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Old 08-29-2017, 07:16 PM   #8 (permalink)
gumby79
Master EcoModder
 
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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 2×4 AUTO
Pickups
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 427 Times in 278 Posts
You realy need the BSFC line to get an accurate guss from the Dino. I say guss becuse the dino run is at max fule making the info only accurate at full throttle. In over the road trucks more time at a medium acceleration takes more fule than a short time at medium-high(not max) rate acceleration to reach hi gear (low fule consumption /rpm) . Shifting too soon is bad to as this bogs the motor and takes more fule/time than if the same rate of acceleration in the correct gear slection. Early shifting will make your emissions equipment work harder as well. There are 2 ways to make boost. 1 shear rpm/cfm. 2 fule. At high rpm (read 60mph top gear) the air flow is sufficient to make boost. At low rpm cfm is to low to make boost so boost is made from over fueling.
Try shifting plus or minus 50-250 of were HPand TQ curves cross about 2200rpm for you and 2115rpm tor the modded rig. This x marks the spot to start and adjust to preference. In the '60s this x was the spot that yealded the best engen life and usually best economy.
__________________
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


Former
'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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