mention tuning suitability. Just my own opinion of course Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted June 14, 2015 Share Posted June 14, 2015 If you tow, I wouldn't use a 1.2 box Quote Link to comment Share on other sites More sharing options...
Arjan Posted June 14, 2015 Share Posted June 14, 2015 I have a 110 Hard Top with the 300 Tdi + R300 + Disco box and not happy with it. To tall for my liking. Looking for a 1.44 : 1 Quote Link to comment Share on other sites More sharing options...
steve b Posted June 14, 2015 Share Posted June 14, 2015 If you are not doing lots of travelling on main roads in 5th you will probably not see the benefit , only the negative of more use of the gearbox , more so when towing 2.5t trailers . Having said that , I have been running a 1.2 TB for 11 years now in my 109sw which weighs 2.5t (cage , hyd winch long range tanks etc) including towing 3.5t trailer and have got on really well with it , it seems to suit my driving style and expectations . On a trip to the Charente in France towing a fully loaded Ifor 3.5t trailer it returned 28mpg over 700miles and on the way back solo it went up to 32mpg and another trip to Poland I averaged 33mpg over 2700miles - best ever ! Engine is a bog std 200tdi with either 255/85 -16 BFG MT's or 235/85-16 AT's cheers Steveb Quote Link to comment Share on other sites More sharing options...
Arjan Posted June 14, 2015 Share Posted June 14, 2015 "it seems to suit my driving style and expectations..." You have a point there. We also run a 90 with a 200 Tdi and I keep comparing those two and perhaps I should not do that. I'm in the Alps this Summer for a few weeks with clients and we'll see how it goes. I do have a 1.66 : 1 here but that is really short. But pulls very well. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted June 14, 2015 Share Posted June 14, 2015 If you are not doing lots of travelling on main roads in 5th you will probably not see the benefit , only the negative of more use of the gearbox , more so when towing 2.5t trailers . Having said that , I have been running a 1.2 TB for 11 years now in my 109sw which weighs 2.5t (cage , hyd winch long range tanks etc) including towing 3.5t trailer and have got on really well with it , it seems to suit my driving style and expectations . On a trip to the Charente in France towing a fully loaded Ifor 3.5t trailer it returned 28mpg over 700miles and on the way back solo it went up to 32mpg and another trip to Poland I averaged 33mpg over 2700miles - best ever ! Engine is a bog std 200tdi with either 255/85 -16 BFG MT's or 235/85-16 AT's cheers Steveb Is that on 4.7 diffs though Steve? Quote Link to comment Share on other sites More sharing options...
steve b Posted June 14, 2015 Share Posted June 14, 2015 no , 3.54's and LT77/230 combo . As I said you lose a bit on low speed torque but gain with less noise at main road speeds . Interestingly in fifth 45 - 65 mph takes the engine from the peak torque rpm at 45/50 up to peak power rpm at 65/70 so it should be optimum set up .........of course it's still only 110 bhp , so in my case at 45bhp/tonne it's never going to damage the tarmac cheers Steveb Quote Link to comment Share on other sites More sharing options...
ejparrott Posted June 14, 2015 Share Posted June 14, 2015 90's take it much better than a 110, being that much lighter to start with Quote Link to comment Share on other sites More sharing options...
minimaquinas Posted June 14, 2015 Author Share Posted June 14, 2015 Well thanks for all the info guys taking everything into account I think I will be sticking with the original transfer box and putting my complete disco 300 r380 box up for sale so if anyone in spain needs 1 call me thanks again guys Quote Link to comment Share on other sites More sharing options...
dsj1979 Posted June 20, 2015 Share Posted June 20, 2015 I fitted one to my 200tdi 110 as I do a lot of motorway driving. It's quieter which was nice but... well painful up hills etc. I have recently tweaked the fuel pump and it's now a different vehicle. Lovely to drive, and I'm trying to sound proof it so the relaxed gearing is helpful. If you do lots of 50mph plus driving and give it a little tune up I would definitely recommend, otherwise stick as you are. Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted June 20, 2015 Share Posted June 20, 2015 I did it and changed back, it wasn't for me. I don't push along much more than 50 - 60 though and do a lot of back road / lane driving. on 205's it might have been ok but on 235/85 it was just to tall for me. Quote Link to comment Share on other sites More sharing options...
Anderzander Posted June 21, 2015 Share Posted June 21, 2015 It seems to be a common theme that it doesn't work out so well on the TDI's - but does on the Td5 Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted June 21, 2015 Share Posted June 21, 2015 I did it on my 200 tdi and changed back as soon as I could. It's great on the motorway but away from it is too tall a gearing. Around town 2nd and 3rd are in the wrong place and you end up constantly changing gears when you shouldn't need to. Just my experience. Mo Quote Link to comment Share on other sites More sharing options...
reb78 Posted June 21, 2015 Share Posted June 21, 2015 I did it on my 200 tdi and changed back as soon as I could. It's great on the motorway but away from it is too tall a gearing. Around town 2nd and 3rd are in the wrong place and you end up constantly changing gears when you shouldn't need to. Just my experience. Mo You should get an overdrive Mo. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted June 21, 2015 Share Posted June 21, 2015 Perhaps I should, Rich ? Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 22, 2015 Share Posted June 22, 2015 Turn up the power. I run a 1.2 on my Defender with 35s. Zero problems. Quote Link to comment Share on other sites More sharing options...
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