Show me great diffusers!!

"Saf1" (safone) 05/17/2015 at 15:30 • Filed to: Diablo, Diablo GT, Diablo GT2, SVR, Diffuser, Downforce, Wood, Lambo, Lamborghini

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Incredible rear section of the Diablo GT2 - wooden diffuser set very, very well in a fantastic rear assembly!

Can’t remember where I read about the wood itself (balsa? pine?) but it’s basically an example of efficient engineering as well as being an innovative idea

A lot of great things started with the SV, like the spoiler that made its way onto later models which I posted in the recent Jalopnik article about spoilers, which actually prompted me to make this one :D

Though this diffuser evolved, from alllll the way back...

What excites me about its diffuser is the “hollowness” of it, the massive radiators for the engine lead out into the cupped diffuser which is also moving a lot of air from the underneath of rest of the car up and away...

But the road car perfection lies in the GT, where a new, lighter version is used by omitting the rear bumper (the GT was a Euro-only model) and the lights there were integrated into the taillights (I love asymmetry in cars, this is a mild example of such)

The new diffuser makes those fans so visible, plus it shows how steeply raked up the rear end of the body is, I love how it so visibly screams that the whole rear is designed to get air up and away, giving downforce (the SV makes a bit of positive downforce at speed, the GT with new front dam and this assembly probably makes more)

The SVR had a great setup as well, but GT2 happened, so that’s my race car entry!

You know I’m biased, so open my eyes! :D I really wanna to see examples from both road and race cars guys :)

Twingo Tamer - About to descend into project car hell. > Saf1 05/17/2015 at 15:31

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TheHondaBro > Saf1 05/17/2015 at 15:35

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Uug > Saf1 05/17/2015 at 15:45

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It’s a bit obvious where my allegiances lie ;)

cornerslide > Saf1 05/17/2015 at 15:47

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Hope they used OSB plywood. Otherwise I’m calling the building inspector.

Saf1 > Uug 05/17/2015 at 15:48

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Wow, I wonder if some of those mods have made those cars track-only-or-wince-driving :D

this is not matt farah's foxbodymiata > Saf1 05/17/2015 at 15:49

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Keonigsegg Regera, the exhaust is a part of the diffuser, because why not.

Blondude > Saf1 05/17/2015 at 15:53

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Milky > Saf1 05/17/2015 at 15:57

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Now this is a diffuser.

Uug > Saf1 05/17/2015 at 16:07

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First 3 are track/street cars, the remaining are track only. Wincing comes with the territory at that point, haha.

As a dedicated road car example, I know that various guises of the R34 GT-R came equipped with rear diffusers and NISMO offered them as add-on options like so:

I like a lot of homemade aero/grassroots racing stuff as well.

whoarder is tellurium > Saf1 05/17/2015 at 16:18

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RX-8 barely counts but... I did it anyways.

71MGBGT Likes Subarus of Unusual Colors > Saf1 05/17/2015 at 16:34

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Saf1 > this is not matt farah's foxbodymiata 05/17/2015 at 18:31

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Excellent! Efficiency like this is what I love

Saf1 > cornerslide 05/17/2015 at 18:34

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I’m 80% sure I get the joke but 100% sure I’ll kill it upon discussion so...yea 8D

Saf1 > Blondude 05/17/2015 at 18:52

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Cool pics! Always was a big fan of the 599xx’s aero package, even back then it didn’t feel silly, the right amount of extreme lol. I love how the Aston Martin (forgot name)‘s diffuser just out like that, livery complements. Liberty Walk Murcie, not exactly my thing but I do appreciate it. Gallardo GT3 or whatever race car, good overall look with the shape of the spoiler as well (saw this on the jalopnik spoiler’s post - you?). On a side note - F40 LM or C were very cool but they lost what made the F40 so special to me, the cohesive package, the simplicity and fine balance in the design. Even if it wasn’t a “delicate” design they were trying to Xzibit the wing about a decade before we were never ready! But ofc, those were necessary mods of significant performance... ANyway the diffuser, this is what I was saying:

The main body is “one piece”, it quite clearly is 2 main pieces but the car appears formed for speed as a whole. I’m really not articulate enough to properly speak my mind but maybe it’s understood :D

Just look at that. Big but subtle yet clearly functional. This is the design theme of the car. Everything is big nothing is shy but nothing is “embellished” with this or that

Saf1 > Milky 05/17/2015 at 19:01

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I’m actually more impressed by the street Viper’s underbody, on an ACR it’s expected but there is a decent area dedicated to splitter and diffuser in the roadcar...is that 3 layers altogether in the rear?? I mean there are 2 sections but.... would say the bottom of the assembly count as its own layer? The air there would be moving at a different speed as well so..

Saf1 > Uug 05/17/2015 at 19:09

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One thing I never got about diffusers/venturi tunnels, they apparently increase downforce and reduce drag, win-win right?! So why do we not see this implemented in more cars? What are the drawbacks? Packaging issues of car to allow that space beneath? Add-ons for the most part would not require prior modification to be called that so how much is that a factor? I was gonna ask about the skirts if they were aesthetic or functional then thought this is a Skyline must be the latter then realised that maybe not since add-ons are sold!! I first wondered this when the F1 Longtail came out, that makes more downforce for less drag, when making the worlds fastest car and after surely extensive wind tunnel testing, why would they not have discovered this or implemented this for the original F1??

Saf1 > whoarder is tellurium 05/17/2015 at 19:12

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Counts very much! It’s nicely done and good to see on a car of that price range. And I do love the diffusers that jut out like the GT’s there

Saf1 > 71MGBGT Likes Subarus of Unusual Colors 05/17/2015 at 19:14

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Just insane, how else to describe the Veneno? :D

Milky > Saf1 05/17/2015 at 19:45

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Im 99% sure thats the ACR too, by the hood/fender vents. IIRC the front lip and the extreme part of the diffuser are removable so you can actually drive it on the street. Either way though, impressive.

Saf1 > Milky 05/17/2015 at 19:56

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That answers something that was milling in my mind earlier, when I passed by the article on the new ACR, being street legal! I wasn’t wondering about ground clearance specifically but was wondering why other manufacturers don’t make their track cars convertible for road use. We already get exhaust valves! Other manufacturers should do like SRT I think, ofc w/o compromising the performance of the track version

66671 - 200 [METRIC] my dash > Saf1 05/17/2015 at 22:17

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Oh lord is a thread like this long overdue,

^ !!!!!!! (This car holds some sort of record at Tsukuba TT, the Under Suzuki Silvia)

cornerslide > Saf1 05/17/2015 at 22:48

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OSB is exterior plywood for building houses. Something I’ve dealt with for 35 years. I just thought this was an interesting use of of a sheet of plywood. If nothing else it’s easy to change if it breaks.

Saf1 > Milky 05/18/2015 at 04:04

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Also, I’m looking through images of the ST Viper, it seems from reproductions of the underbody that there isn;t, a YT screenshot shows what looks like a skidplate but no “gap” for air, yet from the rear bumpers of the 2006 Viper and the SRT there is definitely considerations in the rear bumper... no way those aren’t functional, we must just not b able to c it!

Saf1 > cornerslide 05/18/2015 at 04:07

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Pretty sure that was one of the reasonings, that it will constantly have pebbles etc chucked at it, but I looked up OSB like I said and it seems not suited to applications where weight is an issue? Especially since it’s got glue in its construction...though I have not looked up the densities of natural or manufactured woods...

cornerslide > Saf1 05/18/2015 at 05:39

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When used as sheething it isn’t weight baring.

Saf1 > 66671 - 200 [METRIC] my dash 05/18/2015 at 07:55

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Holy hell!! Gloriously OTT :D Love it!!!! Looking esp at the Silvia, makes you wonder why you don’t see such mods that much, ofc it would autoexclude them from many racing leagues, but there are plenty of alternatives to justify it 8D

Saf1 > cornerslide 05/18/2015 at 07:56

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And consequently is of lighter construction? Why would this be more suited than a plastic material for example?

cornerslide > Saf1 05/18/2015 at 17:20

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For home building it allows the structure to breath. The one thing about homes is that they have to allow for a certain amount of air exchange. It’s what keeps them from growing toxic mold in the walls.

Saf1 > cornerslide 05/20/2015 at 11:37

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Thanks bro, always good to have info like this from the experienced! Out of curiosity, what are the lightest woods that could’ve been used there?

cornerslide > Saf1 05/20/2015 at 16:38

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For the car application I can’t be sure. I don’t know if the lighter woods would really be good for something like this. It’s just a guess but I would say they would deteriorate too quickly. And by the way it’s my pleasure.