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Old 03-17-2012, 01:07 AM   #11 (permalink)
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the hood and roof of a car acts like a wing on an airplane lifting on the car. The faster you go, the more lift you get. On top o that (or underneath actuallY), air is stacking up underneath the car with a high pressure, low velocity airflow.

The splitter on the front is an attempt to keep air out from under the car. The back of the car is left open so the road acts like a pump trying to get air out from under the car. The goal is a low pressure area is built under the car.

So, the roof is lifting the car. any downforce from the splitter offsets the roof lift.

From MPG standpoint, splitter keeps air out from under the car leading to better mpg.

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Old 03-17-2012, 08:24 AM   #12 (permalink)
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Am I correct in saying if the air dam & splitter do not increase frontal area, then they will aid fuel economy, otherwise any further down they then become high speed racing mods to stop the vehicle taking off at over 150km/h and will be a fuel expense because frontal area is greater.
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Old 03-17-2012, 09:34 AM   #13 (permalink)
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Quote:
Originally Posted by Tesla View Post
Am I correct in saying if the air dam & splitter do not increase frontal area, then they will aid fuel economy
An air dam that slightly increases frontal area, can still give an aerodynamic improvement due to the reduced amount of air going under the car.
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Old 03-17-2012, 04:01 PM   #14 (permalink)
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Originally Posted by euromodder View Post
An air dam that slightly increases frontal area, can still give an aerodynamic improvement due to the reduced amount of air going under the car.
Thanks, so is there a rule for how much or is it just a case by case basis depending on layout under vehicle?

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