Scott Posted August 19, 2011 Share Posted August 19, 2011 As above. I've just been thinking through the jobs I have to do on my car and I'm now thinking about the diff. I have a facelift RZ which I assume has the small diff? Can these take a reasonable amount of power or should I be budgeting for a big casing diff? Quote Link to comment Share on other sites More sharing options...
JamieP Posted August 19, 2011 Share Posted August 19, 2011 Be ok unless you start drag racing it, big diffs are near impossible to find these days anyhow, i have them all Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 19, 2011 Share Posted August 19, 2011 You diff hog Jamie Ive seen your spares shed as well Small case diffs are tough enough. Quote Link to comment Share on other sites More sharing options...
Scott Posted August 19, 2011 Author Share Posted August 19, 2011 Be ok unless you start drag racing it, big diffs are near impossible to find these days anyhow, i have them all I'll be on the strip at some point, definitely. I'll be aiming to go for it too. I'll just keep my eyes peeled and buy one when it comes up. What's the going rate on them Jamie? I take it I'll need the big diff prop too? Driveshafts? Cheers Quote Link to comment Share on other sites More sharing options...
JamieP Posted August 19, 2011 Share Posted August 19, 2011 I priced up a new one and it was £3000, id not sell one for less than a grand these days. Yeah you would need pre facelift TT6 prop and one of the driveshafts, cant remember which side now Quote Link to comment Share on other sites More sharing options...
Scott Posted August 19, 2011 Author Share Posted August 19, 2011 I priced up a new one and it was £3000, id not sell one for less than a grand these days. Yeah you would need pre facelift TT6 prop and one of the driveshafts, cant remember which side now Thanks for the info mate Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted August 20, 2011 Share Posted August 20, 2011 What's difference between them.my original did only used to do 1 wheel burnouts. Was a netto spec supra.bought another diff but took some getting it to fit You got any pics of big diff against a small diff Quote Link to comment Share on other sites More sharing options...
JamieP Posted August 20, 2011 Share Posted August 20, 2011 Quote Link to comment Share on other sites More sharing options...
Mario Posted August 20, 2011 Share Posted August 20, 2011 What's difference between them.my original did only used to do 1 wheel burnouts. Was a netto spec supra.bought another diff but took some getting it to fit You got any pics of big diff against a small diff Here you go, 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. 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. Quote Link to comment Share on other sites More sharing options...
mikeyb10supra Posted August 21, 2011 Share Posted August 21, 2011 I wondered if Jamie wold be first to answer. Have you got a thread alert setup whenever diff is mentioned Quote Link to comment Share on other sites More sharing options...
dude Posted August 21, 2011 Share Posted August 21, 2011 I may have a couple of 6 speed UK's up for grabs soon. Quote Link to comment Share on other sites More sharing options...
dude Posted August 21, 2011 Share Posted August 21, 2011 If your worried try this http://www.boostlogic.com/xcart/product.php?productid=157&cat=8&page=1 Quote Link to comment Share on other sites More sharing options...
Scott Posted August 21, 2011 Author Share Posted August 21, 2011 If your worried try this http://www.boostlogic.com/xcart/product.php?productid=157&cat=8&page=1 Might buy 2 just on the off chance With regards to the UK diff, do I need to add anything else? Would I be right in saying they have an oil sensor? Do I just get away with leaving that unplugged? Straight swap kind of thing? If so, how much for the kit (Prop, driveshaft, etc)? Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 21, 2011 Share Posted August 21, 2011 Do YOU really need a big case diff? Wouldn't you be better off just pulling the torsen out and putting in a TRD or are you more concerned about cracking the case? Quote Link to comment Share on other sites More sharing options...
Scott Posted August 21, 2011 Author Share Posted August 21, 2011 Do YOU really need a big case diff? Wouldn't you be better off just pulling the torsen out and putting in a TRD or are you more concerned about cracking the case? More concerned about BOOOOOMMMM. As far as I know the TRD cores only fit the larger case? Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 21, 2011 Share Posted August 21, 2011 You can TRD diffs for the smaller casing Quote Link to comment Share on other sites More sharing options...
Scott Posted August 21, 2011 Author Share Posted August 21, 2011 I don't think I could go down that route, if I bought it and it popped I would be raging... .not to mention a lot of money down the drain. For now I'd rather get the big diff in place then maybe think about the TRD diff for better traction at a later date Quote Link to comment Share on other sites More sharing options...
Kopite Posted August 21, 2011 Share Posted August 21, 2011 Not had any problems with mine although I still might look for a Giken one eventually Quote Link to comment Share on other sites More sharing options...
dude Posted August 21, 2011 Share Posted August 21, 2011 Might buy 2 just on the off chance With regards to the UK diff, do I need to add anything else? Would I be right in saying they have an oil sensor? Do I just get away with leaving that unplugged? Straight swap kind of thing? If so, how much for the kit (Prop, driveshaft, etc)? You just join the oil cooler pipes together, you should also change the NS shaft and the rear of the prop, i prob have a back half of the prop. Quote Link to comment Share on other sites More sharing options...
jagman Posted August 21, 2011 Share Posted August 21, 2011 This has got thinking! Where is the torque felt or most likely to twist - input shaft , diff , two output shafts ? The diff is altering speeds so alters torque - hmm first thoughts are the prop shaft would twist/ shear before diff got any effect - ie long shaft vs compact diff gears ? Quote Link to comment Share on other sites More sharing options...
dude Posted August 22, 2011 Share Posted August 22, 2011 This has got thinking! Where is the torque felt or most likely to twist - input shaft , diff , two output shafts ? The diff is altering speeds so alters torque - hmm first thoughts are the prop shaft would twist/ shear before diff got any effect - ie long shaft vs compact diff gears ? Easy, Mark Newman, 2 launches 2 diffs, all teeth sheered off the crown wheel, changed for big diff and broke propshaft so theres your chain of weakness. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 22, 2011 Share Posted August 22, 2011 Jamie twisted a prop shaft did he not? Quote Link to comment Share on other sites More sharing options...
JamieP Posted August 22, 2011 Share Posted August 22, 2011 I've broke loads of diffs and a couple of donuts, never broke a prop. Quote Link to comment Share on other sites More sharing options...
sdistc Posted August 22, 2011 Share Posted August 22, 2011 For what it's worth, I ran 650+ whp (but I can't remember the torque figures) on a facelift 6 speed for a while. It also coped with a couple of 750+ hp dyno runs. However, no sticky tyre launches as I was concerned, as you are, about popping it. I have since upgraded to the B03B casing with TRD centre - if you can't get one locally, you can buy either new or used from the US via MVP & Elmhurst Toyota. I bought a second hand diff from SF.com (can get for $1k USD), TRD centre with diff rebuild kit from Dusty @ MVP ($1k USD all up), and LHS axle from Curt @ Elmhurst ($250 USD), and Dusty shipped them all as one package to Australia. Quote Link to comment Share on other sites More sharing options...
Terminator Posted August 22, 2011 Share Posted August 22, 2011 Nothing wrong with the smaller case diff they will take serious abuse. If you are dragging you would be better off with an auto diff. Quote Link to comment Share on other sites More sharing options...
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