Wow. Did not expect such a visible difference. But Vortex generators have nothing to do with down force, its about straightening air flow, reduced turbulence and air separation, in order to reduce drag and increase efficiency (fuel or aerodynamics). They are used on plane wings as well because the fins will straighten the flow of air over the wing, which increases lift underneath the wing.
I knew It helped stabilize air flow but always thought doing that made the air flatten out onto the back of the car and result in more downforce. I learn something new everyday! Thanks for the comment!
@@davidrush7951 .....because LIFT pushes a planer surface up.... and DOWNforce pushes a planer surface down.... Thats why there aren't vortex generators on spoilers. You put them on the top of a car to straighten the air flowing over it, reducing turbulence (creating friction through the air). If you have a spoiler on the back of the car, then the straighter air at the back of the car hitting the top of an angled spoiler, will increase the spoilers ability to provide down force, but the vortext generator itself does not create down force.
@@BradlehDadleh The reduced turbulence will generate downforce.... hope that concept isn't lost on you lmao when the air is smoothened over the back end of the car it brings up the air pressure over the top of the chassis generating downforce
@@BradlehDadleh straightening out the air flow, reducing the turbulence, air separation, drag will help create downforce (or lift, on an air foil) like you said, depending on how and where it is applied. and just to clarify... spoilers and wings (air foils) are two different things. STI's and Honda Type R's and such have wings. Nascar's have spoilers (that little flat lip at the end of the trunk) But thats all wings on cars are, upside down air foils. You dont see vortex generators on many wings out there but they do exist. And just like David said, the shape of the whole car sort of mimics an airfoil. Curved top, flat bottom. Keeping that air glued to the surface where it typically separates at the windshield increases the efficiency of the whole car, and the wing/spoiler at the rear. Thats why diffusers (vortex generators) are important under cars. I have a LARGE diffuser on my STI and it made a night and day difference in handling at hwy speeds. It reduced lift and created downforce. The car went from sort of squirrelly to feeling sucked to the pavement.
I thought about getting a sti spoiler for the car but im not sure I want to go that aggressive. I'll probably end up with a small less aggressive duckbill or a gourney flap
@@williammarlo6155 I think the cost on this is very reasonable, considering what other OEM parts cost. Also, I think this video demonstrated exactly that these aren't worthless, and over the life of your car, probably would save you significantly on fuel consumption. Albeit, you won't be noticing a huge difference on trips to the pump, but it's definitely doing something. If that's not worth 80 bucks to you... not sure what mods would be worthy. Maybe 300 for a under lip that actually does nothing?
My brother made his own and put them on his monte carlo and said he knowticed a 1mpg increase. He mounted them 3/4 of the roof length back from the windshield instead of the very back
@JulianEdgar This is an “eBay style” vortex generator, with fins longitudinally aligned to the body of the vehicle, rather than splayed out, exactly like you warned against in your video, “The truth about aerodynamic vortex generators on cars”. Do you have any commentary about the results shown in this video?
Honestly didn't realise this. This was a Christmas gift from my Fiance I double checked and the oem generator did change from 18-20 because of the different sized antenna. Even if it is the wrong one the antenna gap isn't very noticeable thankfully.
Usually more downforce will have a slight negative impact on fuel economy but I highly doubt its noticeable. I had this on my last wrx and didn't notice any difference in my average mpg.
That's not always true, as more downforce here can also help with better flow off the rear of the car. Downforce does not always immediately mean drag.
I didnt claim to be an engineer. Obviously. Taping strings to a windsheild isn't very scientific but hey, the evo came from the factory with them and it's a factory add on option for these cars, most rally cars also have them. So if they don't work then there's a lot of crazy people sticking them on their cars for nothing.
A lot of people put them on for aesthetics! But they obviously made a difference! I doubt it’s a big difference but it is a difference! I bet it would help a wing out a lot though! Great video man!! Keep it up!!
Wow. Did not expect such a visible difference. But Vortex generators have nothing to do with down force, its about straightening air flow, reduced turbulence and air separation, in order to reduce drag and increase efficiency (fuel or aerodynamics). They are used on plane wings as well because the fins will straighten the flow of air over the wing, which increases lift underneath the wing.
I knew It helped stabilize air flow but always thought doing that made the air flatten out onto the back of the car and result in more downforce. I learn something new everyday! Thanks for the comment!
How can you say that they are used on plane wings to increase lift (the opposite of downforce) and yet you say it doesn't generate any downforce?
@@davidrush7951 .....because LIFT pushes a planer surface up.... and DOWNforce pushes a planer surface down.... Thats why there aren't vortex generators on spoilers. You put them on the top of a car to straighten the air flowing over it, reducing turbulence (creating friction through the air). If you have a spoiler on the back of the car, then the straighter air at the back of the car hitting the top of an angled spoiler, will increase the spoilers ability to provide down force, but the vortext generator itself does not create down force.
@@BradlehDadleh The reduced turbulence will generate downforce.... hope that concept isn't lost on you lmao when the air is smoothened over the back end of the car it brings up the air pressure over the top of the chassis generating downforce
@@BradlehDadleh straightening out the air flow, reducing the turbulence, air separation, drag will help create downforce (or lift, on an air foil) like you said, depending on how and where it is applied. and just to clarify... spoilers and wings (air foils) are two different things. STI's and Honda Type R's and such have wings. Nascar's have spoilers (that little flat lip at the end of the trunk) But thats all wings on cars are, upside down air foils. You dont see vortex generators on many wings out there but they do exist. And just like David said, the shape of the whole car sort of mimics an airfoil. Curved top, flat bottom. Keeping that air glued to the surface where it typically separates at the windshield increases the efficiency of the whole car, and the wing/spoiler at the rear. Thats why diffusers (vortex generators) are important under cars. I have a LARGE diffuser on my STI and it made a night and day difference in handling at hwy speeds. It reduced lift and created downforce. The car went from sort of squirrelly to feeling sucked to the pavement.
Can definitely see a difference, this would be more effective with a wing like the Sti’s have. Great content!! Keep it up!
I thought about getting a sti spoiler for the car but im not sure I want to go that aggressive. I'll probably end up with a small less aggressive duckbill or a gourney flap
impressed with how much its straighten the air over the car
That’s really cool! I thought it was only for looks
Thank you a lot for making this video I was on the fence of whether to purchase one or not as my dad was saying it was worthless but clearly it is not
listen to your dad. theyre cosmetic thing. lol the difference is negligible. not worth over $10 in mods lol
@@williammarlo6155 I think the cost on this is very reasonable, considering what other OEM parts cost. Also, I think this video demonstrated exactly that these aren't worthless, and over the life of your car, probably would save you significantly on fuel consumption. Albeit, you won't be noticing a huge difference on trips to the pump, but it's definitely doing something. If that's not worth 80 bucks to you... not sure what mods would be worthy. Maybe 300 for a under lip that actually does nothing?
@@williammarlo6155I’m willing to bet money over 100mph these will make a difference
that's a great proof that it works ! good stuff man
My brother made his own and put them on his monte carlo and said he knowticed a 1mpg increase. He mounted them 3/4 of the roof length back from the windshield instead of the very back
Watched it as I installed mine. Same exact ones. Good vid man I was a little nervous but it was really simple
Only reason I'd get one is if it helped keep the rear windshield clean 😂
I wish that damn things always dirty 😂
I’m installing mine after I watch this video ✌️
ものすごく分かり安かったです。僕も日本でWRXS4に乗ってます。今日ジェネレーター購入しました。
I thought they were just for looks
I ordered some universal ones from Amazon for my '96 Corolla (has some mods on it already)
@JulianEdgar This is an “eBay style” vortex generator, with fins longitudinally aligned to the body of the vehicle, rather than splayed out, exactly like you warned against in your video, “The truth about aerodynamic vortex generators on cars”.
Do you have any commentary about the results shown in this video?
Gap for antenna is cuz there's two different antennas and two vortex generators from subaru. Bought the wrong one most likely
Honestly didn't realise this. This was a Christmas gift from my Fiance I double checked and the oem generator did change from 18-20 because of the different sized antenna. Even if it is the wrong one the antenna gap isn't very noticeable thankfully.
Actually I just checked the box and it is the correct part number for my 2020.
@@StreetInspired1 weird... mine from subaru fit a lot tighter than that.
Nice subtle touch!
Thanks man.
This was actually very helpful!
What a stupid test.. but surprisingly effective. Great job!
wow!
I wonder if it will have an effect on gas milage?
Usually more downforce will have a slight negative impact on fuel economy but I highly doubt its noticeable. I had this on my last wrx and didn't notice any difference in my average mpg.
That's not always true, as more downforce here can also help with better flow off the rear of the car. Downforce does not always immediately mean drag.
Who cares about gas milage....that thing adds 15HP!!!! 😁
Yeah right that's why Porsches and Ferraris have them because they work so well
I didnt claim to be an engineer. Obviously. Taping strings to a windsheild isn't very scientific but hey, the evo came from the factory with them and it's a factory add on option for these cars, most rally cars also have them. So if they don't work then there's a lot of crazy people sticking them on their cars for nothing.
A lot of people put them on for aesthetics! But they obviously made a difference! I doubt it’s a big difference but it is a difference! I bet it would help a wing out a lot though!
Great video man!! Keep it up!!
great vid❤
I’m so mad that mine is a little crooked
Can you use it on rear bumper
yes they are called diffusers my dood.
For anyone who wants a more scientific explanation. th-cam.com/video/uXYLCxq5YjA/w-d-xo.html
mm less not more downforce because you aren't pushing any air up. and maybe slightly more drag since you're forcing the air to do different things.
Great vid