2004 Chevy Silverado 4x4 z

[aerohead]

Originally Posted by hoover

Thanks for the encouraging words. Slowmover, if you can access my album you will see more pictures of the truck. It has been fun and educational to try and build something functional and try to maintain the looks of the truck. I am still trying to get the hang of posting pictures, a problem for the computer illiterate like me. Thanks to everyone for pointing me in the right direction on this, just need a 10 year old to walk me thru it the first time. To Taco, my air dam is about 3 inches lower than need be, but I like the look and figure those nascar guys must have some reason for those huge spoilers. In my mind slippery for speed might also work for slippery for mileage. I can always shorten it if necessary. More changes are planned for the future.

A graduate student,Feisal Ahmed did an analysis of a RAM pickup.He found that below 6" and above 3" ground clearance,and airdam increased drag.Lowering it to 3" or below lowered the drag 1% (1/2% mpg).But that was for racing only,as it would never survive curbs,parking lot obstructions, or driveway ramps.
One member has already had to raise their airdam to restore their best mpg.