yeah,but iv survived just fine with vehicles not equpped with A/C in the past,so i think i can get by buy keeping the extra fuel in the tank.
i had a feeling this may not be something easy to do.since the a/c is now unplugged for the winter perhaps i'll just unhook that jumper i placed in the low cutoff switch connector so the controller just don't control my e-fans at all for now.
eventually,i will want MIX and DEFROST to work,yet not turn on my e-fans either.so i'll have to get digging and see if i can find out how to bypass those two settings from controlling the power to the a/c compressor.
if i just wanted to run a switch and make it work,i would just bypass my e-fans wire directly to that rather than using the a/c
s power.i'll figure it out somehow lol.
i'll probably have to hunt down an entire a/c schematic to find out what i need to do.or perhaps i will be SOL and its all done internally in the switch,which would kill my idea on keeping everything auto,yet function the way i want it.
all simply done if it wasn't for wanting the e-fans to run when i tuned on either of the A/C settings, yet nothing else.

 

a hypermillers tweak or just a good storage case for my pole saw?

im hoping both!
now i just need a couple end caps.
that's 8" ADS (Advanced Drainage Systems) plastic culvert.it's very thick and rigid.
good place to hold a spare fan belt,fuel filter etc up in one end.i can drag 'em out with my pole saw,or i'll use two end caps that can both be removable so i can reach in each side would be wisest i guess.i can screw a couple eye hooks on each side,and use a bungee strap to keep the caps in place,but im getting off from the aerodynamics part of it now lol.
anyway,i figure it has to be better than dead hitting a flat wall up there,if not all's good as it still makes a good tool carrier.less to unload for dumping,the better.

perhaps an RV deflector up there would still help push her up another .1 - .5 mpg i dunno.i mainly only go 40-45mph avg.

if i had an extended cab,i'd have more room to rig up something to divert the sides a bit.probably id use the same stuff.can't do that with the reg cab though or i couldn't open the doors.
im gunna try a couple 4" PVC pipes up and down,the outer sides to divert a little more air.

............
on another note;
e-fan conversion details:
https://www.ford-trucks.com/forums/9...ml#post9914738



spare timing meter for parts should be here Monday.so i'll have some reports/results to share what current settings are and what i can tweak out of playing with that too hopefully soon.

come on 16 MPG real world avg diesel dually dump!

 

Dude!....Somebody screwed a sewer pipe to your truck!

Seriously, that should make a good,out-of-the-way storage vessel. Plus dirt bags might not think to steal stuff out of it.
Can't hurt with aerodynamics either, like you said.

 

I saw a Jap delivery truck today at work with a cowl/air ramp thingy on it. It looked pretty neat and would serve your purpose exactly. I thought of you when I saw it. I would have taken pictures but I was in a rush and he was leaving anyway. It basically swooped from the top of the cab to flush with the box. Similar to what some big rigs have. Maybe you could salvage the same thing and install it on the F250?

 

in other news;while the IDI performance record has been broken yet again (by a good increase too!) im still crawling off the line after every stop & poking along @ average speeds of 40- 45 mph (1200-1400 rpm in OD minus on the hills of course.)


starting on some aero mods now thanks to some help over on ecomodders fuel economy forum.david85 stopped in to help me out too! so i started with one of his and others suggestions to clean up the stake sides.

front air dam,side skirts,and some sort of tail type foldaway wings on the rear will be next on the list.
for the rear.here's the idea:
Trailer Tail Improves Miles Per Gallon

DRW tire hop issue fixed,and solved my fuel economy problem.
after replacing the ip,and not seeing anything pop out at me,my next fuel up,i run up to a 3rd tire shop where luckily i found a guy who looked everything over good for me and solved the issue.fuel economy shot right up,showing my recent mods such an electric fan swap/synthetic oil/perhaps a bit from the culvert tool holder etc.
the truck felt so free and smooth,the rear tire issue had progressively gotten worse over time,that i almost forgot how the truck should go!
now with a smooth truck,i headed home to double check my timing,and adjust the TPS to hold OD longer.since the truck rolls so much easier,i didn't need it to kick down to 3rd so soon.this helps too.

no fuel records yet with the aero mod,but soon.
things are looking up! im heading in the right direction again after a long progressive downward spiral.
Ford Truck Enthusiasts Forums - Garage FillUp Listing

if anyone with a large utility/stake side bed,etc wants to follow along,and or copy some ideas provided.be sure to check it out.because i doubt i'll do every suggestion there,where as you may be interested in some i don't do;
aerodynamic improvements; diesel,dually,dump - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com

 

have you ever considered semi shell? the flares some semi's have from the back of the cab to extend as wide as the trailer? in your case you could make it so that it could be attached to the dump bed and come close to flush with the door and fit tight over the top of the cab so it doesnt let air deflect between the cab and box. duno if it would mean much improvement but who knows

 

lol my truck gets 18 mpg in sig
but if its windy i get like 12 for some reason
and back roads with lower rpms get better milage

 

What is that stuff you put on XLT?

 

3/16 In. x 48 In. x 96 In. Tempered Hard Board
it probably should have been coroplast (plastic sheets) so it would last longer.
but i just grabbed some stuff at home depot,and primed and painted it.
this light weight stuff here:
3/16 In. x 48 In. x 96 In. Tempered Hard Board - 832780 at The Home Depot
i guess as long as i keep it painted,it may last a couple years.

 

Oh ok. I thought is was that. Looks nice.

 

So before I left back to Iraq in February...I was averaging 19 mpg in town in the 84, and 16 in 4 HI. Sound about right? I found out that dropping the tailgate completely improves mileage(at least for me by about 1~2 mpg dependant on how I drive) What you guys think?

 

My buddy Jared took off his stock rear bumper, and stock front bumper and replaced with heavier duty one in the front and a fab'd one in the rear(C-Channel rear and A Diamond plate steel beam covered front) and it lowered his front end a little bit from the extra weight and he said he gets better mileage than before. Aerodynamics possibly?

 

What's your highway speed?

I've never been able to conclusively test that tailgate theory for myself. Whenever I had my tailgage down, I also had some railings stretching out behind the truck. Whenever I was empty enough to not have to do that, the tailgate was up. Mythbusters' test on the issue was with an 04 model F150 crewcab if I remember right, and those trucks have pretty short boxes so it might make for a difference in how they perform compared to our "real" trucks with 8' long boxes. The F150 also has a different windshield rake and higher beltline so its hard to compare against that.

We'll see what happens this summer but I'd like to test with the gate up, down and removed completely. If I really get ambitious, I could also look for (or make) a bed cover to see what that does.

 

I think its illegal to drive with your tailgate down. At least around here.

 

Its definitly not illegeal in montana....I do it all the time, I see cops in their trucks doing it.

David, I travel at about 65-70 depending on how tall I am feeling that day, night or anywhere in-between. I did it with the tailgate on, no cover, tailgate off, tailgate lowered. My best result was the tailgate off, I also replaced the rear shocks, giving the 84 the extra height in the rear, for some reason that seemed to help as well.