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Re: Improve aerodynamics for better mpK

Posted: Thu Dec 21, 2017 10:56 am
by imolazhp
Lower and add rear wheel skirts, might not be pretty (the wheel skirts) but would help with drag.

Re: Improve aerodynamics for better mpK

Posted: Tue Jan 02, 2018 6:08 am
by ecoangel
It was built to a price. CdA is actually no better than a 1990s Toyota Camry.

Lowering any car reduces effective frontal area no matter how badly designed the undertray is.

For down-force without a drag penalty then yes a flat bottom with proper diffuser is the way forward for race cars.

Re: Improve aerodynamics for better mpK

Posted: Tue Jan 02, 2018 6:10 am
by ecoangel
Nice pics Art,

Any more developments?

Re: Improve aerodynamics for better mpK

Posted: Fri Nov 08, 2019 3:19 pm
by electronchaser
ecoangel wrote:
Tue Jan 02, 2018 6:08 am
It was built to a price. CdA is actually no better than a 1990s Toyota Camry.

Lowering any car reduces effective frontal area no matter how badly designed the undertray is.

For down-force without a drag penalty then yes a flat bottom with proper diffuser is the way forward for race cars.
Hi ecoangel, sorry for bringing up an older thread, but I've been thinking about lowering the car on a new set of sports springs, which give about a 2cm drop up front. How much would a 20mm lowering reduce the frontal area, and thus drag. ( have one of the redesigned i3's with the new front end, 120ah ).

Many Thanks!

Re: Improve aerodynamics for better mpK

Posted: Wed Jan 22, 2020 12:43 pm
by Bertone
Re-opening this topic...

I believe the front of the i3 could have been made more aerodynamic by the BMW engineers.

If you look at the area between the front headlights and "kidneys", it is not a very smooth surface...in fact air will flow between the headlight and kidney and be trapped under the frunk area producing drag.

Perhaps those "holes" could be "filled" with, for instance, polystyrene to form a smooth surface. Also the kidneys can be made more smooth "filling them up"..

The difficulty is to make a perfect fit...but polystyrene is a light and easy-to-work with-material so perhaps it is doable.

What do you think? Just a crazy idea....??

Re: Improve aerodynamics for better mpK

Posted: Sun Jan 26, 2020 12:57 pm
by Boxbrownie
Bertone wrote:
Wed Jan 22, 2020 12:43 pm
Re-opening this topic...

I believe the front of the i3 could have been made more aerodynamic by the BMW engineers.

If you look at the area between the front headlights and "kidneys", it is not a very smooth surface...in fact air will flow between the headlight and kidney and be trapped under the frunk area producing drag.

Perhaps those "holes" could be "filled" with, for instance, polystyrene to form a smooth surface. Also the kidneys can be made more smooth "filling them up"..

The difficulty is to make a perfect fit...but polystyrene is a light and easy-to-work with-material so perhaps it is doable.

What do you think? Just a crazy idea....??
Don’t forget to tape over all the shut lines also :lol:

Re: Improve aerodynamics for better mpK

Posted: Sun Jan 26, 2020 6:55 pm
by eNate
Bertone wrote:
Wed Jan 22, 2020 12:43 pm

I believe the front of the i3 could have been made more aerodynamic by the BMW engineers.

...

What do you think? Just a crazy idea....??

Careful there, or we'll be all driving Honda Insight look-alikes! :D

Re: Improve aerodynamics for better mpK

Posted: Mon Jan 27, 2020 2:39 pm
by alohart
eNate wrote:
Sun Jan 26, 2020 6:55 pm
Careful there, or we'll be all driving Honda Insight look-alikes! :D
Having owned a 2000 Honda Insight for 15 wonderful years, I resemble that comment :lol:

Re: Improve aerodynamics for better mpK

Posted: Tue Jan 28, 2020 9:44 am
by robthebold
Boxbrownie wrote:
Sun Jan 26, 2020 12:57 pm
Bertone wrote:
Wed Jan 22, 2020 12:43 pm
Re-opening this topic...

I believe the front of the i3 could have been made more aerodynamic by the BMW engineers.

If you look at the area between the front headlights and "kidneys", it is not a very smooth surface...in fact air will flow between the headlight and kidney and be trapped under the frunk area producing drag.

Perhaps those "holes" could be "filled" with, for instance, polystyrene to form a smooth surface. Also the kidneys can be made more smooth "filling them up"..

The difficulty is to make a perfect fit...but polystyrene is a light and easy-to-work with-material so perhaps it is doable.

What do you think? Just a crazy idea....??
Don’t forget to tape over all the shut lines also :lol:
I think caulk would be even better, combined with taking a green sharpie to the edges of the windows.

Re: Improve aerodynamics for better mpK

Posted: Fri Jan 31, 2020 9:00 pm
by PVEVman
Just rip off the side mirrors and use cameras. Put the screens in the corners of your dashboard and you should have better rear view vision too, without dead zones!