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Old Aug 7, 2007 | 08:06 PM
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low boost pressure

I just put guages on my truck last week and it seems like the boost pressure is low. I can only get abbout 11lb @3000rpm. I check the line for leaks and tightened all connections. Why cant I get the 18+lb that most of you are getting
 
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Old Aug 8, 2007 | 08:51 AM
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could it just be my guage or is there something wrong with my turbo?
 
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Old Aug 8, 2007 | 10:02 AM
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I have the 18k mod and i hit 27lbs of boost. Check for Exhaust leaks on your up pipes.
 
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Old Aug 8, 2007 | 10:19 AM
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where did you tap into. I have myne just before the map sensor. Should I have it some where eltse?
 
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Old Aug 8, 2007 | 10:21 AM
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Thats where mine is to. check the line going to your gauge to see if it has a kink in it.
 
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Old Aug 8, 2007 | 10:21 AM
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if you are just cruising you wont see much more than 11lbs. Really the only time you will see your boost spike is taking off hard and really spooling the turbo up. also, you dont want those higher boost pressures as the stock turbo can only handle so much. next time you at a redlight take off hard and really get into it. i betcha you will hit 25-28 lbs pretty easy!

-cutts-
 
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Old Aug 8, 2007 | 10:52 AM
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11 is all I get when i really lay into it. Cruising i only push about 1-2.
 
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Old Aug 8, 2007 | 10:54 AM
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Running 65 to 70mph i see 3 to 5lbs of boost.
 
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Old Aug 8, 2007 | 10:57 AM
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when I lay into it and the boost goes from about 5-10 the needle flutters a lot is it supposed to do this or is something wrong?
 
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Old Aug 8, 2007 | 11:09 AM
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My gauge stays as steady as a rock. I think you have a leak some wear, or a pinched boost line going to your gauge.
 
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Old Aug 8, 2007 | 11:51 AM
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Originally Posted by fishmanndotcom
if you are just cruising you wont see much more than 11lbs. Really the only time you will see your boost spike is taking off hard and really spooling the turbo up. also, you dont want those higher boost pressures as the stock turbo can only handle so much. next time you at a redlight take off hard and really get into it. i betcha you will hit 25-28 lbs pretty easy!

-cutts-
Wouldn't you see the most boost pulling a long grade where the revs can sit high? Taking off my truck doesn't have long at the higher revs before it shifts. Climbing a grade at 70 in 3rd or 50 in 2nd seems to make the turbo whine the most. (Nope, never measured boost).
 
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Old Aug 8, 2007 | 11:53 AM
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check you air filter
 
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Old Aug 9, 2007 | 07:52 PM
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my neighbor has a 97' 350 and his turbo just went bad. He said he was running low boost and it lack of power. I have never run another powerstoke to compare mine to but his truck pulls hills sprinting where mine would be at a walk/jog. Could this be my problem or should I look at other things first
 
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Old Aug 9, 2007 | 07:56 PM
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ono55 27psi!on just an 18k icp? good lord thats alot
 
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Old Aug 9, 2007 | 08:41 PM
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Originally Posted by joe_13894
Wouldn't you see the most boost pulling a long grade where the revs can sit high? Taking off my truck doesn't have long at the higher revs before it shifts. Climbing a grade at 70 in 3rd or 50 in 2nd seems to make the turbo whine the most. (Nope, never measured boost).
not necessarily b/c when cruising down the road the engine is not demanding more air than fuel so the turbo isnt trying to force air in. however in a quick takeoff situation you are forcing more air in than fuel and that causes a backup of air.... boost pressure builds in the compressor housing. the boost pressures drops when the compressor catches back up with the demand.

thats why you see very little if any boost (on stock trucks) cruising down the interstate... b/c the demand is equal to or close to equal to the amount of air the turbo is pushing

hope that makes sense

-cutts-
 
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