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YMMOT

Sequential compound turbo set up

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Here are a couple pictures to wrap your head around. This is the design of the turbo set up on BMW Diesels

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What do you think, Nathan? The next step in MPI towing twins?

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I don't know if it is needed or if there is a advantage to it. I do know it would be a bit of a PITA to plumb but not impossible. I'm not sure if I like the valving idea as it is layed out either. The canister on the bypass would probably need air assist to help it close because I don't think the pressure differential would close it fast enough.

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That first one looks like an M.C. Esher...

Is there an advantage to that over the standard twins we run on our diesels? It doesn't seem like it to me... but I am not the turbooligist.

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I think they do the by-pass in order to keep the boost levels down. They are doing this on a BMW diesel that probably is not wanting to run at 50psi+. My guess is they went this route for quick spool + high Power. I'd be willing to bet that at nominal speeds the by pass is open.

Sound like a reasonable theory, Nathan?

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Guest ShanesLB7

I talked to Mark (53 willys) today and he blew the head gasket on his VW TDI at 20 psi of boost...:wall: :wall:

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