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Message: [QUOTE="TARM, post: 102509, member: 578"] It will work not much if any better than running that big atmosphere turbo as a single, likely worse. You can play this thing out if you want; as you know, I am all for working things out from the ground up to learn new things but they need to have good bases in mech and science and this is where its a no go. You loose most all the benefits of the compound as you are dumping the majority of the early heat (and do not think for a second that heat is not the primary thing that makes things go round and round) That early (low rpm heat in that HUGE turbos turbine will be of little use to the HP once it gets there and the small amount the engine is creating at those rpms will not be but a drop in the bucket of what is needed to spool that big atmo turbo turbine. In fact it may very well never get on top. If it does at best you will have a top end in a extremely small rpm band width with no bottom end. With every shift you will likely end up under the turbo again. This is if it spools fully at all depending on what you were to chose for it. Just look how you properly size a turbo, specifically the turbine, for good bottom end response and boost. If someone with Compounds has egt sensors at both the manifold and the intermediate pipe before the atmo turbine you could see the dif in egts. Do some reading on turbine maps and how to read them. You basically need that flow ( they show in lbs of air) where the map curve flattens out to lite the turbo. Until then you are in the spooling up phase. You need to be there with the manifold turbo before you can ever hope to build enough flow achieving enough of a PR in the turbine to spool up that big turbine of the atmo turbo. This if course is depending on size of the systems parts etc.. But in general you need to energy or ci created by the manifold turbo to get the atmosphere turbo spun up and then have its addition feeding into the system (becoming self sustaining) and driving the whole thing creating more energy [/QUOTE]