How to Build An EPIC Diffuser For $100! (Full Parts List Included)

Рет қаралды 90,265

3 жыл бұрын

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More Info About The Build: (Quantities are to replicate mine)
48" x 48" x 0.187" ABS Plastic Sheet (1 needed):
www.eplastics.com/ABSBLK0-187...
100-Pack of #10-24 Machine Screws (70 needed):
amzn.to/35ARVeb
100-Pack of #10-24 Nylon Lock Nuts (70 Needed):
amzn.to/36GpgUn
50-Pack of L Brackets (35 needed):
amzn.to/2UAS5vC
2-Pack of Splitter Rods (2 needed):
amzn.to/3nvxaGQ
1-Pack of DEI 12" x 24" Heat Tape Sheet (1 Needed):
amzn.to/3lC4Thb
1-Pack of Black RTV (Less than 1 tube needed)
amzn.to/36EcG84
The following pieces are exactly the dimensions of the parts used in this build, but it's hard to find small quantities online. It will be much better to source them locally from a hardware store, or shop around online for similar products in smaller quantities. Total cost for everything below, in the quantities used, was about $11.00.
1" x 0.125" Aluminum Flat Bar, Yes I said steel in the video SORRY (12" Needed)
amzn.to/2INR1St
#12-24 Machine Screws (2 Needed, Rear Bracket-to-Splitter)
amzn.to/3no8AHU
#12-24 Nylon Lock Nuts (2 Needed, Rear Bracket-to-Splitter)
amzn.to/38PCvVE
#12 Flat Washers (4 Needed, Rear Bracket-to-Splitter)
amzn.to/3lDEFev
1/4" x 28tpi x 1" Hex Bolts (2 Needed, Rear Bracket-to-Car)
amzn.to/3nsTOzJ
1/4" x 28tpi Nylon Lock Nuts (2 Needed, Rear Bracket-to-Car)
amzn.to/3lGZRAc
1/8" Drill bit was used to drill for the #10-24 screws threaded into the ABS
Standard AND Metric Screw Size vs Tap Drill Size Chart:
www.lincolnmachine.com/tap_dr...
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/ jinsoku_nb
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All amazon links above are affiliate links

Пікірлер: 304

@loganalbritton1441 3 жыл бұрын

buying home depot stocks now before miata nation descends on the aisles

@ianfairbanks1318 3 жыл бұрын

LMFAO. truth.

@byGodspeed 3 жыл бұрын

STONKS

@juanestrada_ 3 жыл бұрын

Not only miata dad helps us make our miatas fast but he also helps us get that street cred

@FlyingTofu 3 жыл бұрын

I cant wait to make this diffuser for my gaming chair

@user-sd1ry6jw3u 3 жыл бұрын

That "steel" you have there certainly has the thickest aluminization I've ever seen...

@PANTYEATR1 3 жыл бұрын

great video Greg, there's a few things i will add tho...instead of ABS plastic, I'll be going with 3/8" thick high density polyethylene. this stuff can bend in a complete "V" and not spider crack. it's UV resistant and has memory. it will always go back to its original shape should you hit something or bend it...i would use washers on your oval holes, it will help with clamping force. lastly, when i build mine, I'll take it back apart to have each piece hydro dipped in carbon fiber. I'll be using some of these techniques when i build a diffuser and splitter for my mustang 💪

@kwbalance108 3 жыл бұрын

Good to know man, thanks for the heads up!

@itz-amemario426 3 жыл бұрын

Actually ABS is way better for that purpose than PE.

@PANTYEATR1 3 жыл бұрын

@@itz-amemario426 oh wow really? I'm not an expert, but i liked the properties of PE. can you explain why it's not good for street cars and race cars? thanks

@itz-amemario426 3 жыл бұрын

@@PANTYEATR1 It isn't bad, It just wouldn't be my first choice. ABS is stiffer and tougher, it has decent heat resistance and you can easily glue and weld it. You can form ABS using heat. PE is softer, it deforms permanently. PE is good for stuff like paddings, bushings, gaskets, or non stick surfaces, so food processing or linings. That being said I wouldn't bother with either and go straight to aluminium or alumalite.

@PANTYEATR1 3 жыл бұрын

@@itz-amemario426 thanks for your reply. i choose the PE cause it has impact resistance and it returns to the original form if a parking curb or speed bump was hit. in cold/hot weather temps, i don't know if ABS could handle those issues without chipping. since this will be on a street car, i wanted something that could handle the imperfect habitat of the streets. if it was a race car only, aluminum or alumalite would be an option. i don't recall the thickness of the ABS used in the video, but I'll be using 3/8" thick PE. I'll run the information mentioned through the plastic store expert and see what they say. if ABS is good enough, I'll buy that. i know it's definitely cheaper.

@filibertodelacruz727 3 жыл бұрын

Whenever I have a bad day I watch the Car Passion Channel... Then Happiness

@ch_chone 3 жыл бұрын

Nerdy comment about using 1 fin for tracing all other fins vs tracing each fin off of its predecessor; that's a brilliant example of error propagation! 1% error on tracing and cutting each fin successively = 1.01*7 = 1.07, or 7% error by the time you've cut out fin #8. Compare that with 1% error if you were to trace fins 2-8 directly from fin #1. Pretty neat!

@haydentakara4369 3 жыл бұрын

That’s why you use the same fin for each tracing Edit: well actually you literally just said that so lmao

@yo_its_devo 3 жыл бұрын

It's like the fabricators version of the telephone game lol

@soggysweatsocks 3 жыл бұрын

This feels like an architecture project, fun stuff greg, great video!

@daleabono3616 3 жыл бұрын

Completely off topic: from the looks of the back tires, you are having a lot of fun with the car. Yay!

@38tech 3 жыл бұрын

He did this vid before going to the track. His track video had the diffuser on the car already.

@daleabono3616 3 жыл бұрын

Be that as it may, its a "getinsitdownshutupholdon" kinda car that makes it so awesome.

@revlimiternet 3 жыл бұрын

Beautiful work sir! Such diffuse. Very airflow. Wow.

@FDB77 3 жыл бұрын

Finally the diffuser vid!

@carlosarmero594 3 жыл бұрын

First off thank you for taking the time from your everyday life and dropping all the legit content you put out. I admire your passion for the MX5 , much respect for what you do.

@josuedavid6584 3 жыл бұрын

subscriber since the old 1.6, i'm amazed by how much this mx5 has evolved, inspired me to get my own and work on it, miata dad is the f goat.

@kevinroberts9096 3 жыл бұрын

Looks AWESOME 😎

@drpiv 3 жыл бұрын

Looks so good. Awesome.

@KingandTitanRacing 3 жыл бұрын

Awesome video guys, very helpful and informative. Diffuser will be one of our next projects on our MRS and this os exactly how we were thinking of doing it.

@trix4rix 3 жыл бұрын

Huge fan of these DIY's, keep them coming!

@jakubtrzpis2595 3 жыл бұрын

looks amazing

@chancealger4740 3 жыл бұрын

This is so cool! Not to mention an amazing idea!

@iamadmin240 3 жыл бұрын

Greg.. you the man ❤️

@thebrowntown1337 3 жыл бұрын

Saving dis for summer time

@slicktop2jz855 3 жыл бұрын

So sick man well done

@supercarmio 3 жыл бұрын

dude, that came out awesome! really nice work & super easy to follow.

@goretro77hobbies 3 жыл бұрын

I was waiting for this vid! Hats off and respect to the Miata guys dong this rear DIY diffuser. I'm sure its functional and looks tasteful in my eyes.

@gunnarnordstrom2515 3 жыл бұрын

Tip, about the silicon instead of using the screwdriver. Take some soap water dip your finger and just smooth it out, will not stick to the skin and looks better.

@abcsteve 3 жыл бұрын

Super rad, good job man!

@jasonc2948 3 жыл бұрын

Looks amazing man! Nice work.

@markstorer7204 3 жыл бұрын

Great job Greg ✌

@killer_bro_empireitsme3613 3 жыл бұрын

Been waiting for this video for a while now thanks Greg

@38tech 3 жыл бұрын

That is so tight!!!! Love it.

@austinmorris8490 3 жыл бұрын

Ima have to try this seems pretty simple

@buildingfilming 3 жыл бұрын

So sick!

@brokeboycustom7655 3 жыл бұрын

I love this so much. Can’t wait to try it out on my car

@yo_its_devo 3 жыл бұрын

Tip: run a finger along the length of the fin to even out the bead of silicone. Best way to get a nice even finish. Learned that from home renovations. I looked for a good tool for a bit the first time I did caulking and then I saw a couple videos and realized the best tool was attached to my body already :)

@mmarkzx 3 жыл бұрын

that is neat! thanks for the video!

@lander917 3 жыл бұрын

Awesome!You are the best.

@Gnasherism 3 жыл бұрын

Fully sick

@jeanboy9108 3 жыл бұрын

looks good, might have to try to do this on my NB

@carbonxiiinv Жыл бұрын

Great video!!! I looks amazing

@jimd1617 3 жыл бұрын

Great job, dad!!!

@jake10386 3 жыл бұрын

Definitely trying this on my 95M!

@hoonata_209 3 жыл бұрын

Pretty solid. Came out nice. Going to attempt to make one for my 17 Hyundai Sonata Sport 2.0T

@martsec9330 3 жыл бұрын

Amazing

@blushmatter 3 жыл бұрын

clean !

@jojonoshie5185 3 жыл бұрын

This sick

@evannoriega-thomas371 3 жыл бұрын

Great job Greg! Adds an amazing look. Me personally, if I ever do this, I would give the hardware a quick spray of black paint because I don’t like the “studded” look the hardware gives being silver. But hey, none the less, this is an AWESOME template that people are going to be able to use to make their own, perfect to them, diffuser. Thanks for bringing the knowledge and showcasing it for us.

@Criam 2 жыл бұрын

Saaaaame

@zokusharuuku1091 4 ай бұрын

Ok I get it I don’t have any friends thank you for reminding me. Also I recommend aluminum composite, it’s more stiff and rigid and holds bends and won’t flex plus you can make it thinner for less weight. My diffuser in 1/8 inch thick.

@captianknuckles 3 жыл бұрын

Is that parking lot at the end the same one from the “stolen” hardtop video?

@spoolin2bars 9 ай бұрын

Looks a lot like the one I made for my time trial/ time attack turbo ‘95 Miata back in 2010. I used aluminum. Made a template out of cardboard. Used the same mounting points even. I made the same rear L shaped mount but made it shorter and bolted straight to the same bolts holding the tow hooks. Then I used a small piece of “all thread” which is just a rod that with threads end to end. I think it was 5/16”. Then used nuts and washers to hold it to the L bracket which allows me to adjust the height. Using aluminum allowed me to just have the 2 chassis brace points on the forward edge, and the 2 rear points and it was solid as hell and I could install and remove it in a couple minutes without jacking up the car. Also used way less hardware to hold on the strakes with the better materiel. Not to mention aluminum doesn’t melt from your exhaust.

@zeppie2002 Жыл бұрын

Nice project! I agree that some rough edges and no smooth silicone kit gives it a nice racing-touch. A lot of work, but: Well done. 😮

@tehpillemannerator 3 жыл бұрын

These slicks man. 😄👍

@DOM-cc 3 жыл бұрын

this is awesome, definedly will build one for my civic

@777MAV 3 жыл бұрын

Great DIY! I strongly advise you to add some kind of rigid brace joining two rear mounting points and connect central section of the diffuser to that brace. Aluminium angle or square tube is first thing that comes in mind for this. Because it seems that it might not hold for too long if it really works and will be able produce any significant downforce. Ant it looks like it really can! ;) Shape of the diffuser definitely provides some rigidity, but abs+exhaust heat+force applied will probably bent it out of shape over time. Ideally you can use fins mounting bolts to hook central section to the brace.

@quakey5830 3 жыл бұрын

Nice slicks craig

@reborngarage1 3 жыл бұрын

Yeahhh fresh content 😍😍😍

@SmukKully 3 жыл бұрын

It’s defo getting done... was gonna go the omg miata way but this is much more home brew.. and not as time and money consuming 👌🏼👌🏼💪🏽 for when I fuck it up on track

@mrmidnight32 3 жыл бұрын

Can’t wait to see every lowered Miata with one of these now 😂

@rac3kar 3 жыл бұрын

Just what we miata people needed! Thanks dad

@kingjay3301 2 жыл бұрын

I need some like this for my ek coupe

@TC_10000 3 жыл бұрын

Why not use shorter screws so they don’t stick out sideways?

@mixalisstathis274 3 жыл бұрын

Rivets!

@winguard96 3 жыл бұрын

@@mixalisstathis274 my thoughts exactly!

@VintageTechRepairs 3 жыл бұрын

@@winguard96 if it gets damaged bolts make it easier to fix ;) but saying that i do like the sound of Rivets

@whitebear96 3 жыл бұрын

one thing I would change immediately in my build are the screws. first off black screws (optional), but most importantly I would use the sleeved type of screw/nut combo with flat head that screw into each other and you end up with two flatheads on both sides with nothing sticking out. Rivets would do the same job, but then its harder to adjust or pull apart/replace damaged fin. other than that sweet vid, thanks :)

@berniehayhurst1811 3 жыл бұрын

They are called "Rivnuts" in aviation.

@whitebear96 3 жыл бұрын

@@berniehayhurst1811 oh, didnt mean rivnuts, did a quick search for those im thinking of and funnily enough, they are called sex bolts or chicago screws :)

@ThatoneFRC Жыл бұрын

Just want to say google brought me here and Im super happy it did. Thank you!

@machtmonk 3 жыл бұрын

Would love a vid with some A/B testing to see if this thing works. I guess there is no easy way to see if it prdouces some downforce, but maybe some 100 - 200 kph pulls to see if drag is reduced.

@christianzinn7636 3 жыл бұрын

It looks OUTSTANDING!!!!!!!!!!!!!!!! I'm Not a fan of cut bumpers, so this finishes your car Very Nicely. Great work!!! It would be interesting to know how it changes your seat of the paints feel when driving hard. Perhaps a LRB Speed type of front under tray for the front???

@JonahAberle 3 жыл бұрын

Looking forward to the next ECU vid

@b00sted_mx59 3 жыл бұрын

I didnt even think about the edge trim on the bumper cut ill have to try it out. Also i love that tire setup, looks super good from the back. I cant find many places to buy the Nanking tires unfortunately.

@andrewf8486 3 жыл бұрын

Looks good, I have thought about doing this but I am too afraid to do a bumper cut. Looking at the process you guys used I think you could have made your life a little easier if you would have used a heat gun to relax the plastic.

@TheEverWickedWonder 3 жыл бұрын

Use a woodburning tool and abs zip tues to platicweld it instead. Do it outside or with good ventilation.

@ghostpunkkilla 3 жыл бұрын

Yiiiiisssssssssss! Been waiting for this :0

@JohnnyTaytor 3 жыл бұрын

greg it's called flatbar! also, use simplegreen and spray it onto your caulk bead then run your finger across it. i promise it'll look a lot better than the screwdriver method lol

@dougsfan9984 3 жыл бұрын

EPIC!

@iRidetas 3 жыл бұрын

hell yeah

@pablocrvzz2985 Жыл бұрын

Spray the nuts and bolts black and its perfect👍🏾🔥

@ilovepsycku 3 жыл бұрын

Need a custom diffuser! 😍

@marcjoseph8300 2 жыл бұрын

The exterior fins toward the engine should be closer to the center. The one center fin should be straight. So to create a vacuum effect or sucking effect.

@filibertodelacruz727 3 жыл бұрын

It ain't perfect but it looks so good! ❤

@scottcameron5972 3 жыл бұрын

Sick

@jrivera2240 3 жыл бұрын

Now I got to make one out of aluminum and flush rivets

@AlexPerrucci 3 жыл бұрын

Yeah this looks badass! The rear of your car is sooo mean looking with this and the meaty tires haha. Great vid! Really want to try this now for my car.

@flipflop7577 3 жыл бұрын

Yes go for it! Your NB is mint👌

@InfiniteCheeseCrates 3 жыл бұрын

@11:32 The word you are looking for is aluminum flat bar

@gsh3159 3 жыл бұрын

Just a thought but I'd be swapping the bolts and nuts holding the fins for rivets. Some black ones would be much less visible

@scmiata99 2 жыл бұрын

Brother I know its an older vid, but man that shit is popping!!!! maximum street cred!!!!

@tadascerniauskas6919 3 жыл бұрын

Epic!

@BeckersGarage 3 жыл бұрын

I have a few of these to make now!! One for the Miata, one for the Vette, and maybe even one for the daily lol

@imboredadr 3 жыл бұрын

You can buy door edge guard on Amazon that looks a little better and grab on way more effectively. Not only does it fit well around the bumper cut but it also fits around the rear lip of the hardtop and cleans up the look of it a lot.

@alexjohn5086 3 жыл бұрын

Pool liner edger works better, but only comes in white....;-(

@Humco_ND2 3 жыл бұрын

Thank you guys so much for this, this will be my next mod for sure. Hopefully we can see a front splitter mod too. Quality KZfaq channel, highly underated.

@Kthreeyou 3 жыл бұрын

Damn that guy is tall! Nice NB!

@badfurniture9268 3 жыл бұрын

good

@johnnycashh7148 2 жыл бұрын

Wrapping your muffler with manifold tape would have looked bad ass too. 🔥🔥🔥

@dansattler882 3 жыл бұрын

Holy cow! Your car has a nice caboose.

@ir4kk 3 жыл бұрын

I can't believe it took ya this long for the edge trim lol it's the best

@NippyMoto 3 жыл бұрын

Damn those AR1s turned into full slicks real quick haha

@reneneron2971 3 жыл бұрын

Nice work. Consider attaching the fins with rivets instead. Rivets sit flush, are cheaper, lighter, faster to install. and will not come loose over time.

@afhostie 3 жыл бұрын

Are you going to have to put in a full under-tray to keep air from going between the car and the diffuser ?

@brokentougers8252 3 жыл бұрын

Welp, don't own a miata yet , but sure this is in the bucket list :D

@ajsaracina8380 3 жыл бұрын

Looks sweet! But I probably would've used rivets for a cleaner look, and also save money on all that hardware.

@waynethegiant 3 жыл бұрын

Maybe you could try replacing the nuts and bolts with rivets 🤔 would look more slick. Dunno if you'll find anything for 5mm+ thick material though

@maccarioandrea 3 жыл бұрын

You should do a test with some wool ropes and tape + GoPro to see if the flow is attached. What's the weight? Do you feel any difference? Looks sick ;)

@crewjones 3 жыл бұрын

Go to Marshall's hardware for all you nuts and bolts, they are in Miramar. They have a crazy selection and great prices and no I don't work there.

@Obeisance01 3 жыл бұрын

will you perform a string test to see how well airflow follows under the diffuser? i mean, tape some string or yarn to the diffuser on the rear part of the strakes and plane, point a gopro at the string (keeping the camera out of the airflow) and check to see that the strings are pulled straight back in laminar flow instead of being pulled randomly in turbulence. this can show if the upward sweeping angle of the diffuser is too steep.. in that case the airflow will be stall-like and turbulent.