Originally Posted by
chaffe
Good info, Can you explain How VNT turbos work? they dont have wastegates and have variable AR exhaust housings? i understand that they basicaly tighten up (small ar) and open up (big Ar) but how do they stop the turbo over speedeing with no wastegate? Ive had one in bits and seen all the vanes and how it moves.
vtn work by using a too bigg an exhaust housing ,so when the vanes are wide open
the exhaust it too big to drive the turbine wheel at too much speed ,
when vanes are closed down gas speed hitting the turbine wheel tips drive it quick and spool quick