im a little new to the turbo tech . . . do all turbos require a wastegate?? . . . . i heard that the new vw 1.8t has no wastegate? is this true? and does a BOV replace the wastegate? or is the BOV a separate part? . . . so if a certain turbo has no wastegate then a BOV can't be put on that particular turbo?? just a few questions to i need cleared up if somebody could help with their expertise . . . . . thanks - - - and also, the boost that is expelled through the wastegate . . where does this come from . . where is the wastegate or BOV located on the turbo hook-up?? ... . sorry for all the questions

 

go to www.howthingswork.com and look up "turbochargers"

 

you are correct. most O.E turbos dont use a wastegate. perhaps they dont run as high boost ??

 

A wastegate is used to control how much boost is produced by the turbo. The turbo is spun by exhaust gases that pulse on it. This spining of the turbine is what creates the boost. This allows the engine to spray more fuel into the engine which makes more power and more exhaust gases that spin the turbo even faster. This is an endless positive feedback system which will cause the turbo to spin faster and faster until the turbo spins to death, or most likely blow the motor.

The wastegate's job is to vent the exhaust gases away from the turbo once it achieves the boost that you want. Therefore the turbo will not spin any faster because the exhaust gases are now bypassed and out the exhaust pipe without touching the turbo.

A BOV is used to prevent compressor surge. This happens when you are boosting and you suddenly let off the throttle, such as when you shift gears. The throttle body is now closed and it is like slamming a door shut on the boost. The boost then backs up, causing the airflow to travel backwards, back towards the turbo. This can cause damage eventually to the turbo because the backup air is trying to spin the turbo in the opposite direction. The BOV prevents this by opening a valve which lets the compressed air out before heading back towards the turbo. It keeps the turbo spining the right direction so that when you jump back on the throttle, the boost will spool back up quicker.

Hope I cleared things up a little instead of making it more complicating.

Jeff

 

Jeff: That's the best way to explain it. Good job man! If still that won't be easy enough for others to understand, I dunno what will.