Aggressive Design Rear Diffuser

[Aevus]

More action on gen 5 forum so I'll post it here

so I'm thinking to make a custom rear diffuser, aluminum or titanium, and I'd like something with an agressive look while being efficient at the same time of course.

My question is, would it be a good idea to have horizontal plates, with a slight angle, between the plates so it makes some kind of air tunnels ? Or only vertical plates/wings are efficient?

I'm just thinking about some rear downforce since I don't have aero (gen 3 roadster)


can't really find the answer here https://en.wikipedia.org/wiki/Diffuser_(automotive)

[Aevus]

in fact, the design could very well be like the ''double-decker'' design in F1

https://us.motorsport.com/f1/news/banned-f1-tech-double-diffusers/4793557/

(which was banned lol)

[13COBRA]

Just buy one from AJ Hartman.

https://ajhartmanaero.com/modular-diffusor/

[Lawineer]

There is a lot that goes into diffusers and a little difference can make a big impact. It's not just a simple airfoil like most wings.
If you're really worried about functionality, I'd copy the ACR diffuser or do a lot of very detailed CFD. Even wind tunnel wouldn't be that great because you wont have the effect of the ground moving relative to the car.

Also, I'd definitely make it out of plastic, not aluminum or Ti. You want the strake to be the weakest link (and a cheap one). They're basically a wear item.

[Aevus]

There is a lot that goes into diffusers and a little difference can make a big impact. It's not just a simple airfoil.
If you're really worried about functionality, I'd copy the ACR diffuser or do a lot of very detailed CFD. Even wind tunnel wouldn't be that great because you wont have the effect of the ground moving relative to the car.

Also, I'd definitely make it out of plastic, not aluminum or Ti. You want the strake to be the weakest link (and a cheap one). They're basically a wear item.

looks like the one that 13COBRA is pointing out is made of carbon fiber, and strakes not modular

not exactly a cheap option for a wear item!


and yes, Lawineer, I'm sure you're 100% right about that whole diffuser thing being very tricky. The stock ones on my gen 3 roadster are very simple 1/16'' aluminum laser cut pieces

[Lawineer]

Yup, lol, just wrap it if you want it took like carbon.

[Aevus]

Stock ones. Very basic stuff, 2mm thick aluminum. Easy to make by laser cutting


53129

53130

you probably have 3x or 4x more surface on a gen 5 ACR...

[13COBRA]

Mine will be mounted up in the next few weeks, I'll post pictures.

[Aevus]

wow can't believe those exists

https://www.ebay.ca/itm/352363658218?


some more snake downforce, uh

[13COBRA]

wow can't believe those exists

https://www.ebay.ca/itm/352363658218?


some more snake downforce, uh

I bet you can source those through Autozone.

[Scott_in_fl]

Just buy one from AJ Hartman.

https://ajhartmanaero.com/modular-diffusor/

Sweet!!!

[TheMadMachinist]

Titanium????

What for the bolts?

Weil if you were able to cobble some fins up.

Just think of the pretty white sparks they would make when they drag on the pavement.lol

[Lawineer]

Titanium????

What for the bolts?

Weil if you were able to cobble some fins up.

Just think of the pretty white sparks they would make when they drag on the pavement.lol

I got Ti strips I'm going to cut up and make little "tabs" at the ends of my strakes to make white sparks :D

[Aevus]

Ti probably overkill since aluminum would be stiff enough I think...

that being said, why some choose carbon..? more expensive and fragile than Ti

[Lawineer]

Why use anything but plastic?

They don't bear any load

[Aevus]

Why use anything but plastic?

They don't bear any load

oh but there is probably some air pressure on these, especially at 120mph in Dallas

;-)

[TheMadMachinist]

Because Sparks.....lol

[Aevus]

Because Sparks.....lol

yesss, would do nice white sparks indeed
let's design an electric diffuser that can be lowered to touch the road

;)

[Matt Dillon]

Just buy one from AJ Hartman.

https://ajhartmanaero.com/modular-diffusor/

WOW, $2,500 that's Stupid Expensive & to me it doesn't even look that good! jmo

[13COBRA]

WOW, $2,500 that's Stupid Expensive & to me it doesn't even look that good! jmo


It's a lot less about look, and a lot more about function.

[Lawineer]

oh but there is probably some air pressure on these, especially at 120mph in Dallas

;-)

Not really. They direct air. They dont bear much load.