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Old 08-27-2022, 05:33 PM   #1 (permalink)
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Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
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Effects of extensive aeromodding.

From 2005 to 2020, I drove and commuted year around in a 1992 Honda Civic (Aerocivic) that I extensively modified to reduce its Cd from it original 0.34 to a low of 0.17. Here are a couple of things that I noticed along the way:

The mileage and range improved, rising from its original high 40ís mpg summer, low 40ís winter to low 70ís summer, high 60ís winter. Range increased from the low 400ís to over 700 miles. Maximum speed increased from around 100 mph to 140 mph. I had the same aero drag at 70 mph that I used to have at 45 mph.

It acted as a horsepower boost at highway speeds. It had almost no effect on my 0 to 60 mph time, but had a huge effect on my 60 to 100 mph time.

The car was much quieter. Wind noise was greatly reduced, especially with the deletion of the external driverís side mirror located about 2 feet from my ear. Road noise was also greatly reduced, much of it being generated by turbulent airflow under the car that was eliminated by the smooth underbelly that I installed.

With most cars, air drag starts to become noticeable around 70 mph (60 mph with trucks), especially noticeable when coasting on downhills when it is slow to gain speed at highway speeds. On the Aerocivic, the air drag didnít become noticeable until around 100 mph and it would gain speed quickly when coasting on downhills at highway speed. It took very little effort from the engine to maintain highway speeds.

The car stayed much cleaner. The dirtiest parts of a carís surface are those subject to turbulent air flow, such as the flat surfaces on the rear of the car and around the wheel well openings. With a full boat tail and wheel well covers, the car stayed much cleaner. Itís rounded front also didnít collect the load of dead bugs that the flat front bumper and grill do on normal cars. An occasional big beetle would ping the windshield, but most insects were carried up and over the top of the car in the smooth airflow without splatting.

It was much less hazardous to wildlife. Birds flying low right in front of the car in what used to be the ďkill zoneĒ were now carried up and over by the smooth airflow. With deer, the rounded and sloped front of the car acted as a wedge to lift them up and over the top of the car, causing little damage to the vehicle (but would have been hazardous to anybody tailgating me). I handled two deer in this manner compared to the extensive front damage incurred in two previous deer collisions before I aeromodded the car.

It created much less of a dust plume when driving down a dirt road, less of a water mist trail when driving on a wet road, and less of a turbulent snow trail when driving through snow.

Normal cars use the difference between the high pressure at the front of the car and the low pressure at the rear to move ventilation air through the carís cabin when the vent fan isnít running. As my carís Cd dropped, this pressure differential dropped, this airflow dropped almost to zero, so I had to run my vent fan on low to get any air movement through the cabin.

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Old 08-27-2022, 07:12 PM   #2 (permalink)
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Similar to my experience living in a geodesic dome. It was the cleanest, quietest and warmest habitation I've experienced. All due to the aerodynamics.

The cabin air flow is an unexpected result.
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Old 08-27-2022, 08:58 PM   #3 (permalink)
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Do you have a whole list of all the mods you did and their impact? Without linking to a whole entire forum?
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Old 08-27-2022, 09:13 PM   #4 (permalink)
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Quote:
Without linking to a whole entire forum?
Why make it difficult? Ain't nobody gots time....

The front page of aerocivic.com is exemplary.
Quote:
Overview:
  • Background - the car & aero influences
  • Research & construction
  • Coastdown testing to calculate Cd
  • Update: lean burn engine installed for more MPG
  • What fuel economy does it get?
  • What's it like to drive?
  • Compared to "regular" cars...
  • Aero observations: bugs, leaves & deer
  • The aerodynamic modifications in detail
  • Cost
  • Aerocivic media coverage & links
  • Other aeromodded vehicles
Scroll down about 60%, if you can be bothered.
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Old 08-28-2022, 11:37 PM   #5 (permalink)
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Quote:
Originally Posted by freebeard View Post
Why make it difficult? Ain't nobody gots time....

The front page of aerocivic.com is exemplary.

Scroll down about 60%, if you can be bothered.
didnt know there was a website. thanks a lot for that. only had seen the 10000000 page forum timeline before
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Old 08-29-2022, 12:18 PM   #6 (permalink)
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Sorry for the snark.
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Old 08-29-2022, 01:56 PM   #7 (permalink)
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Wish the website had more details on the boat tailing or side skirts or how the underside was made smooth. But it’s definitely an inspiration.
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Old 08-29-2022, 02:03 PM   #8 (permalink)
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basjoos is active on the forum and there exist Personal Messages.

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