Performance Clutch – Explained

Performance Clutch – Explained

hello everyone and welcome to this week’s video today I’m going to be talking about performance clutches now if you haven’t already watched my video on clutches you may want to check that out first that said it never hurts to see the real thing so I’m going to kind of review in this video and talk about how a clutch works as well so just kind of get your bearings we’ve got the engine engines connected ultimately to the crankshaft which is connected to the flywheel and connected to that flywheel we have the pressure plate inside of the pressure plate diaphragm spring and then the clutch disc here so that’s what we got drawn here and an oversimplified a clutch pedal and then the throw out bearing which presses on the diaphragm spring so let’s take a look at an actual clutch so here we have a única performance clutch for the Acura Integra B series motors and I’ve got a product link in the description if you like check that out so anyways what we’ve got here is this is the pressure plate the red painted pressure plate in the center we’ve got the diaphragm spring so this is what you press on to release the clutch and this is the bearing that presses on that so this is throwout bearing and basically it can absorb a thrust load and rotate like this and then it will press on here in order to release that pressure plate from the clutch disks so inside you can see here’s a wire ring in the inside and that’s basically the fulcrum of this diaphragm spring so as you press in it lifts this pressure plate back and removes it off of the clutch disc so this will be these holes here basically where this is going to connect to the flywheel and then inside here you’ll have the clutch disc and that’s what this will ultimately be pressing up against and pressing this against the flywheel in order to transfer torque so there’s really three main differences between a typical om style clutch versus a performance clutch one of the first things that’s going to change is the clamping force so the clamping force of this diaphragm spring is going to be much greater on a performance clutch in order to transfer more torque so if you haven’t watched my video on multi-plate clutches I kind of explain how you can calculate the amount of torque that a clutch can pass through the transmission so you may want to check that out but basically this has as a 1800 pound pressure plate that’s about 45% more clamping force than the OEM style clutch so that’s going to give you about 45% more torque that you can transfer through it the second thing that a performance clutch is going to have different from an OEM style clutch is the material of the disc so this particular clutch this Janaka performance clutch disc uses a copper ceramic material rather than an organic material like most typical clutches and basically the reason you’re going to use a copper ceramic is that it can absorb a good amount more heat it maintains its performance at higher temperatures than a typical clutch or an organic type clutch so you can kind of beat it up a little bit more you can you know I’ve used it on a track and it’s still going to work unlike an OEM where it might kind of start to disintegrate once it starts to get warmer and the final thing you’re going to look at on a performance clutch is it’s going to reduce the surface area of the disc so you’ll see here that it’s got these pucks six of these pucks and different styles will have a different amount but basically what you’re doing is the clamping force will remain the same on this however the amount of pressure on each individual puck will increase so kind of just some rough math here I just kind of said that these were about two square inches and this is about a square inch here so overall we’ve got about eighteen square inches of area of if this were to be a full circle clutch disc so we’ve got a pressure of eighteen hundred pound force divided by eighteen that’s our area and that will give us pressure so that gives us a hundred psi which would be distributed if it were a full circle now because they took out these little notches I’m just going to call that one square inch so then we’ve got two square inches for each one of these so we’ve got twelve square inches 1800 pound force divided by the twelve square inches and that gives us 150 psi so simply by taking out these little sections we’ve increased the pressure on each one of these pucks by 50% now why would you want to do that well the reason you want to do that is some materials need a great your psi in order to not slip so for example this copper ceramic needs a greater pressure on it so that it doesn’t slip when you press on the throttle really hard you’ve got large torque going through it so that’s why you’re going to see these pucked designs so one of the things basically this yanaka performance clutch is rated to about 300 pound feet of torque and also it’s good for about 400 horsepower now when you do replace a typical clutch with one like this a performance clutch you will notice that the engagement is a little more harsh especially if you’re not matching the revs if you’re matching the revs it should be perfect but if you’re not then you’re going to kind of notice it a little bit more also you may notice some chatter at lower rpm so when you’re at lower rpms and you’re first starting in first gear the car may vibrate a little bit so you’re going to kind of want to do that a little more smoother and kind of have a little bit higher rpms for things like that and also there’s a 300 to about 500 mile break in so you’re not really going to want to go all out on that performance clutch like this until you’ve really broken it in well and then the materials kind of set and you get that maximum clamping force so thanks for watching feel free to check out the links to the unica product in the description below and feel free to leave any comments or questions you have thanks

About the Author: Michael Flood


  1. Its time that I change my clutch. I eventually want to get 400hp out of my car. will I have an problem if I buy a clutch that can easily handle the power I expect to put to it later? say a stage 3 clutch onto a stock car

  2. Hey I have the exact same issue with my clutch, It vibrates if pull out on first at a low rpm, but it is smooth at a higher rpm. Some people online said that first is probably just worn out. Should I replace my clutch or is the vibrating ok?

  3. I got a question for you I really like your explanation its great keep up the great work. so my question is what happens when you install a stage 3 clutch exactly like the one on your video on a Miata stock and the gear box does not let you shift into gear while engine running… please shoot me a message  that's my situation right now .I suspect the pressure plate is to stiff for the wimpy 1.6l either that or I installed it too tight


  5. My only question is how can someone dislike an educational and informative video that doesn't cost anything?

  6. If the only reason to use a pucked design is to increase the surface pressure, why not just use a stronger diaphragm spring? Doesn't the reduced surface area decrease the amount of friction by exactly the same amount that increased surface pressure increases it? I'm figuring based on the simple equation for static friction. Perhaps I'm missing something. Is the coefficient of static friction for the clutch material not constant with pressure?

  7. What's the difference between a 6 Puck Sprung and a 6 Puck unsprung disc?

    Don't know which one to get. And it says it requires a flywheel counterweight

  8. i dont understand something: u say less area of the disc, more pressure, thats ok but u also have less area with frictional force, so how does it benefits at all the transmission of torque?

  9. Quick q? I got 350miles on a stage 3 clutch im boosted like 340hp i tried to punch it the other day in 2nd gear and it slipped do u think i might of alrrady messed it up

  10. Can you do a video about how to properly break in a clutch, the do's and don't's? This is a highly debatable topic with not the greatest answers available. Also the break in period being different depending on the clutch material.

  11. I really like watching your videos. It's very cool that you get into all the corners and don't leave out any details of information. Watching your videos is like going to a mechanical engineer class with a awesome teacher that has the patience and humble attitude to explain and teach with real examples how and why thinks work the way they do. Thanks for taking your time man. Many of us appreciate your videos.

  12. Thank you. Great video. What about flywheels if the car is to be used on a short circuit arranged by cones? Slalom on a parking lot, with very short straights (less than 15 metres) and sharp corner (90/ 180 degrees). Lighter flywheel or heavy?

  13. 1800lbs of clamp and its a 6 puck? Oem ford focus st clutch can hold 400 l
    Ft lbs of torque with out issues. That's a organic clutch out doing this "performace"?

  14. So my clutch went out, guess its pretty normal with 2015 WRX's I am looking to either get a new clutch from the dealer or start building my car, however I need to know what would be good for my vehicle. By the end I will be looking for 500+ hrp however I am looking to do it slowly not getting all the parts at once. I'm not sure if you can do that with clutches, so was sort of looking for some help if anyone has some suggestions.

  15. keep in mind viewers are watching from other regions of the country/world where English is not spoken as "fast" a little bit slower pace would be okay. ☺

  16. I’ve just bought a 6 paddle ceramic clutch, says I should do a 500 mile break in, how do I break it in? Is there anything I should specifically do or don’t do?

  17. Heavy duty clutch doesn’t protect the gearbox from more power in anyway does it?

    Also, when you push the clutch pedal, the clutch is separating from the pressure plate or the flywheel? If yes, does the clutch permanently stay in contact with the flywheel?

  18. After replacing the clutch also still I feel the pickup is low. Changed the spark plugs too. I could not able to diagnose the culprit. Could you please guide me

  19. Ok so if i have a stage 2 ceramic clutch in my subaru does that mean i woulf be able to launch at higher rpms without damaging the infamously fragile 5 speed?

  20. Be warned if you daily drive in traffic you will find a performance clutch to be very ill suited. They are great for track use with a car that has mods that increase hp by a very high amount over stock. To say that they chatter, grab too quickly, and can make your clutch pedal heavy is a huge understatement. Please do more research before going with a performance clutch. The info in this video is correct from an academic perspective, but understates the draw back for the vast majority.

  21. So quick question, whats the best option for a guy like me who wants a stage 3 clutch with the softest possible engagement / stiffness / hardness? More pucks or less pucks? Sprung vs Unsprung, etc. @ Engineering Explained.

  22. Hold on. Isnt the puck concept controversial? By reducing the area you increase the preasure applied to the area by elimination of displacement space. Sound math, however, its done because the material needs more preasure to apply grip/traction/friction? Wouldnt a bigger surface area increase the amount of friction that the clutch applies to the flywheel reducing the amount of preasure needed to grip/get traction/friction ~ spin the flywheel?

  23. What Stage clutch can I get away with using on a 450hp 1997 LT1 Camaro? Looking at one with a Stage 3 clutch, and I want it to be streetable, and reliable.

  24. Wow! Good job! I'm doing a clutch replacement and was hacking at videos. I had not interest in this one but curiosity got me. I watched it and I'm so glad I did. I bought an upgraded clutch for my car and now know the difference between the two.

  25. Can I swap automatic transmission for a manual on a 2006 3.5 Altima and be able to fix ck engine light still using the OEM ecu

  26. maybe someone could help me with this. why use a performance slipper clutch for greater torque when u could just use a standard clutch which has much better torque by default and just learn how to drive?

  27. I own a 2015 wrx with 26,000 miles. Got it off the lot brand new take good care of it oil changes every 3k or so miles. I just recently did the stoptech front and rear brake kit, and replaced all fluids (front and rear trans fluids) with motul gear oil and gear 300. Also i had a clutch kit installed the clutch kit was the act II performance street friendly clutch kit. I had all this done by a mechanic. (I do believe either the engine or the transmission had to be taken out. Today i got my car back and now I can hear a ticking noise when im accelerating. It sticks around when i shift into other gear and driving too. The damn thing was functioning fine until i went to the mechanic any answers to this? Please help

  28. Forgive my ignorance but how would one break in a clutch on a racecar? A drag car for instance… You can drive it 500 miles before ripping on it at the quarter mile. What's the solution???

  29. Die you ever resurface, or 'turn' a flywheel when installing a new type of clutch, or does the break in take care of that?

  30. I have a question. When did diaphragm style pressure plates become so favorable?

    There used to be 3 main styles of pressure plates back in the 70’s.

    Borg and Beck (GM vehicles), Ford Long Style (Ford) and Diaphragm which was used by everyone.

    Diaphragm was the smoothest and most tame. Borg and Beck had 3 short and wide arms that contacted the throwout bearing. Long style had 3 long and narrow arms.

    Long Style was the better of the 3 styles. Nobody used diaphragm style on hot rods. Borg and Beck was the most popular.

    I had a big block Chevy back then and I custom ordered a Ford Long Style pressure plate from Weber clutches. It worked amazing.

    I was in high school at the time and chose that style after reading a comparison article in a hot rod magazine which explained because of the added leverage of the long Style, you could run a stronger clutch spring and push the pedal easier.

    So what changed? I’m guessing the popularity of automatic transmissions in V-8 automobiles?

  31. Do performance clutches reduce rev hang when shifting into higher gears? I’m looking to upgrade the OEM ‘13 BRZ’s clutch, and I’m thinking about putting in an Exedy Stage 4 clutch.

  32. in a dual clutch transmision which clutch is better to be used: a performance or a casual one?
    also does anyone knows a good website or book to design clutches?

  33. Bruh, carbon clutch you can beat the shii out of and drive away compared to a stock clutch will fault. Simple right lol 😂

  34. Jason, could you provide any information you have to the downsides of a single mass flywheel in terms of component damage to the drivetrain, gears, etc? and if I'm upgrading to something like a stage 2 or 3 clutch, is it completely senseless to stick with the stock OEM dual mass flywheel? trying to order soon as clutch is slipping hard on the n55 and needs replacing asap. Any help would be awesome.

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