Burntrubber Posted June 20, 2006 Share Posted June 20, 2006 Yeah I think it only works on clutch type and like you say if its been stripped and had the amount of tourqe it takes to make it slip changed. Yeap. Sounds cool fidelling with the torque via shims sounds like an awsome plan. . I have a clutch type LSD out of a Piazza which I intend on putting in one of my Gemini housings. When it was in the Piazza I lifted one wheel and I could turn it easy as like about 10kg's of my weight leaning on it. It still spun both wheels hard did afew skids before I pulled it out but I might get it shimmed to tighten it up maybe. Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted June 20, 2006 Share Posted June 20, 2006 and: locked = good for drifting where you want to be going sideways round corners...i REALLY wouldnt do it in a road car tho. I have heaps of mates with them in their road cars not a good idea in my opinion. Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 20, 2006 Share Posted June 20, 2006 I have a locked diff in my garage for if I ever go 1/4 mile. Prob have my LSD in by then tho. Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 20, 2006 Share Posted June 20, 2006 Adjusting the breakaway pressure The breakaway pressure can be adjusted by putting shims between the end of the disk/clutch stack and the case end plate. Putting in a thicker shim increases what is called the "preload" or the initial pressure on the disk/clutch stack. If you have the type with all flat disks and clutches, don't get too carried away with shims, because a little bit will make a big change. If you really intend to do this right, you will need a micrometer or at least a very accurate caliper. Be sure you measure each friction disk and plate separately, and keep notes. If you can't dial in the right breakaway pressure with shims, you can selectively change disks and plates to get the right combination. Breakaway Pressure What the heck is "breakaway pressure" anyway? The breakaway pressure is the amount of torque required to make the plates and disks slip. In practice, it is the torque generated between the rear tires when they try to go different distances. If you put a torque wrench on one axle shaft and lock the other one in place, then apply torque, the axle won't move until a certain pressure is reached. Then the axle will start to rotate, showing a constant torque resistance. That's the breakaway pressure. More on how to test this later. Quote Link to comment Share on other sites More sharing options...
drftnmaz Posted June 20, 2006 Share Posted June 20, 2006 Two people should be able to make an LSD slip one person should be able to lift one wheel and make it slip if not its a real tight LSD. I have done this on several cars me an my mate could'nt get his S5 Rx7 to slip after he got it rebuilt by steelygears it even scuffs like a a lock diff on the gravel. steelygears do some dodgy things to there diffs i know someone that used to work there and now runs his own diff shop... i asked him about shimming and we took apart a hilux lsd and he showed me how they work and why they become weak... its mainly gear wear where they throw out under accleration and you can shim them a little to counter the wear but steely and other shops just shim the fuck outta them so you might as well lock the diff up cause it an't really a lsd anymore. Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 20, 2006 Share Posted June 20, 2006 ^^^ sounds like it could be true. BUT you can also shim them if you want differant controll from your diff. Wouldnt be surprised if some race cars have shimmed LSDs even in brand new recond diffs. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted June 20, 2006 Share Posted June 20, 2006 shimming is the method to tighten them up. factory lsd's prolly have shims. shim stock = the universal standard for that kind of thing. nowt wrong with it. Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 20, 2006 Share Posted June 20, 2006 shimming is the method to tighten them up. factory lsd's prolly have shims. shim stock = the universal standard for that kind of thing. nowt wrong with it. Clutch types do have them standard. Well a plate/shim. Depending on how many/size shims you use will determine when/how much slip is allowed and when not. Think you can also shim to determine how smoothly the clutch grabs. So you can completely customise a clutch type LSD with shims. Quote Link to comment Share on other sites More sharing options...
drftnmaz Posted June 21, 2006 Share Posted June 21, 2006 but theres a point where theres too many shims and it wouldn't unengage so why waste your money? just run a locker Quote Link to comment Share on other sites More sharing options...
AE25 Posted June 26, 2006 Share Posted June 26, 2006 quick but not so accurate way to check diff ratio.. jack one wheel off ground but other one must stay still (wont work if you have locker/strong clutch type lsd), gearbox in neutral, mark drum/disk against backing plate and diff pinion flange against diff housing... turn driveshaft and count how many turns to do exactly TWO turns of the disk/drum. the amount of driveshaft turns is your diff ratio... no calculations required. oem toyota clutch lsd use various thickness clutch plates to add up to the correct thickness. i have 'photocopied' toyota manuals for T, F and G series toyota lsd's if anyone is seriously interested in doing a diy rebuild.. will need to scan it onto comp etc so no rush to do it. i once took an 8" lsd to steelie which he was going to put in a stronger spring for more lsd action. dunno if he did it but when i went back to pick it up he didnt realise i intended it for tarmac/drift and he'd set torque to suit gravel.. took a week to do it.. took 2 months to redo it. after about the 5th visit.. it took him 10mins to strip it, shim it and set gear meshing etc. hes a good guy and very helpfull but slow turnover. doesnt help when he was involved in car accident Quote Link to comment Share on other sites More sharing options...
AE25 Posted June 26, 2006 Share Posted June 26, 2006 oh and doing burnouts/drift on a viscous lsd can cook the oil and they dont work no more locker best for drag/burnout mechanical (clutch) best for drift/race torsen or viscous good for street/race or whatever clutches do wear out eventually so need maintenance... viscous need oil changes... torsen lsd dont wear out. wouldnt want to use a torsen with overly large tyres as the small helical gears would cop a beating Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 26, 2006 Share Posted June 26, 2006 quick but not so accurate way to check diff ratio.. jack one wheel off ground but other one must stay still (wont work if you have locker/strong clutch type lsd), gearbox in neutral, mark drum/disk against backing plate and diff pinion flange against diff housing... turn driveshaft and count how many turns to do exactly TWO turns of the disk/drum. the amount of driveshaft turns is your diff ratio... no calculations required. Yeah thats basically same as said before. All the caluclation does is make it more acurate as you are doing it more times. If you did it a hundred turns then itd be bang on. Ill take a copy of those diff printouts while they are for offer. I will eventually be doing this with my diff thats just sitting. Quote Link to comment Share on other sites More sharing options...
mk2_escort Posted June 27, 2006 Share Posted June 27, 2006 my mate locked his diff in his escort 2 litre and he loved it lol. how much can you pick up a lsd for a escort for? Quote Link to comment Share on other sites More sharing options...
peteretep Posted June 27, 2006 Author Share Posted June 27, 2006 i would say minimum 1500 in an escort Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 27, 2006 Share Posted June 27, 2006 Bolt in Quife jobie bout $2300 Locked sucks + dangerous on road. Quote Link to comment Share on other sites More sharing options...
AE25 Posted June 27, 2006 Share Posted June 27, 2006 yeah lockers are cunty on the street doing slow turns and u-turns etc. ive always had one in my ke70 from day dot.. (last 3 years) 6" diff... upgrade to 6.7" then upgrade to 7.5" heh. just bougt 2way kaaz lsd for it now you realise those manuals are for toyota 6.7", 7.5" and 8" lsd. i doubt ford lsd would have identical diff. as a source for toyota lsd's... altezza have a 7.5" torsen lsd factory... GT-FOUR celica's have a 6.7" torsen in the rear.. ma61/ta63/ra63/aa63 GT spec toys have an optional 7.5" irs clutch lsd which can be converted to live axle. some cr30 townace/masterace have live axle 7.5" lsd but pretty rare to find. ga70/ma70/jza70 etc supra have 8" irs optional lsd. hilux have 8" live axle lsd yada yada. i'll see if i can get my scanner hooked up.. havent used it in a year Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 27, 2006 Share Posted June 27, 2006 you realise those manuals are for toyota 6.7", 7.5" and 8" lsd. i doubt ford lsd would have identical diff.i'll see if i can get my scanner hooked up.. havent used it in a year I have two Hilux diffs. One is going in the escort when I convert to the Ca engine as the standard diff aint gonna work to long. Thats why I want them, Quote Link to comment Share on other sites More sharing options...
peteretep Posted June 27, 2006 Author Share Posted June 27, 2006 lsds are only 1250 for an english diff from palmside Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 27, 2006 Share Posted June 27, 2006 Oh my bad. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.