LSD's or not LSD that is the question

[dangerous brain]

OK my aristo is supposed to have a supra LSD on it. I recently did a video of a donut and it appears only one rear wheel is lighting up and smoking which is the inside one. How do I tell by looking at the casing if indeed this diff is an LSD from a supra? Could the supra diff fit inside the aristo housing? Would low fluid level have any effect on the diffs capabilities? I'll think of other questions later.

[silvershark44]

OK my aristo is supposed to have a supra LSD on it. I recently did a video of a donut and it appears only one rear wheel is lighting up and smoking which is the inside one. How do I tell by looking at the casing if indeed this diff is an LSD from a supra? Could the supra diff fit inside the aristo housing? Would low fluid level have any effect on the diffs capabilities? I'll think of other questions later.

 

Have you checked the chassie code in the engine bay? On the sup it should end with a B for LSD i think. Do a search to check im right.

[dangerous brain]

Yeah thats all well and good but my diff is supposed to be changed to a mkiv supra LSD from the aristo diff that was there. So if I look at my VIN plate all it will tell me is the diff that was fitted at the factory. What I really need is to know if there is a code on the housing that I can see externally to check if this diff is a supra diff or if its still the original aristo non-lsd diff.

This may only give me the housing information. At which point I will pull the diff out and split the housing and see what is actually inside there. If there is still a non-LSD aristo diff in there I will be considering my options.

[silvershark44]

Oh right I understand. Yeah.............havent a clue mate sorry.

[dangerous brain]

Might have to post in supra tech and not in non supra tech

[JamieP]

Just watching your vids DB:cool: there is no way that has a lsd:)

[The Restorer]

Can't you tell by jacking the car up, putting it in neutral, taking off handbrake and spinning the wheels.

 

If the opposite wheel goes in the opposite direction you have LSD.

[Thorin]

Can't you tell by jacking the car up, putting it in neutral, taking off handbrake and spinning the wheels.

 

If the opposite wheel goes in the opposite direction you have LSD.

 

Unfortunately that trick doesn't work with Torsen LSD's.

[dangerous brain]

Just watching your vids DB:cool: there is no way that has a lsd:)

 

Absolutely sure no way I could have a problem with an LSD then? Great thats another load of horse crap I've been fed then

[carl0s]

Can't you tell by jacking the car up, putting it in neutral, taking off handbrake and spinning the wheels.

 

If the opposite wheel goes in the opposite direction you have LSD.

 

Surely that just means you have a standard differential, which all cars have any way.

[dangerous brain]

Well my mrs goes home this afternoon so I am left twiddling my thumbs for a week on my own. I was thinking of opening up the diff to see whats inside. I take it there are no spring loaded nasties preventing me from putting it back together?? Whats involved in opening up a diff?

[JustGav]

Well my mrs goes home this afternoon so I am left twiddling my thumbs for a week on my own. I was thinking of opening up the diff to see whats inside. I take it there are no spring loaded nasties preventing me from putting it back together?? Whats involved in opening up a diff?

 

Dude, not worth the effort, VERY messy and a bugger to do... and what will it help, you could simply look at it, and go 'Aaaaah'... then have to refill it and seal it again...

[garethr]

Can't you tell by jacking the car up, putting it in neutral, taking off handbrake and spinning the wheels. If the opposite wheel goes in the opposite direction you have LSD.

Same direction = LSD. No idea if it works for a Torsen.

[dangerous brain]

Dude, not worth the effort, VERY messy and a bugger to do... and what will it help, you could simply look at it, and go 'Aaaaah'... then have to refill it and seal it again...

 

Yeah but it'll prove one way or the other that its an LSD or not no?

[dangerous brain]

OK I have been looking at this thread http://www.mkivsupra.net/vbb/showthread.php?t=4959&highlight=diff+part+numbers

people that know significantly more than me say that the only way to know for sure is to open her up and have a look at what is inside. I just jacked her up and it appears to me that the diff has allready been opened before as it has that orange liquid sealant oozing out of it everywhere. There is a number stamped on the aluminium rear part which is W11116194. There is a 3 on the steel casting and what looks like an 8 or a B also on the casting.

pictures

http://www.showoffyourcar.com//cars/TOYOTA/19625.jpg

http://www.showoffyourcar.com//cars/TOYOTA/19626.jpg

http://www.showoffyourcar.com//cars/TOYOTA/19627.jpg

http://www.showoffyourcar.com//cars/TOYOTA/19628.jpg

 

So whats the verdict here? Do I take the damn thing off in the morning and will someone here be able to tell me from the pictures of the inside gubbins what diff it is?

 

Under heavy acceleration from a standstill around a 90 degree bend (out of a T junction) the back end tries to step out a bit if you keep your foot down it comes back inline with a small fishtail wobble. But that video is damning it as an open diff as is the VIN plate.

[Guest W4SIM]

Unfortunatly mate, THE only way to tell what diff is in there is to open the diff itself and see whats inside it.

 

The orange stuff is just a sealent which is also used for a repair job, as that is the most common place where a diff will start leaking.

 

More unfortunatly though, from what your telling is, it seems like you've been had! [sHOCK][/sHOCK]

[H7ERO]

if you show me a picture of inside the casing i will tell you what type of diff it has:)

 

this isnt a really long hard or spring loaded job in my opinion,

 

all you have to do is drain the oil from the plug at the bottom of the casing (probably could do with a change anyway)

 

suport the casing

 

remove the rear mounts (the 3 allen key bolts)

 

remove the casing bolts x 4

 

knock with a dead blow mallet or wood or somthing to break the seal and pull off

 

you will now be able to see clearly inside

 

to replace reverse procedure just calean off the old sealant and use new

 

and as note the red sealant is from the toyota factory too all my toyotas since about 1990 have this red sealant on the drivtrain componants - thats not to say it hasnt been changed as halfords sealant is red too but you dont need to asume its been messed with

 

removing a differential from the casing is a long and spring loaded job requireing a dial guage and very acurate torque wrench (i forgot the name for this tool) to measure and set the backlash between the ring and pinion

 

never bother doing that just replace the whole casing with diff inside much easier -thats unless you want to fit a kaaz or somthing or change your final drive ratio

 

also low oil level or poor oil will only affect the opperation of a plate type LSD not a supra torsen ( my corolla diff used to act like an open diif once teh oil had degraded after a drift day or too untill i started using much higher quality oil) thats cos plate diffs relly on friction and torsen is mechanical in action so will operate even with out oil

 

sorry for rant diffs represent one of the major factrore:innocent: for me in buying a car!

[Gruggs]

any idea what pre-load to set a TRD LSD to for drag racing?

 

Cheers

 

G

[Guest W4SIM]

Ok, if this doesnt help you nothing will. Like i said above, the ONLY way to tell what kind of diff you have is to look inside it.

 

Heres what you should see:-

 

The first one is an OPEN DIFF.

 

The second one is an LSD.

 

The third picture shows them together.

 

(Heres hoping this woeks )

[Terminator]

Good pics to have as a reference. This is the only well to tell is to open up the diff. I have an open diff and an LSD diff the casings are identical. With them side by side even the Japanese characters appeared the same.

[Guest W4SIM]

sorry for rant diffs represent one of the major factores:innocent: for me in buying a car!

 

So i take it as your a big fan of OPEN DIFFS then!!!

[dini_the_owl]

I also have an open diff and 2 tt lsd diffs and the casings are not identical,the szr had an optional torsen and has the casing looks like the n/a open,but certainly the tt lsd and n/a open diff casings look very different,tt has cooling fins which drop down,n/a is also more rounded, the best way is to split if your in any doubt, but from what youve said it looks and sounds like an open,personally i didnt think the aristo had the option anyway.

heres my tt lsd

[Guest W4SIM]

Sorry i must apologise, the pics i have provided are from the Soarer TT and not the Supra's.

 

Yes your right, there are cooling fins on the Supra TT diff, but there arnt any on the Soarer TT's, which is why you cant tell the difference from the outside.

 

Personally im not too sure which one the Aristo uses, id imagine it to be the Supra one.

[dini_the_owl]

That seems to me like the best thing to do if in doubt, The aristo from what i can remember looks the same as the supra open diff,ie more rounder with no fins.heres the pics

[carl0s]

Why don't you.. Jack up one side of the rear, then get in the car and try to drive off. If the car stays still, it's an open diff. If the car moves away then it's an LSD. Yeah?

 

I suppose a less destructive method would involve some kind of roller tray for one of the wheels.