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Thread: Building MX5 Time Attack Cars

  1. #121
    HoonTV RotaUte's Avatar
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    So you'd never go N/A?

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  2. #122
    Jak Sie Masz! trent from punchy's Avatar
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    that's a 10 grand motor.
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  3. #123
    Registered User lightyear's Avatar
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    Exactly. Turbo costs much less. My 1.6 i have now cost me about $1100 to fully build. Mostly new standard parts. It can put out about 125-150 rwkw's depending on the tuner and the dyno. Aspirted it would owe me a shitload more for the same power. N/A is great for running in a specific class. But i win the under 3l class now. With the 1.8l it will bump me up to over 3l and put me against the skylines and evos. Then i will have some competition.
    Last edited by lightyear; 25-08-10 at 04:03 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

  4. #124
    Moderator Cal's Avatar
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    Quote Originally Posted by RotaUte View Post
    So you'd never go N/A?

    That's gay. Gary Stewart is making 220hp out of 1800cc with the standard inlet manifold. I'd expect that motor to push 280.
    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. #125
    Registered User lightyear's Avatar
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    Anyone can put up a video of an mx5 overtaking cars quickly.

    http://www.youtube.com/watch?v=7MkG-yCo6tg
    Last edited by lightyear; 25-08-10 at 05:15 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

  6. #126
    Registered User lightyear's Avatar
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    It's been a while. I have been finishing our house and it is now sold. I have sold the 1.6 motor that is sitting in the enghine bay in the pics. And i am getting a 1.8 motor built with good parts to take massive boost. For now i am getting the motor tuned for 200 kw's so i don't break any diffs and boxes. Be running about 15 pound of boost controlled by a motec m800. I have a turbo 6 speed box, and changing the diff ratio from 4.1 to 3.9 so i don't run out of revs at phillip island. Should be done by may i hope. I will update with some more progress in the coming weeks.
    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

  7. #127
    Registered User matt b's Avatar
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    Quote Originally Posted by RotaUte View Post
    So you'd never go N/A?

    I enjoyed that last pass!
    I do not like V slicers.

    "Give it the full rissole son" random old mate 2011

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  8. #128
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    Any reason why you are running a M800 and not the M400?

  9. #129
    HoonTV RotaUte's Avatar
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    I agree on the whole n/a thing now, I started pricing up an engine build and it was beyond stupid to do. Will still go low buck n/a for now, but maybe turbo later in the year.

    Pics/updates?
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  10. #130
    Prod Sports Racer CT's Avatar
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    Quote Originally Posted by lightyear View Post
    It's been a while. I have been finishing our house and it is now sold. I have sold the 1.6 motor that is sitting in the enghine bay in the pics. And i am getting a 1.8 motor built with good parts to take massive boost. For now i am getting the motor tuned for 200 kw's so i don't break any diffs and boxes. Be running about 15 pound of boost controlled by a motec m800. I have a turbo 6 speed box, and changing the diff ratio from 4.1 to 3.9 so i don't run out of revs at phillip island. Should be done by may i hope. I will update with some more progress in the coming weeks.

    You'll still break diffs, driveshafts and boxes especially at 200rwkw......even 1.8 ones.
    A slow day at the track is better than any day in the office.

  11. #131
    Registered User lightyear's Avatar
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    I think it is going to have torque pulled out somewhere in the rev range and maybe 4th too. I trust the guy that is doing it.
    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

  12. #132
    Registered User lightyear's Avatar
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    Quote Originally Posted by garvice View Post
    Any reason why you are running a M800 and not the M400?
    I don't know the differences, but that is what has been selected. I will have a few extra things like traction control, gps data logging, 8 injectors, etc.
    Last edited by lightyear; 28-01-11 at 01:33 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

  13. #133
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    8 injectors
    Guess that is the reason. M400/600/800 are essentially the same computers except for the number of cylinders they are designed for. Looks like M800 is also the only one with telemetry and has bit more logging capability too. Either way, very nice computer, enjoy.

  14. #134
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    does this thing have an M1 300 club sticker on the back window and were you on the south eastern yesterday?

  15. #135
    Registered User lightyear's Avatar
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    No, but i did push it out of the garage. It is just a rolling shell at the moment.
    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

  16. #136
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    ah k, seen an MX5 roundy round car on a trailer, with the sticker on top of the rear window and figured it would be a PF cunt, looked through threads but cant find one that matches, you know of anyone else on here that has a red one in vic?

  17. #137
    Registered User fattima's Avatar
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    That was me mate, coming back from PI

  18. #138
    Registered User lightyear's Avatar
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    The car is stripped down again and only the diff is in and the rear brakes. Now i have a whole new package going in.
    The new 1.8 motor is getting built with a bp26 gtr crank, acl bearings, eagle rods, 83.5mm arias pistons, fully balanced with 184mm twin plate clutch and matching flywheel, main oil galleries machined for hi flow, main gallery rifle drilled chamfered, etc.
    Bp4w head cnc cut seats, valves, cc'd, tuckin '99 adj cam gears, inlet manifold modified to run 2 sets of injectors. Motec m800, car will be run on e85 fuel only. Will be tuned for about 260 - 270 rwhp as that's all he feels the driveline will take safely. It will have some power/torque pulled out of 1st gear and more taken out of 3rd and 4th as they are the weakest gears in the factory turbo 6 speed i have. It will have variable traction control too, as well as accelorometer and gps tracking.
    While that is getting done i am putting in a spare motor to dummy up the exhaust and intercooler fabrication. And i will be moulding all the panels and making my own changes in the next couple of weeks. The motor will be ready by mid april, so the car should be going by the end of april i hope. I am also getting corvette rotors and calipers for it.


    Also the guy with the identical shell and cage doesn't want to build his car now. So if anyone wants to do something similiar and buy his car let me know. Would be great to still build 2 cars.
    Last edited by lightyear; 09-02-11 at 01:47 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

  19. #139
    Boosted Bubble Andy_W's Avatar
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    Who's doing the tuning - Meridian?

    Awesome work

  20. #140
    Moderator Cal's Avatar
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    Quote Originally Posted by lightyear View Post
    Will be tuned for about 260 - 270 rwhp as that's all he feels the driveline will take safely.
    CT said that 2 weeks ago.

    Just sayin.
    Last edited by Cal; 09-02-11 at 02:15 PM.
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  21. #141
    Registered User lightyear's Avatar
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    Quote Originally Posted by Andy_W View Post
    Who's doing the tuning - Meridian?

    Awesome work
    Tyrone
    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

  22. #142
    Boosted Bubble Andy_W's Avatar
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    Quote Originally Posted by lightyear View Post
    Tyrone
    Cool

  23. #143
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    Tyrone should know better than anyone that the gearbox will not take that power. Both CT and I have gone through a number of the Turbo 6 speeds, we will now be running RB25 gearboxes.

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  24. #144
    Registered User lightyear's Avatar
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    Well, he seems to think it will cope, and the car will be pretty light. What is invloved in fitting the rb25 box? Cost? And the ppf probably cannot be used. Then the next thing to break is axles and diff. Doh.
    I did get a start on the widebody.






    The top of the white box on the ground under the bumper is the ground level. And the splitter will sit on the drawn on line 70mm above the ground (also the bottom of the radiator opening). I hope that it's not too low, if it is, i can always cut out a strip to get more ground clearance.
    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

  25. #145
    Prod Sports Racer CT's Avatar
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    Quote Originally Posted by lightyear View Post
    Tyrone
    Cool....can you ask him when I might get my hardtop mould back??

    thks
    A slow day at the track is better than any day in the office.

  26. #146
    Registered User lightyear's Avatar
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    I can ask for you.

    I got a start on the rear wheel arch this evening. Still have to do the rear half.

    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

  27. #147
    infantile egomaniac CussCuss's Avatar
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    wow

    is here a reason for such a big extension on the front?
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  28. #148
    Non Compos Mentos Gammaboy's Avatar
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    Quote Originally Posted by CussCuss View Post
    wow

    is here a reason for such a big extension on the front?
    Makes the lap shorter.


    Seriously though, for a given overall length you'll get more downforce on the front with a shorter nosecone and longer splitter.
    Last edited by Gammaboy; 14-02-11 at 09:00 PM.
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  29. #149
    Registered User lightyear's Avatar
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    I thought that any surface that slants down toward the front will help with downforce. The splitter will be at the same level as the radiator opening, so it will be pretty long there. And maybe stick out about 150mm around the front edge.
    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. #150
    Registered User lightyear's Avatar
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    The drivers side is basically the right shape now. Just have to do the left rear tonight, it's not easy getting everything where you want it. Lots of measuring and checking. After that i will have to put all the flanges on and fair it all up. Probably 2-3days work in the final finishing before i can look at putting some undercoat on.

    Pic of rear guard. It is similiar to the panspeed rx7.



    Last edited by lightyear; 15-02-11 at 02:42 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

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