well i found this from a website and it explains it pretty well
A bypass valve (wastegate/regulator) allows the turbo system to develop peak charge-air pressure for maximum engine boost response while eliminating the chance of excessive manifold pressure (overboost) at high speed.
The wastegate is precisely calibrated and opens to direct some exhaust gas flow around the turbine wheel. This limits shaft speed which in turn control boost pressure.
but one question remains. when you have a 9lbs spring and you hit it but you high boost is set at 20 then how do you get high boosted with some exhaust bypassing the turbine wheel. wouldnt that at least make the spool time slower.
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