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Just Got A 4.10 LSD, WHAT FLUID???

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    Just Got A 4.10 LSD, WHAT FLUID???

    Hey all, just drove up to Lansing, MI and picked up a 4.10 LSD from an iX from AWDE30. I will be installing it in my 88 325i cabby. I know people have used 80W90 in these, but I have also heard that BMW is now recommending 75W140??? Should I also add some limited slip additive?

    Thanks in advance for your help!

    Brian

    1988 325iC Project - FINISHED!
    Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

    #2
    Redline 75w90 is the one that has the limited slip additive in it.

    -Erik

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      #3
      You really don't want to install an IX viscous diff in your car which should have a conventional clutch pack .

      And you really don't need limitied slip additive in them , regular 80/90 gear oil is fine .

      E30 M3 / E30 325is / E34 525iT / E34 535i

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        #4
        you don't need LS additive in the ix diff
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        Bimmerlabs

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          #5
          Please elaborate. Why don't I want to put this in my cabrio???


          Originally posted by Teaguer View Post
          You really don't want to install an IX viscous diff in your car which should have a conventional clutch pack .

          And you really don't need limitied slip additive in them , regular 80/90 gear oil is fine .

          1988 325iC Project - FINISHED!
          Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

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            #6
            it'll be fine - as long as the VC isn't burned out. I'd say what, 2 people on this site have actually tried it? probably with fried VCs too. everyone else is just repeating what they read in a post from 3 years ago..
            Build thread

            Bimmerlabs

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              #7
              Sigh of relief. What is VC... viscous clutch? Is this just the clutch mechanism like any other limited slip unit? I understand that they wear out, just as a clutch on a drivetrain would. Thanks nando.


              Originally posted by nando View Post
              it'll be fine - as long as the VC isn't burned out. I'd say what, 2 people on this site have actually tried it? probably with fried VCs too. everyone else is just repeating what they read in a post from 3 years ago..

              1988 325iC Project - FINISHED!
              Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

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                #8
                it's similar, yes. they don't realy wear out, but they are more easily burned up - running different tire sizes, patterns, improper towing, etc.
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                Bimmerlabs

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                  #9
                  well lets hope this one is in good shape and performs well.
                  Just for my knowledge, is the iX VC different from the typical LSD? And how?


                  Originally posted by nando View Post
                  it's similar, yes. they don't realy wear out, but they are more easily burned up - running different tire sizes, patterns, improper towing, etc.

                  1988 325iC Project - FINISHED!
                  Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

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                    #10
                    Originally posted by bimmerboy12 View Post
                    well lets hope this one is in good shape and performs well.
                    Just for my knowledge, is the iX VC different from the typical LSD? And how?
                    The iX diff is a viscous coupling diff. If you know how an automatic torque converter works, it's the same basic principle, using the resistance of the fluid passing through a series of vanes to control how much torque is transmitted.

                    The standard LSD uses a clutch pack setup consisting of multiple friction plates made of either steel or a friction material. The friction between the two dictates the amount of torque transmitted.

                    "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

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                      #11
                      im not sure if this is a myth, but i remember my dad mumbling one about how he used to put a higher viscous rated oil in his VC diff and it supposedly gives it a little more "lock" but again i don't have any way to verify this. It would seem as if it would work, no?

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                        #12
                        Very interesting. So did I score something special with a VC IX lsd, or are the clutch pack type (like I have on my CJ7) more reliable/cheaper to repair?

                        1988 325iC Project - FINISHED!
                        Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

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                          #13
                          Originally posted by blueapplesoda View Post
                          im not sure if this is a myth, but i remember my dad mumbling one about how he used to put a higher viscous rated oil in his VC diff and it supposedly gives it a little more "lock" but again i don't have any way to verify this. It would seem as if it would work, no?
                          no, the VC is completely sealed - you can't change the fluid inside without cutting it open and welding it back together.
                          Build thread

                          Bimmerlabs

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                            #14
                            Originally posted by nando View Post
                            no, the VC is completely sealed - you can't change the fluid inside without cutting it open and welding it back together.
                            that's correct and there is no fluid inside. it is filled with silicone (yes, like in boob jobs). the viscosity of the silicone changes due to friction. more details here : http://home.earthlink.net/~wardellhi...ral/iXfaq.html
                            '12 F30 328i Sport Line
                            '91 SpecE30 #523
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                              #15
                              Originally posted by nando View Post
                              no, the VC is completely sealed - you can't change the fluid inside without cutting it open and welding it back together.
                              There is a seperate compartment filled with silicone fluid that is factory sealed, but the gears obviously take gear oil. correct?

                              The more I look into this, the more unsure I am about putting this in my cabrio...

                              Advice???

                              1988 325iC Project - FINISHED!
                              Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint

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