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Old 12-15-2017, 08:45 PM   #6 (permalink)
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Join Date: Dec 2014
Location: Butte, Montana
Posts: 665

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 24 AUTO
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.77 mpg (US)
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Originally Posted by jungle View Post
Thanks for posting your results. Even if they made the overall outcome worse. I wonder if the air damn was simply too aggressive? As much as I really like your stand off bolts, if you simply mounted the bronco air dam to the bumper of the dodge w/o your stand off extenders if your results would be better.

I don't understand why the Toyota leaves soo much tire exposed. One of the problem areas of my 2nd gen Dodge Ram I hope to address.
Too aggressive? Yes . In my opinion especially without having a belly pan in the front section between the air dam and the crossmember.
The air dam was the same width as the bumper. The bumper sticks 3 in past the sheet metal which sticks 3 inches past the tire for a total of 12 inch wider than the tread of the tires. More ideal would be like the Toyota pictures. Inset on the corners 1/3 Tire width and raised slightly as the Toyota was done for approach angle while dropping a tire in a rut / curb slash driveway. Yes rats I have to deal with in Montana as we have more miles of dirt road than paved Road and let's face it you can't go play in the woods if you can't drive on dirt roads for Street only minding approach angles you may be able to go straight down in front of the tire.
The 5 inch drop in the center was chosen as this is the bottom of the lower crossmember under the engine the 7 inch drop on the corners was chosen as this is the lower control arm height.
V1 prototype was just the 2.5" Bronco air dam bolted to the bottom of the bumper I did not notice a positive or negative change on the gravity drop acceleration test
1st gen cummins 91.5 dodge d250 ,HX35W/12
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 29.3mpg 97mi 3.311usg 7/27/16

'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg

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aerohead (12-16-2017)