Excellent posts. Lots of good info. The only thing that I find missing is that instead of using a blow off valve and wasting all that precious compressed air, you can instead use a diverter valve. This valve is used to recirculate this air back to the compressor, also maintaining pressure in the system.
The blow off valve not only wastes potentially beneficial power that may result in lag, it also wastes fuel. The mass air flow sensor, MAF, is tricked into thinking that this air is going to be fed into the intake system and tells the computer to dump an appropriate amount of fuel to compensate. This air never makes it and the engine is temporarily "flooded." The unburned fuel will then make its way into the exhaust system and will probably explode inside the exhaust, increasing emissions and in the right applications, can create flames from the exhaust. Most blow off valves are designed to make the "pssssh" noise. A valve performing the same functions could be silent, but they wouldn't sell many. If that sound is all you want, you can buy noisemakers from ebay that fit in your exhaust to do the same thing. If you want the extra power, to save more on gas, and to keep the exhaust system safe, you might consider a diverter valve for your daily driver.
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