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Power Strokes
6.4 Aftermarket
3 stage vs 2 stage tripples
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[QUOTE="Lil' Pete, post: 480467, member: 7254"] A Pressure differential is what happens when pressure flows over a restriction, in a traditional compound setup the primary turbo feeds the secondary turbo on the intake side, but on the exhaust side the secondary turbo feeds the primary turbo, so you have a large pressure differential driving a small turbo and a smaller pressure differential driving a larger turbo, thus high back pressure. This was my question as well. So if i understand correctly, the only benefit of having two smaller primary's is faster spool up for the same max air flow, or the same spool up time with more max air flow potential? WOW i think i got all that, thanks for the detailed post. In my thinking, on a parallel compound set up, there are two smaller primary (atmo) turbos, one off each head then the exhaust gasses merge together to feed the secondary (hp) turbo. Because of the heat and pressure drop across the two primary's the BP in the hot pipe may only be 35psi, but because the intake pressure on the compressor side of the secondary Is already 35psi (fed from the primary's) a 35psi drop on the turbine side of the turbo, equals a 35psi increase on the compressor side 35+35=70psi. Even tho you only have 35psi driving the HP turbo its still a pressure differential, and because the atmo's have already spooled, the HP is not having to pull air through the atmo its work is easily done. That is if we lived in a perfict world, and all turbos ran at a 1:1 ratio. Now make the two primary's VGT's and i think it would be a killer setup. Any of that make sense? [/QUOTE]
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