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post #1 of 37 (permalink) Old 09-15-2008, 05:51 PM Thread Starter
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more efficient engine?

Is there any way that you can make the engine more efficient?
there seems to be much debate over whether or not an intake or exhaust will help. What about tuning, electric fans, advancing timing....

Dan
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post #2 of 37 (permalink) Old 09-15-2008, 10:35 PM
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Re: more efficient engine?

I've been working on the MPG thing for about eight years. I've found:

1. Intake and exhaust mods do not improve MPG.
2. Electric fans replacing the engine driven fan does not improve MPG.
3. Tuning helps a little. I gained about 0.75 MPG from a one-of-a-kind custom-burned chip. All the commercially available chips improve power at the price of reduced MPG. Maybe a really, really egregious fuel hog might benefit a little more.

These engines come pretty well sorted out from the factory.

What works:
a. Numerically lower gearing.
b. Aerodynamic improvements
c. Adjusting the nut behind the wheel (the driver)

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post #3 of 37 (permalink) Old 09-30-2008, 08:49 AM
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Re: more efficient engine?

Quote:
Originally Posted by Dave Whitmer View Post
I've been working on the MPG thing for about eight years. I've found:

1. Intake and exhaust mods do not improve MPG.
2. Electric fans replacing the engine driven fan does not improve MPG.
3. Tuning helps a little. I gained about 0.75 MPG from a one-of-a-kind custom-burned chip. All the commercially available chips improve power at the price of reduced MPG. Maybe a really, really egregious fuel hog might benefit a little more.

These engines come pretty well sorted out from the factory.

What works:
a. Numerically lower gearing.
b. Aerodynamic improvements
c. Adjusting the nut behind the wheel (the driver)
i allways thought, a chiped truck would get better mileage than a non chipped.
provided you controlled yourself.
is this not so ?

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post #4 of 37 (permalink) Old 09-30-2008, 02:36 PM
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Re: more efficient engine?

When I bought my truck I was getting a consistant 14MPG.

This truck is my daily driver and getting every drop is a big deal.

I put on a better exhaust and intake, I have a TW Chip, and a rebuilt trans.

Now I am getting 18 MPG in the city. All these figures are hand calculated.

So YES they DO help. And I've seen others that have had the same result.

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post #5 of 37 (permalink) Old 09-30-2008, 04:53 PM
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Re: more efficient engine?

Mine gets better on the highway as well..especially in my 140 with the cruise set
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post #6 of 37 (permalink) Old 09-30-2008, 05:13 PM
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Re: more efficient engine?

Quote:
Originally Posted by glamis_dave View Post
i allways thought, a chiped truck would get better mileage than a non chipped.
provided you controlled yourself.
is this not so ?
I think this is more true with an automatic trans than manual.
Line pressure can be bumped up to reduce slip.
Shift points, shift duration and other parameters can be changed for the better
Timing and other engine parameter adjustments will net better economy too.

So I think those with automatic trans can see better increases with a chip verses those with an automatic.
But even Dave got .75 MPG improvement with a chip, and his manual trans and of course his driving habits tuned to max MPG.

JMHO

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post #7 of 37 (permalink) Old 09-30-2008, 05:15 PM
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Re: more efficient engine?

I so agree with Dave...

Adjustment to the nut behind the wheel is the most important change to make. On my drive in to work this morning my F350 was still above 1/2 tank and my trip meter was near 400 miles. Since making my adjustment to how I drive, this has been the normal.

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post #8 of 37 (permalink) Old 09-30-2008, 05:21 PM
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Re: more efficient engine?

Quote:
Originally Posted by 428qbird View Post
I so agree with Dave...

Adjustment to the nut behind the wheel is the most important change to make. On my drive in to work this morning my F350 was still above 1/2 tank and my trip meter was near 400 miles. Since making my adjustment to how I drive, this has been the normal.
This would imply you are getting 21+ mpg in a dually. Unfortunately that is not happening.

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post #9 of 37 (permalink) Old 09-30-2008, 06:40 PM
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Re: more efficient engine?

There has to be a balance of weight and HP/Torque. Your engine needs to have enough HP/Torque to move the vehicle without working too hard. If your engine doesn't have enough HP/Torque it will work harder and use more fuel. But on the flip side too much HP/Torque will use more fuel to do the same thing. And to clarify, I know that you really only need the Torque, the HP just helps you do it faster.

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post #10 of 37 (permalink) Old 09-30-2008, 08:42 PM
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Re: more efficient engine?

Quote:
Originally Posted by Maintain View Post
This would imply you are getting 21+ mpg in a dually. Unfortunately that is not happening.
Its possible, I got 22 out of my dually the other day on a road trip, with mods and driving properly it can be done

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