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-   -   Aerocivic - how to drop your Cd from 0.31 to 0.17 (https://ecomodder.com/forum/showthread.php/aerocivic-how-drop-your-cd-0-31-0-a-290.html)

basjoos 12-12-2007 09:54 PM

Aerocivic - how to drop your Cd from 0.31 to 0.17
 
New... Aerocivic has a web site: www.aerocivic.com

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I started this project after the Katrina-insired gas price runup since I have a long commute. I first learned to drive during the 1970's oil embargo and have been perfecting my hypermiling tenchniques ever since. My car is a 92 Civic CX, which I bought new, and was giving me low 60's to low 50's before I started aero modding it.
Side view
http://ecomodder.com/imgs/aerocivic/BoatRebuild15.jpg
Side view with open hatch
http://ecomodder.com/imgs/aerocivic/BoatRebuild11.jpg
Rear view of boattail
http://ecomodder.com/imgs/aerocivic/BoatRebuild12.jpg
Cargo area inside boatail, extending the interior of the car into the boattail added 20cu ft to the interior space. Also there is a hidden compartment under the new load floor in the boattail.
http://ecomodder.com/imgs/aerocivic/BoatRebuild13.jpg
Radiator inlet slot (coroplast has since been replaced with aluminum sheet)
http://ecomodder.com/imgs/aerocivic/GrillSlot.jpg



The end result is a car with such low drag that the results of coastdown testing is linear out to 90mph (it coasts almost as well at 80mph as it does at 50mph). I have to get it over 90mph before I start to feel the wind load from high-speed driving. OEM max speed was 95mph. I have had it up to 100mph with plenty of power remaining at that speed (estimated top speed of about 140mph). Wind noise is much reduced from stock. Approximate mileage on a flat road at 85F, 95mpg at 30 to 65mph, 85mpg at 70mph, 65mpg at 80mph, 50mpg at 90mph.

Additional mods planned, include replacing the current one-size-fits-all radiator inlet slot with a driver-adjustible radiator door. Eventually I plan to automate the door by using a Basic Stamp or similar process controller to monitor the coolant temps and adjust the opening to the actual cooling needs.

Most of my driving is at night, especially in the winter, and night driving is costing me 2 to 3 mpg in additional electrical load from the lights. About half of this loss is from the parking lights, the remainder is from the headlights. I want to replace the parking and dome lights with LED's. Since retrofit LED headlight kits are still several years off, I want to investigate installing a switch to kill one of my headlights and/or a dimmer control to reduce the headlight's intensity and power drain for situations where I don't need the full intensity of the headlights for visibility.

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basjoos 12-12-2007 10:02 PM

More pics:
Side view of nose, front wheel spoiler, and front wheel well skirt (nose and skirt are now aluminum sheet, spoiler is still coroplast)
http://ecomodder.com/imgs/aerocivic/aero15.jpg
Front view of front wheel spoiler
http://ecomodder.com/imgs/aerocivic/aero12.jpg
Side skirts made of coroplast (there are 2 side skirts on each side, one even with the inner edge of the tires, the other even with the outer edge of the tires).
http://ecomodder.com/imgs/aerocivic/aero14.jpg
Rear wheel spoiler (coroplast)
http://ecomodder.com/imgs/aerocivic/CivicCaS.jpg
Underbody panelling (coroplast and aluminum flashing, I plan to replace it with alumunum sheet whenever I next need to remove the panelling for service).
http://ecomodder.com/imgs/aerocivic/aero7.jpg

basjoos 12-12-2007 10:08 PM

More pics:
Conveyer roller inside of front skirt
http://ecomodder.com/imgs/aerocivic/CivicBd.jpg
Front skirt slightly open with wheels cuts all of the way to the left.
http://ecomodder.com/imgs/aerocivic/CivicBc.jpg
Windshield wiper windscreen
http://ecomodder.com/imgs/aerocivic/...Shieldside.jpg
Fairing behind muffler
http://ecomodder.com/imgs/aerocivic/MufflerFairing.jpg
Interior side rear view mirror (replaces deleted exterior side rear view mirrors)
http://ecomodder.com/imgs/aerocivic/Mirror.jpg
Low-tech hand throttle
http://ecomodder.com/imgs/aerocivic/Handthrottle.jpg
SuperMID
http://ecomodder.com/imgs/aerocivic/SuperMID.jpg
Another view of the car
http://ecomodder.com/imgs/aerocivic/CivicView.jpg



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Lazarus 12-12-2007 10:23 PM

Very Nice.:turtle::turtle:
Basjoos how many hours do you think you have in it to get it to this point?

basjoos 12-13-2007 07:51 PM

Probably about 250 hours and a materials cost of about $400 spread out over the past 2 years. It has paid for itself in fuel savings several times over.

igo 12-13-2007 08:44 PM

Basjoos. I haven't seen pictures of your car for a while. I see the boat tail has been improved in looks and function.

What did you use for the rear window?

I have to give credit to you. Areo moding a civic to the max is not an easy undertaking.

basjoos 12-13-2007 09:37 PM

The rear glazing is Lexan. Once I conclusively proved the FE benefits of the boattail on my car, I rebuilt it with more durable materials (aluminum sheet and Lexan) than the original prototype was built of (coroplast and clear vinyl) as well as utilizing the additional space enclosed by the boattail..

newtonsfirstlaw 12-13-2007 10:46 PM

Quote:

Originally Posted by basjoos (Post 2169)
The rear glazing is Lexan. Once I conclusively proved the FE benefits of the boattail on my car, I rebuilt it with more durable materials (aluminum sheet and Lexan) than the original prototype was built of (coroplast and clear vinyl) as well as utilizing the additional space enclosed by the boattail..

Is there anything to note when working with Lexan? I have clear vinyl on mine, but maybe I'd replace it.

MetroMPG 12-13-2007 11:28 PM

Hey basjoos -

LOTS of visitors coming in from other sites right now - check the hitcount on this thread relative to some others.

If your car draws anywhere near this much attention in real traffic, you must have to be VERY careful around the rubberneckers!

basjoos 12-14-2007 02:57 PM

I used 1/8" Lexan, which can be drilled, sawed, and bent into a curve as needed.

I sometimes have a problem with rubberneckers piling up and backing up traffic alongside my car. But the worst are the few who can't drive in a straight line while they are staring at something alongside them and start curving into my lane.


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