I am trying to overcome the turbulence around my domestic car, to get a laminar flow of air from front to back. This last year I have been going down the 'Rabbit Hole' in every aspect to achieve this Learning on the effectiveness of a 'Under Tray', the effectiveness of 'Air-Curtains', 'Hood Ducting', 'Separation Edging', Adding a Lower 'Air-Dam' and blocking off the upper part of the grille to improve the aerodynamics and reduce the drag. Not having the Computer Capacity or Finances to research the CFD of my car I like to see if someone can do some tests to see he effectiveness of each of these as well as the effects of a Car-Bra, Bug-Shield, and other Add-Ons for the domestic car market.

What softwares were used for CFD? and what software was used to generate the model on the lazy susan? Nice video!!

What do you think about the factory Honda Civic EP3 TypeR rear wing? I think it's the nicest factory wing on a hatchback ever

Mate, I wish you had a BMW E82 1M to use for all your work :D

I heard from one of noriyara video this mod was used in 70s and 80s car in japan and i remember the name of it was front jacket or headlight jacket

"do you even lift"

Awesome content. Please do one on front fender vents.

did i understand it correctly (and im realy not sure), that you find out, that a round/smoothed out front is more fuel efficient and more aerodynamic, than this 40 year old chunky car? wow. thats not impressive. i would love to see how you try to improve a model of the hyundai ioniq 6. or at least learn from the already done innovations and add them to your model and see what is changing.

bro left us on a cliffhanger

BASED

Bro casually posting free aero advice on YT 😂

Are you simulating the tire's rotation with MRFs ? Great job!

Super cool. So the kamei grill spoiler probably does help some. Room is the issue in the Mk1 engine bay. I’m cutting out my core support to drop the radiator lower. Maybe I need to make a S-Duct with the upper grill and hood. 😊

whats the programm ??

lol this is all very heady for me, did you get formal education in this? man I'd love to learn it

Youre genuinely hilarious, im surprised no one mentions your dry humour in the comments

I'm amazed on how wrong is the Golf mk2 body as starting point... Lean forwards radiator to make proper channeled hood vent... And use a Skoda Fabia Combi mk1 6Y with oem rs/gt/gt line front bumper, orm under bumper/body mini spoiler and winter front grill cover... You'll get sCx on the 0.50s. play with the wrc hatchback rear spoiler and you'll get whatever sCz you need... Gw of around 1100kg and you can fit easily 1.8T or 2.0 engines like the ones in polos or ibizas gti/cupra...

I'm amazed on how wrong is the Golf mk2 body as starting point... Lean forwards radiator to make proper channeled hood vent... And use a Skoda Fabia Combi mk1 6Y with oem rs/gt/gt line front bumper, orm under bumper/body mini spoiler and winter front grill cover... You'll get sCx on the 0.50s. play with the wrc hatchback rear spoiler and you'll get whatever sCz you need... Gw of around 1100kg and you can fit easily 1.8T or 2.0 engines like the ones in polos or ibizas gti/cupra...

Take a drink every time he says Asthetic 😂

A boxy ef9 civic is a good model similar to the golf only better but the Eg6 civic is probably more slippery and allows for a bigger wing because of the down slope at the rear of the roof on an eg civic . The rules in Irish rallying say the Spoiler can't be visible,e from the front of the vehicle

Why dont you extend the front body work extentions all the way down to join to the bumper rather than the free floating design you have now?

Great video, i'd like to see what aero effect has making a duct that sits over the hood and takes air from the front grill and lets it out at the middle of the hood . This would be much easier to do than the first option imo, dk if it will be better than the second one. Pd: dk much about aerodynamics, just remember seeing that in this video ( kzfaq.info/get/bejne/e7CbnMeCu53FXXk.html )

Nice video. Just an idea for an experiment: instead of smoothing out the corners of the front bumper simply cut vertically from the fender down to the splitter, then you can smooth out from the splitter to the part of the wheel arch where you already have downforce. This Polo implements something like that kzfaq.info/get/bejne/p95-dKybl8qqfGg.html

Very interesting, well explained. Also always great when an S4 comes up on screen

Great video thanks for comparison! btw Helmut Maier made this changes back in the 90s. Great driver he is still competeing, however he is over 80!

*I tell all my car KZfaq creator friends about you.* Have any ever found you? And I don't know Rob Dahm personally, but you should definitely hook up with his team.

I use openFOAM and am curious where u get your models from Self drawn?

I wonder if you could achieve a similar thing by turning that bonnet relief into a vent. Have it pickup behind the grille in the same way and vent through the bonnet. That way it would still resemble the same car / front grille.

Is the next step to do a splitter/undertray designed for making downforce? It looks quite crude as it is now :)

I'm addicted to aerodynamic improvements.

Great vid, Nelson! One comment: 6:27 "Front to rear split has "finally" reached 50:50" I wouldn't dare race that car though hah! The moment the driver goes on the brakes with the car pitching forward, this would very likely move in favour of the front and creating quite a bit more of a front-bias, causing oversteer and potentially losing the rear, or, even worse, have the front stall and then losing all the front-end for a moment, resulting in a big chunk of front grip loss, only to regain it once the splitter comes out of stall. Let's assume stalling does not occur - the other problem may still render the car undrivable, or at least, make the driver lose a lot of confidence at medium and higher speeds. I would chase a balance of ~45-47% front downforce balance at a flat-rake simulation.

The more optimized this model becomes, the more I want to build a body kit

I hate both solutions, is the same problem an Argentinian category called TC has, you start to distort the shape of the original body so much in the end the car is not recognizable as a golf anymore.. there should be another way like evacuating all the air via the bonnet or similar

will these feature fix that problem? kzfaq.info/get/bejne/ZpepdM2qqL7bYWg.html

Love the work you’ve done, can really see just how easy it is to make an inefficient design reasonably efficient and make downforce. My car has similar issues (aerodynamic properties of a brick and front end lift at high speed) it’s good to see what potential solutions are

seeing you show how much small details influence aerodynamics makes me admire Formula 1 cars even more

Pushing air out along the sides of the car would increase drag though.

For mine, Steve Nichols more based his original MP4/3 design (which evolved into the MP4/4 in 1988, allowable to be lower because it carried 45 litres less fuel) on the shape of the Williams FW11 than he ever did the Brabham BT55. That's always been Gordon Murray trying to get his fingers in the pie IMO. But if you look at the MP4/3 and MP4/4 design just from the cockpit back ... they far more resemble the FW11.

9:07 uhm actually☝ it's only more efficient if drag (in the context of straight line driving) is your only consideration. there is also weight & space & material costs - with weight being way more important bc cars spend most of their energy on accelerating. aero isn't that much of a factor unless you are going very fast. but why consider other factors when you can complain about society? :P

what does the mini and the landrover reference? they look like cars to me

What about something like the 2020 Sonic RS Hatchback? It comes with just a flat lip as a spoiler for an inch or so, but below it, the car is done, completely vertical basically. I've seen people mount wings on them, but it didn't make sense, since the air is already flowing completely straight off the end. Is there any way to improve the aero with this or is the lip the best?

Sadly, I'm not quite smart enough to glean all of the incredible information embedded in your videos. It feels a bit like being proficient in a language while watching native local speakers converse. There's nuanced details that I know are buried and even overt ones you directly reference that I am sure I miss the true glorious insights you're sharing. Anyway, very grateful for the effort you put in to this hobby, it's outstanding!

Meanwhile, cars cancelling out all the improvements of Cd by making the frontal area bigger and bigger.

A Driving Brick Yeah at a 110 km .If you get hit by wind. Turn the steering wheel All you want . Pointless Best Too Just use the indicator to Let people know You're Going .That Way Now! & Maybe they'll Think. You ment to cross a couple of lanes. & Do a 180😂

Great video. But the Atlo Works without the slots can improve?

I would be really curious to see the aero analysis of modern Japanese Kei Cars, which are mostly super square, even more than the Nissan Cube (which is not a kei car btw)

Emotional Support Vehicles hahahahahaha

Got my wife’s 4.6 sport trac up to 25 mpg at 75mph after lowering it 3.5 inches and adding a bed cover. I try to implement everything I learn from your videos to get that number higher and higher

I feel obligated to complain in order to maintain social acceptance. You have hurt my feelings by not factoring in the weight distribution the long tall version would cause. I believe it's my social obligation to point out the abhorrent looking long tail would suffer increased frontal lift that would also disturb flow over the bonnet, windscreen and roof. I would like to complain in advance of the solutions requiring increased rear spring rate as ride quality and NVH are far more important than fuel consumption or the raising of the rear ride height on the grounds aesthetics. You won't need to worry about aerodynamics once Elon Musk builds hyperloop tubes everywhere. And look don't start with no one can breath in a vacuum, or out gassing is a real thing in a vacuum or convection and conduction aren't possible in a vacuum or anything not pressured will basically explode. He sent a car in to space without problems so I'm sure he knows what he's doing.