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Old 06-18-2005, 04:46 AM   #1
Scooby Newbie
Member#: 89122
Join Date: Jun 2005
Question Hydra vacuum question :)

Hi there,

I have just noticed that my off throttle vacumm on my boost gauge (around 4500-2500 rpm, when the throttle is shut) has raised after I fitted the Hydra. Before it was around -550 bar (app 400 mmHg) now it is around -0.9 bar (app 650mmHg).. Does anyone have an idea on this?? Or is there a cure for that )
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Old 06-18-2005, 11:38 AM   #2
Element Tuning
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
673 WHP Element
Tuning Pro Comp Engine


It sounds like you may have had a leak at your boost gauge/fitting. It's normal to see 610 - 650 mm/hg under heavy compression braking. My gauge also read low and I found that the one way valve at the front of the manifold was damaged.

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