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Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

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Old 07-22-2007, 12:23 PM   #1
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To Change or Not to Change

When you modify your car in any way, you are changing the original design and the vehicle's overall characteristics. Sometimes that is a good thing, while other times it can lead to negative results. Below is a list of common modifications and their estimated change in percentage of the overall drag coefficient (Cd) of an average car. For example, the outside rearview mirrors add a two to four percent increase in the Cd. However, it should be noted that your results may vary.

Modification % Change

Lowering the vehicleby 30mm approx. -5
Smooth wheel covers -1 to -3
Wide tires +2 to +4
Windows flush with exterior approx. -1
Sealing body gaps -2 to -5
Underbody panels -1 to -7
Concealed headlamps +3 to +10
Outside rearview mirrors +2 to +5
Airflow into the enginecompartment +4 to +14
Brake cooling devices +2 to +5
Interior ventilation approx. +1
Open windows approx. +5
Open sunroof approx. +2
Roof-mounted surfboard rack approx. +40

from : http://www.europeancarweb.com/tech/0...de/tables.html
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Old 07-22-2007, 02:52 PM   #2
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what is "concealed headlamps"?
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Old 07-22-2007, 03:23 PM   #3
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I think that it's saying that a car with concealed headlamps increases its Cd by 3 to 10% when they are popped up. Just my guess.
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Old 07-22-2007, 05:57 PM   #4
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ah ok i didnt think of that, and i understand how it would do that, miatas are pretty bad...

back to the guide: its a good set of opinions.
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