Stock boost pressure 2018 1.4 T Cruze
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Thread: Stock boost pressure 2018 1.4 T Cruze

  1. #1
    Learning about my Cruze
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    Question Stock boost pressure 2018 1.4 T Cruze

    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
    Last edited by mean buzzen half dozen; 07-04-2018 at 10:12 AM.

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  3. #2
    Learning about my Cruze
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    Bump, anyone?

  4. #3
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  6. #4
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    I have no definite information as far as boost specifications, however, the boost numbers you provide are, for the most part, in line with what is generally accepted as normal boost range on a unmodified system.
    The A/F ratio is the norm for a wide open throttle condition......think of the throttle as nothing more than a fuel valve.

    The, at idle, vacuum is lowish but that probably is because this itty bitty turbo is likely adding a bit of boost at idle.....the pinwheel is about the diameter of a silver dollar......so, you really shouldn't take that reading into consideration for general engine health concerns.

    The only time idle vacuum is useful as a diagnostic tool is if the gauge bounces rapidly.......an indicator of a leaking intake valve or a vacuum leak at one of the four port runners.

    Rob
    snowwy66 likes this.

  7. #5
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    A bluetooth obd2 adapter and torque app on phone could be used to confirm the gauge.

  8. #6
    Driver's Ed
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    Question so I have a 2017 Chevy cruze LT 1.4l turbo "LE2" .
    I got myself a little bluetooth OBDII reader and an app called dash command, i have an AEM CAI, now my boost doesnt even reach anywhere near that maybe at like 5k rpms gets to 2 psi according to the app anyone else get that or is it just me and most likely I have the worst boost leak in history(also no codes pop). ATM I'm on deployment so cant really test it but any suggestions on how I should test it and what to look for been doing some research but find nothing other then new turbo due to bypass value being built in.
    Last edited by NCboy94; 07-06-2018 at 07:29 AM.

  9. #7
    Learning about my Cruze
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    I have a boost/vac gauge sitting in the box for my 2011. I'll install it this weekend finally, and see what i get.

  10. #8
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    Quote Originally Posted by NCboy94 View Post
    Question so I have a 2017 Chevy cruze LT 1.4l turbo "LE2" .
    I got myself a little bluetooth OBDII reader and an app called dash command, i have an AEM CAI, now my boost doesnt even reach anywhere near that maybe at like 5k rpms gets to 2 psi according to the app anyone else get that or is it just me and most likely I have the worst boost leak in history(also no codes pop). ATM I'm on deployment so cant really test it but any suggestions on how I should test it and what to look for been doing some research but find nothing other then new turbo due to bypass value being built in.
    Was it reporting correctly before the CAI install? My initial guess would be the OBD2 adapter PID settings in the app are not configured correctly. I had the same issue with mine (I use torquePro), and I have seen others with ultragauge reporting the same low numbers when not setup correctly. According, to [email protected]

    Quote Originally Posted by [email protected] View Post
    Most aftermarket OBD2 gauges use the MAP sensor to determine boost. GM made some changes in 2016 to the way the MAP pids work so most aftermarket OBD2 gauges report incorrect values on 2016+ GM vehicles.
    Check out this thread for some info....

    https://www.cruzetalk.com/forum/377-...ml#post3013970

  11. #9
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    Hmmmm may have to look into that. thank you sir!!! and didnt have the OBD2 reader before the CAI

  12. #10
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    Dash command isn't accurate. You'll get different numbers over torque pro. Which reads deeper vacuum and higher boost.

    Or maybe torque isn't accurate. Either way, the 2 apps read different.

    At my altitude. Full vacuum is 22.5. Torque hit that and maxed out at 5 boost.
    Dash bottomed out at 10.25 and maxed out at 2.5 boost,.

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