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Thread: Building MX5 Time Attack Cars

  1. #721
    Registered User Marlin's Avatar
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    A claw hammer......?

  2. #722
    Registered User lightyear's Avatar
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    Quote Originally Posted by jimmyg View Post
    You do seem to change you plans a wee bit dont you.
    Not really, it started as a Time attack car, now being built as a 2B race car. That's only one change. 😊
    Claw hammer was to hit the spanner to loosen the exhaust manifold nuts.

    I will port the wastegate and the manifold flange this morning. And hope that fixes the boost creep when the 3" exhaust goes back on.
    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

  3. #723
    Registered User lightyear's Avatar
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    Pic of the inlet side of the head, and another pic showing the size of the tiny turbo going on.






    image url upload
    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

  4. #724
    Registered User lightyear's Avatar
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    Ported the flow to the wastegate and unshrouded the exit path. And decided to open up the manifold for good measure.







    image hosting 12mb

  5. #725
    Registered User Justengt4's Avatar
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    That's a lot of nasty cast iron splinters to deal with, ouch
    GT8
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    1.07 flat Wakefield Park

  6. #726
    Registered User lightyear's Avatar
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    Better than carbon fibre splinters.

  7. #727
    Registered User lightyear's Avatar
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    I figured I should check the port match from the head to intake since I am changing intakes. Lucky I did, the manifold is almost 15mm too low. I think this is a GTR head, not an MX5 head. Would explain it. So now the inlet has to have bits welded to it, and all the holes redrilled. I picked up the 1000cc injectors. I assembled the 3.6 Torsen diff, replaced the bushes with nolathane and fitted the lot into the car. PPF is on, tailshaft is on, the whole exhaust is on. The worst part is trying to find the nuts, bolts and bits that I removed 6 years ago.









    adult photo sharing
    Last edited by lightyear; 11-08-16 at 11:16 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

  8. #728
    Registered User schnitzelburger's Avatar
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    would the block have the familia guts in it too?
    Turbo NB MX5: more derp less carbon lightyear clone
    Supra sold it: 1983 MA61 Supra - 2JZ-GTE + 6spd

    ohsdocs.com.au Safe Work Method Statements and other OH&S paperwork for builders and tradies, PF members PM me I'll do you a good deal.

  9. #729
    Registered User lightyear's Avatar
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    I will have to try find the old paperwork from the build. I can't remember everything that was done to this motor. I do recall him saying the block was a very low k one. It has forged rods and pistons, etc. The bottom end was about $5000 or more. Has some rifle drilled things, chamfered oil galleries and modified oil pump from memory. Not sure if it is an MX5 block. I do remember giving him 3 heads (2 turned out to be soft), and in the end he swapped the head he was going to use with this one as a guy spent a lot of money on the head, and then wanted my head to fit into some class.
    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

  10. #730
    Registered User schnitzelburger's Avatar
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    ahh ok

    getting a handle on whats compatible with what is in the back of my mind if my motor pops.
    Turbo NB MX5: more derp less carbon lightyear clone
    Supra sold it: 1983 MA61 Supra - 2JZ-GTE + 6spd

    ohsdocs.com.au Safe Work Method Statements and other OH&S paperwork for builders and tradies, PF members PM me I'll do you a good deal.

  11. #731
    Registered User lightyear's Avatar
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    If your tune is right and you do regular oil changes, there is no reason your motor will pop. I thrashed these motors in stock or near stick form with turbos. It doesn't bother them. Only failures where my fault- first time was a radiator hose came loose, overheated and melted the Pistons. 2nd time was a guy screwed the wastegate so it wouldn't open. Over boosted on a stock $300 motor.
    Last edited by lightyear; 12-08-16 at 10:08 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 1:43.8 WNTN 1:33.5

  12. #732
    Registered User schnitzelburger's Avatar
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    good to know

    i better get my heap to a tuner to check i suppose
    Turbo NB MX5: more derp less carbon lightyear clone
    Supra sold it: 1983 MA61 Supra - 2JZ-GTE + 6spd

    ohsdocs.com.au Safe Work Method Statements and other OH&S paperwork for builders and tradies, PF members PM me I'll do you a good deal.

  13. #733
    Moderator Cal's Avatar
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    I've never seen an MX5 exhaust welded to a subframe brace like that. Does it cause vibration or manifold cracking at the other end?
    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.

  14. #734
    Registered User lightyear's Avatar
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    The hanger is a bit like a subframe brace I suppose. I ran it like that in the silver car and it was fine. The engine mounts are as close to solid as you can get. And there is a flex join. I think there is more stress mounting on rubber hangers. The exhaust moves so much around corners. This way nothing can move at all.
    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

  15. #735
    Registered User lightyear's Avatar
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    I am trying to finish cleaning the garage, and I have told myself that instead of moving parts around that go on this car. I may as well install them. It's not really working on the car, it's putting parts away properly. But like the diff, it can't just be installed without doing some prep. I bolted the door inner halves on properly. But had to remove some metal from the hinges. They are not that heavy, but when you hold the (sub 2.0kg) door, it's front heavy with the hinges on.





    image ru
    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

  16. #736
    Non Compos Mentos Gammaboy's Avatar
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    Are you keeping an eye on the rule book as you go?
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  17. #737
    Registered User lightyear's Avatar
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    Nope, well I did try. Am I doing something wrong? I did ask and was told I can run c.f doors, roof, bonnet and boot.
    Last edited by lightyear; 12-08-16 at 09:09 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

  18. #738
    Non Compos Mentos Gammaboy's Avatar
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    It's forever since I looked at the 2B rules, tis why I asked.
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  19. #739
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    2B Art 3.9 permits removable non-swinging panels to be replaced, bonnet and bootlid as well as outer door skins (in this case, intrusion bars are required) are specifically mentioned. Since Art 3.9 by implication does not declare the door frame to be free construction, methinks that CF door-frame may well be a yard too far. David - form your own opinion. I'm not too sure that anyone cares, BUT the door frame is not specified as free and therefore should be OEM

  20. #740
    Registered User lightyear's Avatar
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    I don't know why there isn't an English translation somewhere. How hard would it be to write up some rules that someone like me can understand?
    I spoke with Owen who has been doing Prod Sports for years. He told me it was ok to run c.f bits. At the end of the day if I need to swap something over (like doors - 30minute job) its not a big deal. I will build it with all the carbon fibre bits and do a few track days until the car is sorted. Then get it logbooked and do any changes. But it should be close to being right once it built.
    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. #741
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    There isn't a class in motor sport where you can understand the rule book.

  22. #742
    MX-5 Hairdresser bbeavis's Avatar
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    They make it convoluted so that they (the governing body for the class/competition) can swing the rules to suit depending on who the competitor is and how they want to influence that competitors success.

  23. #743
    Registered User lightyear's Avatar
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    I had to get the NB8B inlet manifold bolt holes changed to suit this head. Then port match to the head. The Injectors are assembled and installed. So basically the motor is all together. Next is to bolt on the intercooler and intake/pod filter. Then that's pretty much the engine done once the oil filter/cooler set up goes on. Finding the time to work on it now is becoming scarce.
    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

  24. #744
    Registered User lightyear's Avatar
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    This car is now on its way to China as scrap metal. R.I.P.. I decided to give up on it as I lost motivation to finish it. The mechanicals and bits are going into the red NA MX5.
    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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