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Discussion Starter #1
Can someone tell me what is the max boost pressure from the factory? I see about 31-32 psi, is this acceptable for a completely stock 6.4?
 

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Discussion Starter #2
Anyone? I have looked with no success
 

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I think I used to see mid to high 30's on WOT back when my truck was stock, but that was a while ago. Are you worried about your numbers being too low or too high?
 

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Discussion Starter #4
I am worried its too low. Its tops at 31-32. Is that normal? The thing is I am about to get h&s and delete but if something is wrong I need to address it first.
 

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31-32 is a little low. Before my DOC/DPF fell off I would see 38-39.
 

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Discussion Starter #6
So what could be causing this? How do I fix it?
 

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Discussion Starter #7
Do all 6.4s run @ 38-39 or does it vary?
 

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I can not speak for all 6.4, only my experience and what i have read on the various forms. Might want to go for the simple fix by checking the the bands on the cold air boots. After that take it to the dealer. Could be the gage, TCM needs to be re-flashed, and a bunch more. Sorry could not add much more.
 

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Discussion Starter #9
Thank you guys. Ill call the dealer and see what's up.
 

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i have h&s programmer and still only see 32-35... i was starting to wonder the same thing. i hate to put dpf back on and take to dealer if im actually getting more. i have xrt pro so i dont have guages.
 

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Discussion Starter #11
I actually am starting to believe my dpf is the cause. Im sure its pretty clogged it has 125k miles on it and regens between every 50-100 miles. Today I was pulling my horse trailer up a hill on the hwy and the boost spiked to 35ish for a brief moment. So im thinking maybe nothing is wrong with the engine or turbid.
 

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ford recommends to change the dpf after 110-120k miles so it may be the problem, it will be 3 times cheaper to do a tuner, exhaust, and intake then to buy a new dpf.
 

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Discussion Starter #13
That's what im thinking. It makes sense if the exhaust can't flow enough then its not going to spool the turbo. Thanks everyone. So yes I need a tuner... if anyone wants a nice brush guard its in the FS section. Thanks.
 

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I have compleately pegged my boost but that was towing. Just driving around it generaly stays mid 30's.
 

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Discussion Starter #15
How many miles do you guys have that are seeing "normal" boost levels?
 

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Remember..... boost is a measure of restriction in the intake manifold. In theory if you have a more free flowing exhaust your boost may be lower but the power greater

I see 6.4s all the time that don't seem to want to make more than 31-32psi unloaded. To really spool those turbos you may need to be hauling a nice sized load
 

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Discussion Starter #17
Thanks sinner!
 

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When i was on the dyno the highest boost i saw was 37. It made plenty of power tho
 

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Get rid of the DPF, It sounds like your truck cant breath at all. My stock boost was the same as yours 32-34psi unloaded.
 

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Discussion Starter #20
I am going to. I was thinking the same thing. Thanks to all!
 
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