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    Miata LSD

    I've read about the BG rear diff upgrade to 90-93 Miata LSD, but is it a direct swap? Do I have to do anything special to make it work, or just put it on?
    1990 Protege 4WD
    GT-X BP26 swap [AT->MT]|Cup holder cut to fit|Synthetic gear oil|Synthetic brake fluid|Corksport SS brake/clutch lines|Mazdaspeed HV oil pump|GT-X front STB|Corksport type I rear STB|Matching full-size spare wheel|Homebrew Brass shifter bushing|Speed Source brass shifter cable bushings|EDM headlights/corners|FMIC|EDM cabin vents

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    Seeking: Canadian 4WD seatbelts.


    #2
    Do you have the whole thing or just the guts? My streetcar came with the guts from a miata lsd, and they would have bolted right into the stock prot housing with no mods (but I put my old factory plate diff back there instead). But I don't know about any potential fitment issues invoved with the whole schmear.
    '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
    '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
    http://www.wihandyman.com/forum/vbpi...?do=view&g=110
    http://www.cardomain.com/ride/2599486

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      #3
      i was told that the diff case is different externally, the mounting points are all different. you have to swap the internals.

      -jon
      Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
      ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
      Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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        #4
        Do you have the whole thing or just the guts?
        All I have now is the stock open 4WD rear diff. I'm asking because I want to have a rear LSD later, not right now. I need to know how expensive/difficult it is to do the Miata rear, or if it would be better to look for a GTR

        Seems like a matter of swapping Miata internals into my housing?
        1990 Protege 4WD
        GT-X BP26 swap [AT->MT]|Cup holder cut to fit|Synthetic gear oil|Synthetic brake fluid|Corksport SS brake/clutch lines|Mazdaspeed HV oil pump|GT-X front STB|Corksport type I rear STB|Matching full-size spare wheel|Homebrew Brass shifter bushing|Speed Source brass shifter cable bushings|EDM headlights/corners|FMIC|EDM cabin vents

        1 3 5
        ├┼┤
        2 4 R


        Seeking: Canadian 4WD seatbelts.

        Comment


          #5
          yeah, just swap the internals. Good luck finding a gtr rearend. Try to get as low-mileage miata rearend as you can, they are not known for keeping thier limited-slip qualities for a real long time.
          '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
          '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
          http://www.wihandyman.com/forum/vbpi...?do=view&g=110
          http://www.cardomain.com/ride/2599486

          Comment


            #6
            Thats what I did to my 4wd pro is just swap in the miata LSD unit into the rear diff.. The nice thing is the plates are still avail for rebuilds, and throw a .010" shim in there to get a little more grab... Old trick from my days as a maz tech with 1st gen rx7's... No need to search for a GTR rear diff...

            Comment


              #7
              Corksport has a used GTR rear diff for $350.


              Is the Miata viscous or clutch type?
              1990 Protege 4WD
              GT-X BP26 swap [AT->MT]|Cup holder cut to fit|Synthetic gear oil|Synthetic brake fluid|Corksport SS brake/clutch lines|Mazdaspeed HV oil pump|GT-X front STB|Corksport type I rear STB|Matching full-size spare wheel|Homebrew Brass shifter bushing|Speed Source brass shifter cable bushings|EDM headlights/corners|FMIC|EDM cabin vents

              1 3 5
              ├┼┤
              2 4 R


              Seeking: Canadian 4WD seatbelts.

              Comment


                #8
                Originally posted by me109 View Post
                Corksport has a used GTR rear diff for $350.


                Is the Miata viscous or clutch type?
                Stay away from those... that is the viscous type and is prone to fail. You would be happier with the plate type from a miata.

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                  #9
                  Well i was at work one day and got bored and looked up the case number for my gtx and a miata without LSD they are the same. However miata with LSD is a diffrent case number. However for some reason i dont think that the mounting would be diffrent from LSD to non lsd diffs. could be wrong thou

                  Comment


                    #10
                    Its swaps straght over. i put a miata LSD into my Pro Rear diff on the MX3. they are the same. the week little buggers.
                    Josh
                    95' AWD MX-3 RST - Still a work in progress
                    05' MS RX-8 - Needing some love in the form of a new motor, soon to be FE3 powered
                    Work Log - http://www.wihandyman.com/forum/showthread.php?t=53776
                    Cardomain Page - http://www.cardomain.com/ride/408020
                    Face Book page http://www.facebook.com/pages/Mazda-...37983472959216

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                      #11
                      Ok, I'm now ressurrecting this thread (it's not THAT old, only a year and 8 months...)

                      I'm starting to look into this a bit for the car I'll be picking up in a couple weeks. I've not really run across mention of any 90-93 Miata diffs that haven't been either the Viscous type or an open type. I'm starting to dig around on miata.net, but does anyone have any other resources to start looking at?

                      Thanks,

                      --sarge

                      Comment


                        #12
                        the 90-93 diffes are the smaller ones that splode, so even if they fit i dont think its worth it
                        "Discontent is the first necessity of progress."
                        -Thomas A. Edison

                        "There is a fine line between ballin' on a budget, and dreamin' on an empty wallet."


                        *Junked* 92 mx3, BP swap- milage whore, beaten up and down the east coast
                        *Junked* KLZE powered 323 on Megasquirt 1
                        172.60HP & 156.93 TQ with only headers and short ram intake. back under the knife for a BPT swap.
                        New Daily stock 1.6L 1999 Mazda Protege LX

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                          #13
                          The miata can even take an RX-7 diff from what I heard. Something to check out.

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                            #14
                            Or just drop 500 on a new lsd that'll last the life time of the vehicle.

                            No thats too simple.
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                              #15
                              Using the larger diff requires a different housing also. To do the change on a miata requires you get a new driveshaft (pinion length is longer) and axles (two-piece, rather than 1-piece.)

                              I don't think the housing from a miata will bolt up to the BP rear crossmember without some serious modding, and I don't know yet if the splines would be the same on the hub side as for the miata side of things, or if the proper-splined hub could be pressed into the BP knuckle without some machining or deep digging to find a bearing that fits.

                              I suppose there's always the option of a Lincoln Locker, but I plan on maybe using the car as a DD in the winter, and that would kinda suck.

                              I was talking to a friend yesterday, and he was reading somewhere that one of the teams that used to race with viscous diffs (I'm not sure if it was miatas or something else) used to drain all of the fluid from the viscous diffs, and instead of the oem silicone fluid, used the same silicone filler that is used in breast implants. Apparently, it did it's job VERY well.

                              Plus, you could have a sticker on the car, "Powered by Boobies"...

                              --sarge

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