The Porsche Cayman GT4 Has Dimples Like A Golf Ball!
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- เผยแพร่เมื่อ 18 พ.ค. 2021
- 2021 Porsche 718 Cayman GT4 vs 718 Cayman GTS 4.0 - Aerodynamic Comparison!
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The Porsche Cayman GT4 and GTS 4.0 both feature a naturally aspirated flat-six cylinder engine. They both have PDK and manual transmissions offered. And in this case, they're both the same shade of blue. But there are actually dramatic differences in terms of how these cars perform, much of which might be overlooked by the naked eye. The aerodynamics of the GT4 are all about downforce, while the GTS 4.0 is all about minimizing lift. The GT4 has an upgraded chassis, suspension, wheels, tires, engine tune, and many aerodynamic changes to maximized downforce and minimize drag. Part of the solution? A dimpled underside, similar to that used on a golf ball!
On a golf ball, these little dimples cause turbulence, meaning little pockets of swirling air, so instead of a laminar boundary layer, you have a turbulent boundary layer. In this case, the turbulent boundary layer stays attached to the golf ball longer, wrapping around the ball, meaning the wake behind the golf ball is smaller when the airflow detaches from the golf ball, and a lower pressure region forms. With a smaller wake, the ball has less drag, and thus can travel farther. Porsche says the same logic applies to the GT4, in their words: “At the front end, the special surface on its underside is dimpled, reminiscent of that of a golf ball. As a result, the airflow follows the contour more precisely, reducing drag.”
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"it's not hail damage. it's an aerodynamic feature."
haha yeah
All hail aero
That’s a great user name.
SOLD!!!
Time to head for an auction!
"Should I buy the GTS or GT4?"
"The question is simple: Why are you thinking what car is better for you if you dont even have money to buy a Dacia Sandero?"
It's like the age old question of "Ginger or Mary Ann", to which I always reply "Both!!!".
You had mention the Sandero :))))
Great news!
Oh yeah, the cheap but not crap british car James May rode in, right?
The only person I know that gets two cars from the same manufacturer at once
@Sabūr Ali Khan wow, amazing 🤩 😯
It's like comparing the hardback and paperback versions of the same book.
It often happens to Jayemm on cars with Porsche and audi
Stradman has 2 Aventadors...
@@underseer “gets”, not “owns”
Thank you for the bananas. I wouldn’t have known how big the frunk is.
I don't always measure my trunk space
But when I do
I use bananas
I love the way americans measure things everything but the metric system
banana for scale
@@thecorsentino Someone gets it :)
@@JM-pg8qv I don't get it
I know it’s a good day when I hear “Hello everyone and welcome.”
And it is also a good day if you feel free to leave your questions or comments down below.
Hello everyone *_aaaannd_* welcome
What about the whiteboard??
ehehhe indeed
Every time I read about this in engineering textbooks, I always wondered why it wasn't implemented on more race cars. Glad to see this dimple phenomenon being used in new applications.
My high school science fair project was on the application of golf ball dimples to vehicles based upon Bernoulli equations and wind tunnel experiments back in 2006 and I got 2nd in the state of GA. Showed that applications in certain areas provided fuel economy benefits.
That's super interesting, do you have anywhere that I could read about it? If not would you mind explaining it in further detail, like which parts of the car benefit from a dimpled surface?
I'd like to know too, if you have aby material that you went through or created yourself. Thanks in advance
MythBusters was a great show to watch back in the day!
Yes they did and proved the concept
but yet so many people still wont believe something even after evidence is provided...prime example being all the people who still say that a plane can't take off from a conveyor belt. But flat-earthers also still exist.
Nothing like using Jetta tech to make your P car faster. HAHA
I came here to say basically same thing. 😁
"Makes PP goes faster"
No wonder Porsche tried to buy Volkswagen pre-GFC.
For the dimple IP.
Technically both vag lol
Yup, my 11 year old Golf has these.
After living in the DFW... all my cars now have dimples like golf balls due to the hail.
Great idea, live where your car naturally gets more aerodynamic!
I live in DFW and my windshield has dimples too!
Sounds like you two should consider getting Cybertrucks.
@@rubidot I would be fine with that but my budget is about 10% of the cheapest cybertruck.
@@johnhunter7244 in that case, I suppose you'll have to stick with nature-assisted performance modifications.
this is one of the best and most detail review on GT4 i have ever seen, good work man
I had a panic attack when that golf ball fell off the bench towards the cars.
Same here!
Me too!
Excellent material, thanks for uploading.
Driving in our beautiful backyard! Bonneville dam and along the old Columbia Hwy. You put together some great segments here. Thank you.
Would love to see a EE + NileRed collab on the fluids that go in a car.
NileRed - "See this Lambo here? We are going to reduce it to it's chemical components."
Jason - "Hello and welc... Wait what?
“Today we are making engine oil from this pile of Geo Metro fenders I picked up at the junkyard”
This is so satisfying to watch! Thanks you EE
Jason, can you do a video on why engines over the years have had an even number of cylinders. Why Audi failed at their five cylinder (90’s?) but now we’re seeing three cylinders - what has changed and are they a good idea
Should be a fairly simple answer I think. If it's an inline engine then an even amount of cylinders is not too important, but when it's a V or flat engine then symmetry is very important for eliminating vibrations. Even with an inline engine I think up and down vibrations could exist but combustion timings could minimize this while unnecessarily complicating the development.
Audi didn't fail at the 5 cylinder.
It's still being used now. TTRS, RS3.
The ford focus st used a 5 cylinder.
Even the ford ranger wildtrak used a 3.2 litre 5 cylinder turbo diesel.
They work fine.
WOW! This may be the best car video I have ever seen. Great job!
Excellent video, lots of information.
Nice vid as always! You beat me to an aerodynamics episode on the GT4 though, was planning on it! You do a better job explaining though.
This is the comparison I’ve needed since I learned about the GTS! My realistic dream car just became more attainable! Thank you!
It's awesome, thanks for watching!
This new cayman looks so good!!!
Yes I have seen the mtthbusters episode and have been waiting for a car with that tech ever since ! About bloody time someone took notice.
Same here! Finally done, I hope many other vehicles of all kind will follow.
VW been doing it for years as he have said though.
One of the best car videos ever. The dynamics are all about the basics.
The 2005 Ford GT had the dimples on a large area on the under body. It is very cool to see this technology used on vehicles.
Enjoyed the video.
Great video as usual.
Thank you.
Hi, very good Video and explaninations, thanks a lot for this video:))
Came expecting a reference to the Mythbusters episode, was not disappointed. I've seen a lot of people mention they prefer to see you in front of a whiteboard, but I like seeing these change of scenery vids as well. Great video!
agreed, both are great!
Love videos about the cayman GT4 and GTS 4.0. My dream cars
as always!! Great video J!!
Congratulations for 3 Million!
Thank you!! 🙏
Well deserved
I think he has more money from youtube than that.
This was an awesome video !!
Exceptional. Superb content.
This is reminding me that I've always wanted to experiment with covering the bottom of my Miata near completely with panels to see if there can be any mpg gains.
OK that was one of your best videos ever. Never stop doing what you’re doing!
Thank you!!
Love the show, feeling like going to learn something when I hear"hello and welcome".Will we talk about how the wheel faring on a F1 car 2009 in the future?I‘m looking forward to understand it. Also interested in the gill radiator of earlier formula 1 cars.
I noticed this on my dad's GT4 a couple weeks ago, and remembered EE's video on the inflatable reverse dimples lol
I'd love to see more of these kinda videos!!!!!
It's Been awhile.. Good to be back
Hi, cool video! Would you do a video on dry steering?
Thank you 🙏 AGAIN for your excellent succinct informative and funny work 🙏💪👏👏👏👏👏👏👏👏
Those engineers are geniuses. Thx for sharing.
Thanks for the video. Interested to know which QuickJack model was being used in the video if you happen to know?
Good video as always
Love your videos, especially the Porsche ones :)
Congrats on 3 million subscribers! 😃
BEAUTIFUL automotive examples of art! GIMME-GIMME-PLEASE!!!
the gorge is a beautiful filming location. nice review.
Jason! Where did you shoot the scenery clips with the mountains and water dam ?! It looks Beautiful.
Nice explanation! You forgot to mention that the inventor of the Golf ball dimples was William Taylor. William Taylor, a britain, was one of the founders of Taylor & Taylor, later with the admission of Hobson it became Taylor Hobson. Taylor Hobson produced the world famous cooke lenses for cinematography and interestingly later they have invented the first surface texture and also the first roundness measurement equipment which became standard in engineering, construction and also in engine engineering. Today this company is still producing the most accurate measuring equipment with their headquartes in Leicester/UK. They were aquired by the american Ametek group years ago.
I have mentioned this because most of the times you are lecturing about engines and my intention was to build a brigde -> From Golf balls to Engines...
Looks way better than the Mythbuster's iteration of a golf ball dimpled car.
As always, very interesting video. I am going to investigate now how exactly a rear diffuser generates downforce, which is something I've never known despite being a mech engineer lol.
After I saw the MythBusters episode, I thought of the same thing, only regarding airplanes.
Same, excluding airplanes :P
Airplanes tend to use stall strips and vortex generators instead of dimples, but the goal of energizing the boundary layer by creating turbulent flow is the same.
Airplanes just make use of the deadspace at the back instead of trying to minimize it. That's why they are so long and slender (teardrop shaped). There are limits and practicality reasons why you don't want to make a car long and slender, and obviously for a golf ball you can't orient it since it's a sphere, so in those cases minimizing the vacuum at the back is helpful.
airplanes use this principle a lot actually, look at a wing and the entire body, you see those exposed rivets? they cause the same slight turbulence and are left there for that reason, a better airfoil than a perfectly smooth surface. I'm no aerospace engineer but I did study aerospace engineering and take a few classes on it before I decided I liked what I was doing more than engineering
Cost effective production for the dimpled surface on an airplane is just not possible. Also maintenance cost would skyrocket, as seen with the attempt on using shark skin like texture on airplanes.
Everything you said at the end of the video about which car to buy is so true. “I guess buy the GT 4” LMAO. Exactly what I was thinking. Great content, thank you.
I think of it like the age old question "Ginger or Mary Ann?".
I've always said "Both!!!".
Congratulations on reaching 3 million subscribers!
Great video, Jason! I love the results of the work you out into your channel.👌 Congratulations on surpassing the 3 million subscribers milestone! Well done, sir.👏
Unrelated fun fact: Women with dimples are a little bit faster, too.😜
Way to parse the details! .. even though I'll never be able to afford either... it's interesting none the less..
The exhaust thru the wheel well is a good idea I might have to use that on my mk1 rabbit racecar. Due to the fact that I have swapped in a haldex AWD system and a 1.8t that will make over 300hp I have very limited space in the back for the exhaust and it is 4 inches wider per side than stock so I might have enough room there it's at least something to look into.
The Voice. The explanations. The Visuals!
Bonkers!
Nekkid girls can button up and go home while i keep watching Engineering Explained.
Thumbs up and subbed! And the bell as well.
Bowers & Wilkins uses that on their speaker ports
Amazing video !
Porsche is awesome! Every project has its amazing details and well-thought engineering
Really awesome video
Excellent! Thank you
Ahh yes, the banana for scale method
Great video, thanks for the info. I noticed all the downforce data is at top speed. About how much downforce is available on my GT4 at the track, where speed doesn't exceed about 130 MPH? I'm assuming downforce goes up with the cube of speed, so I'm thinking it decreases pretty rapidly coming down from top speed.
I feel like the Corvette should do this just for the golf aesthetic. 😂
Thank you Mobil 1 for sponsoring a Porschen of this video.
When the ball rolled off the table I was so concerned about it bouncing into one of the cars 😂
If it can’t take the impact of a slow-moving golfball it’s time to go home
If it had hit a car, it would have just improved its aerodynamics.
@@jamesbeaman6337 hah! That made me laugh.
@@arzemagic only car id feel comfortable with a golf ball hitting is that Tesla cyber truck 😭
America's Cup yachts used a similar concept 'shark skin' applique on the hull back in the 80s.
12:22 Banana for scale! That catched me off guard :D
It's crazy how easy it would be to press some alumimum plates to cover your entire underbelly with.
Slow process if you do it by hand, but it would bolt right into existing bellypan holes.
The underbody of early 2000' Opel Astra also had a dimple pattern.
can you do a similar aerodynamic explain on the 2016 981 GT4?
congrats for 3 million subs
Please demonstrate
How is lower and upper wishbone attached to uprights and chassis in F1 2020 car?
In the gt4, what’s the temps like coming off the backside of the radiator?
Does Porsche run those diverter fins on the gt3rs with vented fenders
My flight instructor heart can actually get on board when Jason talks about aerodynamics except on cars you want the opposite of what we want on planes haha
And what is that?
@@yayayayya4731 Cars try and reduce lift and create downforce which is the same principle as lift just downward instead of upward like on a plane. Which is why calling a spoiler a wing is kinda ironic ;)
@@TechLovinDude as James May pointed out, the diffetence between a spoiler and a wing on s car is, whether or not you can put your head through underneath it.
The airfoil shape is the same for a wing on a car any an airplane, just rewersed. Though there have been airplanes with reverse airfoil wings. I think, it was for air shows though.
@@CerberusTenshi That's valid. I just think it's funny.
Most aerobatic plane's wings are symmetrical in shape so the air actually travels the same distance whether it is traveling on the upper or lower boundary lower which doesn't invoke bernoullis principle and instead utilizes angle of attack manipulation with pitch to increase or decrease lift. Makes the aircraft more maneuverable for aerobatic purposes. Asymmetrical wings are better for stability and worse for maneuverability. In plane applications of course, not saying this part has anything to do with cars just responding to your point haha.
In some supersonic fighters, the wing surface has laser drilled pinholes to allow air to be sucked into the wing by a vacuum system. This reduces drag. Maintains super laminar flow and allows for super sonic cruise without afterburners. I’m waiting for this system to surface in a hyper car.🤔
would be interesting to know how much of that underbody cover would still work if swapped ...maybe just the diffuser
10:11 Anyone know what mountain this is? Gorgeous landscape.
Really excellent video! I’m not track oriented so the GTS is my choice. Did you notice which was more comfortable on ordinary diving roads etc? Are there any drawbacks to GTS compared to base Cayman for regular driving. I’d think the best choice would be a base cayman for street use? Smaller wheels -18” rather than 20” and softer suspension.... I think would make is softer more compliant and less harsh than the sportier GTS? Right?
Where was this filmed? It looks so beautiful I need to go here I'm tired of desert.
Hey Jason can you explain if it’s possible for a car to use less gas at the same rpm depending on the scenario and if so what’s the engineering behind it 🤔
The 2021 GT4 with PDK is my dream car. Gotta work hard to make that happen.
There's also a company that modifies the Cayman 4.0 engine to be 4.5L and makes nearly 100hp more than stock. It's wild.
Hey Jason I like that car lift
Ah yes, finally a car that I can transport bananas in. :3 A good high-potassium snack that I can eat after doing hot laps.
Also love the Mythbusters and Donut shoutouts. I love this community. 😊
Is that a GT4 with clubsport package? That roll bar or harness bar is not available stock in the US
I had a 1986 Oldsmobile 3.8 litre with hail damage suffered in Deadwood, SD. My ANNUAL mpg was 30+ for all driving.
That integrated lunch box at the front of car is very innovative! 🤣
So...does this affect the optimal speed balancing drag, lift and momentum? For gas vehicles this was about 55mph/90kmh.
I wonder if these features make enough difference to change that optimal speed. And is it any different for EVs?
Gt4 vs Honda type R ? Specifically on track use and difference in cost consideration. Thank you
the dimples remind me of the thermodynamic principles that regulate the beautiful vineyards of lanzarote, in the canary islands, that seen from a plane (or drone) look just like the cayman's floor.
A little off topic, I am aware.
Lexus utilized a similar system ~20years ago. Puma also used it on ⚽️s
how do you service the engine? or is a case of engine out job?
EE + Porsche = like even before the video has started.
Dude we need you on our team to make our Pikes Peak Bug diesel record even better!
I remember reading some people in the hyper-mile community have put dimpled plastic on the outside of their honda for better aero. This was some time ago.
In the early 90'ies I read an article about how the dimpled texture of shark skin produces less drag and that surfboard manufactures were trying to incorporate this to their boards. Never heard more of this but I have always wanted me a board with "shark skin" surface, because I felt it was a good idea.
718 GT4 is probably my favorite new porsche, btw what was that road you were driving on
it looks like the historic columbia river highway