How much boost at driving speeds.
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How much boost at driving speeds.
Just over 1500 miles on the new 06 F350. I was driving the last few days and noticed the boost guage hovers between 3 and 10 PSI while cruising at driving speeds of 60-70 MPH. Is this normal. I know PSI goes up as I press the accelerator. The engine sounds normal, and everything seems okay. I just didn't notice this before. Thanks Levi
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normal for me. i thought it was kind of odd at first, too. ive been in to performance cars for quite some time and usually the turbo'd cars usually stay in vacuum unless you are getting in it. it was odd for me to see constant boost at cruising speeds (lol, also getting about 25-30psi under heavy acceleration).
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From: south east texas
Your boost pressure will oscillate with change in resistance (head wind, side wind, back wind, draft off other vehicle, change in road type: concrete to asphalt, and ect) These all can make your Boost vary in psi no matter if you are at the same speed same load as the last time you noticed your boost. Its quite crazy to notice the drop in boost if you tuck in behind a 18-wheeler (can be going 70mph at 10psi boost and slip right behind a 18-wheeler and the boost drop to zero)
enjoy
enjoy
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From: Lake Mary, FL
Originally Posted by levi'sford
Just over 1500 miles on the new 06 F350. I was driving the last few days and noticed the boost guage hovers between 3 and 10 PSI while cruising at driving speeds of 60-70 MPH. Is this normal. I know PSI goes up as I press the accelerator. The engine sounds normal, and everything seems okay. I just didn't notice this before. Thanks Levi
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From: Lake Mary, FL
Originally Posted by RideRed05
Your boost pressure will oscillate with change in resistance (head wind, side wind, back wind, draft off other vehicle, change in road type: concrete to asphalt, and ect) These all can make your Boost vary in psi no matter if you are at the same speed same load as the last time you noticed your boost. Its quite crazy to notice the drop in boost if you tuck in behind a 18-wheeler (can be going 70mph at 10psi boost and slip right behind a 18-wheeler and the boost drop to zero)
enjoy
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It's part of the reason these babies are so fun to powerbrake and launch in 4WD, and why turbocharging kicks major *** when it comes to towing =o)
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From: Lake Mary, FL
Originally Posted by bocomojoe
don't forget as boost goes up, mpg goes down
As boost goes up, Volumetric Efficiency goes up.
It's not the boost that causes MPG to go down.
Now, running high boost doesn't mean that your mileage will get better, because it usually means you're stepping on the throttle sharply.
If you are running high boost, you are probably driving aggressively, and a proper tune will deliver fuel with the added boost when you step on it.
However, at a given fueling rate, a given RPM and a given load, more boost often = INCREASED fuel mileage and lower EGT.
So if you're cruising at 55 at 5 PSI, and with a different tune run the same at 7 PSI, the 7 PSI will often yield better mileage.
