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Old 01-09-2020, 02:26 PM   #31 (permalink)
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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
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)
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Well done I see more progress.
The rotating mass reductions you have pursued add up to ~60#, I'd venture to guess equates to ~500-1000# of static weight reduction
Quote:
The 04.5-07 pistons have some special design for emissions
Non EGR CR Cummins duse not exist.
I found this out when researching parts for an 05 medium duty Cummins with a misbehaving EGR valve the wealth of information that is the internet could only tell me I was not seeing what was in front of me and EGR hit the Dodge/light duity in 04 the physical valve didn't show up until the 08.
Re cam the motor is the only way to remove the non cooled exhaust gas non-recirculating system. By closeing the exhaust valve early they were able to trap spent hot exhaust in the cylinder displaces fresh air on intake stroke making a valveless EGR
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Quote:
, I can pull 6th @35 mph running ~900 rpms. never a complaint unless the hill is too steep
How is the 64mm(?s364?) Spooling ,at the extreem low rpms?on grades(5-9%) my 91 with an hx35w12 with a Quick Spool Valve sends in a written complaint using smoke signals running less than 1263 RPM( 55mph in 6th 2ndOD.61, 3.55rear 31.7"tire) due to insufficient air to make power from the fuel causing a rich condition and overly high egts for throttle position and speed 850-1050 ,by 1050@10psi is turning black, drop to 5th(.71 1470 ) 650-750. Or run 66mph (6th.61 1516)and she spools 15-20psi depending on the grade.
IAT 70 ,that would be a wet dream -2to 20 above ambient with the itty bitty baby intercooler the first gen came with.worst seen so far this winter (its been mild) 11 air filter, 120 post compressor, 9f IAT @70mph crossing the ID/MT Continental Divide pass

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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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Old 01-09-2020, 03:23 PM   #32 (permalink)
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My setup (AFE exhaust mani + the HTT 64mm HE351) starts spooling (off ambient) at 900ish rpms. Seems like the only time there is no spool is off throttle.
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Old 03-04-2020, 09:41 AM   #33 (permalink)
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Update: Went back and entered in all the fuel receipts that I have in hand, (have them all, just not in one spot) averaged the monthly mpg across all months & over 32K miles the truck is averaging 21.1 mpg. The last 3 months on winter fuel in the PNW area (mild winter), it continues to average 21.

My 2nd air dam mount broke last week, for the 2nd time. Going to need to fab up a better mount for it. Interestingly, it is on the same side as the last time (passenger side) which is telling me there is more force on that side for some reason. Kind of a head scratcher, if anyone has any input on it I'm all ears.

other aero mods still in place, wheel wells, rear tire spats...the bed seals & rear bumper are off, need a permanent solution to the rear bumper issue.
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Old 06-14-2021, 11:45 AM   #34 (permalink)
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Update...

Came full circle on the rail pressure strategy and found I had bottomed out with the mpg's never really changing from the 20.5~21 mpg range. Would occasionally get 21.5. Decided to go the other direction with it and saw positive results right away getting into the mid 22's. Looking to go further I revisited the bed seal issue I had and decided to put those bed seals back in play but only down to the body line on the bed that goes the length of the truck. Effectively removing turbulence at the cab/bed area above that body line with everything below it was unchanged. I also reinstalled the 2nd air dam I built.

What that (2nd air dam & bed seals) gave me is the ability to now coast down a lot more hills that I couldnt otherwise (same as back when I was in the bet with co-worker). With 90 miles already on the tank, I milked the carp out of it and was rewarded with a 2nd best tank ever of 23.654 mpg's. Thinking that maybe 24's might be achievable on a regular basis as IATs are no where near ideal (70's to 80's, best for my truck is 95+).

Anyways, updated for the next guy...
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Old 07-06-2021, 08:41 AM   #35 (permalink)
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Another update...

Friday I made my own lower bed seal (to the cab) to finish off the 3 seal install that the newer rams have. Was surprised by how much farther I can coast before loosing too much speed. It made a noticeable difference.

It is all detailed in this thread... would need to go back to the previous friday in that thread for pics of what I did.

https://www.cumminsforum.com/threads...#post-29492601

After the install I short filled the tank so I have good data for 4 days of commute driving to compare against. Was surprised to get a 21.1 mpg out of the 125 miles on that tank. That is high for my truck given that 90% of the miles were all in town... (nothing is flat here so I get to coast a lot).

Looking at doing some ducted cooling changes in an effort to relieve the high pressure at the front of the truck. If that is successful then I also want to see about leveraging the heat extracted to feed a rear diffuser I plan to build a the back of the truck. The goal there being to help reduce the vacuum pull at the back of the truck. I think there is some decent gains to be had there if I can get the diffuser fed with air correctly. That is a long term project.

I did manage 3 tanks of 23.5-23.6 mpg's in a row, followed by a 22.x tank on a road trip, AC blasting on the return & both e-fans on. Not bad for a 7k # 4x4 truck (I think anyways). Walking up to my truck, you'd have to have an eye for aero mods to notice anything is different from the factory.

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