Fuel mileage results after 5 speed swap!
#3057218
07/07/22 05:05 PM
07/07/22 05:05 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Man I am stoked. After 3 years of collecting parts, probably $2000 and a month and a half of work I can finally say my truck went from an abysmal 7.3 MPG to an equally abysmal 7.45 MPG!
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: Guitar Jones]
#3057221
07/07/22 05:13 PM
07/07/22 05:13 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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Man I am stoked. After 3 years of collecting parts, probably $2000 and a month and a half of work I can finally say my truck went from an abysmal 7.3 MPG to an equally abysmal 7.45 MPG! I have to admit surprise. The lockup torque converter was supposed to be good for 3%. The A727 was supposed to suck up ~ 45 hp. You used the NV4500?
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Fuel mileage results after 5 speed swap!
[Re: 3hundred]
#3057223
07/07/22 05:23 PM
07/07/22 05:23 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Yeah an NV4500 to replace the about ready to grenade NP435. In all honesty I didn't do the swap for fuel mileage, it was my original intention when I started gathering parts for it because I drove a lot of highway miles in FL. Here, maybe 70 highway miles a month, so I knew it wasn't going to be a drastic change. The truck spends most of it's time around here under 30 MPH. The upside is I can actually drive it at 70 now, my ears don't ring for two weeks after I drive it and I now have A/C. So that figure is with A/C on that the truck never had before.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: topside]
#3057248
07/07/22 06:49 PM
07/07/22 06:49 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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It's a solid fuel saver now, why own a hybrid?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: 360view]
#3057344
07/08/22 07:17 AM
07/08/22 07:17 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Does that Magnum V8 now have a barb instead of the fuel injection? It's still an LA with Magnum heads and front drive assembly so yeah, it has a Holley style 650 vacuum secondary carb.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: HotRodDave]
#3057467
07/08/22 06:30 PM
07/08/22 06:30 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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4.10s with a 31" tall tire. It has on paper a 8.9:1 compression ratio and a small 220/220 @ .050 cam with .478 lift and a 108 LSA. Heads are bone stock Magnums and the engine is .040 over. Edelbrock Performer RPM air gap intake and a 1" carb spacer. It has light spark knock under moderate load on 87 pump swill. I've knocked the timing back to 28° total at 2700. I don't want to go any farther.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: nuthinbutmopar]
#3058428
07/11/22 10:39 PM
07/11/22 10:39 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Sounds like my dad's '72 Travelall 4x4 with the 345. it got 7 mpg. City driving; 65 mph highway driving; pulling a '69 Chrysler 300 demolition derby car on a tandem-dual trailer for 200 miles at WOT: 7 mpg...
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: Guitar Jones]
#3058463
07/11/22 11:52 PM
07/11/22 11:52 PM
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Joined: Jan 2003
Posts: 20,767 A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,767
A collage of whims
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It's weird how that works: way back I had an '85 Chevy C20, carbureted 454/400, got about 7 MPG no matter what speed or load. The '89 GMC Dually I've had for a long time, FI 454/400/GV, gets 10-11 MPG whether it's loaded up & towing, or empty. (Pre-GV, it got 7-8 MPG.) Before oxygenated & ethanol gas, I once threw everything I could think of at it, and on a steady freeway Cruise, just made 12 empty. Good thing is it doesn't care about octane, thank God.
Jones, I'd be curious what your rig would get with more timing and octane.
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Re: Fuel mileage results after 5 speed swap!
[Re: topside]
#3058483
07/12/22 05:55 AM
07/12/22 05:55 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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I might experiment with it a little later on. Right now I'm just concentrating on the small finishing details. The truck lost the WWII Jeep vibe it had going on. It's like driving a new truck now, quiet, nice audio system, power windows at all 4 corners, intermittent wipers, A/C of course and more.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Fuel mileage results after 5 speed swap!
[Re: Guitar Jones]
#3058488
07/12/22 07:01 AM
07/12/22 07:01 AM
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Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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4.10s with a 31" tall tire. It has on paper a 8.9:1 compression ratio and a small 220/220 @ .050 cam with .478 lift and a 108 LSA. Heads are bone stock Magnums and the engine is .040 over. Edelbrock Performer RPM air gap intake and a 1" carb spacer. It has light spark knock under moderate load on 87 pump swill. I've knocked the timing back to 28° total at 2700. I don't want to go any farther. with that gearing and aerodynamics that MPG is not out of line, especially if parts of trips are off road and on hilly country roads sometime in the future use an oxygen sensor to find out your “ballpark” air to fuel ratio at level highway cruise
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Re: Fuel mileage results after 5 speed swap!
[Re: 360view]
#3058568
07/12/22 01:18 PM
07/12/22 01:18 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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4.10s with a 31" tall tire. It has on paper a 8.9:1 compression ratio and a small 220/220 @ .050 cam with .478 lift and a 108 LSA. Heads are bone stock Magnums and the engine is .040 over. Edelbrock Performer RPM air gap intake and a 1" carb spacer. It has light spark knock under moderate load on 87 pump swill. I've knocked the timing back to 28° total at 2700. I don't want to go any farther. with that gearing and aerodynamics that MPG is not out of line, especially if parts of trips are off road and on hilly country roads sometime in the future use an oxygen sensor to find out your “ballpark” air to fuel ratio at level highway cruise That timing curve is waaaay too conservative for that motor. It should not be anywhere near spark knock, maybe you have a fuel line too close to exhaust somewhere or insufficient air flow under hood or something. That engine should easily take 32-35 degrees mechanical timing and that would help MPG quite a bit. I would try bumping the timing to 35 and run premium through it a couple tanks to see if it is worthwhile to run premium by getting much better MPG. I had a nearly identical cam in a magnum 410 iron magnum headed stroker motor with 11 to1 compression and it would run 32 degrees timing on premium with no knocking.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Fuel mileage results after 5 speed swap!
[Re: HotRodDave]
#3058586
07/12/22 02:25 PM
07/12/22 02:25 PM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
OP
Paddle faster! I hear banjo music!
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OP
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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I had it at 33° before the swap but the howling coming out of the trans was so loud I never heard any spark knock. It is really light. I'll experiment with it after I get the little things taken care of. I'm waiting on a couple 10" 1000 cfm fans I'm going to put on the condenser and a trailer brake controller. I think I got the fuel gauge working decently now. I may even put a slightly colder plug in it.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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