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Old 07-08-2019, 04:51 PM   #1
ryan.of.peachey
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Is this an LSD?

Can anyone tell from this photo if my diff is LSD or not? I'm thinking it's not, but need to know what kind of fluid to fill it with. Thanks.

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Old 07-08-2019, 05:04 PM   #2
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yes, lsd
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Old 07-08-2019, 05:17 PM   #3
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Thanks. I couldn't tell because the tag was too rusted.

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Old 07-08-2019, 05:18 PM   #4
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Google it. Seriously.

If both output shafts spin together it's an LSD.
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Old 07-08-2019, 05:19 PM   #5
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Thank you.

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Old 07-08-2019, 06:33 PM   #6
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Quote:
Originally Posted by Andre3127 View Post
Google it. Seriously.

If both output shafts spin together it's an LSD.
Unless it's a mechanical locker like a torsen.
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Old 07-08-2019, 06:59 PM   #7
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General Discussion is not a catch-all; please do not ask technical questions there. If you don't know where to ask your question, post it in General Technical and we'll move it to the appropriate subforum if necessary. Thanks in advance.
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Old 07-08-2019, 07:59 PM   #8
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I prefer Redline 75w90 or comparable GL-5 fluid in clutch typs LSD's (such as a stock e30 would have).





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Unless it's a mechanical locker like a torsen.

...or helical, but highly unlikely in an e30 diff....Torsen came in some z3 diffs, though.
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Old 07-08-2019, 08:35 PM   #9
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Originally Posted by ForcedFirebird View Post


...or helical, but highly unlikely in an e30 diff....Torsen came in some z3 diffs, though.

You can sometimes provide enough load on one output flange to cause a torsen to show function, haven't had a chance to try a helical setup the same way.


As an aside, torsens aren't bad in the snow and icy stuff the way I thought they might be, as long as you have even a little grip somewhere you'll go, and when you don't you can brake torque it.
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Old 07-08-2019, 08:47 PM   #10
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Both Torsen and helical will act like an open when one wheel is completely unloaded. This is why they both rotate the opposing wheel opposite when sitting on a bench.

Quaife is a 100% helical (I used one in the ls1 swapped Mercedes), but they both actually act similar when a wheel if lifted, but deceleration is argumental.

Torsen:

https://www.youtube.com/watch?v=JEiSTzK-A2A

Helical:

https://www.youtube.com/watch?v=W96fOdMZnXE


EDIT: Now a viscous acts in a very different way - kinda like a torque converter does in a slushbox transmissions:

https://www.youtube.com/watch?v=GDlTOPr_Acs
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Old 07-09-2019, 04:52 AM   #11
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A clutch pack (Salisbury), Torsen or Quaife can all load up and prevent wheelspin, up to the limit of their capability.
A viscous unit can only react to wheel spin.

I thought Quaifes had a small clutch pack or preload spring in the center that gave them something to push against so they can move the car even with one wheel off the ground.

Last edited by The Dark Side of Will; 07-09-2019 at 06:04 AM.
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Old 07-09-2019, 10:28 AM   #12
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I thought Quaife was another name for Torsen
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Old 07-18-2019, 08:07 AM   #13
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Quote:
Originally Posted by The Dark Side of Will View Post
A clutch pack (Salisbury), Torsen or Quaife can all load up and prevent wheelspin, up to the limit of their capability.
A viscous unit can only react to wheel spin.

I thought Quaifes had a small clutch pack or preload spring in the center that gave them something to push against so they can move the car even with one wheel off the ground.


Torsen type 2 units have a couple clutch packs so you can move the car in san Francisco parking situations (one wheel airborne). Does nothing when on the track flat out with one wheel airborne

https://www.s2ki.com/forums/s2000-un...embly-1161293/
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