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Thread: Building MX5 Time Attack Cars

  1. #61
    Registered User lightyear's Avatar
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    I just had a look at your excell page. Very impressive. I would love to do something like that when i have more spare time. Should be exciting to drive. What would the total weight be??
    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 1:46.0 WNTN 1:33.5

  2. #62
    HoonTV RotaUte's Avatar
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    Quote Originally Posted by lightyear View Post
    Buy an NB, i will have all panels for it. I only have the doors for the NA model. You could use all the front NB panels on an NA though.
    Yeah that was suggested, but I agree with him in the fact that the NA is the real MX5.

    Kinda like if you want a GTR, sure R34s are newer (nobody wants an R33), but R32s will always be the real GTR

    IMO
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  3. #63
    Registered User lightyear's Avatar
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    I always thought that, but i think that's because i owned an NA. When they are on the track only a real mx5 enthusiast can tell them apart (NA to NB).
    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 1:46.0 WNTN 1:33.5

  4. #64
    Opens profi's Avatar
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    Quote Originally Posted by lightyear View Post
    I just had a look at your excell page. Very impressive. I would love to do something like that when i have more spare time. Should be exciting to drive. What would the total weight be??
    Car by its self should be somewhere around the 700kg mark. Is there any time attack classes it may be allowed to run in?

  5. #65
    Registered User lightyear's Avatar
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    Nah, but just rock up and say you thought they come out like that. Look forward to seeing it on a track day soon.
    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 1:46.0 WNTN 1:33.5

  6. #66
    Registered User hsvgts196's Avatar
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    Quote Originally Posted by RotaUte View Post
    That's pretty good. I suggested a mate shoot you a line, we're starting on a time attack MX5 later this year once he sells his other cars and getting you to take care of the panels/aero would save a huge amount of hassle.
    Yes you did ! Subscribed and looking forward to seeing the progress. Just need to sell the other 2 and I'll pick up the phone.

  7. #67
    Registered User lightyear's Avatar
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    Fark it's so much easier to push the cars after they are ripped apart. Pushed the car onto the hoist late this arvo, and took everything off it except the subfames/suspension, and pushed it back off.You can feel the difference. Pity we have to put a motor in it.

    I was thinking of taking the scales down and weighing all the crap. Then we can weigh what goes back on and get a fair idea of what it weighs when it's finished
    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 1:46.0 WNTN 1:33.5

  8. #68
    Registered User lightyear's Avatar
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    I am getting there with my car the other one was dropped of yesterday at meridian to get the cage done. This one will go down on wednesday.
    I weighed everything i took off too.
    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 1:46.0 WNTN 1:33.5

  9. #69
    Registered User lightyear's Avatar
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    I just worked it out, we took off 253 kg's not including motor/box and all accesories on motor, like a/c p/s brackets etc. I figured that the turbo gear would weigh similiar.

    Seats weigh 28.5 kg's for the pair - new seat 6kg's. The softtop with all accesories weighs 22.3kg's - carbon fibre roof 6kg's. The doors weigh 23.2 kg's each without the doortrim and handle - c.f doors about 3.5 kg's with window. Dash assembly with support is 16.5kg's not inc heater, a/c and blower. The complete carpet and soundproofing is 11kg's, loom 12.5kg's, alloy bonnet 8.1kg's, exhaust cat back 18.2kg's, and we have a bucket of bolts that weighs 8.2kg's.

    We will be putting roughly 70 kg's back into it by my calculations. Also cutting out about 20-30kg's of metal. Plus the cage about 50kg's. That means the cars will weigh under 900 kg's finished if the weight is 1060kg's for a factory car. Not sure but i think that's what they weigh. I am sure we will find more weight to take out before they are finished. I think the most we are going to save is about 300kg's over a standard car. I am hoping for around 800kg's or less.
    Last edited by lightyear; 10-06-10 at 11:41 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 1:46.0 WNTN 1:33.5

  10. #70
    Registered User lightyear's Avatar
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    The car weighs 1026 from factory. I reworked out the numbers. It would be minimum 260kg's of stuff that has come off that won't be needed. Replacing that with about 60-65kg's of new stuff. Plus cage 40-50kg's Minus metal removed 20-30kg's. should weigh between 836kg's and 861kg's finished. We will see at the end how close i get. It is not so easy getting them under 800kg's. I will be looking into making a jig to replicate the subframes in tubular steel as well as all the suspension arms. That should save another 20+kg's.
    Last edited by lightyear; 11-06-10 at 09:38 AM.
    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 1:46.0 WNTN 1:33.5

  11. #71
    Registered User stb's Avatar
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    That's nice and light. Should go alright...

  12. #72
    Registered User lightyear's Avatar
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    Does anyone know of a place to acid dip the cars in melbourne?
    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 1:46.0 WNTN 1:33.5

  13. #73
    Opens HoonBoy's Avatar
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    Quote Originally Posted by lightyear View Post
    I will be looking into making a jig to replicate the subframes in tubular steel as well as all the suspension arms. That should save another 20+kg's.
    I think that's a bit optomistic, I've got an MX5 subframe with arms and hubs (no diff, driveshafts, brakes) sitting in the garage and I can't see where you would save 20kg on it. I haven't got anything I can use to weigh it, but I guess it weighs about 40kg or less.

  14. #74
    Registered User lightyear's Avatar
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    I was thinking 10kg for the front and 10kg for the rear. Look up the v8 miata subframes, i am sure they save a bunch of weight.There is about a 7kg saving with after market brakes. Got me new wheels today from the mx5centre.



    They are 15x9's with 225's. And weigh less than half a kilo more than the stock wheels and tyres.

    Edit: just looked it up the tube subframes are 10lb lighter than stock, and there would be a few kilo's in each suspension arm, especially if you do away with the big bushes and use rose joints.
    Last edited by lightyear; 12-06-10 at 07:03 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 1:46.0 WNTN 1:33.5

  15. #75
    \/ \/ My motivation \/ \/ ALLMTR's Avatar
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    The V8 subframes (that I have seen) look piss weak compared to the standard fare
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  16. #76
    Opens HoonBoy's Avatar
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    10kg would be a bit more realistic (although maybe hard to get all the way there). I'm deciding if I should chuck the subframe and just build the chassis with the suspension arm pickup points. It should be lighter, potentially stiffer and easier to do in my case.

  17. #77
    Registered User lightyear's Avatar
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    We won't be doing it straight away. After the cars are going we will be doing more things like this. Let me know how you go with it, sounds interesting.
    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 1:46.0 WNTN 1:33.5

  18. #78
    Clubman CXTdreamer's Avatar
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    I guess you're not going to be doing NA front guards now that you've moved on to the NBs?

    Looks like these two will be balltearers
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  19. #79
    Registered User lightyear's Avatar
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    I had started moulding 1 NA guard, but didn't finish it due to being too busy. So i won't be doing them yet. The standard guards are not that heavy anyway. If you didn't eat mcdonalds for a couple of weeks it would work out to be the same weight saving.
    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 1:46.0 WNTN 1:33.5

  20. #80
    Moderator Cal's Avatar
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    Are they the nickel version of the 949 wheels?
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  21. #81
    Registered User 260BC's Avatar
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    Quote Originally Posted by HoonBoy View Post
    10kg would be a bit more realistic (although maybe hard to get all the way there). I'm deciding if I should chuck the subframe and just build the chassis with the suspension arm pickup points. It should be lighter, potentially stiffer and easier to do in my case.
    Thats an idea, going to build in some adjustability eg anti/pro squat?
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  22. #82
    Opens HoonBoy's Avatar
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    Yeah, was thinking about that last night. Make the pickup points bolt on so they can be adjusted as needed.

  23. #83
    Registered User lightyear's Avatar
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    Quote Originally Posted by Cal View Post
    Are they the nickel version of the 949 wheels?
    Yep, that's all he had left. They look a lot fatter than the 8's with 205's.
    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 1:46.0 WNTN 1:33.5

  24. #84
    Opens profi's Avatar
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    Quote Originally Posted by lightyear View Post
    Nah, but just rock up and say you thought they come out like that.
    Seriously?

  25. #85
    Registered User lightyear's Avatar
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    Quote Originally Posted by HoonBoy View Post
    Yeah, was thinking about that last night. Make the pickup points bolt on so they can be adjusted as needed.
    Make sure you take pics. I don't know a lot about suspension, so i was going to replicate the same pick up points - as i know they work.



    Profi - No i am not serious, but it would be a laugh to see the scrutineers face when you tell them that it is a standard limited edition rear drive "sprint".
    Last edited by lightyear; 16-06-10 at 08:44 AM.
    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 1:46.0 WNTN 1:33.5

  26. #86
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    On a serious note, would i be able to run for no points in the superlap thing?

  27. #87
    infantile egomaniac CussCuss's Avatar
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    why bother, its just a timed run.

    Turn up at a normal track day, get a time, spend extra $600-$2000 on coke and hookers.
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  28. #88
    Registered User lightyear's Avatar
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    It is really a glorified timed run, but is usually better promoted, and you can win a dodgy trophy. The cost is similiar to a normal track day, so no coke and hookers. Maybe you should shoot an email to the organisers that run the superlap and see what they say.
    Last edited by lightyear; 16-06-10 at 08:40 AM.
    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 1:46.0 WNTN 1:33.5

  29. #89
    Registered User lightyear's Avatar
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    I took the head off the the motor from my old car and the pistons don't look too good.


    That's no1 piston. The others don't have a hole, but have heavy pitting on the intake side of the piston like you can see on this one.

    Can anyone tell me if the head is fixable? It has the same pitting around 2 of the outer cylinder edges. Hopefully it can be welded and machined.

    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 1:46.0 WNTN 1:33.5

  30. #90
    Registered User 9triton's Avatar
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    Quote Originally Posted by lightyear View Post

    Can anyone tell me if the head is fixable? It has the same pitting around 2 of the outer cylinder edges. Hopefully it can be welded and machined.

    ]
    is it an alloy head ?

    yes ?

    then your answer is here:



    http://www.performanceforums.com/for...ighlight=isuzu
    Last edited by 9triton; 16-06-10 at 10:34 PM.

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