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Humm You should vane the inlet pipe So it directs the air to the rotation of the larger turbo. Other wise wouldn't you think it might back spool it?
Wat? Like turning veins on HVAC? We are way past laminar flow here...
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What am I seeing? A 6.9L Cummins with two turbos?
? who knows lol But I wouldn't feed a turbo threw another. I don't think it work's that simple.
Its a 5.9L cummins. And its called compound turbocharging. Do work---->
http://www.atsdiesel.com/ats2/templates ... 22272&c=36
And this is old hat in diesel circles. The new hottness is triples. Still two stages of compression, primary stage is split between two smaller chargers then compression into a secondary compressor.
This is BEP's truck btw.