What is the Max Boost Pressure of 2.0 - TerrainForum.net: GMC Terrain Forum
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post #1 of 11 (permalink) Old 05-27-2019, 08:36 PM Thread Starter
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What is the Max Boost Pressure of 2.0

I just connected my phone through OBDII to my 2019 Nox and ran some tests using "Torque" app.

I am only getting a maximum of 5 PSI boost. I thought it was a supposed to be higher then that.

Performance feels good but when I ran a few 0-60 runs it was averaging only 8 seconds. (Runs were 7.2 to 8.4. Hard to find a perfectly level road where I live). I was expecting around 7 seconds or less since the car is advertised as being 6.6 seconds.

Does any one know what the max boost should be and measured the acceleration?
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post #2 of 11 (permalink) Old 05-27-2019, 09:44 PM
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You need to compensate for atmospheric pressure (14.5 lbs) so you're probably closer to 19 psi. There's a way to change it in Torque app that displays normal boost/vacuum in the settings.
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post #3 of 11 (permalink) Old 05-28-2019, 12:01 AM
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Quote:
Originally Posted by victorvdc View Post
I just connected my phone through OBDII to my 2019 Nox and ran some tests using "Torque" app.



I am only getting a maximum of 5 PSI boost. I thought it was a supposed to be higher then that.



Performance feels good but when I ran a few 0-60 runs it was averaging only 8 seconds. (Runs were 7.2 to 8.4. Hard to find a perfectly level road where I live). I was expecting around 7 seconds or less since the car is advertised as being 6.6 seconds.



Does any one know what the max boost should be and measured the acceleration?


stock max boost is supposed to be 20psi according to gmauthority. com


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post #4 of 11 (permalink) Old 05-29-2019, 10:20 AM Thread Starter
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Boost is increase over atmospheric pressure . Normally aspirated cars have zero boost not 14.5 psi.

If GM is adding 14.5 psi to their real boost they are trying some weird mind game.

Real 20 psi boost is extremely high so I would not expect that.

If some one has an ODB2 tool or adapter for their phone it would be nice to see if what they measure is the same as my car.

Thanks
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post #5 of 11 (permalink) Old 05-29-2019, 11:02 AM
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Just curious victorvdc, have you been running 93 octane and did the gas tank have all 93 octane in it? If not maybe the ecu dials back on the boost?
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post #6 of 11 (permalink) Old 05-29-2019, 02:07 PM
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Quote:
Originally Posted by victorvdc View Post
Boost is increase over atmospheric pressure . Normally aspirated cars have zero boost not 14.5 psi.



If GM is adding 14.5 psi to their real boost they are trying some weird mind game.



Real 20 psi boost is extremely high so I would not expect that.



If some one has an ODB2 tool or adapter for their phone it would be nice to see if what they measure is the same as my car.



Thanks
Haha what??

Yea man you're getting 5psi. You're right...



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post #7 of 11 (permalink) Old 05-29-2019, 10:50 PM
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OP, according to the linked article the max boost is 20PSI (over atmospheric pressure).

This engine uses a twin- scroll turbo which has multiple inputs that allow the boost to come up quicker and at lower RPMs, with any excess pressure being controlled via the electronic waste gate.

Here is a little info sheet.

http://gmauthority.com/blog/gm/gm-engines/ltg/
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post #8 of 11 (permalink) Old 05-30-2019, 12:13 AM
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Quote:
Originally Posted by victorvdc View Post
Boost is increase over atmospheric pressure . Normally aspirated cars have zero boost not 14.5 psi.



If GM is adding 14.5 psi to their real boost they are trying some weird mind game.



Real 20 psi boost is extremely high so I would not expect that.



If some one has an ODB2 tool or adapter for their phone it would be nice to see if what they measure is the same as my car.



Thanks


20 isn’t “extremely high” eagle talons and mitsubishi eclipse’ ran close to 14psi stock in the 90s... u could get about 17-18psi with a manual boost controller premium gas without detonation. direct injection has made it possible to push the limits and prevent detonation at higher boost levels. the trifecta tuned cruzes run over 20psi reliably most newer direct injected turbo motors are in the upper teens as far as boost pressures. that’s how they’ve made the motors smaller but still achieve some horsepower. either there is a glitch in the app you are using or there is a problem with ur car. i would think it would throw a code for underboost and not being able to achieve proper “torque management values” if it were truly only making 5psi


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post #9 of 11 (permalink) Old 05-30-2019, 03:07 PM Thread Starter
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Thanks for the suggestions.

The app has a boost calculation mode as an alternative for the MAP sensor reading. Also I have a mechanical test gauge I can try.

Does any one know an easy place to tap a boost gauge into? This engine has a lot of hoses.

I am only running 91 octane which should be enough but i will try a few tanks of 93 if nothing else works
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post #10 of 11 (permalink) Old 05-30-2019, 06:02 PM Thread Starter
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It was the calculation mode in the app. When I went to the alternate mode I now see 19 PSI.

And it spools up faster then I have ever seen in any other turbo.

Just the acceleration is not meeting spec . I am guessing if I find a flat road on a cool day with an almost empty tank of gas I should be able to squeeze another second out of it.

Thanks for your responses /suggestions.
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