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Power Strokes
6.4 Aftermarket
waste gate feeding atmo
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[QUOTE="mike@haller's, post: 976921, member: 105"] Making the gating into the atmosphere work is tricky. You wanna drive the low pressure turbine hard but not lose all the drive pressure spinning the high pressure turbine when you open it. Ive been tuning on a max power truck the last few days. The truck has two gates one feeding the low pressure turbine, one going to atmosphere. On the street tune it normally runs I open the gate to the low pressure around 2500rpm. And also command higher bp to close the vanes and keep the high pressure spinning good. Then open the atmosphere gate around 2600rpm. Doing this nets 29psi out of the low pressure, 65psi total and drive ends up 3psi lower than total boost at 62psi. If I crank the atmosphere gate down one turn, leave the gate between stages alone and limit the vgt close point. Boost jumps to 32psi atmosphere, 74psi total and drive jumps to 79psi. The truck also gains over 100hp. In my opinion though that's a race or dyno setup. If you set yours up with just an atmosphere gate and an aggressive bp file you will do fine. There is power in gating between chargers, but its alot of effort to get it all. [/QUOTE]
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waste gate feeding atmo
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