Ok Tuner companies Answer this - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 03-07-2011, 12:49 AM Thread Starter
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Ok Tuner companies Answer this

I have spoke to a couple of guys, 1 has a 6.4 ford, another has a 5.9 dodge. These guys have done extensive tuning and exhaust work to their trucks and both claim to get ungodly fuel milage compared to my 2011 6.7

I mostly use my truck to transport trailers around the country, The guys i spoke to said they get 17+ mpg pulling big trailers, 5th wheels and such. And empty they are getting like 23+ mpg at 65-70.

I currently get like 10mpg with big 5th wheels. I would gladly invest the money for all of the DPF DEF EGR tuning kits if i could gain a substantial increase in my fuel milage.

Im just worried that these guys are exaggerating a bit.

If anyone can confirm such MPG increases please let me know.
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post #2 of 21 (permalink) Old 03-07-2011, 01:14 AM
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Ya they are definantly exaggerating. Between me and my buddies we have every Ford or dodge pulling trailers with every combination of tunes and your lucky to get 13 pulling a big trailer with any anything. Some throw the over head off to show those numbers. 23 is easy to see with an empty 6.4 tuned especially a 5.9! You cannot even compare a new truck to a 5.9 though.


The rcd 585 up'd my 6.4 huge though
Went from 16.4 on perfect conditions to low 20's empty.

And from 6-8 up to 12-13 with trailer
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post #3 of 21 (permalink) Old 03-07-2011, 04:46 AM
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You wont be getting any feedback from a tuner company about the correlation between fuel mileage and the deletes, since technically they are illegal for on-road use. Check other forums, and other threads on this website, there is plenty of info.
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post #4 of 21 (permalink) Old 03-08-2011, 04:03 PM
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I have a 6.4 spartan tuned and pulling my 40' 5th wheel I get 9-10 nothing better. Their #'s sound a bit high. Even my small gooseneck stock trailer 24' the best I have seen has been 12 more 10-11 on average.
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post #5 of 21 (permalink) Old 03-12-2011, 03:07 AM
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Quote:
Originally Posted by Hatya View Post
I have spoke to a couple of guys, 1 has a 6.4 ford, another has a 5.9 dodge. These guys have done extensive tuning and exhaust work to their trucks and both claim to get ungodly fuel milage compared to my 2011 6.7

I mostly use my truck to transport trailers around the country, The guys i spoke to said they get 17+ mpg pulling big trailers, 5th wheels and such. And empty they are getting like 23+ mpg at 65-70.

I currently get like 10mpg with big 5th wheels. I would gladly invest the money for all of the DPF DEF EGR tuning kits if i could gain a substantial increase in my fuel milage.

Im just worried that these guys are exaggerating a bit.

If anyone can confirm such MPG increases please let me know.
THIS IS EXACTLY WHY I WANT A TUNER AND EMISSIONS DELETES!
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post #6 of 21 (permalink) Old 03-12-2011, 11:58 PM
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The devil is in the details.

What does the torque curve look like post tuning?

How are the mileage claims verified?

What sort of controlled tests are being run?

If you honestly think there is 25% gain in fuel economy from just electronics tweaking... I got a bridge to sell you.

Modern engines just do not have that much slack without major changes.
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post #7 of 21 (permalink) Old 03-13-2011, 12:29 AM
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my cummins has put down a best of 14.5 mpg pulling my regular load of a 26ft enclosed stock trailer with a load of cows those were pretty ideal conditions

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post #8 of 21 (permalink) Old 03-13-2011, 03:58 PM
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I get 12-13 with mine pulling 10,500 toyhauler. That can drop to 10-11 in the mointains.

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post #9 of 21 (permalink) Old 03-14-2011, 02:00 PM
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There are a LOT of people who correctly and honestly report MPG numbers, the problem is two-fold:

1) You don't "know" who those are, for sure.
2) Most people don't calculate it correctly.

MPG is simple, miles actually driven divided by gallons used. Bigger tires, different gears, tire inflation, wind etc ALL play a role in the real-world accuracy of any calculation. Ford's "Lie-o-Meter" is off by as much a 2 MPG on a stock vehicle, maybe more on aftermarket tires. Almost always to the plus side too!

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post #10 of 21 (permalink) Old 03-14-2011, 02:55 PM
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Tuning for additional power is not that hard.

It involves injection of and combustion of additional fuel to generate more energy.

However, tuning for fuel economy, is nearly a totally different job, as it involves reduction of output that is "unnecessary" to keep a vehicle moving at speed.

It often involves sharp compromises in drivability (e.g. the systems that turn off cylinders and sharply retard power output. No tuner I know of is using Cylinder deactivation, but it can be done --- or a form of it simply by sharply varying injection output at the "dead" cylinders.

Or, things like cutting power and torque output to ensure that whatever fuel that is extracted burn.

Now, if you slashed RPM max to 1,500 or below, a sizable efficiency gain is possible from lower pumping losses vs. power output --- at the expense of performance.

The bottom line is, software controlled options are pretty limited --- thermal efficiency is pretty much regulated by the basic engine design.

If you want to start talking hardware changes, there is a bit more wiggle.

But not 25%
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