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Old 02-19-2011, 05:01 PM
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Increasing fuel mileage

Would minimizing boost (shutting the turbo down) increase fule mileage once up to cruising speed? I have heard of a Banks tune that does this for the Cummins and mpg went through the roof. Any insight???
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Old 02-19-2011, 05:04 PM
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i suppose if you hooked up a smoke switch you could shut the turbo off and see what happens. i dont think it would be good for the turbo though
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Old 02-19-2011, 05:04 PM
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um that would not work. I cant tell you why but it will not work. Well one thing Shut the turbo down and you lose power. so you have to give it more fuel to make up the differance.. O and one more thing BANKS is JUNK
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Old 02-19-2011, 05:14 PM
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Banks

thats true you would probably lose mileage. plus you turbo veins would get full of carbon.
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Old 02-21-2011, 04:03 AM
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You dont need to shut the turbo down, you only need to learn to drive it so that you keep boost to a minimum. Keeping boost below 10 psi certainly seems to help with the mileage.
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Old 02-21-2011, 08:10 AM
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Ive been running the PHP tunes from Bill. On the Economy tune it spins the turbo very slowly, under 4psi all the time unless you really punch it. I noticed the sounds of the truck at idle is very different, a lot less of the hair dryer sound and when you accelerate its much deeper and less whistle.

On the highway it runs at 2 or 3 PSI boost untill a hill comes then only the boost goes up to 8 or 10. I was getting 18 steady for 700+ miles. Got over 550 miles on my tank and the low level never came on i just got nervous i wouldn't find a station at 2am.

I have more recently been running the 100Hp 200 Torque tune and it does the exact same thing. It only runs the Turbo at 1-4 psi unless you get over 2200 RPM then it lights up chits and gits.

At cruising speeds the turbo might be at 3PSI but it will spin it up and downshift really fast when the throttle is pressed.

Yes spinning the turbo Less gives better mileage when you are cruising. The faster the turbo runs the more fuel has to be fed in the engine.

Im still trying to get answers if this slower turbo PSI will causing carbonizing from PHP but i still get on her pretty often to make sure it all works.

I have been averaging 14.5 city up 2 from stock and 18 highway up 3 from stock
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Old 02-21-2011, 06:07 PM
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Banks

I love that one
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Old 02-21-2011, 08:55 PM
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I average 18 on winter fuel at 75mph with my xtreme street tune. Turbo is running ~10psi at cruising.
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Old 02-21-2011, 09:16 PM
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Originally Posted by cyclonestroker View Post
I average 18 on winter fuel at 75mph with my xtreme street tune. Turbo is running ~10psi at cruising.
Your egr delete helps
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