umm.. not sure, but when you give it 3/4 throttle and hold the brake and have it at full boost, you would be really really lean. 20lbs of boost, and not full throttle = really lean. id be scared of hurting something. I understand you go full throttle when you let off the brake, but waiting for the three honks may be a little long to be that lean. Unless you mean, just floor it and hold the brake and try to keep a constant speed.. then the A/F may be fine..
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