Spoony Posted August 30, 2007 Share Posted August 30, 2007 im thinking about a lsd. the jspec has no lsd, the eu has 25% if youre on single turbo, the racelogic gives you as much as your wheels can offer. wouldnt it be a good thing to get a 100% lsd? 0-100 miles would be much faster. can anybody who has a lsd tell me if its worth the money? Link to comment Share on other sites More sharing options...
carl0s Posted August 30, 2007 Share Posted August 30, 2007 eh? What does racelogic traction control have to do with a limited slip diff? Many J-Spec cars do have the LSD, just not all. And what is the 25%, 100% stuff? Link to comment Share on other sites More sharing options...
Jake Posted August 30, 2007 Share Posted August 30, 2007 the jspec has no lsd Wrong. Link to comment Share on other sites More sharing options...
RobSheffield Posted August 30, 2007 Share Posted August 30, 2007 Guy is from Germany so maybe his english isnt fantastic Im thinking he means that if RLTC cuts power when slip is met, then an LSD will stop it cutting in as more grip is there. Or maybe thats not what he meant, who knows Link to comment Share on other sites More sharing options...
robin Posted August 30, 2007 Share Posted August 30, 2007 Dont LSD's simply put power to the path of most resistance so either both wheels spin or neither vs an open which takes the path of least resistance? Link to comment Share on other sites More sharing options...
Spoony Posted August 30, 2007 Author Share Posted August 30, 2007 Im thinking he means that if RLTC cuts power when slip is met, then an LSD will stop it cutting in as more grip is there. this is exactly what im talking about how can i find out if my car has a lsd or not? 25% or 100% is the closing of the LSD Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 30, 2007 Share Posted August 30, 2007 The build plate on the inner front wing will show if it had a factory fitted (Torsen type) LSD, it won't show if it has had a different one fitted, or one removed at a later date. Safest and surest way is to drop the diff, remove the back cover, and have a look inside. Link to comment Share on other sites More sharing options...
Darren Posted August 31, 2007 Share Posted August 31, 2007 My VVTI came with LSD Link to comment Share on other sites More sharing options...
carl0s Posted August 31, 2007 Share Posted August 31, 2007 I bet more than half of the j-spec turbos came with them too, and any 6spd na szrs. Link to comment Share on other sites More sharing options...
RedM Posted August 31, 2007 Share Posted August 31, 2007 Mine came with a LSD. I'm lost! Link to comment Share on other sites More sharing options...
SupraPL Posted August 31, 2007 Share Posted August 31, 2007 AFAIK all TT (JDM and UKDM) and SZ-R non turbo have a LSD. Link to comment Share on other sites More sharing options...
Spoony Posted August 31, 2007 Author Share Posted August 31, 2007 The build plate on the inner front wing will show if it had a factory fitted (Torsen type) LSD, it won't show if it has had a different one fitted, or one removed at a later date. Safest and surest way is to drop the diff, remove the back cover, and have a look inside. mine is saying A02B, which means i have a TRD LSD right? i have found some informations: The Torsen diff is a standard fitment to all 6 speed mkiv's, alot of the Auto TT's and you'll even occasionally find it on a NA. You can tell if your Supra has a Torsen diff by reading the Trans/Axle code on the Engine Tag which is situated under your bonnet. The last letter of the 4 character code (eg. B03B) denotes the diff type which is "A" for a std diff and "B" for a Torsen diff. The crown wheel on the B series is 220mm whilst on the A series it's 200mm. The Torsen (TORque SENsing) LSD (Limited Slip Diff) works quite differently to the TRD LSD. The Torsen is a Torque Multipling type of diff with a multiplication ratio of around 5:1. What this means is that whatever torque can be sent to the wheel with the least traction, it can send up to 5 times that torque to the wheel with the most traction. Its biggest advantage is that it can do this extremely quickly and doesn't ever lockup the ratio, but is continuously "sensing" and adjusting the torque between the two wheels. Its only real disadvantage is that when one wheel has no torque available (say it spinning in mud), then 5 times nothing is still no torque to the other wheel, so you can get stuck just like a std diff. Once the car is moving however this cannot happen. See this Torsen Differential Article for a detailed explanation of how the Torsen diff works. The TRD LSD is a standard type LSD in that it uses clutch packs to transfer torque from one wheel to the other. Transferring torque via clutch packs will be a slower process then the Torsen transfer method and it will absorb more energy from the engine when doing so. However we are probably only talking a few hundreds of a second difference here and maybe a few hp. The main disadvantage of the TRD diff is that it can "lockup" the ratio between the two wheels at 1:1. This means both wheels will then turn at the same speed and if this happens on a corner, it would be exciting at the very least. This "lockup" is also its only advantage over the Torsen diff as even when one wheel is in the mud, the other wheel can provide traction to pull you out. My personal preference is for the Torsen diff as it usually comes free with the car, reacts quicker and aborbs less power and will never accidentally lockup. However, if you want to go rally driving in your mkiv Supra (don't laugh, there's guys in the USA that do just that) then the TRD would be the better bet. this means a torsen LSD (with b in the number in the front wing) is better for the track, but the TRD LSD also locks to 100% if nessesary. correct? Link to comment Share on other sites More sharing options...
DamanC Posted August 31, 2007 Share Posted August 31, 2007 Correct Link to comment Share on other sites More sharing options...
robin Posted August 31, 2007 Share Posted August 31, 2007 Thats a good rear. Nice to know what torsen actually means. Link to comment Share on other sites More sharing options...
Thorin Posted August 31, 2007 Share Posted August 31, 2007 All 6-speed manuals came with the Torsen LSD, it was an optional extra on autos. Link to comment Share on other sites More sharing options...
robin Posted August 31, 2007 Share Posted August 31, 2007 Didnt all UK cars have LSD too? auto and manual? Link to comment Share on other sites More sharing options...
JohnA Posted August 31, 2007 Share Posted August 31, 2007 ... wouldnt it be a good thing to get a 100% lsd? 0-100 miles would be much faster... 100% lsd would be like a kart --- both wheels have to move exactly the same. This is sometimes acceptable on dirt, but on tarmac you risk being thrown out of the road on the first bend. Link to comment Share on other sites More sharing options...
tDR Posted August 31, 2007 Share Posted August 31, 2007 AFAIK all TT (JDM and UKDM) and SZ-R non turbo have a LSD. Incorrect. JDM GZ auto's came with an LSD, as did manuals. Other autos (RZ, RZ-S) did not, but the lines are somewhat blurred because it was an optional extra that could be specified when ordering. Facelifts get blurrier still, my car for example is a non vvti facelift which has all GZ goodies like full leather and electric seat but came with an open diff. Not going to go into N/A's, I thought we were talking about real Supras Link to comment Share on other sites More sharing options...
tDR Posted August 31, 2007 Share Posted August 31, 2007 mine is saying A02B, which means i have a TRD LSD right? ....SNIP... correct? No, none of the cars came from the factory with a TRD mechanical LSD fitted. It's an aftermarket item and a completely different kettle of fish to the factory Torsen LSD. Incidentally, it's what's now fitted to my originally open diff'd car Link to comment Share on other sites More sharing options...
Spoony Posted August 31, 2007 Author Share Posted August 31, 2007 so i have nothing, just shit in my diff?? but ok, next one...mine is a GZ (leather, electric seats, spoiler and all the extras), so it should have a LSD. ??? Link to comment Share on other sites More sharing options...
JohnA Posted August 31, 2007 Share Posted August 31, 2007 so i have nothing, just shit in my diff?? ?? It could have been worse Imagine having a diff in your toilet:eyebrows: Link to comment Share on other sites More sharing options...
Thorin Posted August 31, 2007 Share Posted August 31, 2007 so i have nothing, just shit in my diff?? but ok, next one...mine is a GZ (leather, electric seats, spoiler and all the extras), so it should have a LSD. ??? You have the factory Torsen LSD, NOT the TRD diff. Link to comment Share on other sites More sharing options...
Spoony Posted August 31, 2007 Author Share Posted August 31, 2007 plate in the front wing says A02B, so are you sure? hopefully one day i will understand what is going on in these japanese magic brains.... Link to comment Share on other sites More sharing options...
razza Posted August 31, 2007 Share Posted August 31, 2007 correct, as it's the letter AFTER the the numbers, NOT before. I too have a "B" at the end of mine so have the Torsen LSD fitted:) (re-read the long post you put on for clarification) Link to comment Share on other sites More sharing options...
Fifty Posted August 31, 2007 Share Posted August 31, 2007 lsd here 1994 GZ Auto TT Rich Link to comment Share on other sites More sharing options...
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