Still vacumm at WOT???

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Apr 9, 2012 | 08:48 PM

Nver2loud

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Joined: Apr 2007

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From: Mc Farland Wisconsin

Still vacumm at WOT???

Hey All,
During some datalogging, it has been noticed that my car does not ever go to 100kpa, it will start at 99 and go down to about 97 as the rpms increase. Has anybody ever seen this?? I went through some logs from last year and it did the same thing, and I have since added a cam, ls6 manifold, changed the map sensor.
Basically looking for other ideas to check, as most anything regarding a leak has been changed.

thanks again,
Josh

Apr 9, 2012 | 09:15 PM

ZeeOSix

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Joined: Mar 2002

Posts: 5,955

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From: PNW

100 kPa = 14.50 psia.

ATM pressure is normally around 14.7 psia.

Yes, there will always still be a slight vacuum inside the intake manifold (only 0.2 psi in your case) on a NA engine when at WOT.

Apr 9, 2012 | 09:32 PM

Nver2loud

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Joined: Apr 2007

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From: Mc Farland Wisconsin

For something so simple, it sure has confused the crap out of me for some odd reason. Thanks for the clarification

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