Page 1 of 2 12 LastLast
Results 1 to 15 of 16

Thread: HKS Miata Transmission

  1. #1
    Supporting Member fwdtamiya's Avatar
    Drives
    1991 BRG
    Location
    USA
    Join Date
    Dec 2011
    Posts
    8,365
    Thanks Given
    3,878
    Thanked 3,435 Times in 1,506 Posts

    HKS Miata Transmission

    Here's a bit of an interesting historical thing I came across recently. An HKS cross trans that bolts up to the miata transmission housing. Google-fu says it's a 3 speed. Though what I had been told long ago is that a cross trans means 3 gears are replaced with shorter ratio ones. To me this never made any sort of logical sense about not replacing all the gears, while the transmission was in pieces anyway, so that ratio differences between 3 and 4 for instance weren't a mess, or why the final drive wasn't just changed instead, which would be a much cheaper and faster method. I'm beginning to think "cross" is just engrish for "close." So I'm not quite sure if this is actually a 5 speed or a 3 speed. Anyone have knowledge about that? Here are the pics:


    メーカー:HKS関西
    商品名:HKS関西 3速クロスミッション
    マツダ NA6 ロードスター用

    https://page.auctions.yahoo.co.jp/jp/auction/j570655341












  2. The Following 4 Users Say Thank You to fwdtamiya For This Useful Post:

    Greasemonkey2000 (06-15-2019),Ihatecars (05-27-2020),MaRcOp01o (06-12-2019),tsingson (06-13-2019)

  3. #2
    5,000 rpm - there be torque here! MaRcOp01o's Avatar
    Drives
    93 EUNOS and 93 LE
    Location
    Miami,Fl
    Join Date
    Jul 2017
    Posts
    2,862
    Thanks Given
    1,716
    Thanked 1,393 Times in 567 Posts
    Well holy hell I didn’t know this was a thing! But in my Eunos I have the mazdaspeed close ratio gearing in my trans and man it seriously makes the miata a whole different animal.
    Follow the Builds
    1993 Eunos Roadster B-spec by Mazdaspeed
    http://mazdaroadster.net/showthread....819#post222819
    1993 Mazda Miata LE
    https://mazdaroadster.net/showthread...233#post244233

  4. #3
    3,000 rpm - starting to feel the power bogaut's Avatar
    Drives
    Mazda Familia
    Location
    Portland, OR
    Join Date
    Jun 2013
    Posts
    542
    Thanks Given
    2
    Thanked 408 Times in 216 Posts
    yea i think its just close ratio 1-3

  5. #4
    2,000 rpm - light wheelspin, no bog here!
    Drives
    94 Laguna/Tan
    Location
    Playa del Rey, CA
    Join Date
    Feb 2015
    Posts
    180
    Thanks Given
    8
    Thanked 59 Times in 36 Posts
    Quote Originally Posted by MaRcOp01o View Post
    Well holy hell I didn’t know this was a thing! But in my Eunos I have the mazdaspeed close ratio gearing in my trans and man it seriously makes the miata a whole different animal.
    For the better I assume? I always had an eye out for that MS set. Do you have the MS final drive gear too?

    Sent from my VS996 using Tapatalk
    '94 M-Edition - Stock - SOLD
    '94 Laguna/Tan - Stock [currently being restored]

  6. #5
    5,000 rpm - there be torque here! MaRcOp01o's Avatar
    Drives
    93 EUNOS and 93 LE
    Location
    Miami,Fl
    Join Date
    Jul 2017
    Posts
    2,862
    Thanks Given
    1,716
    Thanked 1,393 Times in 567 Posts
    Quote Originally Posted by NotableGuest View Post
    For the better I assume? I always had an eye out for that MS set. Do you have the MS final drive gear too?

    Sent from my VS996 using Tapatalk
    Yep It’s the whole shibang. Makes a nice transmission whine too and the gearing is spectacular I can’t stress that enough you feel like a race car flying through 3rd 4th and 5th.
    Follow the Builds
    1993 Eunos Roadster B-spec by Mazdaspeed
    http://mazdaroadster.net/showthread....819#post222819
    1993 Mazda Miata LE
    https://mazdaroadster.net/showthread...233#post244233

  7. The Following User Says Thank You to MaRcOp01o For This Useful Post:

    tsingson (06-14-2019)

  8. #6
    Ninja Messiah kung fu jesus's Avatar
    Drives
    1999 White
    Location
    Atlanta, GA
    Join Date
    Dec 2011
    Posts
    15,852
    Thanks Given
    2,791
    Thanked 7,202 Times in 3,433 Posts
    Quote Originally Posted by MaRcOp01o View Post
    Yep It’s the whole shibang. Makes a nice transmission whine too and the gearing is spectacular I can’t stress that enough you feel like a race car flying through 3rd 4th and 5th.
    Is that a dog box with straight cut gears like this Quaife sequential?

    https://youtu.be/Nn02RwrNIzI

  9. #7
    5,000 rpm - there be torque here! MaRcOp01o's Avatar
    Drives
    93 EUNOS and 93 LE
    Location
    Miami,Fl
    Join Date
    Jul 2017
    Posts
    2,862
    Thanks Given
    1,716
    Thanked 1,393 Times in 567 Posts
    Quote Originally Posted by kung fu jesus View Post
    Is that a dog box with straight cut gears like this Quaife sequential?

    https://youtu.be/Nn02RwrNIzI
    The one in the Eunos is a regular 5-Speed but has polished gears and shorter 3-4-5 gear ratio. The shifts are very smooth and direct
    Follow the Builds
    1993 Eunos Roadster B-spec by Mazdaspeed
    http://mazdaroadster.net/showthread....819#post222819
    1993 Mazda Miata LE
    https://mazdaroadster.net/showthread...233#post244233

  10. The Following User Says Thank You to MaRcOp01o For This Useful Post:

    fwdtamiya (06-15-2019)

  11. #8
    Ninja Messiah kung fu jesus's Avatar
    Drives
    1999 White
    Location
    Atlanta, GA
    Join Date
    Dec 2011
    Posts
    15,852
    Thanks Given
    2,791
    Thanked 7,202 Times in 3,433 Posts

    HKS Miata Transmission

    Neat.

    There is a shop near me that rebuilds Miata boxes. Some of the local guys running V6 swaps, bigger turbo/power Miatas are using their boxes and have nothing but great things to say. I believe they have 2 or 3 levels of builds, but their pricing is actually pretty good for an OE upgrade.

    https://walter-motorsports.com/

    They near Road Atlanta.

    Quaife sells close-ratio gear sets, or used to IIRC.

  12. The Following 2 Users Say Thank You to kung fu jesus For This Useful Post:

    fwdtamiya (06-16-2019),Greasemonkey2000 (06-15-2019)

  13. #9
    5,000 rpm - there be torque here! MaRcOp01o's Avatar
    Drives
    93 EUNOS and 93 LE
    Location
    Miami,Fl
    Join Date
    Jul 2017
    Posts
    2,862
    Thanks Given
    1,716
    Thanked 1,393 Times in 567 Posts
    Quote Originally Posted by kung fu jesus View Post
    Neat.

    There is a shop near me that rebuilds Miata boxes. Some of the local guys running V6 swaps, bigger turbo/power Miatas are using their boxes and have nothing but great things to say. I believe they have 2 or 3 levels of builds, but their pricing is actually pretty good for an OE upgrade.

    https://walter-motorsports.com/

    They near Road Atlanta.

    Quaife sells close-ratio gear sets, or used to IIRC.
    Dam that’s pretty sick! I do know you can swap in the NCs gearing while using the NA/NB housing.
    Follow the Builds
    1993 Eunos Roadster B-spec by Mazdaspeed
    http://mazdaroadster.net/showthread....819#post222819
    1993 Mazda Miata LE
    https://mazdaroadster.net/showthread...233#post244233

  14. #10
    2,000 rpm - light wheelspin, no bog here! lifebyevan's Avatar
    Drives
    Mahogony Mica '00 Special Edition NB1
    Location
    Orlando, FL
    Join Date
    Feb 2020
    Posts
    104
    Thanks Given
    36
    Thanked 128 Times in 40 Posts
    Quote Originally Posted by MaRcOp01o View Post
    Dam that’s pretty sick! I do know you can swap in the NCs gearing while using the NA/NB housing.
    What is the benefit of the NC gears, do you know? Never heard of putting the NC gearing in the NA?NB housing but I'm interested to know more.

  15. #11
    Ninja Messiah kung fu jesus's Avatar
    Drives
    1999 White
    Location
    Atlanta, GA
    Join Date
    Dec 2011
    Posts
    15,852
    Thanks Given
    2,791
    Thanked 7,202 Times in 3,433 Posts
    I don't know that anyone has done that, but I do remember the physical dimensions of the gear sets are similar.

  16. #12
    5,000 rpm - there be torque here! MaRcOp01o's Avatar
    Drives
    93 EUNOS and 93 LE
    Location
    Miami,Fl
    Join Date
    Jul 2017
    Posts
    2,862
    Thanks Given
    1,716
    Thanked 1,393 Times in 567 Posts
    Quote Originally Posted by evan1006 View Post
    What is the benefit of the NC gears, do you know? Never heard of putting the NC gearing in the NA?NB housing but I'm interested to know more.
    I was told by an SCCA Gentleman that he was running in his NB his NB rear housing cone and the bell housing from the NB but he had the NC 5-Speed gear set.

    At the time I was 17 years old and only had my miata for a month so hearing that sounded crazy cool but I never looked into it at the time.
    Follow the Builds
    1993 Eunos Roadster B-spec by Mazdaspeed
    http://mazdaroadster.net/showthread....819#post222819
    1993 Mazda Miata LE
    https://mazdaroadster.net/showthread...233#post244233

  17. #13
    Ninja Messiah kung fu jesus's Avatar
    Drives
    1999 White
    Location
    Atlanta, GA
    Join Date
    Dec 2011
    Posts
    15,852
    Thanks Given
    2,791
    Thanked 7,202 Times in 3,433 Posts
    Yeah. If it were easy or common, there would be a ton of them out there. $1200 for an improved rebuilt unit (local-ish to me) is the "easy" button.

  18. The Following User Says Thank You to kung fu jesus For This Useful Post:

    MaRcOp01o (05-27-2020)

  19. #14
    6,000 rpm - mere mortals would shift HarryB's Avatar
    Drives
    '04 Strato Blue NB2
    Location
    Greece
    Join Date
    Jun 2015
    Posts
    5,933
    Thanks Given
    6,670
    Thanked 2,273 Times in 1,330 Posts
    This has been discussed again AFAIK

    https://mazdaroadster.net/showthread...ssion-in-NA-NB

    Not sure if do-able or not, but what would the benefit be? I doubt the NC 5-speeds are any stronger.

  20. #15
    2,000 rpm - light wheelspin, no bog here! lifebyevan's Avatar
    Drives
    Mahogony Mica '00 Special Edition NB1
    Location
    Orlando, FL
    Join Date
    Feb 2020
    Posts
    104
    Thanks Given
    36
    Thanked 128 Times in 40 Posts
    Quote Originally Posted by HarryB View Post
    This has been discussed again AFAIK

    https://mazdaroadster.net/showthread...ssion-in-NA-NB

    Not sure if do-able or not, but what would the benefit be? I doubt the NC 5-speeds are any stronger.
    Here is the info from the Nielex website, in case the website link goes bad in the future:

    "NCEC 5-speed mission SWAP (for NA / NB)
    revised edition

    200,000- + tax (as of February 2018) The cost of desorption is not included.
    Vehicle type: NA6CE / NA8C / NB6C / NB8C

    Roadster 5-speed MT has been equipped with the same model for three consecutive generations from NA6CE to NCEC.
    However, its contents continued to be improved to meet the quality required by the changes of the times, and it made great progress.
    When the model was changed from the NA type to the NB type, double-cone sync for the 1st and 2nd speed was adopted, and the gear change to the 2nd speed, which was awkward with the NA type, was smoothed.
    In NCEC 5th speed, further ripening of shift feel and in response to high torque associated with 2L engine, triple cone sync to 1st to 2nd speed, double cone sync to 3rd speed, carbon synchronization to 4th speed In addition to the adoption, improvements such as low friction in the shift operation system have reduced the feeling of roughness of the metal system that is transmitted to the palm of the hand, and realized a nice shift operation.
    As a recent trend, the NA type has a strong need to replace missions that have overused 200,000 km, and the reality is that overhauls of handheld missions, replacement of used missions of the NB6C, or replacement of the NB8C 6-speed MT are being dealt with.
    Nevertheless, the NB8C 6-speed MT is also a bottleneck for long-term ownership because it is difficult to obtain new ones.
    In particular, the 6-speed MT of the NB8C was not highly evaluated from the beginning due to the shift feel and gear ratio.
    Since 1st gear is super low, you have to shift up to 2nd gear immediately after starting, and to be honest, it will be difficult to start and you will start to rotate at 2nd gear.
    In addition, the 6th speed, which is overtop, has no torque like the shift for fuel-saving cruises on highways, and is not easy to use.
    Nirex has already established a menu for diverting new NCEC 5-speed MT to NA6CE to NB8C 6-speed for 5 years, and has done many NCEC 5-speed MT SWAP constructions.
    We take pride in achieving the highest level of customer satisfaction.
    What is more noteworthy is the movement of the NB8C's NCEC 5-speed MT, which should be called a breakup to the NB8C 6-speed MT .
    We already have several SWAP cases.
    Then what are the advantages of the NB8C's NCEC 5-speed MT?
    That is, when shifting up from first gear, it is possible to connect to the top gear smoothly and efficiently without removing the torque band.
    As a result, the torque band of each gear is wide, not busy, and long-lasting acceleration continues.
    Another point is that the NCEC 5-speed MT is a high torque compatible mission for 2L engines.
    It is the best choice not only for 1.8L NB8C but also for vehicles with high power tuned engine.
    It can be asserted that this NCEC 5-speed mission SWAP is the best menu for mission tuning up of NA6CE to NB8C.
    * 1
    NCEC 5-speed mission SWAP requires NA / NB6C 5-speed mission case.
    Especially in the case of NB8C, it is necessary to procure a used NB6C mission case in advance.
    Note 2) The
    diff / final value may need to be changed depending on the driving stage.
    Note 3) In
    addition to the above new menu, we also handle used NCEC 5-speed mission SWAP, but it is a prerequisite that you bring your used mission. Please contact us."

  21. The Following 2 Users Say Thank You to lifebyevan For This Useful Post:

    HarryB (05-30-2020),tsingson (05-29-2020)

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •