Matt Harwood Posted December 18, 2002 Share Posted December 18, 2002 Wheelspinning it is then Quote Link to comment Share on other sites More sharing options...
Gordon F Posted December 18, 2002 Share Posted December 18, 2002 To find out which type of diff you have, you should: (1) Go down to Blockbuster, rent a copy of 'My Cousin Vinnie' and sit down and watch it. then (2) Wheelspin your car off a pavement. Quote Link to comment Share on other sites More sharing options...
JamesG Posted December 18, 2002 Share Posted December 18, 2002 Nathan, Just been reading your home page about your Supra. Sounds absolutely fantastic! I've been glued to reading about all the upgrades for the last hour despite my stomach telling me to go and get some food... James. Quote Link to comment Share on other sites More sharing options...
Thorin Posted December 18, 2002 Share Posted December 18, 2002 Don't think Nathan has the Supra anymore... http://www.concept-shop.com/nath/indexframe.html Quote Link to comment Share on other sites More sharing options...
Nathan Posted December 18, 2002 Share Posted December 18, 2002 Originally posted by Thorin Don't think Nathan has the Supra anymore... http://www.concept-shop.com/nath/indexframe.html Bugger. Rumbled. Now I've got to change my email adress and everything that relates to it....... On second thoughts.....far too much aggro. I hope no-one minds and doesn't think I'm someone pretending to own a Supra just to get on the site..;-) Nathan TDI PLC Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 18, 2002 Share Posted December 18, 2002 Just out of interest has anyone else swapped diffs? Quote Link to comment Share on other sites More sharing options...
Alex Posted December 18, 2002 Share Posted December 18, 2002 You normally just swap the internals...has CW or TDI installed a TRD one? As I would believe you would normally only upgrade rather than replace? And, is it likely this Diff is knackered because of low/no oil or knackered oil? Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 18, 2002 Share Posted December 18, 2002 Opp's I meant changed diffs. I thought changing internals was a absolute bastard. Quote Link to comment Share on other sites More sharing options...
Branners Posted December 18, 2002 Share Posted December 18, 2002 I swapped a non-lsd diff to an lsd one from Leons car a while back. Straight swap, nothing else was required. Late spec mkivs may have a different diff though so thats worth looking out for. JB Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 18, 2002 Share Posted December 18, 2002 Thanks John, that expalins it, as mine was a straight swap over too, no parts require except the bolts. I got mine from a donor car of the same year as mine. Still have a standard diff if anyone needs one. Quote Link to comment Share on other sites More sharing options...
ninja_eli Posted December 18, 2002 Author Share Posted December 18, 2002 Branners, thats interesting. I was told by the Toyota dealer in US, that the non LSD diff has a slightly narrower neck, therefore requiring two next axles, and a propellor shaft for the change. By straight swap do you mean these were unnecessary to change? It would make my life a lot easier! Will test my Supra out tomorrow for evidence of LSD. Just hope its a dry day Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 18, 2002 Share Posted December 18, 2002 Mine was, as I said before the two looked identical. One left one line of rubber the other leaves two. You are talking to US guys about a Jap car, they have very few Japs over there. US diffs may be different from UK and Jap. I am sure people have put UK cooler diffs in Japs cars with out changing shafts. BTW we have been told complete bollocks by dealers over here, so may be it is no different over the pond. Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted December 19, 2002 Share Posted December 19, 2002 got me more confused now. whats the difference between a diff and lsd and whats the advantage`s ALFQZ looks like my code, this is the non LSD version? i have a netto economy tt facelift jap spec i read a site before saying if you had B on your plate it had LSD if it had A it was a non LSD.i have the A on my plate would it be worth trying to get a stock LSD put on or maybe get a TRD or CUSCO upgraded one put on. does LSD spin one wheel opposite way to aid grip when the wheels are spinning. what will a non LSD car be like. i used to find it hard getting car rear end out, where as my mates uk spec squirms about so easy. i heard LSD was good for drag racing.just curious how much difference there is. thanks Quote Link to comment Share on other sites More sharing options...
Gordon F Posted December 19, 2002 Share Posted December 19, 2002 Mark The purposes of the diff are (1) To turn the drivetrain though 90 degrees (propshaft to driveshaft) (2) To allow the inner and outer wheels to rotate at diferent speeds when cornering. With a non LSD, if you had one rear wheel on tarmac, and one in mud, and tried to drive off, the wheel in the mud would just spin and the car would not move. This is because the drive from the car will take the path of least resistance. With an LSD, it will allow a small amount of slip, to enable the cornering as above, but if one wheel starts to rotate much faster than the other, like the one in the mud spinning, the diff will 'lock' and apply equal drive to each wheel. If you look at Steve's picture on this thread, the left hand wheel has lost traction and started spinning, and because there is no LSD to lock the two rear wheels together, it has just kept spinning as more power is applied. The wheels on an LSD car will only spin if both wheels lose traction, and so, will leave two tyre marks. HTH Quote Link to comment Share on other sites More sharing options...
Branners Posted December 19, 2002 Share Posted December 19, 2002 Originally posted by ninja_eli Branners, thats interesting. I was told by the Toyota dealer in US, that the non LSD diff has a slightly narrower neck, therefore requiring two next axles, and a propellor shaft for the change. By straight swap do you mean these were unnecessary to change? It would make my life a lot easier! Will test my Supra out tomorrow for evidence of LSD. Just hope its a dry day Direct swap, Leon unbolted the old one, bolted the new one in, bled it through and off we went. No driveshafts or propshaft changes required. I believe Leon then went on to drop in a UK spec diff with cooler to his car without any change to drive shafts or propshafts. So Im not sure what the US dealer was on about. If yours is a 93-96 car then just find a car in a scrapper and buy the diff, or give Leon a call on 01908 367100 and see if he has a spare or can get a spare. Infact I seem to remember JIC having a spare LSD diff sitting there, but that was about 18 months ago. Fitting an LSD will completely change the way the car behaves in slippery conditions. Before I felt wheelspin I used to just keep my foot down and wait for it to sort itself. With the LSD I tried that at Pod and found myself sideways at 80mph. JB Quote Link to comment Share on other sites More sharing options...
GavinL Posted December 19, 2002 Share Posted December 19, 2002 Leon had a LSD diff in stock a few months back Quote Link to comment Share on other sites More sharing options...
ninja_eli Posted December 19, 2002 Author Share Posted December 19, 2002 Okay, scientific experiment carried out; Results as per two pics shown. Now that looks like LSD to me? What do you guys think? It looks as though Japan is wrong about the configuration of my car and that the car's tag is right? The length of the tyre marks is about 3 metres or so. I couldn't be bothered to take it out of my warehouse, so I spun it in there. I know it may be a bit of a stupid question, but do you think that is enough room to get the answer right? I guess it is as it would otherwise have just been one line, no? I could make a movie about this sinister situation.... Quote Link to comment Share on other sites More sharing options...
ninja_eli Posted December 19, 2002 Author Share Posted December 19, 2002 The second pic: Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 19, 2002 Share Posted December 19, 2002 Just for demonstration purposes, only of course, I left a tell tale of a LSD at work last night. A bit feint but it shows both wheels spun up on take off, RLTC off. The lines go for about 3 m but not visible in the photo I only got the one line with the standard diff. Quote Link to comment Share on other sites More sharing options...
ninja_eli Posted December 19, 2002 Author Share Posted December 19, 2002 ha ha ha cheers Terminator. All for the causes of science and education eh? So I guess mine looks like LSD? What do you think Nathan? I think I'll give the number listed a call to see if he has an LSD diff. The only thing is this has become a bit of a issue between me and Toyota. It's a little mad that their database is so wrong. Quote Link to comment Share on other sites More sharing options...
Doughie Posted December 19, 2002 Share Posted December 19, 2002 Just one thing here to add : - If you get ONE black line then i agree that this indicates no LSD on the car. - If you get TWO black lines then surely this indicates that you *MAY* have an LSD on the car (but not *necessarily* so). Reasoning: If both rear tyres are on a smooth flat surface then they should get equal grip/traction with the surface and therefore both spin if enough power is applied (even with no LSD). The "one black line" scenario should only happen when one rear tyre has a bit less grip than the other and then it will spin up and keep spinning away the power, therefore resulting in only 1 black line. comments ? Quote Link to comment Share on other sites More sharing options...
adi Posted December 19, 2002 Share Posted December 19, 2002 id agree... its hard to tell from that test. In a straightline with equal traction the torsen diff acts as an open (ie non LSD) diff. All it takes is a bit of uneven road or tyre pressure and the results may well be different. Quote Link to comment Share on other sites More sharing options...
Nathan Posted December 19, 2002 Share Posted December 19, 2002 Originally posted by ninja_eli ha ha ha cheers Terminator. All for the causes of science and education eh? So I guess mine looks like LSD? What do you think Nathan? I think I'll give the number listed a call to see if he has an LSD diff. The only thing is this has become a bit of a issue between me and Toyota. It's a little mad that their database is so wrong. Hi there, Personally I'd say that it would be difficult to tell given the test you have done. Not only is the distance fairly small but the surface (is it smooth concrete?) wouldn't be the best judge either. Don't forget that it IS possible to get both wheels to spin on a car fitted without an LSD if both tyres are getting very similar traction.... As for the database being wrong....well, all I can say is how I find, and I've never had a problem with correlating JDM numbers to their spec, but like anything theres always a first. I'd say there would be more chance of an import coming over with a bent chassis plate than Toyotas data being wrong (after all I've seen plenty of bent chassis plates) but I'm happy to be proven wrong, and I honestly hope that I am. Give Leon a call and see if he has a s/h one, and if so, it might be worth whizzng up there and letting him decide if you need one. I'm sure he can carry out a sufficient wheelspin test ;-) Cheers Nathan TDI PLC Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted December 19, 2002 Share Posted December 19, 2002 Hi Nathan. Hope you are well. Trauling the BBS's?? Quote Link to comment Share on other sites More sharing options...
Nathan Posted December 19, 2002 Share Posted December 19, 2002 Originally posted by Terry S Hi Nathan. Hope you are well. Trauling the BBS's?? Ah...Terence. Likewise. Trauling? No, not really. I've never had the time to 'traul' anywhere on the web really. Got involved with this thread as there was some confusion between the originator and some information that had come from us but as you've probably read it's now all sorted. Everything OK? Nathan TDI PLC Quote Link to comment Share on other sites More sharing options...
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