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Loss of oil pressure when boosted

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Old Mar 29, 2021 | 01:59 PM
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Lightbulb Loss of oil pressure when boosted

Running a 6.0 LS Pro Charged with 20 psi boost, oil pressure runs at 70 psi until it's boosted, as soon as we apply boost the oil pressure starts dropping and ends at 50 psi with 20 psi boost. As soon as soon as the by-pass valve opens the oil pressure goes back to normal at 70 psi, testing was done on a wheel dyno making 1000 hp at the wheels.
Engine is completely re-build from top to bottom and previously broke in with 2 hours of run time. Removed filler cap and opened both vents from valve covers with very little change, very slight vapors escaping.
Where can this pressure be going and why is it related to boost?
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Old Mar 29, 2021 | 05:57 PM
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Are you using an electric or mechanical gauge?
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Old Mar 29, 2021 | 06:41 PM
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Digital read out LCD screen
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Old Mar 29, 2021 | 08:17 PM
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Install a mechanical gauge to verify the reading. I'd say you have an electrical issue not mechanical issue.
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Old Mar 30, 2021 | 04:50 AM
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Couldnt it just be because you are loading the turbos? Does the oil level ever change?
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Old Mar 30, 2021 | 07:09 AM
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Originally Posted by Jimbo1367
Couldnt it just be because you are loading the turbos? Does the oil level ever change?

States: Running a 6.0 LS Pro Charged with 20 psi boost

there are no turbos
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Old Mar 30, 2021 | 07:27 AM
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Are you running a high volume oil pump? If so, is it possible that you are having a oil starvation issue as boost/engine speed increases?
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Old Mar 30, 2021 | 09:37 AM
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Originally Posted by jordoza
Install a mechanical gauge to verify the reading. I'd say you have an electrical issue not mechanical issue.
THIS, I've had more than one electric gauge give me funky readings that were debunked with a mechanical gauge.
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Old Mar 30, 2021 | 09:41 AM
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What is the overall system voltage doing during a run? Do you have that data in the log?
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