We Found the Secret to F1 Sound on the 4 Rotor Supra!

[@AdamLZ]

Bots have gotten so smart that they literally comment “I’m not a bot” nowadays…

[@timmi4190]

yeah its getting crazy xD

[@tiagotravessa8989]

Maybe you're the bot Mr Adam lz

[@Nick96z34]

Ha.... penetration....

[@planetarian451]

I’m not tho

[@AndyDufresne4]

For the love of god, please talk about the injectors!!!!!

[@WyFoster]

I know a gentleman who built exhausts for Benetton F1 back in their Schumacher era and now works for Ligier. He said, only ceramic coat the inside of the exhaust. You want to reflect that heat out of the header itself. Not coat it on the outside and trap the heat in the pipe. The more you know.

[@G29FLACKO]

this is the comment i was looking for i hope he sees this

[@johanneswarn5488]

Adam needs to see this

[@samlcyo2]

Well that sounds complicated asf lol How would you go about doing that?

[@WyFoster]

@@samlcyo2 It can be done. Believe they make spray nozzles that fire 360 that you can feed through the pipes.

[@trevormckeehen2010]

You want to trap the heat in the header so you’re not raising the temp under the hood. That would increase intake air temps and melt wires. I can see f1 cars being different if they’re designed to keep the exhaust away from components you need to keep cool.

[@ddiemundz]

21:43 is why mike is the best cameraman. no running, no swaying, just focusing on the shot. plus cameraman never dies anyway so he’s good

[@ShiroArctic]

Mike is the GOAT

[@BeeBeefy]

And there goes the new muffler, turning into glass again HAHA

[@brianhillger1922]

Also 12:26😂😂😂

[@Hellsatanx]

I gotta say, this naturally aspirated tuning stuff, with intake length/volume/speed, exhaust/header configurations is a lot more interesting than the usual "big turbo tune"

[@RESTORED_REPUBLIQ]

I've always been fascinated with the tuning of NA motors and obviously maxing it out for the most power. Much more impressive and interesting

[@kylelawrence6664]

s/o mike for not vaping

[@Twofrogsonecup]

Is it that hard to spell out shout-out?

[@carsonsanders2101]

Mike quitting made me quit 2025 here we come

[@gcjproductions9380]

Hell yeah Mike

[@27two]

@@Twofrogsonecup yes

[@TimmyTwoTuck]

Cigarettes are better!

[@thilmor4194]

Johan pinching his finger in the start of the video, I felt that😂

[@Berm_Blaster]

Made me chuckle lol

[@malibu4946]

I had to rewind to see what happened. He pinched his thumb 🫡ouch 😂

[@RotaryMotoring]

Next header from scratch! Rotary specific requirements. 26:23 26:23 1) 2" diameter ID with 3" minimum straight section out of port. Few and gradual bends as possible (no bundle of snakes.) 2) P-port- short header 10--18". Long header 89-94". No medium header! 3) collector minor diameter 115% larger than runner (2.3"). Larger diam the further from equal length the runners are (overlapping pulses) 4) megaphone to 3-4" diam (on 2 rotor- so bigger 4 rotor?) 10-15" long (slow divergence). Even more gradual convergence if needed. 5) larger diameter exhaust can run richer afrs for better scavenging (post collector expansion) try full 4" at least. Tuning. Smooth idle with p-port very low timing idle map and no split timing or negative split. However aggressive timing at no/low load for quick rev-up. Cold (ngk 11 or 12) plugs! The rotary specific race plugs add power. For power , small shower position 2ndary injectors for dense air charge (especually if you have undersize TB). Awesome progress!

[@rubenpereira132]

+1 on 2ndary injectors for power

[@cadenlebato4085]

NGK on top!

[@johnkpjm]

James Deane's 4 Rotor Rx7 looks like his headers are twice the length of Adams, he's also got the megaphone after the collector up to a 3.5" exhaust, instead of Adams 4". So his collector is probably shrinking to 2.75 to 3". He shows it at the start of his Rx7 build Part 3 vid.

[@RotaryMotoring]

​@@johnkpjmPackafing. For short headers Adam would have to turn his engins spark plugs down like in aviation and wrap the headers down the side of the engine. So, I think the long headers would be the easier. Easier to fit, easier to match lengths with longbradius shallow bends.

[@ChutneyInc.]

Less timing on NA?

[@2thumbsup247]

4:10 you explaining the difference with the editing is crazy good!

[@ekiny]

The day Mike goes back to 1080p is the day he has started vaping again. 4K has changed you

[@HamHound]

15:00 Adam subconsciously opening his mouth wider and wider with the revs lmao

[@itsmrfatal5373]

i can't unsee it now thank you lol

[@gabrielpoirier5268]

Passion

[@diposd8891]

And the slight eyebrow raises lol

[@sagnik8432]

This is gold 😂

[@benwallace5864]

Thought I was the only one 😂can’t blame him

[@DIESEL1JZ]

I really want to see variable intake runners on the 4 rotor, that was so revolutionary on the 787B and how it managed to make so much top end power but still have some mid range

[@SebastianBlix]

You’re 2/3 the way to the sound you want. First is equal length tubing to be able to reliably predict/control your exhaust pulses. Next is firing order to control/direct the timing of those pulses hitting collector. Final is stepped headers to disperse the velocity of those exhaust pulses. Looking forward to the vid where you put all 3 into practice and get that screaming 4rotor sound. 👍🏽

[@robdettlaff7841]

Wouldn’t adding a x pipe after the headers also help?

[@MarchuxProductions]

@@robdettlaff7841 how are you going to xpipe a single pipe bud

[@OnlyTheReal_RPM]

They already did that in the last video

[@austinhoward54]

Been saying it for years, your videos need 4K, and it's finally here I love it!

[@zerri08]

2025 brings a lot of good things! Even if u don't have a 4k screen the quality seems better

[@ekiny]

@@zerri08 well it’s still a higher resolution and more importantly 1440p and 4K gets you the higher bitrate which makes everything look much cleaner than YT’s default 1080p ugliness

[@zerri08]

@ekiny Exactly, I know how it works

[@tjramsey7274]

DAMNNNNN!!!! MIKE IS STILL NOT VAPING!!!!! THATS AWESOME MIKE KEEP IT UP MAN.... i like that adam mentions it every video because it not only holds mike accountable but also shows mike that he is proud and happy hes doing so good.

[@jonahlee3259]

Just wanna say the sound representation was incredible. Thank you.

[@jonahlee3259]

4:25

[@andrewcallender1128]

So stoked for mike not vaping! I quit too this year and I'm following along and loving the updates. YOU GOT THIS BUDDY !!

[@bossmanprezzie8923]

Mate what you did by speeding up your "diit" noise when explaining the collector firing order was absolute genius!!

[@caliboh]

Very !

[@texasr3229]

Always a smile on my face when I see more content from the LZ

[@KennyatHumble]

Hey Adam, it was me that was talking to Jamie about the header firing order. If you have any other weird rotary questions, just ask him for my info, and I can help out however I can.

[@coolj514]

Rare footage of Johan looking human while building cars 0:41 😂

[@russellneal1263]

Adam this new "style" of content lately has been great brother. always loved whatever style obv but it's drawn me back in

[@zzzz1192]

love how your doing thee test one by one, correctly, with an open mind. Proper content, that will last the test of time.

[@CoVeRtToWn]

Love when there is more "raw" and random "funny moments" in the videos. All of you never cease to make us laugh. ALSO 5:38 the Chaserrrr. Miss the chaser content as well! Makes me want to do stuff to mine more and more

[@Fizzo20]

1:48 about spit out my tea🤣 Big ups for the 4K and top notch editing! Congrats Mike for staying off the vape!

[@Kola.Racing]

I really like seeing these kinds of videos experimenting different kinds of things. Seeing what actually works, what doesn't and how it impacts sound. Also the step by step changes are very entertaining!

[@maxxrelax88]

Stepping the runners is definitely the key to the high pitch scream, because as the runner steps the sound waves spit raising the octave of the note, pair with equal length sequential collection will give max high pitch 😀

[@dakotastalder]

Absolutely love this series, would like to see more of this style content in the future

[@trevorrothall9628]

Sounds killer. Worth the extra effort. Crazy how the order entering the collector can make such a difference.

[@urawsomegamer]

Sounds better, but wouldnt say youve "gotten" the high pitch. Really, really curious to see what the stepped headers will do. Honestly believe it will be the key

[@maxxrelax88]

Agreed, each step splits the sound wave increasing the pitch

[@njivgnm]

Sounds good but it’s no f1 sound no offense. But on idle car sound is great.

[@R3Yoru]

Yea, it still got that unrefined 13b sound in it

[@Adatico1]

even before you talked about the resolution, I was gonna comment that I loveeee these 4K vids you guys put out. Great job, guys!

[@jsomething2]

fink's ls with 8-4-1 headers sounds more f1 than Adam 4 rotor. what a weird time to be alive

[@woooshbait2102]

@ link???

[@mozzarellabmx]

Well... F1 aren't rotaries, v8s were once F1 🫠

[@Akestler]

Rotary firing order

[@woooshbait2102]

@@mozzarellabmx didn’t ask for something a pre-schooler knows Asked for a link of what your talking about

[@Awnawbruh]

Needs stepped headers and 4-2-1 collectors

[@kartzgo9938]

2:20 Adam being stoked he's showing johans skill and having him explain it for us is rad. Can never have a KZbinr or an employer that's publicly excited about his employees as much as Adam is!

[@GirthBikesMike]

Love the LZ science! Deleted the clutch fan from my hard body way back in the day and always swore it was worth 15+hp! Guess I was pretty close. Hell yeah! Keep up the solid research and development.

[@SimplicityFab]

I love the fact it’s not even like your recording bro. lol it feels like im there lmao i think that’s one of the main reasons why i love watching so much. Just chillin in the shop talking cars having fun. Super dope too see all the progress you and the team made over the years

[@justin3131ify]

I'm the smart arse that said "can't learn what you already know" on the last video. I've watched old mate's stepped header KZbin video and I seen ALL of the comments from people saying that this is the key to sound... I snickered and didn't bother with commenting as I knew you'd eventually find your way here at some point. I noticed you were still using water to measure the pipe size...I can assure you that the ping pong ball/ golf ball method is far easier and works just as well as the water.

[@CC-vm3lb]

I’m just so stoked that Adam is getting back to the views he deserves!!!

[@hoov3y]

Love the E36 dyno content, it's tough making power with NA M5x motors. Hyde Motorworks makes some interesting kits to bolt a blower onto these engines, maybe something to try in the future for quick/inexpensive horsepower.

[@Bocaine.]

The 4k added so much. Thankyou for the effort!

[@jrolks101]

4 rotor Supra favorite car on channel. Never change that livery.

[@AdamSaltFPV]

Man guys! This one takes me back. In the 90’s, we’d build 85” primaries to pull as much power as possible on n/a 13b’s for scca cars. That and experimenting with variable length intake runners. See if you can find some 85 octane, for some reason they love it. Oh and before I forget, yeah no fiberglass packed mufflers. Those high egt’s will turn glass packs into glass pieces in a matter of minutes. Love the channel!

[@twodogsyyc6729]

Congrats Mike. Be proud bro i know its not easy to cold turkey quit! Much respect my friend.

[@Greg-TC]

shoutout mike not vaping. seriously not joking that can be hard to quit so hell yeah for staying strong. you da man!

[@milesw3720]

I love the energy recently, edits too! Congrats on not vaping Mike!

[@jewdLaw]

LOVE that ya’ll broke down the header build. The old school rotary community that I grew up with kept everything a secret. Most of us hated that about the community. Also, rotaries kill mufflers lol. Get a universal muffler from Racing Beat or Mazdatrix ❤👌🏻🤘🏻

[@hardspaghetti9989]

LOVED the format of this video, great job LZ crew

[@YTias]

DAMN 4K ADAM LOOKING NOIICEEE ;) @ 13:03

[@throttlepinnedatvsxs]

Sounds sick man! I like all the effort you guys out into trying things!

[@jeremycook5836]

A classic rotary trick for the big flame shooters, is to replace the packing materials in mufflers with lava rocks because they’ll withstand the heat, and porous enough to absorb sound. If you don’t need that much heat resistance you can also use stainless steel wool. Just something to consider trying.

[@Berm_Blaster]

Sounds like you have rocks in your muffler

[@jeremycook5836]

@ lol nah, I don’t have a rotary. Just a Miata.

[@Alex9_72]

It definitely sounds better but I think the stepped header will add to the sound more. If you look at most race cars, they all have stepped headers even the 787b. Header tuning has always intrigued me so its cool to see you dip your toes in it. Love the videos sir

[@rjaybruhh]

*_There is literally a video on KZbin a guy made called_* "How F1 Sound Is Made" It's about how he got his 4 cylinder to sound like an f1 car

[@troyderks899]

For the Europeans, Cerakote is also available at JClassics in The Netherlands!!

[@alexbatista1119]

Adam I’m not a bot i promise

[@Thekurlandboy]

Sounds like something a bot would say.

[@AdamLZ]

Bots are getting smart these days

[@DIESEL1JZ]

That’s exactly what a bot would say

[@connoisseuroftigolbitts]

I am a bot LZ BOT BABY ❤

[@park0rdie]

Lol

[@morschgaming]

Hell yeah, let's go! 4 rotor sound is amazing!

[@jarrodmcleese]

Why can't we win your give aways in Australia. Imagine the irony in winning the Evo and having it back literally 3 streets from where it was stored for 3 years haha. Love the new vids. I am not a bot

[@fredericoespinoza]

Because it would cost them like 6-8k to ship

[@EkaiMin]

@@fredericoespinozaNew Zealand is able to win the giveaways though

[@TIGAesthetics]

love to see the education on back purge! thanks guys and keep up the great work!!

[@salemalslamah]

Still needs stepped headers it'll help with the flow and keeps rest of the system cooler and sound way better

[@maxxrelax88]

Agreed, each step splits the sound wave increasing the octave each time

[@dantejimenez528]

Yohan you definitely out did yourself! That's one hell of an idea since you didn't have a vacuum chamber with a purge table, but you made due!!! (Hell in my opinion I think you need a raise ha and a fancy vacuum purge table for titanium Tig welding! Great to see another very experienced welder in the field and showin off the craft!!)

[@deanojalapeno]

Hey Mike, I stopped vaping 2 days ago, it's not easy, (especially being used to 50mg Nic salts), but I've been wanting to quit for a while now, when I heard that you quit I thought "well, sucks to be him" but then at the same time I wanted to quit too, so yeah, now we're in it together😊

[@JonathonDelumyea]

Ya I quit the nic salts bad for you and switch ton just regular Marlboros never been happier lol

[@christopher5255]

​@@JonathonDelumyea"vape cause water in your lung" dude stop vaping and switch like that for king seize smoke juste to get a dose of nic 😂 and you have smoke at any store ! Just better 😂

[@MikeDawson1]

i quit vaping 5 years ago, and just quit coffee and caffeine 5 days ago. it's a wild ride

[@heavytank2]

I could listen to this dyno session all day. That exhaust is AMAZING. 💪💕

[@seanchurchman5785]

Well done on not vaping Mike!! 👍👊

[@JosephJonesboy88]

Bro I really like the 4 rotor Supra, I wasn’t feeling it at first but the video you uploaded of it drifting 100+mph entries and leaving insane smoke trails it completely sold me on the rotary swap! It does sound even better now too but definitely throw a headphone user warning in there next time 😂

[@cingkole7893]

4 rotor vids >>>>> also 4K is sick!!!

[@HellcatDreaminJosh]

Adam LZ Awesome Video I think your 4 rotor Swapped MK5 Supra Drift Car sounds absolutely incredible and I can't wait to hear it in action

[@aaronelliott413]

I mean 500 HP out of a 2.6L NA car is crazy!!!!

[@arthurschulmann]

Acoustically speaking, my guess about your exhaust system to sound like f1 is: - Stepped Headers 3 mm increase each step (this is not that necessary considering that rotary engines normally produces twice the frequencies than a common 4 stroke engine) - Circular/rotational firing order at the merge collector - 30° up to 45° V angle for merge collector for more sound deflection points (for performance this angle must be up to 15°) - Thinner pipe walls (for more resonance) - 304 Stainless steel or other material with reasonable hardness ("soft" materials like mild steel muffle the sound) - Not too large diameter throughout the full system except for tail pipe (large diameter enhances loudness but tends to accentuate the lower frequencies) - Not too long piping too (the shorter the pipes, higher will be the pitch of the exhaust) It's more about managing shockwaves than any other thing

[@PROBL32M]

4 rotor in 4k is crazy work

[@brown.boy_yash7329]

LZ Science is what separates this channel from 90% of other youtubers.

[@natek4139]

2:24 cracked me up

[@m.z.duchow2487]

Same 😂

[@WheelsRC]

Great video, love the quality 4k 👍 well done Mike for not vaping. The Supra sounds great.

[@sleighridefishing9027]

Doritos needs to scream like the 787B!

[@SIMMONSx22xPOINTx0H]

Happy to see more 4K options. Thanks, Mike.

[@SIMMONSx22xPOINTx0H]

Literally as soon as I made the comment I looked up Adam's nose💀 I'm excited too, Adam, pls don't kill 4K uploads 🙏🙏

[@chris_f_eden]

Good job Mike

[@bruntwaffles7292]

Need them velocity stacks that adjust length thru the rev range same as the 767b

[@hdoglesby]

18:04 Adam: "So you think it melted that angle hair?" Editor: Missed opportunity to clip in the shots of fireballs coming out of the exhaust from the last video

[@thebuddstud]

Great job, Mike! Currently 2 days nicotine free myself, and it sucks rn. Also, lve the 4k res!

[@johnnykthe1]

Would love to hear what people think of Adam’s 4 rotor sound compared to the sound of my 4 rotor which is also Na. I have some videos on my channel.

[@nightkingzz784]

holy, that one sound so good! like its a mix between honda K a and 4 rotor... perfect

[@EZ2NVDon]

I'm glad this came up on my feet today. Unfortunately, my wife's complaining about the drool puddle that I made on the countertown, because I have a n 1988 f c two rotor, and i'm rebuilding it for turbo. I do like say unique rotary sound, and i'm too much of a noob to do much else. But four k videos like these really enhance the experience. And show me the potential without having to make a twelve rotor. I think it's crazy, sick that this can be funded by selling apparel. -9 to 5er

[@chris_f_eden]

Let’s goooo….brap brap brap

[@Kyla_Weaver]

Mike is the best cameraman, as evidenced at 21:43. No running, no swaying, just concentrating on the shot. Plus, cameraman never dies, so he's good.

[@Not_A_Cat]

Copy/Paste comment bot. Stolen comment. Block the bot.

[@Not_A_Cat]

Bot. Copy-pasted someone else's comment.

[@WigneyR]

6:25 you can get the lengths of each header a lot easier by taping a piece of string along the outside of each header in a straight line but taping it flat to all the angles, then measure each piece of string.

[@MasterTygt500]

Love watching the content of perfecting exhaust sound. You have slightly improved the 4 Rotor's sound, but it is still not close to there. Still has the same undertone. Can't wait for another video of really trying to get that perfect 787B sound.

[@florianrueger]

The livery is soo nice I can't get enough beauty shots of the car. Also I think it sounds close to current F1 cars. Can't wait to hear and see it in action 👍

[@tuisautaleilua133]

4 rotors always sound sick asf, it's a given with the A90 Supra, cannot wait to hear it on full song again, full lock and on full throttle, FARK YEAH!!

[@Barney_617]

I'm 32 years old, i have no business laughing like i did every time you flipped the camera when Johan said penetration 🤣

[@1990Redline]

Love this more vlog style video WAY better! 👍 Also the sound is SICK now. I even liked how it sounded before tho. But it's not too much F1 high pitch but it's just right with a good amount of growl. 💪

[@vanjabi8827]

Matt Field’s C8 8-1 sounds like absolute perfection! Note: Getting the firing order correct into the collector definitely made a change in sound for the better. Keep pushing!

[@GageRutherford]

The vibes on the channel have honestly been dope af lately (good job Mike for not Vaping)

[@fillman86]

that does sound a lot cooler, and I'm excited for it to reach f1 pitch once you put more than 1 step in

[@davthompson]

quality is sick, loving it!

[@MrSloanball]

The "stones" in the muffler is from the fiber packs and are caused by vibrations. I worked for a Tier 1 and had the same problem with S550 mufflers prior to the 2018 launch

[@TomBudin]

i actually really liked how it sounded in the last video

[@zerri08]

Mike keep up with the good work! I love your editing

[@Mattscalf]

Congrats Mike on quitting. I also just quit smoking. In the car sounds freaking amazing!!

[@dangerm3496]

The progression of LZ is PHENOMENAL!!!

[@ryeguy88]

Spotted you at the NAMM show dude! Good to see you peeping all the guitar gear!

[@RealChallenger850]

So proud of Mike for quitting!! I just quit myself back around Christmas time, you can do it man!

[@GeenIdee2]

The heat out of a rotary is crazy. I made a repackable muffler for my rx7 for this reason. The end tip changed color after a couple of laps on the track. Your end tip might be a bit short for the amount of flames it shoots though

[@zephhattan8008]

I think this only really had an effect because the "merge collector" design was basically missing the merge portion in the first place. You effectively were mostly dumping sound waves into an expansion/echo chamber asymmetrically, and as you point out in the video when this is with 4-1, that also introduces a sequential difference in the relative spatial relationship of the pulses. Fixing the order so that the relationship between each sequntial pulse remains the same is one way to address that but really only addresses half of the problem...but it wouldn't have been necessary, or made any difference if they actually merged symmetrically to the centerline in the first place. With 4-1 there is always going to be a bit of asymmetry in that relationship between individual runners unless you are merging clear down to the same ID as the individual runners. Which is ok in a 3-1 since there is usually no event overlap, but would no doubt probably cost some power at least some places in the powerband in a 4-1. I think you're also rationalizing the whole 2.5" path length difference by it being a small percentage of the total length...but I should point out it represents the same difference in sound wave timing whether it's 100% of the runner length or .00000001%. I think you would have a smoother sounding result if the runners were exact equal path length. 2.5" is not negligible. If your EGTs are say 600 degrees F, those sound waves are traveling 1595.4 feet per second, or 19,132.8 inches per second. So that 2.5" difference takes 19132.8/2.5= 1/7653.12 of a second, or 0.13 milliseconds. Which doesn't sound like much and in fact even at high RPMs may only be a 10% offset in events relative to the total exhaust duration but most of the exhaust noise is generated over a much, much shorter duration when that path first opens, so the delay likely produces a much larger percentage shift than implied. But in the context of human hearing, even .13 milliseconds is ~7,700hz. Well within the range of what we can detect so I suspect the timing difference does dirty up the perceived exhaust note in terms of less smoothness due to the inconsistent intervals in timing, as well as in rapid fluctuations in perceived volume due to the different event overlap it generates, no matter how small. If those path lengths aren't identical, their interaction will always change as engine operating conditions change. The higher frequency you get to the less we can probably detect it, but arguably the more it actually matters since the offset becomes a higher and higher percentage of the exhaust event duration. I don't think you've solved the puzzle as a whole, or introduced adequate frequency multiplication techniques to really achieve the aound you are after...but you did identify and address one major flaw/obstacle. Would look forward to seeing this replicated with exact equal lengths, as well as the effect of creating some frequency multiplication with stepped primaries, or dead-end branches as resonators on the primaries to split the sound and purposely create an echo/delay (but those will need to be equal length and at equal location as well, or you run into the same changing timing differences/asymmetry as well).

[@FCustureri]

For more reference on how these dynos read, last year I had a LS3/6L80E car on a Mainline ProHub. The car was factory rated at 415hp. Stock it made 335hp, with just a tune 350hp, and then intake/headers/tune 405hp. 490hp on a Mainline is strong!

[@NotBuff]

Mike congrats on the journey of quitting. I myself have quit too. I’m almost one year free! Keep going!