This will make YOUR exhaust sound AMAZING. Custom exhaust builders share fabrication secret!
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- Опубліковано 10 тра 2024
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On a NA car should this be installed after or before the ressonator?
Love your content
Thanks for offering these, looking forward to experimenting! Your website says both megaphone and megaphones (plural) in the description , so it's not clear to me if they come in pairs or a single megaphone when I try to buy, may want to say "single" or "pair" explicitly. Also, have you experimented with one on a turbo 5 cylinder like a TTRS 2.5T?
Great editorial. Thanks
maybe that‘s exactly what i asked for in my Corvette. a deeper, more throaty mean sound. i‘ll give it a try.
Imagine buying a $120,000 v12 sport car and it sound like a Toyota Avalon.
the thing is he bought a 120,000 v12 luxury car
This is why a triumph motorcycle sounds so good it’s the cone exhaust that all the flat trackers run.
It is also the crank design and engine design .Like a mustang gt500 with the flat plain crank .Hell even a base 5.0 GT sounds killer. The 4.6 3 valve mustangs sound amazing!
The basic exhaust note begins with the cylinder head.
The firing order.
@@jmetalsmith1362 Doesnt really matter but also it kinda matters, only reason why firing order would matter would be some (as an example) of the V8 engines firing 2 cylinders on one side right after each other, but this can be smoothed out by adjusting runner lengths and you can also see the effect of adjusting the runner length on dyno as few extra ponies in most of the cases. Equal length isnt the thing, its getting the exhaust pulses out at equal time and hopefully in equal velocity.
"brands of oil to never use in your engine" 😂😂
This one trick mechanics don’t want you to know?
I was just about to comment this!!!😂😂😂
The oil geek on YT can help you with your question.
1) vegetable oil
Liquid Moly 🤘🏽🤘🏽🤘🏽
Having made a few DIY exhausts on my driveway with the car on jackstands, I know how much work goes into it and how tricky it can be to get it all done perfectly. You guys are very inspirational
I made my seabird sound like a 2 stroke..
Replace resonator with glasspack, install Flow tech raptor with a farm flapper and add some very poor welds..
Boom you have a two stroke sound
That exhaust sounds more like a Hellcat than an actual hellcat. What a demonic scream that things got. That exhaust fits that engine perfectly! Amazing work
Not even close.
You must be listening to SXT and GT package challengers and chargers with hellcat badging on em. Those guys like to up badge their crap and think they're fooling people
This channel melds gearhead knowhow, with the intricate disciplines of raw science.
Your oratory presentation was quite polished, & professionally articulated. Great video!
Thanks for the view
I haven't been to school in 20 years. Watching this video felt like the first day off school. I'll be watching this video 3xs a week . Great video
Dude is BRILLIANT yet refreshing in a sense that those I’ve met who purport brilliance try and convince you they’re just that, seemingly always breaching that condescendence. O.J. obviously strives to teach and does so in a humbled manner. Cheers to O.J. and his FMU family-literally his family!
When you work hard on a video to try and convey that all the fancy engineering on earth isn’t more important than actually building something to see how it turns out… comments like this mean a lot. Thanks. I’m just trying to get people to understand while you can calculate these things into precision with unlimited time and money… you can also just try it out with a few guidelines and get great results.
Totally attainable for most geahreads without a degree, so don’t get intimidated by those who say otherwise!
Appreciate this.
@@FluidMotorUnion Hi. DIY car and audio guy here. To help you ballpark your tone I would use a 1/4 wave resonance formula to measure the pipe length for a specific wavelength / tone
You know how you can tell if someone is an engineer? they'll tell you.40-50 times usually.
It took me 13 minutes to realize this is mark rebillet’s older, smarter brother. In all seriousness, thanks for explaining things in the way you do 👍
Wow. The education here is unmatched. Well done!🎉
You can overthink anything.
Factory exhaust is cheap ,is restricted and lacking a good sound. However the entire reasons for factory exhaust is to meet production cost , epa standards and federal dot safety standards. It’s not that they don’t care it’s that they have only so much room legally to get 600 horsepower on to the highway. Like a hand gun . Can’t buy it with the extended mag . That’s a customer option 😉
Years ago I had a 5.0L V8 with a single 2½" pipe. It had an expansion chamber near the transmission (very similar to a Catalytic converter that had it's insides removed), then a straight through pipe through to a rear muffler. It sounded OK, but I started experimenting and hole sawed another hole next to the muffler tailpipe into the Helmhertz chamber at the back of the muffler. This hole lined up with the internal perforated pipe inside the muffler, and I inserted another short pipe into the hole and attached it to the existing tailpipe with hose clamps so that it could be adjusted to insert into the muffler chamber by different amounts. My mate and I took turns driving WOT and the other listening as we drove by. We adjusted the length of the new tailpipe until we got the best sound, then welded it in place. The results were amazing. Not super loud but more like a sub woofer effect, especially at idle. I guess it may be due to two out of phase sounds being produced? Strangely blocking either pipe had the same effect at making it quiet to about the same noise level. I had many people ask me who built the exhaust.
So my question to @FluidMotorUnion is, have you tried placing the megaphones in each pipe at different locations to each other. ie, one close to the engine and one further to the rear.
Or, placing them at close to the same length, but making a sliding connection on one so you can adjust it along the pipe by a few inches and move it slightly to experiment with different positions along the pipe while ethe other one remains in the same place.
Please tag me if you try this, as I would be very interested... even though my revhead days are pretty much behind me.
This was a really interesting discussion of the concepts behind exhaust systems.
Megaphones obviously made a difference. Early in the video "truck exhaust" was mentioned and I believe not positively. If I had to give a one word description of how this exhaust ended up sounding was like a truck, maybe the best sounding truck but still a truck. Like a big block with big cams not a Pagani exotic or exotic in general. Regardless of the result the information packed in this video is excellent and really appreciate the detailed breakdown.
Yeah, you're not gonna get short length quad exhaust sound from a long length dual exhaust.
19:00 As soon as the no megaphone dyno pull was done I audibly said “holy fuck” LMFAO
the sound difference is CRAZY
_What a difference OJ, kind of like hitting the bricks in the gym. The more you structure your workouts(and yes to some, increasing the weight), the better the outcome(insert: OJ Lopez's physique). Hence, the more you fine-tune your 'custom' exhaust, the better your baby is going to sound(and yes increasing horsepower along the way). Side note: your delivery is getting more natural for the camera, damn good job all the way around._
You know you are in the 21st century when a garage shop video about exhaust delves into FEA and the physics of pressure pulse scavenging.
Wonderful discussion.
That thing sounds insane now.
That original exhaust it came to you with is shocking for a car worth that much! Mild steel, crush bends and mig wire hanging out. I would be embarrassed giving that back to a customer. Fine on a 25+ old car but not on that
It’s way more common than you think. Although, our view is skewed because we are known as a place that will fix your bad sounding exhaust choices… so maybe that’s why WE see them so often?
It's crazy what stuff comes with. Even quarter million dollar + cars come with the MIG goobers nowadays lol
It is subpar by Mercedes. That price, spec level and performance they should at least look good. Carry on what they had going from the headers, mandrel bent 3" stainless-ish pipe isn't going to break the bank
People who think they can weld should be given a weld test before continuing on the exhaust
@@user-nf3oq2ge3gfuck it we learning
Probably the best sounding Merc v12 Biturbo I’ve ever heard.
The best sounding one on UA-cam is Effspot's old v12 merc imported from Japan. It sounds like a Ferrari v12. It custom headers by some Guru in Japan.
@MegaPixie666 who built his lambo exhaust?
I don't know, probably yourself
Thanks for the advice on my corvette! I appreciate the sheer amount of knowledge you have on fine tuning these exhaust systems and I especially appreciate you taking the time to share it with me.
Let’s goooooooo. Alex better have gotten his push ups in!!!
Screenshot’d this comment to bully him with 🤣
@@FluidMotorUnion haha nice!!!
Amazing work OJ, usually these videos don't keep me engaged but your diction and knowledge are unparalleled. Keep doing what you're doing.
Just a few notes... The results you got are great 👍. As a muscle car guy I was afraid of it sounding like an open wheel indy/f1 being that it would have even firing banks and so many cylinders. This is actually better than what I was expecting. But if you wanted an exotic f1 sound or to harmonic tune the engine it would be easy without megaphones which the math of those seems to be a guarded secret. On 2 strokes they are often regarded as sound wave reflectors but when glossed over in automotive exhaust literature they talk about sound wave timings extensively but then some may say megaphones don't follow the same mathematical model and require testing. Not sure why that would be but darin Morgan who designs intake systems that also use sound wave reflections talks about angles as part of the rpm range so perhaps the reflections aren't a function of the average length to the cone and just happen when acoustic impedance sufficiently changes so I don't have enough acoustic knowledge to speak on that. But I do know how you would typically tune collector extensions and primary header pipes when megaphones are not involved. Sometimes the path to the best x or H pipe placement is blocked but because it's harmonic there may be subsequent locations down stream. These down stream locations may be lower in pitch so if an f1 type sound is desired you may need to pinch a harmonic (ask a guitar player about string harmonics) to make it high in pitch if you so wanted to. To do this you could add a stepped pipe or an H or x at a half or third or quarter point in the path getting to the tuned point. A typical location for a x would be around 33" behind the end of the primary header pipes for a 6500 rpm engine, it depends a bit on gas speed (the back wave might be delayed in time more than the forward wave time is decreased by gas flow changing the exact length a bit from standard organ pipe math) and temperature. But if that's obstructed by the transmission or transfer case or cross member you could go around 67" with an H at 33" or 16.5." the x on many cars would actually be better placed near the rear universal than as soon as it fits by this math. Shorter for an 8000rpm engine and longer for a 5000 rpm engine like a stock cam or a long runner efi manifold like Ford and Chevy used in the 1980's on tpi and 5.0/5.8l engines. Those numbers are for 8 cylinder engines, the numbers for 12 cylinders may be shorter. The more pitch you want you would divide the distance to the x by larger whole numbers for additional reflection points. A guy who built a 5.0 Ford (yes classic 5.0 not Coyote) powered BMW for budget racing built a 180 degree header to get equal pulses and a super car sound. It worked but this type of build often forces you into primary pipes that are too long. It might work on a 5.0 because the intake is also very long. But it's not always best. So he then replaced the hand built headers with equal tuned length headers and used a triple x pipe to get the super car sound. So he had a pushrod V8 with odd firing banks not known for that high pitched howl and extracted that sound from it on a full length sedan simply by pinching harmonics using redundant x pipes ! Long pipes tend to mean lower pitched rumble but it can be manipulated easily by causing intentional reflections at equal interval lengths.
Awesome info. Is there a source I can read into this more on?
OJ i take back my mean and negative comment on the last aventador video... You did a great job bring out the sound on this one!
I liked the comment!!! But we didn’t build that one for sound first was my main point. If we did, it would have been a different plan of attack.
The goal was to try to affect a performance vector I think no one else had taken advantage of- the sound was questionable because we had never done it, but optimising scavenging via order, would only benefit?!?
So it was kinda let’s try THAT and see how it turns out. But it made power so mission accomplished! Happy to still have your vote of confidence on our ability to massage out good sound, it’s just two different goals.
Wow, that's an amazing tone\sound coming out of the back and you still hear enough of the turbo induction noise as well. Perfect balance of both. If there's no drone then that's actually the perfect exhaust!
Just changing the outlet tip can make a difference.
I have a 2000 silverado with flowmasters. It had dual 2.25 outlets. Changing them to an oval changed the tone. Megaphone of a sort.
Ditch the flowdisasters and get some straight thru style mufflers. Sounds way better
i love that you guys focus on tone and sound quality as much as you do performance/flow. i might have to take my Thunderbird SC with a custom single turbo setup to you guys to see what you can do with another infamously truck-ish sounding engine, the Ford 3.8/4.2 V6
We’re ready when you are!
Congrats on the big 30k subs! Here's to a million more!
@LegitStreetCars Maybe this video is a sign to get megaphones on your CL65 😃
Samcrac said he can build u a custom exhaust for the custom supercharged AMG using tin snips, jb weld, dryer vent tubing, coat hangers, zip ties and a trumpet he found at Goodwill for a whole lot less than what this fancing talking city slicker will charge u.
OK, I Was Very Skeptical. But That Sounded Good, I'm Impressed !!!
Having witnessed the result of your efforts on Alex's LS swapped 911, I'm more than convinced of what you guys are capable of. That thing sounds absolutely venomous.
Wow, it's the first time I saw your channel. My goodness, you're a very detailed person. Great explanations too.
Fantastic video! Ever since tuning 2 strokes with expansion chambers, i always wondered why there wasnt more exhaust tuning for 4 strokes... scavenging, pulses and waves have to account for something.
FMU: we’re telling you our secret because the only way you’re going to be successful with it is if you have all the equipment, resources and experience we have.
The car sounds great by the way
My Subaru has 2 mega phones on 1 pipe the expansion chamber for a 4 stroke or the power bomb in the fmf world but this is the key to tuning your exhaust tone
Damn , that sounds really good, couldn't believe what a HUGE difference that made, and to be honest I wasn't expecting it. Great video, and thanks for the cheat sheet 😁
If you think of the exhaust system as a wind instrument it gets significantly easier to understand, in fact there's a German channel that did an experiment with brass piping to further prove that point...And it WORKED...But it was a slight difference in sound albeit a pleasant one.
Interesting concept using the megaphones. I'd love to see this tried on an already great sounding NA engine, like a LS7. It would also be interesting to try using the megaphone and reducer going into and out of a high-flow cat system. That might flow better with a smoother transition into the inlet side/face of the cat, and the cat would tend to straighten the flow/soundwaves, before reducing back to a traditional pipe side. Only concern might be getting the cats close enough to the engine with the megaphone... But using the C6Z example I mentioned, I think one could place them in the early part of the tunnel with success. Could be interesting to experiment with!
I have a c6z & kooks with their high flows. Check out HJS catalytic converters. They make what u want, no experience myself but I heard they the best.
That was very educational, feel like I should have took a test and got a cert at the end.. Thank you for taking the time to explain.
Fun fact a expansion in the exhaust like that creates a pressure wave that pushes backward creates back pressure thats why 2 stroke engines need that and thats why i know lol
Craziest Benz I’ve ever heard wow!
Jaw dropped when you revealed the exhaust with megaphones. Amazing work!!
Amazing info as always. Thanks for sharing your knowledge, and displaying the talent level at your shop. Impressive!
Thanks!
my goodness this blessed my monday morning ! sounds great !
So glad!
I've used megaphones in a couple.of builds. Actually used two to build a tailpipe on my 16 wrx. Used 1/4 inch rod every 90° on the outside, counter sink holes drilled through in a helix pattern. It was then inserted in the outter cone and I cut exposed section the inner cone roughly halfway between it's end and the end of the outter cone. It was finished with a 45° cap and mounted about 45° out from facing down. It was an expansion from 3inch to 5inch. It turned out exactly as intended too, deepening the tone, cutting engine noise and allowing the turbo noise to be more pronounced.
Dope, thank you sir. I will try this one day when I buy my first welder. You are awesome
Good luck!
Totally awesome, now I'm not a big budget dude but I appreciate the sound and I'm looking at my Jaguar XFR for both power and noise upgrades in the exhaust, the builds that FMU does makes for great inspiration. Cheers team.
Hopefully it’s something you can try and get into your next system without being intimidated by those who say you need to be an engineer 😂. Try it see how it sounds, move it, try it again!
Ha I have been fabricating an exhaust for my Ford Sierra xr4x4i (Ford Merkur in the US, as I live in New Zealand) and making changes to it and not being a competent welder and hence practicing on the Sierra, but since I'm into building my own I take inspiration from your works. But once I get the welding done then I'll progress into my more advanced cars.
Thanks OJ !! Thats the real deal !!
I’ve had a Corvette C5 for 6 years. 180° headers 8 into one equal/unequal headers. all the major muffler companies. Doesn’t give me that exotic sound. I would love the car to have a hint more of. Definitely look into megaphones more might be what I’m looking for and keep me EPA compliant here in Cali :). thanks for the overview great video and insight
After watching one of OJs videos, I feel like I need to raise my hand to ask a question. Great job OJ !
Sounds much better than my S65 did. Would like to see you guys test the Brilliant Exhaust merge pipe on these as well. Same style merge that Gintani made popular on Aventador.
Here’s some secrets: the X-pipe goes a lot further in creating a higher pitch exotic tone than a megaphone, wonder why that wasn’t spoken about in this video. Post turbo scavenging is minimal, so its incorporation in this design isn’t for power. And what about drone? The megaphones aren’t doing anything with sound cancellation and the natural NVH of the engine fully uncorked definitely creates drone at stop and go driving speeds. Full throttle sounds are initially exciting, but you live with part throttle rpms with a street car. Full throttle tones make you fall in love, drone leads to divorce.
That sound is awesome!!
So much information in one video. Very clear and easy to understand
Glad it was helpful!
Very comprehensive approach to performance and sound. Very well presented and to the point. Keep up the great work!
You guys did a great job, that thing sounds so mean now!
Success!
Regardless of any subjective choices and fluid dynamics theory, it would appear that you do top-shelf exhaust system fabrication. Very, very clean and tidy, sirs. Well done!
Two cycle dirt bikes have this, it's called an echo chamber. Clean work, man! Looks good! Sounds Great!
I think it's called an "expansion" chamber!😂
Been seeing you on YT for awhile thanks for your knowledge bravo always
Welcome!
The structure and presentation on this video surpasses a lot of your others, bar none. While certainly educational as are the others, this one seems less rehearsed and is truly OJ pulling knowledge from his back pocket of expertise. Great video!
Loving all the content and the detailed explanations:)
Good rule of thumb! Thank you for sharing!
Great information! Very interesting and looking forward to following the development of the system!
Great overview! And that S-Class sounds like a monster.
A megaphone helps match the acoustic impedance of the tube to that of the open air. That results in more acoustic energy (pulses) leaving the tube. That’s why musical wind instruments have bells. So adding a megaphone on the final tube reduces scavenging.
As you state, finding a gratifying sound while getting decent power boils down to a trial and error process. Unless, perhaps, one uses software to simultaneously model both aspects.
Such software is definitely possible. Similar modeling software is in common and regular use in, say, electronic design.
What software apps are out there for exhaust systems? Are you using it?
Thanks!
And, wow! That upgrade you did with the turbo equipped engine sounds absolutely awesome! Wow! I’m sure your customer loved it!
Dang I learned so much!!!
It sounds like a dragon now.
Once we install the larger turbos and dial in the tune maybe it'll breath fire as well ;)
Reminds me of brass instrument design obviously. One thing about brass, something like a french horn gets its characteristic smooth tone by having tubing that tapers over its entire length. Perhaps stepped diameter systems could replicate this? Ultimately we're talking about impedance matching. Look at how a compression driver is designed. A compression driver in free air isn't very loud, because it doesn't have much pressure to work against, where with a cone on it it can pull more current and really kick sound out. I suspect the megaphones are doing something similar, though I'm not sure how necking them back down effects this.
Beautiful explination and now it makes me want to try it. Obviously cylinder count has SOOOOO much effect on the sound and so does displacement But it would be awesome to figure out a formula that can closely give you an idea for how much length and size of the megafone for a specific sound range. Wonder how well itll do on a 3L twin turbo V6.
Excellent,sounds beautiful
That thing sounds amazing nice.
This guy is an excellent host! Really knows his stuff, great video
Sounds way better!!! And great work!!
Thanks!!
Would have liked to heard the same before & after tests to really compare the sounds. I understand that may be challenging with a customers car but ideally it would help for sound comparison. Thanks for the video!
I made a pipe for my Honda QA50 out of a mid-century cone shaped table leg, it sounded awesome.
Watched whole video intrigued💯
Top notch video, thanks!
I just rebuilt my Jaguar s type r . I have room 3/4 way down after were the resonator was . I already sent this to my buddy who is a professional welder . He gonna fabricate two for me and I'm gonna bolt them on . I can wait . The exhaust sounds decent now but I wasn't satisfied 100% this willale a huge difference I beleive
Ooh it sounds so good
That sounds awesome.
Amazing speaker!! That looks like could be a US Navy Seal Masterchief!
Bitchin info... I worked in R&D at SuperTrapp/Kerker fabbing pipes for bikes for many years... Besides the dyno the flow bench was a good way to find what worked and what didnt muffler flow wise. Divider plates, pulse converters, stepped pipe crossovers....all in a days work. It was really fun working on systems for the H-D flat trackers or tuning on the dyno when they were in the area. Also, working with EPA, EEC, TUV and JMCA you really learn what it takes to extract some HP without exceeding their restrictions of Db. Fab On !!!
With the drawings on the dry amd erase board, it somehow reminds me of motorcycle exhaust system.
24v Vr6 vw is still one of my favorite sounding cars
Yes, that and the Audi 2.5 5-cylinder. #1 and #2, you pick the order.
I agree, And I get to drive one every day.
Superior exhaust work guys!!! Love it!!!
I’m going to try it 😊
You are really smart, i figured some of this out just reviewing thousands of exhausts on youtube and referencing designs when i was younger. I would love to see a video from you explaining the inherent parts of engine design that play into all this since i doubt you aren't seasoned on the matter, why for instance some single cylinders sound so amazing (its rare but they are out there) and others not so much. It would be cool to see someone so passionate put that knowledge out there because i don't think people know anything of how the vale sizing, arrangement, ports, all that play into it but it shares SOME (if not exactly) similarities to much of this.
A interesting side subject is how much some exhausts sounds have suffered due to price cutting + emissions, hope its not controversial but one of the best examples of a fantastic engine but a tragic exhaust port imo would be the Honda K20, its not just the sound the same things that lead to it not sounding as brilliant as it could are what cause all the destruction you constantly see with it, reversion issues, but to best i can tell (since many race and bike engines with similar extremely efficient designs) is such simply because it works with stubby tight bent stock headers and lights off cats quickly, just wish it wasn't such a fundamental thing that if not impossible is almost impossible to be changed.
A fun accidental effect similar to what you guys do can be seen on some 2GR MR2s, if you search sounds like f1 it comes up. I think this is all one path though, the high flow minimal diameter stuff imo CAN sound brilliant more like a 60s race car, but the megaphone stuff in general is just a great way of tackling these things given the limitations everyone faces. 80s Alfa GTV6 many years ago sent me down all these paths.
Any testing with the megaphone on diesels? I’m glad I came across this video, was actually thinking about design based from afterburner exits.
I bet they could make my XB sound like a formula race engine with a single megaphone and some wood glue.
FMU is amazing!
Sounds like a possibility!
Damn, that was fun... 😁 Enjoyed !!!
sounds good
thank you for a great video and for sharing your hard earned secrets. the only video i've seen like it.
can make even higher frequency, just stack two sets of megaphones. the principle works by creating a expansion of gasses, which slows the velocity, and then a partial collapse to speed up the gas. gas sped up, for a given pulsation, will increase in frequency, therefore appear to higher pitch.
Making a cts-v style x pipe for a silverado so i will definitely try to incorporate a set of megaphones in.
Great video, would you recommend megaphone on a 4 cylinder na car? If so does it need to be far back or further forward to get a higher pitch?
Love this nerdy stuff. Well done! SUB'd!
Thanks for the subscription!
Loving the knowledge OJ
I'm so inspired !!!! That was a lot of fun to watch and learn of your process of thinking. If I may be so bold as to make a suggestion. After watching this, I believe the tone is calculable. You where very right on your analogy of comparing exhaust pipes with that of church organs. There is a whole wonderful world of the science of acoustics. I will guess the rest of the exhaust industry has done what you have done and experimented with trail and error. BUT the 'megaphone' as you describe is, in the world of sound, a transformer, as is the whole pipe for that mater. Think of a musical instrument like a Trombone. The length will dictate what frequency is accentuated. The shape of the bell and resonating materials themselves , will affect the "tone". What I am excited to ponder and experiment myself with, is the measurable changes of under the fluctuating changes of air in the pipe. To measure pressure, heat, compression and any other variable and compared to results would be so amazing. I am now, after this video, seeing the exhaust as nothing less than a tunable musical instrument. One to which you can have a calculable result, once you discover the variables to the formula. I am not going to sleep tonight lol. Working on my own custom car, when I do some experiments I'm going to share them with you guys. Thanks so much for this post!
Awesome content and informative ❤🎉😊
Glad you think so!
Nice work 👏