visor killing MPGs? - Dodge Diesel

user name · 12-04-2011, 09:45 PM

I consistently get 17-18 mpg with my 93 and feel like it should be a little better given my normally easy driving (under 2000 RPM) and rarely under 20 mile drives. It seems like everyone I talk to do better than me and most of them have 4wd. I know this isn't bad mileage but it's not great either.

Also the truck is well maintained with recent valve adjustment.

BILTIT · 12-04-2011, 10:32 PM

Probably your trans, what convertor?

93-12Smoke · 12-05-2011, 04:55 AM

Seems like the guys with the autos get a little worse mpgs. Would hate to see the size of that visor if it's killing mileage!

Douglas2 · 12-05-2011, 11:41 AM

hey-Hey!!!,
I have a visor on my 1990 and see 24-25 on my back and forth to work commute( ~30 mi one way ). I have the .73 OD in the NV5600 and 3.07 axle and keep speed between 65 and 70.
cheers,
Douglas

wannadiesel · 12-05-2011, 12:21 PM

What is the terrain like in your area? I agree that there is something up, running that slow you ought to be doing better. Where is your timing set?

Sent from my HD2 using Tapatalk

sootnsmoke · 12-05-2011, 01:12 PM

I would think it should be better as well considering your gearing, 2wd and SRW. I get consistenly between 17.5 and 18.5 MPG with mostly highway miles over flat terrain. That MPG is with a dually, 4.10 gearing, 4x4, 5 speed manual, stock timing. Also, keep in mind that I have NO sunvisor though

user name · 12-05-2011, 04:04 PM

The timing is stock as is the trans and convertor. I have a couple of friends that put the visors on gas trucks back when they were newer and both said they had a noticable drop in milage. I can see it your basically putting a brick wall in the only arodynamic part of they old truck. My drive to work is close to flat with one decent hill up and back down but not mountains or anything. I run 55-60 mph and turn about 1600 RPM. I would think over 20 at least in the warmer weather should be possible.

wannadiesel · 12-05-2011, 08:04 PM

Bump the timing and see what that does.

Sent from my HD2 using Tapatalk

1STGENFARMBOY · 12-05-2011, 09:16 PM

Thats the same MPG i get driving the same distance and driving habbits, i have never got better than 18.5, that was a full tank of 60-65 on flat ground, yes it is a 4x4 auto,3.54,s and as of lately i think my converter is getting very very tired as i have seen even more of a drop of about 2 mpg, 15-16mpg and a rise of 150rpm at crusing speed (60-65)

how many stop and goes?
flat ground?
keeping tire psi up?

i'm hoping when i get on my visor mine don't drop any more.

Dar

apwatson50 · 12-06-2011, 09:58 AM

maybe I will have to remove the visor from the ford. it probably only gets ~15-16.

#2isgreen · 12-06-2011, 02:55 PM

I've learned never to follow what the door jamb says for tire inflation. I always read the max pressure stamped on the sidewalk and stay about 5 psi under that. Makes for a harsh ride but yields as many as 3-5 extra mpg. From experience.
Your OD is working right?

user name · 12-06-2011, 06:32 PM

I run 80PSI all around and everything seems to work right. It also finally started snowing here so getting a good real number probably won't happen for a while again. I think it's time to bump the timing and rebuild the trans with a better trans. That or finish the 4x4 and sell this one.

user name · 12-06-2011, 06:33 PM

Also I duct taped up my totaled status up and I'm driving that again to save money.

dzl_damon · 12-06-2011, 08:38 PM

Torque converter. I got 18mpg when I got the truck and the converter was better. Now its slippery as heck and mpgs have dropped 3-4 mpg. 1000rpm slips on hills

12-05-2011, 04:55 AM	#3
93-12Smoke Registered User Join Date: Dec 2008 Posts: 1,279 My Photo Gallery My Classified Ads	Seems like the guys with the autos get a little worse mpgs. Would hate to see the size of that visor if it's killing mileage! __________________ 1993 250 single cab 4x4, "Big Red", Phatshaft 62 Turbo, 4" exaust, NV4500, Southbend 13'' clutch, Industrial Injection performance pump, 5x.014 sticks, Raptor 100 fuel pump w/ Donaldson prefilter, 4" skyjacker and 37" Goodyear Wranglers on 16.5 old school chrome wheels. 361hp and 787 ft lbs on 4/13/2013 1991 Toyota P/U w/ 4bt, th350, coil spring dana 70 rear and 60 front (welded) w/ 5.87 gears and 44x19.5 Boggers.

12-05-2011, 11:41 AM	#4
Douglas2 Registered User Join Date: May 2010 Posts: 531 My Photo Gallery My Classified Ads	hey-Hey!!!, I have a visor on my 1990 and see 24-25 on my back and forth to work commute( ~30 mi one way ). I have the .73 OD in the NV5600 and 3.07 axle and keep speed between 65 and 70. cheers, Douglas __________________ 1990 D250, NV5600, Luk 05-101, 16cm housing, PAC brake, TST Kit KDP tab, Powr-Lok'd 3.07, HX35...IC soon She wasn't built to travel at the speed a rumour flies 1991 D250, 16cm housing

12-05-2011, 12:21 PM	#5
wannadiesel Adminstrator-ess Join Date: Mar 2003 Location: New Holland, PA Posts: 22,593 My Photo Gallery My Classified Ads	What is the terrain like in your area? I agree that there is something up, running that slow you ought to be doing better. Where is your timing set? Sent from my HD2 using Tapatalk __________________ Faith '93 D350 - DPS 6x16's, HTT Stage IV/14wg, PowerStroke IC, Snow water/meth, Walbro 392, Con-FE, pump tampering by owner. 390 HP/800 TQ on #2 only, 413 HP/852 TQ w/ water/meth - needs more air! Dead KDP's = 72 wannadiesel@dieseltruckresource.com

12-05-2011, 01:12 PM	#6
sootnsmoke Registered User Join Date: Feb 2011 Location: Washington Posts: 606 My Photo Gallery My Classified Ads	I would think it should be better as well considering your gearing, 2wd and SRW. I get consistenly between 17.5 and 18.5 MPG with mostly highway miles over flat terrain. That MPG is with a dually, 4.10 gearing, 4x4, 5 speed manual, stock timing. Also, keep in mind that I have NO sunvisor though __________________ 1991 W250 LE Auto, KDP stock (daughters) 1992 W350 LE Club Cab 5spd Getrag 366 spring - SOLD!

12-05-2011, 09:16 PM	#9
1STGENFARMBOY Registered User Join Date: Mar 2010 Location: extreem southern ILL Posts: 853 My Photo Gallery My Classified Ads	Thats the same MPG i get driving the same distance and driving habbits, i have never got better than 18.5, that was a full tank of 60-65 on flat ground, yes it is a 4x4 auto,3.54,s and as of lately i think my converter is getting very very tired as i have seen even more of a drop of about 2 mpg, 15-16mpg and a rise of 150rpm at crusing speed (60-65) how many stop and goes? flat ground? keeping tire psi up? i'm hoping when i get on my visor mine don't drop any more. Dar __________________ 93 4x4 16cm housing, 60mm Gillett, 80hp ddp sticks, VE maxed, P/S intercooler, cooler tubes,3/16 timming, 366 gov spring, BHAF, denny T, 4in turbo back to twin 6 1/2 in stacks, holley black, home made BHFF auto, 3.54's, guages, trans tweeks

12-04-2011, 10:32 PM	#2
BILTIT Registered User Join Date: Nov 2010 Location: Lloydminster SK/AB Posts: 1,616 My Photo Gallery My Classified Ads	Probably your trans, what convertor? __________________ Derek B. 91.5 W250, getrag, DD org. valair, HE351CW, PS IC, C-tubz, Alcans, Bilsteins, GV OD, airbags, DennyT1, pump turned up.

12-05-2011, 04:04 PM	#7
user name Registered User Join Date: Feb 2008 Location: north woods of Michigan Posts: 452 My Photo Gallery My Classified Ads	The timing is stock as is the trans and convertor. I have a couple of friends that put the visors on gas trucks back when they were newer and both said they had a noticable drop in milage. I can see it your basically putting a brick wall in the only arodynamic part of they old truck. My drive to work is close to flat with one decent hill up and back down but not mountains or anything. I run 55-60 mph and turn about 1600 RPM. I would think over 20 at least in the warmer weather should be possible.

12-05-2011, 08:04 PM	#8
wannadiesel Adminstrator-ess Join Date: Mar 2003 Location: New Holland, PA Posts: 22,593 My Photo Gallery My Classified Ads	Bump the timing and see what that does. Sent from my HD2 using Tapatalk

12-06-2011, 09:58 AM	#10
apwatson50 Registered User Join Date: May 2004 Location: Golden, Colorado Posts: 2,865 My Photo Gallery My Classified Ads	maybe I will have to remove the visor from the ford. it probably only gets ~15-16. __________________ 92 Black W250 295K, getrag, valair 13" ceramic clutch, dana 80 3.54, HX40, DDP3 injectors, high pressure piston LP, custom IP, M&H M2 fuel pin, PS charge air cooler, 4 in exhaust w/ brake, gauges(and lots of them) Leece Neville power. 89 FUMMINS F350 4x4 crew cab, VE 12V, A518 trans, ford np205 t-case, PS cooler, hybrid HX35, low pressure piston LP http://s218.photobucket.com/albums/c...Truck%20stuff/

12-06-2011, 02:55 PM	#11
#2isgreen Unless it's untaxed, then it's red. Join Date: Aug 2009 Location: Damascus MD Posts: 449 My Photo Gallery My Classified Ads	I've learned never to follow what the door jamb says for tire inflation. I always read the max pressure stamped on the sidewalk and stay about 5 psi under that. Makes for a harsh ride but yields as many as 3-5 extra mpg. From experience. Your OD is working right? __________________ 93 W250 4x4 CC LE Denny T, Goerends converter, 2nd gen flex plate, pyro, boost & tach gauges, cooler tubz, 366, fuel cranked, piston lift pump, 4" straight pipe, M & H timing spacer, DNR POT kit, DNR intake, S&B filter, gloss black frame, deep/vented trans pan, KDP killed, 1 ton shoes with 1 1/8" wheel cylinders 06 TDI 5SP. BEST TANK 53.79 MPG, SBC stage 2 clutch, single mass flywheel conversion RC 1+

12-06-2011, 06:32 PM	#12
user name Registered User Join Date: Feb 2008 Location: north woods of Michigan Posts: 452 My Photo Gallery My Classified Ads	I run 80PSI all around and everything seems to work right. It also finally started snowing here so getting a good real number probably won't happen for a while again. I think it's time to bump the timing and rebuild the trans with a better trans. That or finish the 4x4 and sell this one.

12-06-2011, 06:33 PM	#13
user name Registered User Join Date: Feb 2008 Location: north woods of Michigan Posts: 452 My Photo Gallery My Classified Ads	Also I duct taped up my totaled status up and I'm driving that again to save money.

12-06-2011, 08:38 PM	#14
dzl_damon Registered User Join Date: Nov 2007 Location: Maine Posts: 1,812 My Photo Gallery My Classified Ads	Torque converter. I got 18mpg when I got the truck and the converter was better. Now its slippery as heck and mpgs have dropped 3-4 mpg. 1000rpm slips on hills __________________ -93 W350, auto, DRW, 210k. Screw lengthened, DDP 45lpm, DennyT II, 366, full gauges, Borgeson, timing 3/16", 4" unique exhaust system, dual batts, maxi fuses, PS I/C, Cooler Tubez, HE351CW, 3/8" lines/4601HP lift pump. -89 D250, auto, 83k, utility bed, very clean. 2,000hr military IP, 4" exhaust, free mods -09 Jetta TDi, Malone stage II and DSG tune -10 Kawasaki KLR650 -83 Kubota B8200

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode