Proper Boost Levels
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Junior User
Joined: Oct 2014
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Proper Boost Levels
Hi,
Just bought a 6.0 and replaced the EGR cooler. After getting it back together and driving it around a bit (2 months) i have a feeling that i am getting low boost number. No load, leaving a signal i get almost spot on 10psi, does not matter how hard i push in the gas peddle. Going up a hill (no load) i might get to 12psi but that is about it. Now i have read that you should not go ber 30psi and when towing a 5th wheel should be 20-25psi but what are the no load boost values?
Also dont know if it is related, but when i turn the truck off after driving home, for about 10 seconds or so it should like there is a sucking noise.... normal, not normal? ( i am going to try and get video of it but might be hard)
Thanks
Mike
Just bought a 6.0 and replaced the EGR cooler. After getting it back together and driving it around a bit (2 months) i have a feeling that i am getting low boost number. No load, leaving a signal i get almost spot on 10psi, does not matter how hard i push in the gas peddle. Going up a hill (no load) i might get to 12psi but that is about it. Now i have read that you should not go ber 30psi and when towing a 5th wheel should be 20-25psi but what are the no load boost values?
Also dont know if it is related, but when i turn the truck off after driving home, for about 10 seconds or so it should like there is a sucking noise.... normal, not normal? ( i am going to try and get video of it but might be hard)
Thanks
Mike
Laughing Gas
Joined: Oct 2013
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I think I know what you mean on the sucking noise - mine does that too, and I don't worry about it. I don't know what it is, but maybe it's the vacuum system leaking (my front auto hubs don't work because of this) or it could be a/c system normal noises. Turn your climate control off a minute before shutdown to rule that one out.
Postmaster
Joined: Sep 2010
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From: Southern Cal
My 2007 will spool up to 26 lbs when hard on the throttle empty. Driving around town with a soft peddle, 10-15lbs.
When pulling our 5th wheel, it too will boost up to 26 lbs max.
Never goes beyond that after the unison ring was fixed and moves properly.
When pulling our 5th wheel, it too will boost up to 26 lbs max.
Never goes beyond that after the unison ring was fixed and moves properly.
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I think the unison ring is my issue, going to check all the pipe connections but i think the unison ring is sticking/jammed
Postmaster
Joined: Sep 2010
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From: Southern Cal
Your unison ring can stick to create both an under boost or over boost condition.
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2005-2007 isn't going to boost much past 26 psi. The 03/04 could hit 30 psi.
Sounds like the vanes are stuck in the closed state, allowing quicker spool, but less total boost.
Also verify EBP, MAP and Baro KOEO and also VGT% commanded at idle. And also EBP Psi at idle should be 16 psi or less. Warm idle and over 16 psi shows closed vanes.
Josh
Sounds like the vanes are stuck in the closed state, allowing quicker spool, but less total boost.
Also verify EBP, MAP and Baro KOEO and also VGT% commanded at idle. And also EBP Psi at idle should be 16 psi or less. Warm idle and over 16 psi shows closed vanes.
Josh
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Floor it! Putting the pedal to the floor should break the vanes loose. when they break loose, the truck will take off like a rocketship. If this happens then its just a dirty turbo. no biggie. But if its really bad sometimes flooring it wont work and youll need to monitor and compare vgt duty cycle and boost
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Junior User
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I can check EBP tomorrow.
Thanks
Mike
Postmaster
Joined: Sep 2010
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From: Southern Cal
Floor it! Putting the pedal to the floor should break the vanes loose. when they break loose, the truck will take off like a rocketship. If this happens then its just a dirty turbo. no biggie. But if its really bad sometimes flooring it wont work and youll need to monitor and compare vgt duty cycle and boost
Mine had to be pried off the turbo before moving. Once cleaned and replaced, it actually reacted less with throttle then before, knowing it wasn't creating too much psi or over boost.
Postmaster
Joined: Sep 2010
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From: Southern Cal
So i monitored VGT on the way home. when i went out and started it up it went straight to 85% and stayed there. when i pulled out onto the street it would drop to 50% or so. when i would stop and a signal, it would be around 65-70%? The lowest i saw it was 46%. not sure what it should be but.... i think that is not normal?
I can check EBP tomorrow.
Thanks
Mike
I can check EBP tomorrow.
Thanks
Mike
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Thanks guys, as always you guys were right.... I took apart the turbo and the unison ring was... well lets just say it took alot of prying and cussing to get the thing off. But cleaned it up, put the turbo back together and it is a completely different truck.
P.S. for the most part i am still only pulling to about 10psi, unloaded and flat ground but if i floor it i do get higher 15-18psi. Also the truck just runs better.
Thanks Guys
Mike
P.S. for the most part i am still only pulling to about 10psi, unloaded and flat ground but if i floor it i do get higher 15-18psi. Also the truck just runs better.
Thanks Guys
Mike