T tsaltario Still learning!!!!! Joined Jul 25, 2006 Jul 16, 2008 #1 Is there a normal negative boost level you would expect with our cars while at idle? Mine sits around -12#'s when at idle. Thanks TJ
Is there a normal negative boost level you would expect with our cars while at idle? Mine sits around -12#'s when at idle. Thanks TJ
I imjoesnuffy I just break stuff! Joined Sep 13, 2005 Jul 16, 2008 #2 Vacuum It's called vacuum. :smile: It varies from car to car, many things can affect it like camshaft duration and vacuum leaks. Anywhere from -10 to -28 psi. Obviously more is better for vacuum brake setups.
Vacuum It's called vacuum. :smile: It varies from car to car, many things can affect it like camshaft duration and vacuum leaks. Anywhere from -10 to -28 psi. Obviously more is better for vacuum brake setups.
T TurboDave RIP DAVE Staff member TurboBuick.Com Supporter! Joined May 24, 2001 Jul 16, 2008 #3 tsaltario said: Is there a normal negative boost level you would expect with our cars while at idle? Mine sits around -12#'s when at idle. Thanks TJ Click to expand... Are you sure you're not seeing 12" (InHg) of vacuum? I doubt you're seeing -12# since that would equate to about 24" (InHg) of vacuum. Most cars will idle between 12-16" (InHg) of vacuum. So I believe you're reading the vacuum side of the gauge and misinterpreting it as - boost.
tsaltario said: Is there a normal negative boost level you would expect with our cars while at idle? Mine sits around -12#'s when at idle. Thanks TJ Click to expand... Are you sure you're not seeing 12" (InHg) of vacuum? I doubt you're seeing -12# since that would equate to about 24" (InHg) of vacuum. Most cars will idle between 12-16" (InHg) of vacuum. So I believe you're reading the vacuum side of the gauge and misinterpreting it as - boost.
T tsaltario Still learning!!!!! Joined Jul 25, 2006 Jul 16, 2008 #5 Oh yeah, It probably does read as vacuum. Never noticed the diff. Will check again tonight when I'm driving home. Thanks TJ
Oh yeah, It probably does read as vacuum. Never noticed the diff. Will check again tonight when I'm driving home. Thanks TJ
B benoitthegr8 Sociopathic TR Ownership Joined Mar 21, 2004 Jul 17, 2008 #6 I ran the same thread about a year back, I've got 19-20 InHg of vacuum
D DailyDrifter The Slow and the Curious Joined Dec 5, 2007 Jul 22, 2008 #7 my 212-224 cam idles at 10-11 who needs vacuum :biggrin: