HP drop on N20 Run

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Jul 24, 2008 | 02:19 PM

trever1t

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HP drop on N20 Run

First graph is boost only and second graph is on a 75 shot.
What is causing the HP to drop like a rock at 4000rpm? If I had trans or converter slip I could understand it plateauing but dropping? Bottle pressure was good but on a half fill. Could this be sucking air?

your thoughts please?

Jul 24, 2008 | 04:36 PM

toneloc60

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Just spit-balling here, but perhaps the drop in temp from the n20 caused your boost pressure to drop. Just a guess.

Jul 24, 2008 | 05:10 PM

trever1t

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I should have stated, Magnuson Radix M112 supercharger. The slope in boost is pretty average I think but I do appreciate the response. The "Magenta" lines are the last pull if that helps.

Jul 25, 2008 | 08:45 AM

trever1t

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any other thoughts?

Jul 25, 2008 | 08:56 AM

stevegrizzle

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Looks like a lean spike to me.

Jul 25, 2008 | 12:17 PM

trever1t

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Could be and probably is. Took the bottle out this morning and it weighed 18.4lbs (10lb. bottle) so there is only about 3 to 4 lbs. remaining after 4 runs. Possibly picking up some air?
Pressure of the bottle is still 800lbs in my 65* office