Vacuum at idle and during deceleration acceptable kpa?
My NB2 idles at 37-38kpa @ 900rpm (14.5 AFR, 17 degrees timing) and during hard deceleration pulls a vacuum of 21kpa.
Do these numbers look a little on the high side? I'm thinking the idle vacuum should be more like 29-32kpa and the decel vacuum more like 12-15kpa. |
Numbers look high to me.
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High. Should be 28-32 at idle and 12-16 at full decel in gear.
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Suspecting a vacuum leak I re-torqued the upper intake manifold & throttle body bolts. Tightened up the boost hose to throttle body inlet. RTV'd my EGR blanking plates (threw away the old gaskets). Checked the vacuum lines to EFR recirc valve and to ECU.
Now idling at 34kpa and decel is 17kpa. Good enough? |
That's where I am and my car runs great, nothing to worry about IMO
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Not a vac leak situation. The car requires too much air to idle at the target speed. The car does not pull sufficient vac during decel.
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Originally Posted by Ted75zcar
(Post 1609483)
Numbers look high to me.
Originally Posted by Reverant
(Post 1609486)
High. Should be 28-32 at idle and 12-16 at full decel in gear.
Originally Posted by der_vierte
(Post 1609490)
That's where I am and my car runs great, nothing to worry about IMO
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Originally Posted by Ted75zcar
(Post 1609491)
Not a vac leak situation. The car requires too much air to idle at the target speed. The car does not pull sufficient vac during decel.
Guess I'd better finish my forged motor build. :likecat: |
Originally Posted by allofit
(Post 1609493)
Thanks Ted. If you're suggesting the engine is worn/wearing out that wouldn't be unreasonable. It's a 110k mile totally stock motor that's been abused by an EFR most of this year. Still has 185psi compression across the four cylinders though.
Guess I'd better finish my forged motor build. :likecat: But yes, a less than healthy motor qualifies as well. |
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