the above explains that the airflow changes direction, not the the turbo stops spinning. what happens to the exhaust gasses then if the turbo stops spinning then?
i can understand how your point is valid that the turbo will be spinning faster using a DV than without, but the guy i spoke to about it used datalogging equipment in his engine and recorded a 0.2s quicker spool up, because of still having + pressure in the inlet tract.
even if the turbos life is shortend by about 10% its still not much.
you dont need to explain anything to me. ive got a good understanding of it all and im deciding not to use a DV on my new build.
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