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Old 07-19-2017, 10:09 PM   #24 (permalink)
Master EcoModder
gumby79's Avatar
Join Date: Dec 2014
Location: Butte, Montana
Posts: 725

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: 20.76 mpg (US)
Thanks: 208
Thanked 425 Times in 276 Posts
You said track days ... what form? Makes a difference on what is good V bad. Like everyone has stated test test then test some more. Tuft tests to determine if it is a spoiler or a factory aero mod. If your into drag racing then converting to a Bonneville spoiler could be an option for down force and aero+. I saw many last time to the drags in Utah.
If road corse then any down force at any cost may be worth the inproved times look at time attack cars they use this principle.
Aerodynamic visualisation fluid( clay disolved in water) will also show the points were the air separation is happening and then were reattachment occurs... like how after a snow storm your car is covered in road spray that almost always has the same patterns .
Aba on a set corce preferably 3gal or more to make the filling discrepancies (.001-.01) a smaller % value (makes for less noise in your results). If posable data log through a Obd2 dongle device. Useful at the track too.
1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20

'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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