After extensive reading and learning experiences I tried to make a good mileage tune. (I know I know a light foot helps too :D) Things I read and tried;

1) Open vane position to decrease drive pressure
2) Increase desired boost
3) Advance timing
4) Disable EGR valve



I also set in my own makeshift exhaust brake at 0% throttle to close the turbo vanes.



Please take a look and tell me if I'm on the right track and if not let me know where I went wrong and/or how I can improve it!

Thanks everybody!!
-Kyle

What are your results with it? Anything hand calc'd before and after?

didnt look at the tune, but if its a fuel mileage tune, why would you want to take away one of the most fuel efficeint times of coasting, by trying to slow the truck down?

Nothing figured yet, I'll be topping off my tank day after tomorrow and start the calculating from there.


didnt look at the tune, but if its a fuel mileage tune, why would you want to take away one of the most fuel efficeint times of coasting, by trying to slow the truck down?

If you're referring to the "exhaust brake" I do about 40 miles of highway commute a day and 5 miles total on and off the highway on local streets to get to the firehouse. So most of the time the cruise control is set on the highway and there is no "braking" needed. On my days off I haul a landscaping trailer with a bobcat excavator or some sort of similar equipment for a landscaper friend of mine, so I figured that it couldn't hurt to use it. Do you think it could hurt the mileage that significantly?


-Kyle

Having never tuned anything exept for my guitar lol I have a question. I opened the tune using the EFI software. I see the turbo vane tp has been changed at 0 fuel for all altitudes. Does it not matter that the vane position wasn't changed in the ECT and IAT windows? Again I haven't tuned anything just trying to learn.

Engine Coolant Temp and Intake Air Temp tables are tables that use their corresponding multipliers to decide how much of each value (vane position, boost, timing, whatever) to add to whatever table the ECM is currently using depending on ECT or IAT and the multipliers.

-Kyle

what is your boost at with cruise control set?

Engine Coolant Temp and Intake Air Temp tables are tables that use their corresponding multipliers to decide how much of each value (vane position, boost, timing, whatever) to add to whatever table the ECM is currently using depending on ECT or IAT and the multipliers.


Thanks! I actually understand that. There's hope for me yet:rolleyes:

Have you logged it yet?

I made a couple changes last night.... I wasn't making enough boost out of the hole so I closed the vanes from 1000 - 1500 rpm to about stock levels. to get it to spool up a bit quicker, but left the higher ranges more open.

what is your boost at with cruise control set?


Cruise control set at 70mph about 1900rpm making between 10 and 12 psi.



-Kyle

Have you logged it yet?



I have not logged it yet. When I do what should I be looking for?

-Kyle

If you want mileage, your boost has to come down at 70mph. Mine runs just above 0 psi (yep, zero) cruising empty at 70 mph. I can average about 20-21 mpg running 70-75 mph, too (on summer fuel).

I made a couple changes last night.... I wasn't making enough boost out of the hole so I closed the vanes from 1000 - 1500 rpm to about stock levels. to get it to spool up a bit quicker, but left the higher ranges more open.




Cruise control set at 70mph about 1900rpm making between 10 and 12 psi.



-Kyle

IMO i would lower the cruising boost this will help with mileage;)

If you want mileage, your boost has to come down at 70mph. Mine runs just above 0 psi (yep, zero) cruising empty at 70 mph. I can average about 20-21 mpg running 70-75 mph, too (on summer fuel).


x2

IMO i would lower the cruising boost this will help with mileage;)

X3

I ran a new so-called mileage tune to Myrtle Beach for half a tank and realized it was running at 10 lbs at 75-80. I flipped on the race tune and did much better (it cruised at 0 until you hammered it).

I'll try it this afternoon, thanks for the tips, keep em coming I'm learning a ton by trial and error right now.

-Kyle

yes, increasing boost increases fuel consumption. your increasing the backpressure on the engine which requires more fuel.