when I turn one rear wheel, the scond one turns on the opposite side. is it normal ?
if I turn the drive shaft with hand, both wheels turn in one direction

nearly a year ago I stripped down the diff for ispection, everything was in good shape. and clearly remember both wheels were turning in the same direction when I turn one wheel. oil in it is Motul gear competiotion 75w-140. (haven't changed it since strip down)

it's RS diff, with oem LSD in it, plates are rearranged correctly

so, is it acceptable to turn rear wheels in opposite direction ?

 

Same happens with my front wheels. Don't know about rears, never tried it.

Should be normal with LSD's.

 

My front and rear move in opposite directions and are open diff.

IMHO, this may not mean anything as the LSD will work when under acceleration. If it was a locker then it should turn in the same direction at all times, but I don't know about LSD's.

 

Sounds like the plates are either worn out or have too much friction modifier in them.
OR even worse, the plates are broken on one side (which was my problem).


If you remember the whole spider gear assembly, you spin one side of the gear and the other side will spin in the opposite direction (much like an open diff).
Drain the oil to see if it comes out silver shavings and see if chunks are on the magnetic drain plug.

 

^^
as for open diffs - yes, it's normal that they spin opposite directions, no questions there

@ Raptord
afaik front one is not plated LSD, it's torsen type, so nothing to worry about there too

I know that plated LSD locks up within speed difference between tires
but I also heard that they should spin in the same direction when hand turned (that did my diff some time ago, but no more)

more comments and opinions are welcome

 

Piro Fyre

thanks for good hint
I haven't used any friction modifier in it at all
seems I have to strip down the diff for inspection


how common is plate wear out in evos ?

 

Wait so I have 03(oem open front diff) and I had my rear diff sent out to TRE for the fully built 12 plate max lock setup. Now everything seems fine EXCEPT when I turn slowly in parking lots or busting a U Turn or parking I hear like a binding sound coming from my rear diff area. No d of like what a welded diff sounds like. You can feel it too. I put redline heavyweight shock proof in the rear diff and that might be the culprit maybe too aggressive, TRE told me to change that out with something less aggressive but my evo is down for a couple more weeks so I have yet to try it. What do you guys think? Also can the rest diff be anything other than clutch style ?

 

The rear diff is clutch type, in stock form it won't lock if you turn the wheel by hand which is why the wheels spin in different directions. With a max plate 12 upgrade the plates are sprung way up and the wheels will spin the same direction when turned by hand because the diff is always partially locked. The 12 plate is very sensitive, it locks quick and that's why it acts kind of like a welded diff with slow turns.

Opens diffs always spin opposite directions because that's how they work with the spider and sun gears. Many mechanical type LSD's (wavetrac and quaife) do the same think. However with the mechanical LSD's if you raise only one wheel and try to turn it by hand you will be able to turn it maybe 25-40 degrees depending on how it's set up and the resistance will build with the degrees of turn. You can literally play the diff lockup out with your hands, it's pretty cool.

 

disassembled it today. think all is good in there. there was some pretty much metal shavings on oil drain magnet. oil was very slightly darker than new one, but that's normal I think after 1+ year of use. spider gears were in good shape. nothing was broken in disc/plate part. though some discs were slightly worn but the grooves on them were still well noticable

I mixed the disc/plate pairs so that they find new working surfaces with each other and reassembled them with correct sequence

now I have well known clunking noise that I experienced when I first restacked the plates but hope it will go away soon as before

p.s. the wheels still turn in opposite way when I turned one to forward direction. if turned backwards - both go to same direction now
don't know if it matters anything but that was the outcome of my todays job

 

Thankyou. What I got from this was that the ckunking is normal under slow aggressive turns. I just wanted to make sure I was hurting something from the binding sound it made. Stunt2 wrote he hopes the ckunking goes away as it did last time so I hope being that I've only driven 400miles on my new rear diff that it's still beading in/breaking in. I'm going to put a less aggressive fluid in it to see if the clunking will go away. Thanks for all if the advice