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How's your car drive? The ECU may not be commanding as much boost because it doesn't need to. The Cruze is a torque controlled throttle and boost system. What this means is that the ECU uses throttle input to determine the amount of torque it needs to apply to the drive axle to respond to the throttle. If this torque doesn't require boost then no boost will be requested. If it means the full 20 lbs of boost is needed then the ECU will attempt to have the engine and turbo provide 20 lbs of boost.

Also, there is quite a bit of headroom in the stock boost system. Those of us who drive at high altitude know this car doesn't suffer from power losses until you approach 11,000 ft, and even then there's more than enough power to shoot up the side of the mountain if you down shift to 3rd.
 
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