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Does the BS cause the ECM to increase boost proportionally across the boost range? I have the Edge/Attitude monitor which I know reads the boost the ECM is being fooled into seeing. If I want to figure how much boost the motor is actually seeing, could I calculate it by adding a flat percentage across the board? For example, if the BS adds 15%, when I read 10lbs is it actually getting 11.5lbs, does 20lbs mean its getting 23lbs?
If so, what percentage increase does it add?

Also, it feels that boost is added even at idle. When I'm reading 0 boost at idle, there is more now turbo whine, and is seems to take more brake pressure to hold it back.

Good advice: turn the power level down with this thing installed on stock tranny.
 

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You cannot guess or calculate boost on these. Also, the Edge Attitude tends to read high as compared to mechanical gauges. There is just no substitute for a mechanical gauge.
 
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