Oem torsen LSD test (Need volunteers)

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Oem torsen LSD test (Need volunteers)

Postby CMS-GT4 » Fri Feb 16, 2007 5:10 pm

Ok, so I have been doing some reading and I want to test out if this is a method to determine if you have lsd w/o opening the case.

I need a volunteer who knows they have a torsen in the rear and a volunteer of a known open lsd.

We need to try TEST 2. If this works, this might be a great help to the community.

How can you tell it's a TORSEN?
Well I'm no expert but there were a few obvious traits - stock Toyota diffs are TORSEN or open wheel - sometimes a diff might be changed internally with a mechanical action diff. TRD or CUSCO etc - When Juzza got his diff he scored one of these diffs by accident, on sharp slow turns the inside wheel chirps and squeals a little bit as it tries to keep up with the outside wheel - a TORSEN diff is super smooth. Anyway on the wrecker showroom floor the TORSEN diff has differences to an open wheel diff. With a TORSEN LSD on a workshop floor there are a couple of tests to do.

First is the spin one axle and the other axle spins same way - Torsen. If the other axle spins other way then go to test 2.


Test 2
Spin the input shaft of the diff. One wheel will may spin freely with the other stationary. I can hold one axle still, spin input shaft and the other axle will spin free. If I try to stop the spinning axle with my leg, just let the spinning axle rub my calf for example - the axle I am holding still with my hand will instantly start spinning in same direction. As soon as any torque is applied to the spinning axle - torque is transferred to the stationary axle and they spin together. TORque SENsing.

A metical clutch type LSD or cone type LSD tends to spin both wheels in same direction the whole time to a degree. There isn't so much "free wheeling" as available in a TORSEN.
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Postby Sifu » Fri Feb 16, 2007 5:42 pm

I have a torsen opened up and sitting in the back store room. I bought it off of Alcyon so if I can help let me know...
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Postby CMS-GT4 » Fri Feb 16, 2007 5:47 pm

I think it needs to be in the car for this test. However, you might be able to test it outside of the car. Maybe if you can get someone to turn the input and hold both sides of the output (just one hard than the other) we can determine if this test works.
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Postby Sifu » Fri Feb 16, 2007 5:48 pm

Yeah I figured as much. Just trying to help out, I'll try rotating it anyways to see what I get.
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Postby CMS-GT4 » Fri Feb 16, 2007 5:53 pm

Thanks. Let us know your results and if they match the description. I am curious how a known open diff reacts to the test in contrast.
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Postby darthripley » Sat Feb 17, 2007 5:48 pm

i'm 99.5% positive we have an open rear diff.
we already did the first test when we jacked the car up - the other axle spun the other way.
we can try the second test later this week or next weekend.
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Postby CMS-GT4 » Mon Feb 19, 2007 1:59 am

Keep us posted. The first test will never work on a torsen since a torsen becomes an open diff without load on both wheels.
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Postby darthripley » Mon Feb 19, 2007 4:40 am

that's interesting -- didn't know that about the 1st test.
if we have time tommorrow we'll give the 2nd test a whirl & i'll report back with the results.
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Postby Conan » Mon Feb 19, 2007 5:15 am

I will run test 2 on a torsen diff in a few days when my car is up in the air if I don't forget.
When in doubt - increase boost.
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Postby CMS-GT4 » Mon Feb 19, 2007 5:27 am

Please note the tip of plug as well. Male or female. That might also corilate with this.
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Postby Conan » Mon Feb 19, 2007 5:55 am

CMS-GT4 wrote:Please note the tip of plug as well. Male or female. That might also corilate with this.

Which plug? :shrug:
When in doubt - increase boost.
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Postby Denver_whiteST185 » Mon Feb 19, 2007 6:08 am

something i got from MR2OC.com

Does my MR2 have a LSD?
Quote:
Originally Posted by billwot
Here are the facts about the MkII MR2 and LSD:

It was not available on '91-'92 models

It was offerred as an option beginning in '93

It was only available on the turbo (E153 tranny)

On LSD-equipped cars, the A/TM designation on the dataplate in the driver's door will be 733/e153, or 735/e153

It is a visous coupling and CANNOT be identified by jacking the car up and turning one wheel.

If you look into the axle port of a factory LSD tranny, there will be visible bar between the 2 sides.*
*E153 Trans only, ALL S54 transmissions have this bar...NO S54 has an OEM LSD.

bill
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(not really, i just own a completely UNmodified 91 civic dx that gets 45+ mpg now)
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Postby etantshi » Mon Feb 19, 2007 6:15 am

Conan wrote:
CMS-GT4 wrote:Please note the tip of plug as well. Male or female. That might also corilate with this.

Which plug? :shrug:


I think he means the filler plug on the side.
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Postby maxaud » Mon Feb 19, 2007 5:49 pm

I know I have a TorSen. Whatcha need me to do?
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Postby CMS-GT4 » Mon Feb 19, 2007 5:52 pm

Read the tst directions and give it a try. I suspect you need two people to help.
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