Increase aero dynamic?

[Mikeez]

Is there ways to increase aero dynamic, in other word reduce coefficient of drag ?

1. Underpanel?
2. More downforce?
3. Replace rear diffuser?

New research

[swarb]

1. yes. jdm underpanels give -.01 drag co-efficient
2. no, downforce=drag
3. yes, clean the air from the back.

don't for get about aero fender fins, aero mirrors, trd rear trunk garnish, front lip/splitter, canards, blocking out foglights/turnsignals.

[Mikeez]

Front lip/splitter & canard are downforce mods? The rest I agree.. foglight is ugly

[Figo]

WAX

[Gunman]

Originally Posted by Mikeez

Front lip/splitter & canard are downforce mods? The rest I agree.. foglight is ugly

Yes, splitter should add downforce, but generally with a low drag penalty, sometimes it can reduce drag too.

Dive planes, aka canard's again should add downforce, and drag, BUT can reduce some other drag, by redirecting air.

Aero isn't a drag or downforce type of thing, it's always going to be both, and a change one place on the car, can affect the aero at another. That's why race teams look at the L/d, ie lift vs. drag, and try to find the most downforce with the least amount of drag penalty. Compromises have to be made to get the aero balance you want too.

[Mikeez]

Originally Posted by Gunman

Yes, splitter should add downforce, but generally with a low drag penalty, sometimes it can reduce drag too.

Dive planes, aka canard's again should add downforce, and drag, BUT can reduce some other drag, by redirecting air.

Aero isn't a drag or downforce type of thing, it's always going to be both, and a change one place on the car, can affect the aero at another. That's why race teams look at the L/d, ie lift vs. drag, and try to find the most downforce with the least amount of drag penalty. Compromises have to be made to get the aero balance you want too.

I agree with what you've said. Aerodynamic drag is the drag related to air! Anyways, I got the idea of what to do..

Cd = 0.27

That's pretty good. My goal is 0.20 flat.

[swarb]

Originally Posted by Mikeez

I agree with what you've said. Aerodynamic drag is the drag related to air! Anyways, I got the idea of what to do..

Cd = 0.27

That's pretty good. My goal is 0.20 flat.

how are you going to test it?

[aznatama]

good luck... FWIW,

Prius is 0.25, Tesla is 0.24, and the CLA is 0.22. The only cars below that are the fugly VW XL1 and Ford EV1 at ~0.19.

I don't think you'll get much lower without custom flat underpanels and rear wheel covers...

[7thgear]

Originally Posted by Mikeez

Front lip/splitter & canard are downforce mods? The rest I agree.. foglight is ugly

anything that creates a greater difference between over and under car pressures..... creates downforce.

[mav1178]

Originally Posted by Mikeez

That's pretty good. My goal is 0.20 flat.

You should seriously consider selling your car and getting something else if you want that low of a cD.

-alex

[Gunman]

Originally Posted by Mikeez

I agree with what you've said. Aerodynamic drag is the drag related to air! Anyways, I got the idea of what to do..

Cd = 0.27

That's pretty good. My goal is 0.20 flat.

That is a pretty hefty goal! I think you'll have to remove mirrors, tape the seams, and close up the grill a lot (cooling drag is a killer).

[SolemnWishes]

Originally Posted by aznatama

good luck... FWIW,

Prius is 0.25, Tesla is 0.24, and the CLA is 0.22. The only cars below that are the fugly VW XL1 and Ford EV1 at ~0.19.

I don't think you'll get much lower without custom flat underpanels and rear wheel covers...

Those numbers are accurate to my mental recollection.

[jvincent]

Originally Posted by Mikeez

My goal is 0.20 flat.

Just curious, why?

[brandonblt2]

Originally Posted by Mikeez

I agree with what you've said. Aerodynamic drag is the drag related to air! Anyways, I got the idea of what to do..

Cd = 0.27

That's pretty good. My goal is 0.20 flat.

Youre going to need to redesign the whole body of the car. Youre better off buying a different car all together.