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Thread: rx8 r/p on 86-88 rx7 lsd

  1. #1
    Join Date
    Jan 2005
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    Alachua, Florida
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    261

    Default rx8 r/p on 86-88 rx7 lsd

    So I get the 86-88 rx7 non turbo lsd to install in the miata case. After reading on several websites that the rx8 4.44 r/p is tha same and will fit I go buy one. Well it doesn't. The 4.44 is too big and I'm wondering did I get the wrong info or the seller of the r/p give me the wrong parts. This is just one of the links to the info I was going by http://www.turbomagazine.com/tech/08...ech/index.html Can anyone confirm or deny that the rx 8 r/p fits the lsd from the 86-88 na rx7 and 94-97 miata like I've been told.
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

  2. #2
    Join Date
    Oct 2004
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    Asheville, NC US
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    Default

    No, it does not. The ring gear is the same size as the 86-91 Turbo 2 RX7 but the pinion is shorter. Limited slip from 86-91 NA RX7 will fit the 1800 Miata rear end.
    Steve Eckerich
    ITS 18 Speedsource RX7
    ITR RX8 (under construction)

  3. #3
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    Default

    Thanks Steve. I guess it's always advisable to seek the advice of an expert before you believe something on the internet. I guess if I buy a boat I have an anchor
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

  4. #4
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    Default

    Quote Originally Posted by seckerich View Post
    Limited slip from 86-91 NA RX7 will fit the 1800 Miata rear end.
    86-88 is the clutch type and 89-91 is a torsen right?
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

  5. #5
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    Asheville, NC US
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    Default

    All of them are clutch type. I heard they put the Torsen in some of the 91 cars but never actually saw one. The Torsen we use in the ITS cars is actually a Miata unit. I think I have one on a shelf somewhere. Keep in mind that the ring and pinion from a first gen RX7 fits the 1800 Miata case. Off the shelf gears are 4.88, 5.12, and very hard to find 4.6 and 4.44 that were old RX3 gears.
    Steve Eckerich
    ITS 18 Speedsource RX7
    ITR RX8 (under construction)

  6. #6
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    Jan 2005
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    Alachua, Florida
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    Thanks again Steve. mazdaspeed motorsports shows a 4.44 for the miata @ $480. I don't know if they still carry the gears but I was able to put it in my shoppingcart.
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

  7. #7
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    Oct 2004
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    Northeast
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    Quote Originally Posted by pitbull113 View Post
    Thanks again Steve. mazdaspeed motorsports shows a 4.44 for the miata @ $480. I don't know if they still carry the gears but I was able to put it in my shoppingcart.
    I think I bought the last one in July.
    Andy Bettencourt
    New England Region 188967

  8. #8
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    Jan 2005
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    Quote Originally Posted by Andy Bettencourt View Post
    I think I bought the last one in July.
    :eek:
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

  9. #9
    Join Date
    Jan 2001
    Location
    Floyds Knobs, IN
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    1,093

    Default

    Quote Originally Posted by pitbull113 View Post
    86-88 is the clutch type and 89-91 is a torsen right?

    86-88 is clutch type. 89-91 is viscous. There were also open diffs is quite a few of them so you're no guaranteed an LSD if you buy one.
    Chris Ludwig
    GL Lakes Div
    www.ludwigmotorsports.com

  10. #10
    Join Date
    Jan 2005
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    Quote Originally Posted by C. Ludwig View Post
    86-88 is clutch type. 89-91 is viscous. There were also open diffs is quite a few of them so you're no guaranteed an LSD if you buy one.
    yeah i found that out the hard way.
    Steve Elicati
    ITA 1994 Mazda Miata
    Central Florida Region

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