Stock boost pressure 2018 1.4 T Cruze - Page 2
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Thread: Stock boost pressure 2018 1.4 T Cruze

  1. #11
    Handbrake Released 17Cruzer's Avatar
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    Apr 2017
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    Quote Originally Posted by mean buzzen half dozen View Post
    Hi guys,

    I installed a boost/vacuum gauge to see what the stock boost pressure is.

    On average I see about 12-14 PSi range maybe it can get to 15 PSI in certain conditions.

    Just curious if that seems about normal?
    For the vacuum side with the engine idling I see about 10-11 inches, does that seem about correct?

    I saw a video on Youtube stating that the stock A/F ratio @ W.O.T is about 10.3? Does that seem close?

    The gauge might not be too accurate because it is inexpensive steeper gauge type. I just wanted something to measure vacuum & boost.

    Thanks
    10.3:1 air/fuel ratio is way too rich. I would expect to see W.O.T. a/f no richer than 12.2:1
    Last edited by 17Cruzer; 07-19-2018 at 11:56 AM.
    2017 Cruze Premier RS Sedan (gas-auto)
    AEM LE2 Air Intake

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  3. #12
    Driver's Ed
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    Northern California, 38.5,-122.6
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    Screenshot_20190321-190703_DashCommand.jpg
    I'm not sure how Dashcommand and Torque would show different values, unless one of them has some damping.
    With Dashcommand, you can log to a csv file and see the values as read.
    This is a screen grab from a log replay.
    2012 Cruze LT/RS box stock.

  4. #13
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    I have my vacuum/boost gauge ported into the throttle body. I get about 30 inches vacuum at idle, and on stock ecu it highest is about 18-20 psi if its pushing it hard


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  6. #14
    Learning about my Cruze
    Join Date
    May 2018
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    52
    30 inches of vacuum seems really high especially for idle.
    Also the boost seems high for a stock set-up. I would think your gauge needs a calibration check.

  7. #15
    Drag Racing Champion
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    According to google.

    30 in. vacuum at sea level. With a .5 in decrease for every 1,000 feet in altitude.

    I got 25 in. in Cali at sea level. At home at 4,500 feet. It don't matter if I'm pulling vacuum in my 7,000 gallon tank trailer or a car ac system. 21 is all I get. I'm not sure what the torque app would read. I've barely used that gauge or the app much.

    Boost pressure was 30 max in my semi in Cali. At the top of Donner pass at 7,500 feet it was 18 I believe. I don't think I even hit 10 in the Colorado mountains at 12,000 plus feet. I haven't been in that truck for 3 years now. I no longer have a boost gauge. And that's a semi with a much larger engine and turbo 3 X the size. I wouldn't expect our 1.4L to even come close to the same numbers.

    Stoichiometric AF was 14.7 on the carburetors. 15.0 with fuel injection. Don't remember the number for idle and WOT. Or what it might be these days with today's Direct injection. I've been retired almost 20 years now.
    Last edited by snowwy66; 05-20-2019 at 02:32 AM.

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