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Originally Posted by 320touring
the alternators fitted to the e30 have a sort of fanblade/waterwheel setup on the pulley driven by the belt-could that be modded to produce something similar to the hole solution you've suggested?
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Not a bad idea, but I imagine that is there for cooling. If I use it for a turbine, I'm not only stealing that cooling capacity, I'm heating it up! I imagine that ending in a bad way.
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Also what consideration haave you given to rusting to the exhaust?
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Almost none at this point. Most exhausts are stainless so IMO its not a huge deal. Of course heat transfer through SS is pretty bad, so that is a concern.
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Its a great idea, but what effect will the additional sleeve on drag under the car if it hangs lower than the rest of the exhaust, or do you envisage using the setup on the downpipe or manifold?
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I don't know where I'd place it yet. Obviously the closer to the engine the more available power and less need to insulate the exhaust. In the environmental aspect of it, you'd not want to rob heat from the CAT though.