Duramax Diesels Forum Truck of the Week
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Old 06-02-2018, 06:13 PM
dcpjfs432 dcpjfs432 is offline
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Default Lb7 turbo question

Okay so I have a 04 lb7 as far as I know it is stock other than a k&n cold air intake. But it is pushing 37psi of boost which I thought was high for stock so my question is what should it be and how do I go about diagnosing this issue? Thanks in advance


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Old 06-02-2018, 06:32 PM
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rfletes79 rfletes79 is offline
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How do you know it’s 37psi?
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1970 Chevelle Duramax Hot Rod, '04 LB7/TH400-gear vendor, S475/factory IHI, 65% inj, 10 mil pump, SoCal AF cam, Valve springs, Push Rods, LBZ rods..... 10 sec cruzer :-)

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Old 06-02-2018, 07:39 PM
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2x ^^

How did you read the boost

37psi - 14.7psi = 22.3 if read from boost sensor. Not high
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Old 06-02-2018, 08:20 PM
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^^ exactly where I was going with my question....
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1970 Chevelle Duramax Hot Rod, '04 LB7/TH400-gear vendor, S475/factory IHI, 65% inj, 10 mil pump, SoCal AF cam, Valve springs, Push Rods, LBZ rods..... 10 sec cruzer :-)

2002 2500HD LLY 6 speed ally conversion
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Old 06-03-2018, 05:14 AM
dcpjfs432 dcpjfs432 is offline
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I see...
I was using a scanner.


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Old 06-03-2018, 08:00 AM
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If you want to see exactly what the turbo is putting out, put in a mechanical gage.
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1970 Chevelle Duramax Hot Rod, '04 LB7/TH400-gear vendor, S475/factory IHI, 65% inj, 10 mil pump, SoCal AF cam, Valve springs, Push Rods, LBZ rods..... 10 sec cruzer :-)

2002 2500HD LLY 6 speed ally conversion
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