Quote:
Originally Posted by fjasper
A little rounded hump right behind the windshield might help. It looks like the roofline slopes, so a small hump could smooth the transition, reduce pressure drop, improve pressure gradient on the roof, and leave you with more energy to make the curve onto the Kammback, without increasing the profile. I've seen something like it on the front of a bus, IIRC.
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If it's like most rigs, especially 4WD, the undercarriage is probably where you'll find the biggest easy gains, though. Air dam is quick and easy, belly pan allows for better diffuser performance and better ground clearance. Steep approach angle on the jeep should make the air dam less likely to scrape than on other rigs.
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I didn't get a good look at the picture before, it looks like it already has a nice smooth windshield-roof transition. So nevermind.
If the undercarriage is very rough-exposed solid rear axle, big stuff hanging down into the airflow, I'd do belly pan first. Higher ground clearance vehicle like this, the belly pan will almost certainly work better than an air dam, plus it makes your tail treatments more effective. (Hucho)
If the belly is like on most new cars, reasonably flush and even, probably tail treatment will give the biggest gain.