normal boost pressure
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Junior User
Joined: Apr 2009
Posts: 79
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From: Santa Fe Springs, Califor
normal boost pressure
i have a 6.9 diesel with an Allison AT545 4 speed auto, and i put a Banks Sidewinder turbo on it, my question is that i dnt get no turbo boost until i floor it, but when im just crusing at 45-55 mph, the boost gauge always reads 0, when i floor it it jumps to 7-8 psi, is that how it supose to work??? only when i floor it??
Lead Driver
Joined: Dec 2002
Posts: 5,490
Likes: 13
From: Kuna ID
Pretty much, boost is really only generated under a load. Having an intercooler probably makes that even more noticable since it will lower your boost pressure.
How do you get away with a hood stack in california?
How do you get away with a hood stack in california?
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
It will usually have a little just cruising it depends on how much power your using and how much fuel you are giveing it, most claim 3 or 4 on flat ground running fairly empty, this will vary with things like wind or any thing that takes more power to maintain speed.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
Dayum I just looked at his gear setup,I agree 100% with you. I don't know what my IDI runs empty, I'm thinking not much (no guage) but was going by what others have posted. All my big trucks runs very little at cruising speed light throttle.
Cargo Master
Joined: Nov 2003
Posts: 2,585
Likes: 1
From: Duluth, Mn.
Sounds like a boost leak to Me. The common culprits are the intake hat hold down bolt and the intake hat/intake seal.
You should see a coupla lbs at cruise. My Sidewinder shows 5 psi @ 1400 RPM cruise.
You should see a coupla lbs at cruise. My Sidewinder shows 5 psi @ 1400 RPM cruise.
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