10-16-2012, 04:44 AM
Compression Ignition Addict
Join Date: Jul 2010
Location: Port Tobacco MD
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Originally Posted by RDUB
I posted the following in the General Discussion, but so far have not gotten much of a response so I am reposting my questions here:
I just added a Mini Max, 4" DP back straight pipe, and a S&B CAI. I ran the "Mild" tune at the Hot (250 HP) setting, and WOW! What a difference. My 21 year old son was pretty impressed as well. I have a few questions about the settings though since in a couple of weeks I will be hooking up to the 5er and heading south.
1. What tune seems to provide the best fuel milage when towing? Also what power level do you use within the tune?
No Power or Low Power watch the EGT's and keep them below 1200/1250degrees
2. Where do you set the Low Boost Fueling Adjustment? It is currently on the default setting of 2. I do get the puff of black smoke when taking off. I could move it down to 1 or 0 to get less smoke, but what is the impact on every thing else? Do you loose power, or gain milage when going to a lower Low Boost Fueling adjustment?
Low boost fueling is just that controls low boost fuel , what rpm do you run normally is it is in the range of 1500 to 1700 you are in low boost.
3. Is there a better shift schedule to use for towing the 5er? Currently it is set on schedule 1 which locks up the converter in 4th and 5th in normal driving.
MCC tuning is availabel many folks including myself are playing with it to try to achieve the best trans tune based on Torque and power demands take s some trial and error but can be done.
4. Do I still use the tow button on the truck when towing?
Tow Haul changes the shift schedule and line pressures to help control clutch slipping thus Heat build up. Heat kills Automatic slush boxes.
I love the increased power, no doubt about it. However with the upcoming trip I am most focused on getting the best mileage towing the 5er. I have 3.73 gears and loaded the 5er will be around 12,500 to 13,500 lbs.ions here.
Best Mileage..... Drive it like an ole lady. Slow on the power slow off. Try to pick a speed that the truck runs efficently at with the weight. my 450 is around 1800 to 2100 rpm for long runs.
Smooth throttle control will also help.
End of the day your truck and 5er are a streamline coke machine with all the areodymanic properties of a Hay barn. Wind, road surface and tire choice will all have an effect on your mileage. You are not going to see 12-15 mpg, maybe closer to 9-10 on long runs, much less if you have a heavy foot.
Change the trans fluid and filter this will also help some.