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Thread: Building MX5 Time Attack Cars

  1. #1
    Registered User lightyear's Avatar
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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.

    Attachment 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
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

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    Registered User tinkerbell's Avatar
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    Resident Weevil evil_weevil's Avatar
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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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    works for me as the first few years of monthly pay was hookers and coke for the first week, then 3 weeks of jerking off and water...

  4. #4
    Moderator Cal's Avatar
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    Why are you retaining the BP motor?
    The most dangerous risk of all - the risk of spending your life not doing what you want, on the bet you can buy yourself the freedom to do it later. - Randy Komisar.

  5. #5
    Boosted Bubble Andy_W's Avatar
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    NA8 (Open) or NB8B SE (in Clubsprint)?

    Cheers & good luck!

  6. #6
    Prod Sports Racer CT's Avatar
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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.

  7. #7
    SKYHI Motorsport TCR's Avatar
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    Looking forward to seeing how these progress.
    2015 Skoda Octavia RS162TSI
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  8. #8
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  9. #9
    Jak Sie Masz! trent from punchy's Avatar
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  10. #10
    New Zealand bro Dave's Avatar
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    why go to all this effort then keep the pissy little 1.6?
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  11. #11
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  12. #12
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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.

  13. #13
    Registered User lightyear's Avatar
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    That's why we are doing full aero. And running decent tyres.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  14. #14
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    I meant keeping a diff and gearbox in it.

  15. #15
    Minister for Sport Sport4's Avatar
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    Awesome work. Though ED MA61s 2UZ would rip in this.
    Good one dickhead

  16. #16
    Registered User lightyear's Avatar
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    With less weight there should be less stress on the driveline.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  17. #17
    Loving teh titties.. carcrazy's Avatar
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    Interesting projects cant wait to see how it goes
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  18. #18
    BIG MEK buzz's Avatar
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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?
    Fortitudo et Superbiam

  19. #19
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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?

  20. #20
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  21. #21
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  22. #22
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    You should start a thread on that too, or throw some pics up in this thread?

  23. #23
    Peoples Champ Fatboy's Avatar
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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....

  24. #24
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  25. #25
    Registered User lightyear's Avatar
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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.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  26. #26
    Peoples Champ Fatboy's Avatar
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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 !

  27. #27
    Registered User lightyear's Avatar
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    I think they should be competitive. It's all about weight.
    NA8B 89KW- P.I. 1:50.1, WNTN1:38.0, SDWN 1:27.6, WKFLD 1:10.4
    NB8B 181KW- P.I 1:43.8, WNTN 1:32.9, SDWN 1:22.0, BDFD 1:05.3
    VP 293KW- P.I 1:43.8 WNTN 1:33.5

  28. #28
    HoonTV RotaUte's Avatar
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    Quote Originally Posted by tinkerbell View Post
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  29. #29
    Registered User adamRSLC's Avatar
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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 1.47.95
    Winton 1.33.30
    H/Hills hill climb 1.03.3(FG XR6T)
    Bathurst 2.47.49

  30. #30
    Registered User SPEEDCORE's Avatar
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    Nice work on the doors!

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