Extended air dam... - Page 3 - Fuelly Forums

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Old 03-23-2010, 08:09 PM   #21
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This is with the engine belly pan (silver piece) in place. The transition from the air dam to the main belly pan is from 9" ground clearance to about 11" ground clearance.
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Old 05-06-2010, 12:38 AM   #22
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Increasing the frontal areas will cause more drag. To be effective down that low the vehicle has to be lowered as far as reasonable first.
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Old 05-06-2010, 07:29 AM   #23
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Air dams have proven to work well for some people. The theory is that the frontal area isn't increased much, especially on a truck with solid axles that have huge pumpkins; and keeping the air out from the bottom of the car (which is not engineered with aerodynamic drag in mind) saves more than the frontal area wastes. You're pushing the air around the sides and over the top which are designed to flow air with minimal drag.
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Old 07-11-2010, 10:20 PM   #24
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Now that it's gotten hot here...I had to revamp the lower air dam a little...

I had to open up the area fer the trans coolers and slapped a gutter guard as a grill...

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Old 08-05-2010, 05:07 AM   #25
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Re: Extended air dam...

It appears that you press a lot of air out of the way. You may wish to consider the angle of that part so low that not only would push the air from the road, and add to the flow of your truck.
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Old 08-14-2010, 02:23 PM   #26
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Re: Extended air dam...

Got a high of 26.45 mpg during my run out to Los Angeles from Houston. Not bad at all...
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Old 08-20-2010, 11:52 AM   #27
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Re: Extended air dam...

Got another high...28.25mpg at 60mph on my return run from Los Angeles back to Houston.
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Old 08-23-2010, 06:19 PM   #28
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Re: Extended air dam...

Nice Job! You might want to consider blocking off your upper grille opeming and adjusting your lower opening for optimal cooling .
I just visited Texas ( DFW area ), driving my Jag from Livermore CA ( near SF ). I averaged over 30MPG for the trip despite 75mph+ speeds.
Best wishes L&S
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Old 08-26-2010, 06:49 AM   #29
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Wink Re: Extended air dam...

Quote:
Originally Posted by low&slow View Post
Nice Job! You might want to consider blocking off your upper grille opeming and adjusting your lower opening for optimal cooling .
I just visited Texas ( DFW area ), driving my Jag from Livermore CA ( near SF ). I averaged over 30MPG for the trip despite 75mph+ speeds.
Best wishes L&S
Thanks fer the suggestion...but the most I can block the upper grill is 2/3rds and the lower grill opening doesn't reach the radiator/AC condenser.
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Old 10-23-2010, 07:52 PM   #30
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Re: Extended air dam...

Added the lower grill block back in. The bottom opening is now 3 slots vs the previous 2 slots. Need to put some openings in fer the auxiliary trans coolers. I'll use some aluminum flashing to block those off when cooler weather/winter rolls in. I might even put some 92mm high flow computer fans to work in there, too.



I still have to redesign my air dam belly pan since the previous one got broken off when I hit an extreme angled driveway ramp.
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