Ok, thanks for the info.
How would this operate in the real world, though. I don't want to have to watch the tach and move a lever every time I take the engine through it's paces. What signal could we use other than the secondaries?
Chris, are you talking a simple plastic or metal pipe, or perhaps some type of aluminum manifold much like the upper plenum we have now? I think plastic would be the way to go, probably the least expensive and easiest to mold to the proper shape given the tight turn that is needed. How are you going to seal it to prevent leaks? Pressure fit?