Attention: TDR Forum Junkies 
http://home.att.net/~jason510/ManualController.htm
Is this a "bleed"?: No. It is a pressure-controlled device, unlike a bleed. One big disadvantage of a bleed is that the boost signal is always acting on the wastegate as the boost builds. This means that the wastegate is allowing exhaust gas to bypass the turbine at the exact time you need it to be spooling up your turbo. The SD Boost Controller holds the signal from the wastegate until it reaches the level that you have set. Because of its rapid actuation, "spiking" (momentarily exceeding the boost limit) is almost completely eliminated. Some electronic controller companies actually try to promote spiking as a positive feature, because their controllers cannot react fast enough to accurately control the problem.
http://www.dawesdevices.com/boost.html
Is this a "bleed"?: No. It is a pressure-controlled device, unlike a bleed. One big disadvantage of a bleed is that the boost signal is always acting on the wastegate as the boost builds. This means that the wastegate is allowing exhaust gas to bypass the turbine at the exact time you need it to be spooling up your turbo. The SD Boost Controller holds the signal from the wastegate until it reaches the level that you have set. Because of its rapid actuation, "spiking" (momentarily exceeding the boost limit) is almost completely eliminated. Some electronic controller companies actually try to promote spiking as a positive feature, because their controllers cannot react fast enough to accurately control the problem.
http://www.dawesdevices.com/boost.html
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