Quote:
Originally Posted by Joenavy85
how's this look??
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It looks awefully steep on the top. You want a smooth transition into about a 15 degree angle. I did a 4 foot kamm back on my car and realized a 6% improvement in MPG (12% drag reduction). Also if you have roof racks, you will want them off when the boat tail is on. Removal of the roof racks can be a 3% (or there abouts) improvement in MPG, and the boat tail will have much smoother flow coming into it.
I also cleaned up the front end of the car with a grill block (over 50% blocked), and a belly pan that goes to the firewall. This was also good for about 6% MPG improvement.
If you remove the roof racks, and have attached flow on your roof (easy to test with tufts of yarn and some tape, window down and mirror in hand at 35 mph with NO TRAFFIC) you will be good to go on the boat tail, as long as you follow the above advise.