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Thread: Building MX5 Time Attack Cars

  1. 03-06-10, 01:30 PM #1
    lightyear
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    Carbon Fibre Time Attack MX5 Turbo Build

    Hi guys, i am starting the build of two lightwieght turbo mx5's with a friend.
    I will keep you posted, feel free to comment on the build. I know there are a couple of mx5 racers on here that will no doubt have a lot more knowledge than myself on these cars. They are not being built to suit a racing class other than superlap. We really wanted to see how fast we can make the little cars go around a curcuit, without going to tube frame. We are removing a lot of weight by removing unwanted metal, and making all panels from carbon fibre. The panels will be redesigned with downforce/aero in mind. We will have full ground effects too. At first we will be reusing the nb 1.8 motors with turbo aprox 180rwkw's. And would like the weight down to around 750kg's.

    Click image for larger version.  Name: ricks car.JPG  Views: 94  Size: 85.9 KB  ID: 41697
    We cut about 15 kg's out of it last night.

    Our goal is a 1:40 around the island.
    Last edited by lightyear; 23-08-10 at 08:05 AM. Reason: update
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  2. 03-06-10, 02:09 PM #2
    tinkerbell
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  3. 03-06-10, 02:38 PM #3
    evil_weevil
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    I like your current car, so this will be a good thread to watch!!

    have you sold the NA6 yet?
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  4. 03-06-10, 03:01 PM #4
    Cal
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    Why are you retaining the BP motor?
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  5. 03-06-10, 03:34 PM #5
    Andy_W
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    NA8 (Open) or NB8B SE (in Clubsprint)?

    Cheers & good luck!
    Adaptronic Engine Management
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  6. 03-06-10, 03:48 PM #6
    CT
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    If you are making carbon panels and it's an NB, I am interested to see what you do.
    A slow day at the track is better than any day in the office.
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  7. 03-06-10, 05:01 PM #7
    TCR
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    Looking forward to seeing how these progress.
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  8. 03-06-10, 05:34 PM #8
    lightyear
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    I didn't sell the NA, and i am not going to. If i sold it i would have nothing to drive till the NB is done.
    We are keeping the standard motor for now, we can always upgrade later. A few people have said 13b turbo. We want to keep the ppf too. If we decide to change the engine later we will make tube subframes to save weight and to suit the new engine.
    I would say we will be in open class.
    I just want to get them built and them develop them as we get to know what they need.
    Last edited by lightyear; 03-06-10 at 05:37 PM.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  9. 03-06-10, 06:01 PM #9
    trent from punchy
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  10. 03-06-10, 06:03 PM #10
    BoganDAVE
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    why go to all this effort then keep the pissy little 1.6?
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  11. 03-06-10, 06:29 PM #11
    lightyear
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    It's actually a 1.8. They will be fast enough with the stock motors. My current NA has more weight, less power and less aero.... and beats a shitload of cars. I will be going down to phillip island in the beginning of july with the old NA and i bet it will do a 1:47. Not too many cars going that fast. Once we have saved enough money we will put some decent power in the cars.
    If we get any help/sponsors along the way, we will have them more developed earlier.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  12. 03-06-10, 06:33 PM #12
    The Pupat
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    You can make the grunt from a BP. Putting it to the ground is normally the drawback.
    Sounds like a good project I shall be watching in anticipation.
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  13. 03-06-10, 08:09 PM #13
    lightyear
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    That's why we are doing full aero. And running decent tyres.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  14. 03-06-10, 09:20 PM #14
    The Pupat
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    I meant keeping a diff and gearbox in it.
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  15. 03-06-10, 09:21 PM #15
    Sport4
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    Awesome work. Though ED MA61s 2UZ would rip in this.
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  16. 04-06-10, 10:31 AM #16
    lightyear
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    With less weight there should be less stress on the driveline.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  17. 04-06-10, 12:11 PM #17
    carcrazy
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    Interesting projects cant wait to see how it goes
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  18. 04-06-10, 12:24 PM #18
    buzz
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    Inon Juan.

    Very cool. Do you have any requirement for pansy 'street' stuff like operating headlights, indicators, horns, etc? Or is it an outright exercise in minimalism?
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  19. 04-06-10, 12:32 PM #19
    flopper
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    Quote Originally Posted by lightyear View Post
    I didn't sell the NA, and i am not going to. If i sold it i would have nothing to drive till the NB is done.
    We are keeping the standard motor for now, we can always upgrade later. A few people have said 13b turbo. We want to keep the ppf too. If we decide to change the engine later we will make tube subframes to save weight and to suit the new engine.
    I would say we will be in open class.
    I just want to get them built and them develop them as we get to know what they need.
    I've always thought an IPRA style 13B and dog box would be great in an MX5. Good power, not too heavy and pretty well proven in a race car.

    I'm surprised there aren't a few more over the top MX5s around seeing as they do so well even with only mild mods. I guess not having somewhere to race them becomes an issue?

    What made you choose NB over NA?

    Who's car is that in your avatar?
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  20. 04-06-10, 02:16 PM #20
    lightyear
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    Quote Originally Posted by buzz View Post
    Inon Juan.

    Very cool. Do you have any requirement for pansy 'street' stuff like operating headlights, indicators, horns, etc? Or is it an outright exercise in minimalism?
    No pansy street stuff here.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  21. 04-06-10, 02:58 PM #21
    lightyear
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    The car in the avatar is my cuurent track car. The NB is a lighter car and makes a better racecar.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  22. 04-06-10, 04:21 PM #22
    flopper
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    You should start a thread on that too, or throw some pics up in this thread?
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  23. 04-06-10, 06:07 PM #23
    FatBoy
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    Quote Originally Posted by flopper View Post
    I've always thought an IPRA style 13B and dog box would be great in an MX5. Good power, not too heavy and pretty well proven in a race car.
    I'd just build a decent IPRA RX-7 (950kgs) then throw a turbo 13b at it. Run better rubber (wouldn't be hard, they are limited to 225/50/15 Yoko's), and it'd be a weapon...

    A genuine 250rwhp IPRA RX-7 that has a decent steerer will do 1.43's at Eastern Creek - imagine the same car a little bit lighter, with better rubber and 450rwhp...

    The shorter wheelbase of the MX-5 would scare me with mega hp....
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  24. 04-06-10, 07:32 PM #24
    lightyear
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    Here are some pics for ya........

    A pic from sandown, last corner at the end of the back straight.




    I made some carbon fibre doors, they weigh a bit over 2kg's for the complete shell inner and outer.







    And a c.f hardtop




    1.6 motor with headwork, hks cam and tdo4h turbo running microtech. And V-mount.



    Interior pic, not much in here.



    Uploaded with ImageShack.us
    Last edited by lightyear; 04-06-10 at 07:37 PM.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  25. 04-06-10, 07:41 PM #25
    lightyear
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    A genuine 250rwhp IPRA RX-7 that has a decent steerer will do 1.43's at Eastern Creek - imagine the same car a little bit lighter, with better rubber and 450rwhp...

    The shorter wheelbase of the MX-5 would scare me with mega hp.... [/QUOTE]

    We want to use mx5's, i think everyone has done rx7's to death. I like them, but we don't want to go that way.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  26. 05-06-10, 04:45 PM #26
    FatBoy
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    Fair enough - i just figured for Superlap type events they'd be a good option...

    Enjoy, look forward to seeing how you go !
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  27. 06-06-10, 08:19 AM #27
    lightyear
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    I think they should be competitive. It's all about weight.
    The old banger mx5 - Phillip Island - 1:50.6 (with 125rwkw's no lsd) Sandown - 1:24.7 (with 110rwkw's and lsd) Winton - 1:36.8 (with 125rwkw' and lsd)
    The NA8B 89.3rwkw's - P.I. 1:52.8 -WINTON 1:38.0 - SANDOWN 1:28.8 -WINTON SHORT 1:08.7 -BROADFORD 1:07.9
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  28. 06-06-10, 05:47 PM #28
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  29. 06-06-10, 07:38 PM #29
    adamRSLC
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    [QUOTE=lightyear;840759832]Here are some pics for ya........

    A pic from sandown, last corner at the end of the back straight.




    Im not sure on the car but didnt you put this into the wall ( lightly ) at a wrx club event at sandown last year ? , sorry if its the wrong car / driver .

    adam
    Sandown 1.23.31
    Calder 1.05.76
    Phillip Island 1.51.50
    Winton 1.37.20
    H/Hills hill climb 1.03.3(FG XR6T)
    Bathurst 2.47.49
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  30. 06-06-10, 07:52 PM #30
    SPEEDCORE
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    Nice work on the doors!
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