Not true I dont think. Not all turbo cars have dump valves. Modern ones, yes, but older models didnt get them from the factory.Quote: Originally posted by S600HBY on 11 March 2003
All turbo cars have dump valves, standard dump valves recirculate air back into the inlet where as atmospheric dump valves dump it into the air hence the whoosh sound on lift off. Not a real performance gain just sounds good if you like that sort of thing.