13 in/hg of vacume is this normal (rb20)

[RB20DETodd]

Hello, ever since i put my boost gauge in i idle at 13 in/hg is this normal? and i have no boost leaks.Autometer gauge thanks

[jdmser]

That about what I idle at between 13 and 15 in/hg. When coasting its about 20in/hg.

[Yellow4g63]

Strange when I had one hooked up to my RB20 I go 20" at idle but maybe I was looking at it wrong.

[eh?]

below 15 and I'd be looking for problems. Vaccum leaks is not the only thing that causes low vaccum. Timing/ fuel can too.

[Joe]

mine went from 18-20 to 13-14 after i retarded the timing for a summer event (105 degree air temps + turbo = bad)

[RB20DETodd]

Could low vacume like that be a result of low engine compressions?

[jdmser]

The first time I checked my timing it was at 20 degrees and my vaccum was close to 20in/hg. I retarded it to 15 degrees and thats when my vaccum went to 13-15in/hg. I also felt like I lost some power, hmmm.

[Shahee1]

My gauge registers between 18 - 20in/Hg ...

[Joe]

The first time I checked my timing it was at 20 degrees and my vaccum was close to 20in/hg. I retarded it to 15 degrees and thats when my vaccum went to 13-15in/hg. I also felt like I lost some power, hmmm.

RB's are VERY sensitive to timing.

[Yellow4g63]

The first time I checked my timing it was at 20 degrees and my vaccum was close to 20in/hg. I retarded it to 15 degrees and thats when my vaccum went to 13-15in/hg. I also felt like I lost some power, hmmm.

Put it back to 20. I thought mine would run better at 15 too but it felt alot slower + I was running an Auto ECU at the time too.

[SeVa-S13]

I actually ran about 21-22 degrees.

He wnt and looked at my car for me to check out a supposed idling problem seeing as I'm not there to fix it myself. He noticed my engine pulled alot more vacuum than his, hence this thread.

[RB20DETodd]

I actually ran about 21-22 degrees.

He wnt and looked at my car for me to check out a supposed idling problem seeing as I'm not there to fix it myself. He noticed my engine pulled alot more vacuum than his, hence this thread.

ding ding ding... what do we have for him johnny haha, i im pulling about 12 in/hg 13 if im lucky ill check the timing but ooo i just got the afc2 in today!!!