Quote:
Originally Posted by Alan Smithee
If by that you mean more heat is retained under the hood with a turbo, that is the point I am making. With all of the plastic parts under a modern BMW hood, because of sustained high temperatures inherent to an efficient turbo, I sincerely doubt the ancillaries will last as long as those in a non-turbo (not to mention the turbos themselves). If they have been re-engineered, it is likely for recycle-ability rather than 200,000 mile operation. Anyway, time will tell.
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Take a look at the N20. The turbocharger is tiny. It can't radiate even as much heat as the exhaust manifold. Now consider the catalytic converter right after the exhaust manifold. It actually produces a significant amount of heat. Compared to that, I can't see the turbo having any significant effect on underhood temperatures. The ancillaries are all mounted on the cool side of the engine.
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