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To much vaccum???

Posted by guamboyeli, Jan 8, 2014

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  1. guamboyeli

    guamboyeli Proven Member

    111
    2
    Joined May 24, 2012
    North las vegas, Nevada
    I have a 1g FWD talon...mild head work,FMIC,small 16g. Emissions delete...
    I dont know the correct word for it but my vaccum is around 30.. Is this a good or a bad thing???
     

    1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  2. GRAVEDIGGER

    GRAVEDIGGER Proven Member

    2,700
    101
    Joined Nov 26, 2007
    Uniontown, Ohio
    Is that at idle, or on deceleration? If that is at idle, what gauge are you using to get that reading? It could be a bad gauge.
     

    2K  18

    1991 Eagle Talon TSi AWD
    12.149 @ 115.940 · 1G DSM
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  3. gieri002

    gieri002 Proven Member

    734
    0
    Joined Feb 25, 2008
    Lake Minnetonka, Minnesota
    The spec for vacuum at idle from the factory service manual is 18 in HG minimum. There is no max spec. Are you still on stock cams?
     
  4. eDeclpse92

    eDeclpse92 Proven Member

    250
    3
    Joined Sep 6, 2008
    Belleville, Illinois
    It sounds like you might have a bad gauge. I don't see any other way it could read that low. Has this just started happening or did you change something and this is now the result of that change? I'm assuming your boost gauge is connected to intake manifold pressure. Is it t-d off with anything else? (I'm also assuming you are reading your vacuum at idle)

    Also are you idling high?
     
  5. miliman13

    miliman13 Proven Member

    1,566
    270
    Joined Jan 1, 2011
    tampa, Florida
    Excuse me for jumping in but ,I would like to mention that on my 6 bolt 9:1 , with 272's at idle (1000rpm) i read around 10-12 vacuum on a NEW AEM gauge. in the past i have always read 18-22 on a stock dsm. hoping someone could throw in their 2 cents.
     

    2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    1K  0

    1998 Mitsubishi Eclipse GSX
    13.066 @ 106.880 · 2G DSM
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  6. rich3389

    rich3389 Proven Member

    829
    5
    Joined Dec 27, 2006
    Ocean springs, Mississippi
    The vacuum will be lower at idle with after market cams.
     

    817  10

    1990 Eagle Talon TSi AWD
    manual · 1G DSM
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  7. miliman13

    miliman13 Proven Member

    1,566
    270
    Joined Jan 1, 2011
    tampa, Florida
    thanks man, any specific reason for the different readings. ?
     

    2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    1K  0

    1998 Mitsubishi Eclipse GSX
    13.066 @ 106.880 · 2G DSM
    Loading...
  8. untouchablecc

    untouchablecc Proven Member

    693
    7
    Joined Mar 21, 2008
    Mt. pleasant, Pennsylvania
    My 16g car with emmisions delete was around -25 for vac. Your gauge could be off or high idle as mentioned.
     

    607  0

    1996 Eagle Talon TSi AWD
    manual · 2G DSM
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  9. xuberantz

    xuberantz Proven Member

    55
    1
    Joined Sep 24, 2007
    Edinburg, Virginia
    I've typically seen around -18 to -20 at idle on a stock motor. It's typically lower on cars with cams because of valve overlap.
     
  10. TSicktalon

    TSicktalon Proven Member

    240
    0
    Joined Sep 8, 2008
    Eastern, North Carolina
    My Spyder sits at 20-21, stock cams with recent rebuild. Lowest I ever see on decel is 24. This is on a 5 month old Autometer mechanical.
     

    518  0

    1998 Mitsubishi Eclipse Spyder GST
    12.569 @ 120.550 · 2G DSM
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  11. guamboyeli

    guamboyeli Proven Member

    111
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    Joined May 24, 2012
    North las vegas, Nevada
    It's at idle.... It's an xtune... I'm on stock cams...
     

    1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  12. miliman13

    miliman13 Proven Member

    1,566
    270
    Joined Jan 1, 2011
    tampa, Florida
    THERES your problem i trashed alll my xtune gauges not one read accuratly
     

    2K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    1K  0

    1998 Mitsubishi Eclipse GSX
    13.066 @ 106.880 · 2G DSM
    Loading...
  13. guamboyeli

    guamboyeli Proven Member

    111
    2
    Joined May 24, 2012
    North las vegas, Nevada
    Thanks a lot guys...appreciate the help... What's some good brands for gauges???
     

    1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  14. GRAVEDIGGER

    GRAVEDIGGER Proven Member

    2,700
    101
    Joined Nov 26, 2007
    Uniontown, Ohio
    You may get some different opinions on that, but I have always used Auto Meter and they have always been good for me. :thumb:
     

    2K  18

    1991 Eagle Talon TSi AWD
    12.149 @ 115.940 · 1G DSM
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  15. renovatdkitchen

    renovatdkitchen Proven Member

    495
    22
    Joined Sep 25, 2011
    Toronto, ON, Canada
    A got glow shift gauges for cheap off eBay. They're a little off, but only by 1-2 psi because the paper with the markings isn't centred properly.
     

    Street Build 713  4

    1999 Mitsubishi Eclipse Spyder GST
    awd · manual · 2G DSM

    Street Build 5K  15

    1998 Mitsubishi Eclipse Spyder GST
    11.568 @ 123.87 · 2G DSM

    Street Build 2K  5

    1992 Eagle Talon TSi AWD
    12.790 @ 105.14 · 1G DSM
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  16. gieri002

    gieri002 Proven Member

    734
    0
    Joined Feb 25, 2008
    Lake Minnetonka, Minnesota
    Autometer, Innovate, AEM, Defi, Prosport... The list goes on and on, just do a few searches on this forum and you'll find the perfect gauge for your goals.
     
  17. Boostdriven

    Boostdriven Proven Member

    606
    12
    Joined Jan 7, 2010
    Pasco, Washington
    If you get a new gauge and your vacuum is still high (23+) then you might have a problem with cam timing. Check to make sure that your timing marks still line up like they should.
     

    703  0

    1997 Mitsubishi Eclipse GSX
    13.355 @ 104.920 · 2G DSM
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  18. eDeclpse92

    eDeclpse92 Proven Member

    250
    3
    Joined Sep 6, 2008
    Belleville, Illinois
    Boost gauges are on the classified ads here all the time it seems like. You could find a pretty good one on there. That's where I would check if you wanted to save a little bit of money. The brands mentioned above are all good. I have a Stewart Warner one.
     
  19. guamboyeli

    guamboyeli Proven Member

    111
    2
    Joined May 24, 2012
    North las vegas, Nevada
    thanks alot guys...i got some auto meter cobalt gauges....
     

    1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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