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any way to get a few more shots of this manifold. You said twin turbo but I can only see one. Or by quick hack did you mean the little drawing you did there

 

By quick hack, he was referring to his drawing. It is a single turbo manifold, made by Twins Turbo.

 

Taken right off of Garrett Diesel truck turbo's. You could actually buy T6 housings with that built in. We looked at it a few years back. Boost actuated and everything.

Reading the rest of this thread I think Rotary God gave a perfect description that I missed the first time reading.

~S~

 

It actually does everything you just described. It's meant to be used with a non-divided manifold so as not to impede flow from the engine. It's purpose is to have the flow collected into one of the runners. Don't know how it can be any different.

 

Because like the S4 TII design it collects the exhaust pulses into a large volume, then pushes them into a poor flowing shape (single turbo runner with other blocked off) which really will hurt velocity and flow when in single scroll mode; which would be the meat of your powerband with a dual scroll system set up to drop EMP in the top end.

If you design the system for optimal flow with the single scroll as far as runner volumes (velocity) and flow path you will have no compromise in midrange power, and once the dual scrolls are open you will have great top end power as well.

In addition, my experience also shows that the design you show will not hold up to the rotary exhaust pulses hammering it. I tried dividing my wastegate flow twice with a thick stainless divider. It held up to street driving, but when I started racing it tore like paper in short order.

Look at what happens when trying to run a divided turbo flange on an undivided runner on a rotary and you want to add delicate moving parts right there?

The factory S4 design is heavy cast iron and the flapper is supported by the turbo casting in the normal position and out of the line of pulsation when open.