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Message: [QUOTE="TyCorr, post: 93751, member: 1451"] They only hold so much pressure. The diaphram inside the gate will open at a preset value. The gate is a pressure relief valve that allows you to run a pump or series of pumps at their efficient points yet not have to use all of the available output. Its easier on the pumps(compressors) to be running along at a low point in their map. Lets say you have a s5xx for a low pressure turbo, to prevent blowing the heads off the motor you decide that you want to gate it for only 12psi(this is just an example) and then that 12psi/____cfm will be further compressed in the high pressure stage. So you set the gate to open at 12psi(you can pre-set it by hooking it up to an air compressor that is regulated to 12psi) and anything that is produced in excess of that 12psi will be emitted from the outlet of the wastegate. In diesels its usually dumped into the exhaust to keep the smoke contained. This is really the difficult part, deciding which pressures are to be allowed in each stage. Egt, total manifold pressure, driveability, and power are all interconnected and changing pressure at one gate can TOTALLY affect what the other charger does. For instance, lowering the allowable boost of the high pressure by lowering the pressure that the wastegate will open at, will lower the pressure at the low pressure charger too. Id say tuning them is the hardest part. Although using a proven setup, you could mimic what someone else already tested and used. [/QUOTE]

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