hYpE-R-29

iTrader: (2)

Just have a wuick question to the people with boost/vacuum gauge. When your car is at idle where is your needle pointing at in the vacuum section?...What vacuum is stock idle at?

*sorry if its a retarded question

C2H5OH

iTrader: (5)

It will read vac at idle and during const speed cruising and boost only under load. My idle is something like 15-20 vac, cant remember for sure. Hope this helps

sfwrx2

iTrader: (8)

Its a negative1.something kpa

hYpE-R-29

iTrader: (2)

i've got an autometer...its reading at 23vacuum.....normal??

AWD 20T

iTrader: (11)

Is your car idling different than it did before the gauge install? If not, you're fine.

Wingless Wonder

iTrader: (7)

Common U.S. standard of expressing vacuum on gauges is inches of Mercury (Hg). IIRC, at idle my OEM boost gauge reads -0.06 MPa (megapascals). That equates to 17.7 inches of vacuum. Here is a conversion page:

Metric to standard.

Back in the old carbureted era, a stronger vacuum signal was desirable as carburetors were able to meter fuel more efficiently at low engine speeds. High overlap camshafts on a street engine could reduce engine vacuum at idle to less than 10 inches of vacuum (Mercury). Result: fouled spark plugs, bad fuel economy.

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bringndefinitio

iTrader: (6)

mines is at 19-20 at idle