Rear Wings, Rear Diffusers and Rear Spoilers Explained - Motive What The Fast

[@22Wook]

My Lotus Elise has a flat floor and a diffuser. Nice to hear it described as a supercar/exotic!

[@TurboAfterlifeRacing]

Lotus Elise is an exotic

[@22Wook]

@@TurboAfterlifeRacing Perhaps. Although it's got the engine from a Celica in it, so I reckon exotic might be pushing it.

[@22Wook]

I'd also say the fact that it's from Norfolk counts it out, but I guess McLarens hail from Woking.

[@quest8795]

Don't put yourself down mate, the Elise is British engineering at its finest! Although I wouldn't call it a supercar, they can be just as fast on the right tracks, so still formidable 👍

[@22Wook]

@@quest8795 Don't get me wrong, I love the Elise and Exige, from the earliest S1 all the way to the latest S3. I just question whether anything exotic has ever come out of East Anglia...

[@DE3US]

Andrew is so fast so even his T-shirt has a small spoiler in the rear! ;-) Tks for another great and informative vid :-)

[@BobbyB910]

Hahaha he is studying plumbing

[@manitoublack]

And now for your next topic. The "F" Duct and why stalling the rear wing improved top end speed ;) Great video, and no doubt having the experience in the Air Force and being around fast jets help you in this as well.

[@Captaindan7141]

Thank you for taking the time to explain this!

[@Denni_g]

This series is honestly the best shit on YT right now. Super informative but simple enough for plebs (like me) to understand. Love it.

[@mattoattacko]

Thank you for always putting up such excellent content. I've been out of the auto-tuning world for the last 15ish years, and your content has really helped me get back up to speed. Much apprecated.

[@kaesh78]

Thank you! great content and food for thought. love the admission that it is all about getting the balance right and customising your aero to work for your application. these 2 videos have taught me a lot about what I need to do to try and crack some better lap times around my home circuits. Thanks Andrew and Andrew ! keep up the great work!

[@ZLAKLR20B]

S3 RX7, when mazda added their small rear spoiler, lift dropped 70% which is pretty good for a small addition. As for diffusers, many have proved a diffuser does work without a flat floor, but, will work much better with a flat floor. My own fd found a whole lot of under steer when I added the rear diffuser and and others noted the rear squat in the car it didnt have before going down the straights. 3 sessions were the same. Other drivers complained of lack of rear end grip during those sessions, my only issue was front end grip I hadnt encounted before. Last session I removed it, no more under steer. Next meeting, added diffuser AND front splitter, car was relatively neutral again, no float floor. Sure there could have been other factors, but it certainly seemed to us the diffuser created rear downforce and changed the balance of the car.

[@Ryan-hf9qz]

Keep this series up! Loving it

[@thomassieben4949]

The endplate prevents the air from the high pressure zone above reaching the low pressure zone below within the aeroactive zone for downforce of the wing. Not the other way as you said. But I guess that is what you meant.

[@davenorman6717]

Thank you ! For this enlightening, informative, thorough very well explained discourse that answered so many of my questions. Fantastic ! One question...@ 19:03 , you stated the low pressure under the wing wants to spill around the side into the high pressure (on top of the wing). Isn't it the other way around ? Wind tunnel tests show the flow going from the high pressure topside around the side of the wing to the low pressure downside, and thence creating vortices.

[@Kyrazlan]

I noticed this too.

[@turdferguson9190]

Really great video, looking forward to more video from AMB!

[@irchrisrawr0assault0]

Love these videos! Really informative and thought provoking! Now having a very basic understanding of these aero concepts, I'm wondering how they apply to wagons and hatch backs. I currently have a 98 impreza wagon

[@JuanGutierrez-tj4th]

I can only say you are fucking awesome and that you know your thing better than anybody

[@ELJ666]

This is making me want to put a wing on my 2007 Ford Focus ZX3

[@css172]

Love the info and really well presented! Thanks Andrew.

[@bassmunk]

This is why I replaced my lower rear bumper valance of my mk4 Jetta GLI body kit with the stock one, cuz the stock one is higher and lines up perfectly with the bottom of the trunk floor, which is also angled up from the rest of the car like a little diffuser. Next stop, fat lip spoiler and rear aero is done. This coupled with the low front GLI bumper with the side vents blocked off makes the car very slippery and stable at highway speeds, enough to feel the difference. Eliminating lift makes a huge difference! 👌

[@zappy7393]

Lowered my bonnet as mentioned in the last comment section. No longer have to have my fans on when highway cruising. Used to always have to have at least 1 fan on. (180SX with AU Thermos), mind you, doesn't look as cool :P May I suggest we talk materials and brands next episode?

[@waynebroome7984]

Awesome content very easy to understand, cheers,

[@tangles01]

The other major factor with rear wings, efficient or stalled, is the centre of pressure, think of an arrow or a dart, moving the centre of pressure rearward will make it more stable, the faster you go, the more stable you are. This is the same principle the shark wing on the Porsche uses at WTAC and the fins that were on F1 cars a couple of years ago.

[@glivings168]

Thank you. I've always was curious about the wing extension, and the N1 spoiler for the R-32 GTR and to see if they actually worked or not.

[@BeauKnowsMultifamily]

super helpful info. question: I have a Miata NC1 with a 5 inch tall Carbon Miata ducktail spoiler. I plan to add a Nine Lives Racing swan neck wing on the back and a 4" Racebred splitter with air dams to the front. Is the 5 inch ducktail spoiler too big?

[@andreysuslov138]

Really appreciate the information you shared. Please let me translate this, voice and publish it

[@adamloader9534]

THX for doing some myth busting as well as educating us👍

[@martynpotter21]

Great content again, Andrew. Thanks for the educational material 👍

[@Crazy4wheels]

Great explanation, very valuable content 👏👏

[@elitecol69]

That bolt hanging out the coolant bracket @0:06

[@Thomamps]

I have a Vl group A and every part of these two videos I can see how they have maximised the aero effect for that part of the car staying within ADR. They are said to have a CD of 0.28 and make 150 kg @ 160 kmh which does seem possible given all this information.

[@beerdencustoms7651]

Loving the info 👌

[@victorrodriguez-ix9ys]

Amazing video!! Very clear instructions !

[@davidciesielski8251]

WOW!!!! Thank you so much.

[@Nismology33]

Nicely explained and drawn 🤓🤣. I learned a lot and greatly appreciated bro

[@michaelandre587]

Hey! What ever happened to that sweet green R34 with the VQ38 R35 power plant ???

[@petkokrushev3840]

Hey Andrew, what is your opinion on the roof spoiler of the 06-07 Hawkeye STI? It is meant to guide air to the rear spoiler for more down force, but at the same time it creates lift and huge drag in my opinion

[@thinwig9953]

So boot lid + spoiler is the best combination? Or just for certain scenarios. I have a jza80 Supra and want to put a APR Wing on it but if I can get more pressure away from the car I should go small lip too?

[@SilentKilla92]

My current build is based on JET200, although its aimed at Super Street/Autokhana.

[@ur1off]

Your a bloody legend!

[@rogergm92]

Thank you so much

[@Kyrazlan]

Mass deflection can be quite a bit of the force but at automotive speeds I doubt its very effective at creating downforce when it's in stall.

[@ACamaroGuy]

So the shark fin looking rear diffusers are no good unless the underside is flat?

[@JustAnotherHouseCat]

So much to know, well I guess now I need a flat floor kit for my S14. I just want to know if the Autech S14 spoiler even works.

[@Klutchylol]

Regarding diffusers, what about ones like the vspec R34's? They don't have a flat floor, but the diffuser extends past the diff a little bit. Surely Nissan wouldn't have added it to the v-spec's unless they were functional.

[@MotiveVideo]

Nissan has engineers using CFD design and wind tunnel testing. Like we said. It needs to be designed to suit a car. It's not very serious amount of downforce. Enough to make the more stable

[@gt4lex]

@@MotiveVideo Some R34s actually have kind of a flat floor, with 2 pannels on each side, just leaving an opening for the exhaust heat not to be trapped. I assume the V-Spec has it. Now it would be nice if you could talk more about flat floors, especially how you manage and balance the potential heat retention and diff cooling issues on FR cars.

[@Kyrazlan]

Low pressure does not spill to high pressure as things travel from high pressure to low pressure not the other way around.

[@jesseDM240]

Is the N1 lip spoiler different from the lip spoilers I’ve seen on most r32 GTRs? Or is there only one type of genuine Nissan lip spoiler? I found the part number 96032-RJR21 and this K6032-06U00 on the Heritage website. Are they the same part or is one an N1 and ones normal Nissan?

[@charmonsterteampeters-hugg7483]

Love it light it very good

[@redhaze8080]

Was this the vid you talked about my mum's x3 Excel getting light and jumpy at top speed?! I found that little Hyundai very stable at a police LIDAR clocked 207kmh =) I got it overturned in court because the car was stock an the judge agreed that 207kmh is not possible. Sadly i owned it.. but it being my mum's car is a way better story! :)

[@redhaze8080]

x3, settled as dude, god the stink some cars pull on ya at 190kmh, why pick the very stable at speed x3 out . 2002 odd 2 litre lancer was jumping all over the shop at those speeds... and it could get there with out playing silly buggers!

[@Limeayy]

Appreciate it. I love these videos.

[@TCDF22]

Excellent video. Should be required viewing for any teenager before they buy any body mods.

[@dreed5965]

Are you keeping the stock r33 gtr spoiler for your No Secrets track car? Does that spoiler work well?

[@hossamahmed8725]

Thanks for the info

[@4evervacation]

does my top secret diffuser on my r32 gtr work? or not really? really wonder if they did cfd/wind tunnel tested on their products

[@ceddyb11]

Love your content, what's your opinion on voltex? it seems like they make legit products that are useful.

[@MotiveVideo]

Can't argue with the lap times

[@wobblysauce]

Lap time is about the avg speed... depending on the track it is a balance of straight and corners.

[@johncuthbert5320]

Brilliant video. Pardon the pun.

[@Imprezalove]

What about roof spoilers? In conjunction with trunk spoilers?

[@MotiveVideo]

aftermarket bodykit roof spoilers are the enemy of aero:

[@JimmyLLL]

Active aero for Jet200 next.

[@Sai_Krishna_Reddy]

can any one explain with spoiler on rear end air moving upperside 5:47 so doesnt it results in increase in wake region thus increase in drag

[@gokhanozarslan8999]

I wait that Thanks You re the best

[@sideswipebl]

Take a shot every time he says "low pressure zone" you'll be dead in 5 minutes

[@MotiveVideo]

Literally the central focus of downforce and aero

[@sideswipebl]

@@MotiveVideo Yeah I get it I just thought it was funny because you said it a lot

[@clarissafarmer3547]

I got a v8 supercar rear wing on my 6 cylinder vt commodore, will it help with my main street times? Great vid hawko

[@matthewyang2792]

Decreasing air under the car creates a negative pressure under the car making air wanting to enter under the car essentially creating a vacuum making the car sucked to the ground if you continue to prevent air from entering underneath the car.

[@LilBoiiKantu]

Gary v is that you?

[@spooler7828]

Yo, Need amb-aero to design some parts for a 2009 to 2014 370z Nismo.....

[@MotiveVideo]

He doesn't make any parts. He designs them then you get them made.

[@spooler7828]

@@MotiveVideo that is even better.

[@evlsc400]

So I shouldn't buy a rear windshield spoiler for my car? What about rain guards? lol.

[@MotiveVideo]

Roof spoilers are purely cosmetic on sedans/coupes and make things worse

[@evlsc400]

@@MotiveVideo Thank you for this insight :) more money towards side skirts now.

[@manitoublack]

gurney flap, anyone ;)

[@lerrynhawke3375]

Ohhh 2 people at the moment dont want to go fast..