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About right Posted by Ari [Email] ![]() ![]() In Reply to: Is this correct boost?, Gary, Sun, 17 Aug 2008 18:15:28 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Full boost on a CS should be 5.5 psi. From what I can tell, the gauge reads PSI in boost, but inches of mercury in vacuum. -30 inches of mercury is full vacuum, because normal atmospheric pressure is ~30 inhg.. When cruising, you have a moderate throttle opening, you'll be running at vacuum, so 10 inhg less than atmospheric (20 inhg absolute) seems about right. At idle, the throttle is closed, and the engine is pumping against a closed throttle. You'll have some serious vacuum - 20 inhg (10 in hg absolute) is also about right.
With the car off, it should be reading right around 0.
The fact that the gauge reads in different units between boost and vacuum can be a little confusing.
posted by 99.162.183...
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