Proper Boost Levels
Mountain Pass
Joined: Oct 2010
Posts: 237
Likes: 3
From: Athens, Tx
Mike... Do you have any gauges or something that reads live data? Also glad that the truck is running better however I would think that if everything was working properly 15-18psi would feel like poop compared to 26psi. Have you taken it out to see what your "absolute" max boost is? To go back to pipe connections I know you have had turbo off recently due to EGR delete and cleaning and I just want you to know how important it is that you have "No" gap whatsoever between the y-pipe and turbo mating flanges. The v-band clamps will not close the gap, and this obviously will affect your boost building abilities. You would also be able to hear hissing depending on how much of a gap there is. None of this may help you or pertain to your circumstances however wanted to throw it out there.
Matt
Matt
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Junior User
Joined: Oct 2014
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Mike... Do you have any gauges or something that reads live data? Also glad that the truck is running better however I would think that if everything was working properly 15-18psi would feel like poop compared to 26psi. Have you taken it out to see what your "absolute" max boost is? To go back to pipe connections I know you have had turbo off recently due to EGR delete and cleaning and I just want you to know how important it is that you have "No" gap whatsoever between the y-pipe and turbo mating flanges. The v-band clamps will not close the gap, and this obviously will affect your boost building abilities. You would also be able to hear hissing depending on how much of a gap there is. None of this may help you or pertain to your circumstances however wanted to throw it out there.
Matt
Matt
I did check EBP, and at idle i sit just under 16psi.... if there was a leak between turbo and exhaust manifold, wouldn't that be low?
Thanks
Mike
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Joined: Oct 2014
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I dont know i will log it on the way home with torque
Also is your MAP, EBP and BARO within .5 of each other at KOEO? I know Josh asked earlier but didnt see a response to it.
EBP: 13.9
MAP: 14.0
Baro: 13.9
That is Key On Engine Off
When i started it and at idle
EBP: 17.8 <-- Is that to high for idle?
MAP: 14.0
Baro: 13.9
Thanks
Mike
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Josh
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I was a cold start i did not check the VGT but it would not have surprised me if it was 80%+ or so. Check when i get in to go home.
New User
Joined: Nov 2014
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From: Capac
if im on the throttle hard my monitor says around 23-26 psi unloaded. it does say though that I have hit 33.1 psi before though. not sure if that was just a fluke though. cruising down the highway at 75mph I average about 11 psi
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Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
Normally, if all is well, boost under moderate or hard acceleration for a period of seconds wont go over about 20 psi unless it starts hitting 3rd and 4th gear and you keep your foot down, once it does though you should see this 26 - 28 psi no trouble. If you are getting lag, or puffs of black smoke, I would look into the EGR valve, and look at cleaning MAP tube, EBP and Tube, MAF and IAT2 sensors with MAF cleaner spray. Your EBP sounds high and you probably now need to do a cleaning of the EGR as well and then run EGR relearn if you have one. If you dont, and its not deleted with a programmer, you could be running in limp mode which is restricting boost as well....
Elder User
Joined: Jan 2007
Posts: 759
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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
Senior User
Joined: Oct 2014
Posts: 194
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From: S Florida
Normally, if all is well, boost under moderate or hard acceleration for a period of seconds wont go over about 20 psi unless it starts hitting 3rd and 4th gear and you keep your foot down, once it does though you should see this 26 - 28 psi no trouble. If you are getting lag, or puffs of black smoke, I would look into the EGR valve, and look at cleaning MAP tube, EBP and Tube, MAF and IAT2 sensors with MAF cleaner spray. Your EBP sounds high and you probably now need to do a cleaning of the EGR as well and then run EGR relearn if you have one. If you dont, and its not deleted with a programmer, you could be running in limp mode which is restricting boost as well....
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Yes, relearn is unconnected both batteries with the headlights on, leave like that for 10 minutes, then connect batteries, then, turn key to on, hold 15 seconds, back to off for 20 seconds, three times, then to on, then start, let idle twenty minutes, then complete drive cycle. The relearn will make a difference, but best to clean EGR amd the above sensors before starting. If you don't wait long enough before the on cycles, the relearn will not happen. It took me a few times and some patience, but once it relearns and completes the drive cupylindercylinder, you should check for codes.....
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johnny8
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Aug 28, 2005 12:21 AM