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Message: <blockquote data-quote="ward" data-source="post: 139857" data-attributes="member: 25583"><p>I would test it (the pressure) with the engine under a light load as with no load at 2800 rpm it is still just at idle, exhaust pressure rises under load and hince turbo pressure will increase, semi trucks with turbo pressure gauges see more pressure under load yet no rpm change however the fuel used is raised as it loads, the old 1980s and 1990s trucks you could hear the turbos spool up under load as the semis would hit small grades and hear them let off once they hit the top of the grade.</p></blockquote><p></p>