Upgrade combo for best fuel milage

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11-30-2005, 09:20 AM

#16

tmacie

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MnTom,
Thanks for the input, I understand differnet things for different trucks. I guess I'm looking for "Heres what happened to me when I did this"

Thanks,
Travis

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11-30-2005, 04:59 PM

#17

cumminsdriver635

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Quote:

Originally Posted by WideOpenThrottl

cumminsdriver635, how will the auto benifit for better milage on the interstate?? does it have a higher top gear ratio than the 5spd.?
I was always under the notion that a manual driven nicely will always net better milage do to the fact that there is less power loss through the drivetrain.
tim.

I believe a manual would win stock truck vs stock truck in town. The reason i say the auto would be better for the interstate is that 4th gear in the auto's is pretty high. I can run about 75mph at 2k rpm's if i remember correctly. The overdrive ratio in the auto is 0.69:1 so it is pretty high. My truck was built for the interstate with 3:54's, and the auto

In town with an auto with a good aftermarket EFFICIENT torque converter should be the same as a manual. Maybe better?? You dont lose boost on shifts, and you can freewheel more, but i dont know if that would help or hurt. Id say overall they would be pretty even in town, with the auto having a slight edge on the highway, but that is just my guess.

Eric

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11-30-2005, 07:15 PM

#18

MnTom

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Quote:

Originally Posted by tmacie

MnTom,
Thanks for the input, I understand differnet things for different trucks. I guess I'm looking for "Heres what happened to me when I did this"

Thanks,
Travis

I think I understand the question now. When I adjusted my valves my fuel mileage went up about 2-3 mpg and the idle is a lot smoother. I also moved the plate back to about 3/4 forward and moved the AFC to about 3/4 forward at the same time. Now I have virtually no smoke except at WOT and still mannaged to put 299 hp to the ground.
Tom

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11-30-2005, 08:16 PM

#19

WideOpenThrottl

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Quote:

Originally Posted by cumminsdriver635

That would make sense, mine has 3.54's and 285 tires and at 75mph it runs at about 2100-2150rpms i believe. The auto does have a bit taller gear, .69:1, where the nv4500 is .73:1,
Thanks for the info, tim.

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12-01-2005, 08:03 AM

#20

tmacie

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MnTom, this is PERFECT!!!!! Exactly what I'm Looking for. It looks like you made mods, slid the plate full forward, noticed power but a drop in milage so you moved it back an got some milage back, correct? What are you getting for milage?

Travis

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12-01-2005, 08:18 AM

#21

MnTom

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Well, You need to remember that this all took place about the same time fuel hit $3/gal. I went from about 16 mpg to about 19 mpg. I also have gone a little lighter on the throttle too, however, I still get going faster than when I am in my Jeep w/4.0 or Caravan w/3.3. Pulling two trailers with a CGVW of 17k+ I still manage to get 12 to 14 mpg. The best thing is taking off from a stoplight and out pulling most of the traffic without even trying! The look on some of their faces is great.
Tom

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