discojmz Posted December 27, 2007 Share Posted December 27, 2007 just a quick one. I assume both 200 and 300tdi discoverys use the LT230 transfer box (i know theyre slightly different) and i was under the impression both were 1.2:1 is the r380's output speed for a given engine speed higher than that of the LT77 then? because i borrowed my dad's 300tdi today and engine revs for any given speed are massively lower than my 200tdi or has some goon fitted a defender transfer gear in my transfer box when it was replaced because of wear about 17000miles ago cheers jim Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted December 27, 2007 Share Posted December 27, 2007 Look at the ratio sticker under the transfer box filler/level plug, it is not beyond it that the repair was on the cheap using a s/h def box. Quote Link to comment Share on other sites More sharing options...
discojmz Posted December 27, 2007 Author Share Posted December 27, 2007 17k ago it had a rebuilt back axle, new gearbox and new transfer gear. by transfer gear, im led to believe it was just the input gear. I suppose what would be handy to know is what revs peoples engines are at, 200 and 300 alike, for say 60mph in 5th gear or whatever jim Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted December 28, 2007 Share Posted December 28, 2007 Compare revs/speed in 4th as that is a direct gear in the main box as 5th might be slightly different in LT77 and R380. If in 4th the revs/speed are the same then the transfer ratios are the same. Just a thought are both vehicles running the same size tyres and got the correct speedo gear for the tyres? Quote Link to comment Share on other sites More sharing options...
discojmz Posted December 28, 2007 Author Share Posted December 28, 2007 both running 235/70R16, mine on goodyear wranglers, his on general grabbers it's something to the tune of his at 60mph in 5th is maybe just under 2000rpm and mine is well up probably above 2500 will try 4th and see as far as i know they have the right speedo gears, theyre both pretty accurate by sat nav Quote Link to comment Share on other sites More sharing options...
lynall Posted December 28, 2007 Share Posted December 28, 2007 Not sure on rest of gears but the 300 first gear is much higher than 200 first, as i used to chug away with a trailer quite happily in my old 200 then got a 300 and had to give the clutch some stick just to get going was a nightmare on a hill start with a trailer and a couple of passengers. Lynall Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted December 28, 2007 Share Posted December 28, 2007 As the main boxes are different on 200 & 300 that is why i suggested using 4th as they are both 1:1. Quote Link to comment Share on other sites More sharing options...
discojmz Posted January 8, 2008 Author Share Posted January 8, 2008 right, in 4th im at about 2000rpm at 30mph. sorry it's a rubbish figure, its just the only one i can remember from when i was out in it earlier jim Quote Link to comment Share on other sites More sharing options...
Comical Engineer Posted January 8, 2008 Share Posted January 8, 2008 right, in 4th im at about 2000rpm at 30mph. sorry it's a rubbish figure, its just the only one i can remember from when i was out in it earlierjim From memory, my 300tdi running 235 section muddies is only turning about 1500 rpm at 30mph in 4th. I can't hold 30 in 5th as the engine won't pull from that low (about 1200 rpm). I'll have another look tomorrow. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted January 9, 2008 Share Posted January 9, 2008 As the main boxes are different on 200 & 300 that is why i suggested using 4th as they are both 1:1. Not really.... Disco LT230s are all 1.2:1 Defenders are all 1.4:1 except: 2.5p and 2.8i BMW Defenders which are 1.6:1 (the first cos it has no go, the second cos it revs high) 1.0:1 boxes were used on some Range Rovers, not sure which ones. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted January 9, 2008 Share Posted January 9, 2008 My old 2.5P 90 had a 1.4:1 box... 2.5NAD 110s have a 1.6 box. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted January 9, 2008 Share Posted January 9, 2008 Makes sense - both are very rare here, although I have driven an ex-SA Army 2.5p but didn't check what transfer box it had. And I've never seen a 2.5 NAD here at all! Quite a few 2.5TDs as the Army bought them (before they discovered their mistake). The 2.8i 90 goes like a rocket! Though it is considered to be dangerously fast. There was a rumour that the insurance companies would blacklist them as so many were rolled. But it didn't happen, not so far anyway. And now they aren't made any more since Fraud took over. Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted January 9, 2008 Share Posted January 9, 2008 Not really....Disco LT230s are all 1.2:1 Defenders are all 1.4:1 except: 2.5p and 2.8i BMW Defenders which are 1.6:1 (the first cos it has no go, the second cos it revs high) 1.0:1 boxes were used on some Range Rovers, not sure which ones. Jim what are you smoking, the original question refered to 200 & 300tdi which have different main boxes so the only gear that has the same ratio in both is 4th(direct), so if the two vehicles that are being compared have the same tyre size and speedo drive gear, then by comparing revs/mph in 4th will show up a variation in transfer box ratio's. Quote Link to comment Share on other sites More sharing options...
discojmz Posted January 9, 2008 Author Share Posted January 9, 2008 so im running about 500rpm higher at 30 in 4th than comical engineer does this mean i have a 1.4 transfer box? i dont think i should lol i have a lucarse alternator (not original) on the disco too. rev pulse from it shouldnt be wrong should it? it certainly seems to rev between the right bounds Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted January 9, 2008 Share Posted January 9, 2008 gave up smoking more than 10 years ago. You seem to be talking a load of rubbish. That is just my opinion, of course. Quote Link to comment Share on other sites More sharing options...
Comical Engineer Posted January 9, 2008 Share Posted January 9, 2008 Checked today: 4th gear showing 30mph = 1500rpm, 40mph = 2000rpm 5th gear showing 1450rpm = 40mph I would not guarantee the accuracy of either instrument but should be near enough. Hope this helps (and I've never smoked) Quote Link to comment Share on other sites More sharing options...
discojmz Posted January 9, 2008 Author Share Posted January 9, 2008 thanks again mate could just do with a 200tdi to compare now jim Quote Link to comment Share on other sites More sharing options...
RRX Posted January 10, 2008 Share Posted January 10, 2008 Same ratios as comic engineer in mine matey. Maybe you got a special one Quote Link to comment Share on other sites More sharing options...
discojmz Posted January 10, 2008 Author Share Posted January 10, 2008 maybe i did! but at only 17k old mine sounds rough in neutral ticking over (a shaft bearing aparently) and after a long run down the motorway it goes incredibly hard to shift. not impressed. time to complain to the garage that had it done and give mr ashcroft a pm i think! Quote Link to comment Share on other sites More sharing options...
discojmz Posted July 14, 2008 Author Share Posted July 14, 2008 Ive still not resolved this so ive come back to add some more. my transfer box is 28D304571E which I believe should be a 28E box. 28E is not listed on ashcroft's website but 28D is, and corresponds aparently to 1.22:1 which should be correct?? Now ive just taken it for another run and at 30 in 4th I see 17-1800rpm and at 40 I see near 2500rpm I know the vehicle had a replacement lt77 in the past, but if for example a v8 one had been put in by accident I would have taller gears than usual not shorter wouldnt I? It has had a replacement lucarse alternator at some point, If the pulley were too small on this then I would get incorrect pulse frequency wouldnt I? I just once warm, nailed the throttle for as long as I dare, and watched the needle swing up past 4500rpm and would have probably kept going had I not let off. This seems very high but I dont know, My tickover is around the 800rpm point which seems right. Any insight you can give would be much appreciated and would stop me going slowly insane. It's bugging me now, and Im all but guessing Quote Link to comment Share on other sites More sharing options...
discojmz Posted July 14, 2008 Author Share Posted July 14, 2008 just done the 2.976D/MTR calcs from ashcroft's website and it certainly looks like ive got a 1.4 transfer box, but the number stamped into the casing suggests otherwise Quote Link to comment Share on other sites More sharing options...
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