DIY Plywood Racecar Splitter // Ep 81 // Time Attack TURBO Build

After numerous requests for more detail on the front splitter on my NB MX-5, I've finally found a spare moment to get up close an personal, and bring you along for some info. ⇊ More ⇊
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[@eventide5727]

Love the NACA ducts. Just downloaded the STL for future use. Thanks.

[@Bbeavis]

Enjoy!

[@fooproductions8312]

@@Bbeavis Are the NACA ducts still available?

[@Bbeavis]

@@fooproductions8312 Yes, link in description.

[@fooproductions8312]

@@Bbeavis Thanks

[@38tech]

Now the side splitters and rear diffuser. Please and thank you.

[@Bbeavis]

OK OK coming some day in the future, I promise!

[@skun80]

Nice setup mate

[@Bbeavis]

Thanks!

[@bonestorm007]

Thanks for the tutorial!!

[@Bbeavis]

No worries, is your username based on the Simpsons episode with the game of the same name?

[@bonestorm007]

Hahaha. Yep.

[@aroundtheworld4785]

Hey Brendan, another great vid. Thanks, man! Any chance we could talk you into a quick intro to properly stripping out circuits for stuff you've removed? Maybe show an example? No worries if it doesn't fit into "the plan."

[@Bbeavis]

Thanks mate. When you say "stripping out circuits", are you referring to the wiring harness of the car?

[@aroundtheworld4785]

@@Bbeavis Yeah, so like if you are prepping a car for the track and stripping out all kinds of extraneous stuff (e.g., stereo, fans, A/C, seat belt sensors, door sensors, etc.), _if you know absolutely nothing about car electronics_, how do you reason about what to do? What's the role of the fusebox? What happens when a wire I don't need anymore traces back into some giant wireharness full of other stuff that may or may not be important? When do I have to do something special to not F$@# things up vs. when I can just rip something out with impunity, and how do I know that? Like, what things can the ECU run without vs. which will screw things up (e.g., if I remove radiator fan #2 completely...)? I know that if I knew the right principles I could just figure it out, but I'm not sure where to start. I know the 101 of electricity, circuits, voltage, current, resistance, etc., but I don't know anything car-specific. I don't know the right questions to ask or the right things to Google. I selfishly figure others might be in the same boat :) Actually, I guess everything in the vein of "how to track prep a car" would be pretty cool if you're ever looking for ideas...

[@Bbeavis]

@@aroundtheworld4785 Oh wow so many things to cover! I guess a lot of that is very specific to each persons own goals with their car, and with their own specific setup. Everyone has their own way of doing things and I cannot say what is the "right" way. For me, mostly i just traced unused wires individually through the wiring harness one by one all the way back to where they hit a connector, or terminated at the factory fuse box, and then cut them out there. Doing it slowly and one by one means I ensure I'm only removing wires that weren't in use. If a wire isn't plugged into anything, then I knew it was safe to remove. I never just "rip things out" without checking they aren't used. I've only done this once, on this car, so I'm no expert!

[@aroundtheworld4785]

@@Bbeavis fair enough. That's helpful. Thanks! Regarding NA/NB MX-5s though, what about things that go to the ECU? I'm thinking things like fans, sensors, etc. If I truly don't need them, can I just remove them? Or will the ECU freak out if it can't find, say, the second radiator fan, or the MAF sensor?

[@Bbeavis]

@@aroundtheworld4785 Your car needs its sensors to run, don't play with those unless you know what you're doing. "Dumb" things like lights or a fan, it's a just a power wire from a fuse box, and often not a wire back to the ECU, those can usually be removed. But if you don't know, don't do it.

[@jackottinger6209]

Awesome idea. I have to say thought that those NACA brake ducts probably do the reverse of what you want them to. The air under the car is relatively low pressure (high velocity) compared to the stagnant air in the wheel wells. This difference in pressure will most likely suck air from the brake to the bottom side of the car. Better to place the inlets on the nose of the car just above the height of the splitter where the total pressure is the highest.

[@Bbeavis]

Thanks Jack, certainly a few people have questioned the validity of using a naca in this orientation, its more just an experiment. Hard for me prove or disprove whether it works without properly monitoring temps sadly.

[@bhengineering]

Please please please solve this debate once and for all! All you need to do is tape a grouping of strings on the duct in and near the opening then place a camera behind it. The direction of the strings should tell us if this is working as intended. And the camera behind shouldn't affect the flow. Thanks!

[@r33skylineprojects59]

Can you make an other 2 naca ducks ? I can’t find them that small ?

[@Bbeavis]

Hey, you can get the design here, and 3d print your own: www.thingiverse.com/thing:3896806

[@GoldenSlothRacing]

Definitely agree on getting the good plywood, I tried the bunnings plywood and even when braced it lasted half a lap before cracking in half... :D

[@Bbeavis]

100%, bunnings should be embarrassed at the quality of their materials sometimes.

[@andrewf8486]

How much of a difference does it make?

[@Bbeavis]

I'm not sure how to give you an answer to this question as the net "lap time" is difficult to measure exactly. What a splitter does do, is provide balance with the rear wing, front end grip, and a very sharp and responsive handling car.

[@andrewf8486]

BEAVIS Motorsport it would be cool to see the difference in g’s with and without the spoiler

[@Bbeavis]

@@andrewf8486 It wouldn't be a nice car to drive without the spolier, that's for sure!

[@benny225]

I may have missed it, but what supplier did you use for the Plywood? Cheers

[@Bbeavis]

Plyco in Melbourne - plyco.com.au

[@benny225]

Awesome! Cheers mate

[@gm5383]

OK now I'm sure of it, you're just going through all the questions I asked you on nutz a few years ago and making videos aren't you lol

[@Bbeavis]

Haha, perhaps.... got any more that I haven't answered??

[@gm5383]

@@Bbeavis , hmmm let me think, the flat bottom, the wing, brakes, splitter mounting, rad ducting.... nope I think that's it. I did ask about the cage once but I think you touched on that when you did the history of the build. O, have you done the diffuser, I can't remember?

[@Bbeavis]

@@gm5383 Oh, I have so much work to do now! I do have a number of videos covering the wing, and a video on brakes, and on rad ducting, try these: kzbin.info/www/bejne/o6XTm2dqpbh3gc0 kzbin.info/www/bejne/foPcdpSBl5aWgLs kzbin.info/www/bejne/rampcqhrpKdllck kzbin.info/www/bejne/jIavonycjNqSjqs

[@Dobuya]

What I got from this video...."It looks kinda cool"

[@Bbeavis]

Number 1 priority is a cool looking track car. It ain't fast if it doesn't look cool.

[@cadefuller4802]

Hey mate where did you find the birch in aus? Can only find it in Melbourne

[@Bbeavis]

Yeah I got it from Plyco in Melbourne - plyco.com.au

[@provar1]

Thanks man! I was stuck for ideas on front mounting, just finished mine today thanks to this!

[@Bbeavis]

No worries, always happy to share ideas!

[@BodenM]

Hey Beavis, when 3D printing those NACA ducts, should they be printed as oriented in the model, or printed with the inlet surface of the duct facing the bed?

[@Bbeavis]

There are no rules, just whatever you think works best for you and your printer.

[@donfinch862]

Interesting. Simple is best. Thanks Brendon

[@Bbeavis]

No worries!

[@Amazingblocks]

I wanna know what you used to hold the brake ducts in the wood and also will a video on your fender setup ever come

[@Bbeavis]

Brake ducts are simply glued with sikaflex. There are multiple videos on the fenders already, try check these out: kzbin.info/www/bejne/qniTaJZqpNRppcU AND kzbin.info/www/bejne/h5_WkGWXfseNkMk

[@Amazingblocks]

@@Bbeavis thank you I tried to look obviously didn’t look good enough thank you ❤️

[@Bbeavis]

@@Amazingblocks My pleasure, if there's anything else you want more detail on, please let me know I'll help out where I can :)