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    Originally posted by Wanganstyle View Post
    REM polishing is worthless. Causes increase in tolerance and fractures from gear cutting root;
    LoL.

    Comment


      Top speed by Wanganstyle; LSD Diff Puzzle thread; ask me to spill beans here!!!

      Originally posted by TobyB View Post
      ...and the PRO3 cars that put the OS Giken diff in seem to lose most of a second a lap,
      pretty predictably.

      One data point,
      t


      That's fine; the GTS cars here gain about half a second to a second.

      It's all in the setup; we don't have pro3 here in NorCal; what can be changed on the footwork to suit?


      Sent from my iPhone using Tapatalk
      Last edited by Wanganstyle; 06-04-2016, 03:23 PM.
      OBD1 M54/M52TU swap as a M50b25

      Z4 non powered steering rack fits e30



      Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

      Comment


        deleted
        Last edited by Wanganstyle; 09-09-2020, 05:04 PM.
        OBD1 M54/M52TU swap as a M50b25

        Z4 non powered steering rack fits e30



        Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

        Comment


          There are just sooo maaaannnyyy holes in your apparently simple statement that my response was the most appropriate.

          Comment


            Sorry to break into the middle of your argument but if someone could enlighten me on these questions I'd be very thankful.

            Originally posted by Skarpa View Post
            Digging up this thread for a couple of questions.

            1. How would a diff with four discs (mild material), no preload and stock ramp angles perform?
            2. What is the correct method of setting up non-springed lsd? How is the shimming done and what is the tolerance for free play in the stack? Will heat expansion cause the diff to lock more easily?

            I'm pondering on a lsd setup for my car: Stock, 2 discs with added preload, 3 discs or four discs. I'm going on a budget so I think I'll try to avoid regrinding ramp angles. The diff is fora N/A street car with about 250 hp and 300 Nm. Mostly daily driver with possible occasional abuse. No track.
            E30 Armo "330i"

            Comment


              what can be changed on the footwork to suit?
              Hmm?

              And to be more specific, the PRO3 cars that have gone from a
              fully- functioning "fresh" stock LS to the OSG diff have gone faster,
              by some large fraction of a second, without any other changes.

              I haven't gotten around to trying the same experiment with a
              welded diff yet...

              t
              now, sometimes I just mess with people. It's more entertaining that way. george graves

              Comment


                deleted
                Last edited by Wanganstyle; 09-09-2020, 05:04 PM.
                OBD1 M54/M52TU swap as a M50b25

                Z4 non powered steering rack fits e30



                Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                Comment


                  deleted
                  Last edited by Wanganstyle; 09-09-2020, 05:05 PM.
                  OBD1 M54/M52TU swap as a M50b25

                  Z4 non powered steering rack fits e30



                  Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                  Comment


                    deleted
                    Last edited by Wanganstyle; 09-09-2020, 05:05 PM.
                    OBD1 M54/M52TU swap as a M50b25

                    Z4 non powered steering rack fits e30



                    Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                    Comment


                      Originally posted by Wanganstyle View Post
                      I have a great example for you of a failed REM gear
                      One gear? meaningless. There are sooooooo many reasons that one part can fail that determining it to be REM polishing is impossible.

                      Did it have a crack before hand? Was the batch misprocessed? Did the operator have a bad day? Was it exposed to higher than typical loads the day it failed? Was it exposed to higher than typical loads some time before it failed which set the failure process in motion?

                      The reason humans have to be taught root cause failure analysis is that they're naturally lousy at it.

                      Originally posted by Wanganstyle View Post
                      The factory street car Oem gearsets are chemically treated; the outer surface is harder than the inner. When you remove this the gears are not as durable anymore; it lost the nice surface and also material has been removed from the gear faces in polishing.
                      This is called case hardening. It typically goes a few .001's to a few .010's deep. REM affects the outer micron or so of the surface, which means the outer .00005" or so.

                      So tell me again how a .00005" REM polish eats away case hardening at least 100 times that thick.

                      Originally posted by Wanganstyle View Post
                      If you have never heard of WPC I suggest you check it out; it doesn't remove material and is factory in many high end aftermarket applications.
                      I know what WPC is.
                      What we're discussing is the harebrained claim that REM causes gear failures.

                      Originally posted by Wanganstyle View Post
                      Motorsports 210mm gears have been proven to be much more durable than polished old style REM.
                      That's nice. It's a claim and an anecdote. It is definitely *NOT* data.

                      Comment


                        Deleted.
                        Last edited by Wanganstyle; 09-09-2020, 04:10 PM.
                        OBD1 M54/M52TU swap as a M50b25

                        Z4 non powered steering rack fits e30



                        Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                        Comment


                          What's to understand it's that you've made a wacky claim and offered *nothing* to back it up.

                          Comment


                            Deleted
                            Last edited by Wanganstyle; 09-09-2020, 04:09 PM.
                            OBD1 M54/M52TU swap as a M50b25

                            Z4 non powered steering rack fits e30



                            Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                            Comment


                              Seeing a photo of a gear in which one looks polished, one doesn't, and thinking the one that looked polished had been polished because Dinan was mentioned was an erroneous, but perfectly reasonable assumption. Allowance for the error of that assumption is why I used the word "appears".

                              Originally posted by Wanganstyle View Post
                              REM polishing is worthless. Causes increase in tolerance and fractures from gear cutting root;
                              This is nonsense.

                              I never claimed that REM makes gears stronger. I am stating that your claim that REM causes them to break is in error.

                              Originally posted by Wanganstyle View Post
                              Run a cooler if you want less temps
                              Coolers (and pumps, since BMW's run independent) have weight. Fluid has weight. Fluid has viscous drag. Polishing has neither weight nor drag.

                              Is it racing or not? If it's not, run a cooler. If it is, save the weight and have the gears polished.

                              Comment


                                Deleted
                                Last edited by Wanganstyle; 09-09-2020, 04:09 PM.
                                OBD1 M54/M52TU swap as a M50b25

                                Z4 non powered steering rack fits e30



                                Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                                Comment

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