where in vaccum should my gauge read at idle
Mar 14, 2006, 02:01 PM
#16
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Mine are in the low teens. I have 272s. Here's a thread with some more data specifically with cams:
https://www.evolutionm.net/forums/sh...highlight=inhg
https://www.evolutionm.net/forums/sh...highlight=inhg
Mar 14, 2006, 09:39 PM
#20
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ok mines reads about 21hg. But when the car is turned off its one dash below 0. Its a defi d gauge i think my gauge is bad anyhow becuase stock 05 evo wot boost should be about 21 right? mine is just hitting at 19 and tapering off to 15. Ive got it tapped at the vacuum line comeing from my blowoff valve which i did with the autometer i had it and read correct so i dont think thats the problem where i have it tapped. Im going to get ahold of works tomorrow and see if they can swap it out for me. Do you guys think i might have a bad gauge specially since it doesnt read 0 when its turned off??
Mar 17, 2006, 07:39 PM
#23
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Im in NorCal, my Vac at idle is 19-21 inhg. Is that normal for me or is something wrong? I have a Defi BF boost gauge. Also it spikes to around 24-25 inhg when I let off the gas...normal?
May 26, 2006, 03:10 AM
#28
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maybe your ac is on? just installed a boost gauge in a friends gti and his vaccum changed by a factor of 5 HG every time he turned on/off his AC...dont know if this is true of the evo
May 26, 2006, 05:12 AM
#30
There are a lot of things that affect vac at idle AFR, cams, timing. The cammed cars running factory ECU's will have weaker Vac, timming at idle is 7 to 10. Up the timming alittle and the vac would come back alittle. Vac at idle really isn't important as long as the car idles strong and doesn't stall.