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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Boost Pressure at 65mph

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Old May 28, 2009 | 01:01 AM
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2500HeavyDuty's Avatar
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Default Boost Pressure at 65mph
what kind of boost pressure are you guys seeing at 65-70 mph.

i get like 1 or 2 psi and that does not seem normal to me at all.
 
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Old May 28, 2009 | 01:08 AM
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even know i have a cummins and a bigger turbo im at 12psi at 70 in 5th even with the stock turbo i was at 8 or 9 dont know why a duramax would be any different
 
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Old May 28, 2009 | 01:11 AM
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yeah im a cummins man also and i see about 10-15 psi in 5th gear
my dads d max does the same low or no boost at highway speeds
 
Last edited by coyropin; May 28, 2009 at 01:13 AM. Reason: forgot to add the dad part
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Old May 28, 2009 | 01:12 AM
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i know it also depends weather your on flat land or a slight grade but 1 or 2 cant be corect
 
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Old May 28, 2009 | 07:25 AM
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it all depends on the load on the motor.....I see as low as 3 lbs on flat ground doing 65-75 mph
 
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Old May 28, 2009 | 07:34 AM
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Originally Posted by Whitmore
it all depends on the load on the motor.....I see as low as 3 lbs on flat ground doing 65-75 mph
Same here on flat ground just cruising no load no wind I see very little boost at 70. Slight grade will give some boost and a good hill I might see 10lbs.
 
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Old May 28, 2009 | 07:48 AM
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i see low boost with no load on flat ground. on a hill with 5th wheel i might see 30. it depends on load on motor
 
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Old May 28, 2009 | 10:44 AM
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even goin up a slight grade in the city itl go up to 2psi, but when its on flat land itl be at 1psi.

noticed im getting chit mileage too this tank
 
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Old May 28, 2009 | 11:47 AM
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Think your turbo's going out? Could it be a waste gate issue or something?
How does your turbo respond otherwise?
 
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Old May 28, 2009 | 01:54 PM
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im thinkin theres a leak somewhere, but can some one with a lb7 tell me what kind of boost they make at 65 mph cruising

am i like the only dmax with gauges out here
 
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