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[QUOTE="Dzchey21, post: 42324, member: 63"] Food for thought... Just because its a 15 lb spring doesnt mean that its going to open the valve at 15psi of back pressure. The spring in the wastegate is compressed considerably, therefore the spring is preloaded, so to say that the gate will open at 15psi is slightly inaccurate, whats needed to know is seat pressure, or the pressure it takes to begin to lift the valve off the valve seat in the gate... which... really isnt given out in wastegate instructions or tuning. I supposed the proper way to see what seat pressure is would be to weld a pipe shut, put an air fitting in the pipe, and slowely increase the pressure on the wastegate valve and see at what point it begins to open.... might do that before i do my next turbo set up so i know what im working with. I bring this up because we spent some considerable time tuning a truck with max powers on it, had some trouble with the manual regulator, as well as the AMS500 controller, no matter what we did the gate would surge and stay open or closed and not very under control. So we put regulated boost to the top... held the gate open and maxed out the EBP reading on IDS... no matter how little, or how much pressure. As long as there was pressure on the top of the gate it held it shut Moved to the side port put pressure to it, now the gate would blow open early and then not shut fast enough, making a crazy dyno graph reading, as well as making the back pressure surge between 80psi absolute and 55psi absolute, as well as making the turbos act funny. Tried regulated to the top, full boost to the bottom, about the same results tried regulated to the bottom full to the top about the same happened, nothing worked and the gate surged like crazy Got a wild hair to just unhook all pressure to the wastegate top and bottom... magic... it makes 76 psi absolute of back pressure on the nose, and stays there at 55 psi of boost. Nice clean graph on the dyno, ebp graph follows nicely as well. BTW this is with a "15 lb spring" but in short, jeremy is right, your gate is probably doing something to relieve back pressure right now, putting pressure to the top of the gate to hold it close will probably reveal that the gate is doing something afterall. [/QUOTE]
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