BOV vs wastegate

[speedracer91]

Whats the diff. between a bov and a wastegate, and do both come on turbo cars?

 

[clownface]

Not all turbo cars have bovs, but i think all have wastegates. DSMs have both. A wastegate controls the boost by regulating the exhaust flow to the turbine wheel. A BOV releases the compressed air from the intake charge pipes to prevent all the pressure from hitting the turbo, i think thats the jist of it, someone chime in if im leaving something out or if im just wrong.

 

[99gst_racer]

Whats the diff. between a bov and a wastegate, and do both come on turbo cars?

Well they are both vacuum pressure controlled valves designed to bypass airflow. The difference is the wastegate is designed to bypass exhaust gas from the turbine wheel. And the BOV is designed to bypass the intake charge in the intercooler piping when the throttle plate is closed. They both basically do the same thing. One is for cool air going into the motor and the other is for hot air coming out of the motor. All newer turbochargerd vehicles have both. Some older turbo'd cars didnt have BOV's. All turbo'd cars have some sort of wastegate though. Whether it be an internal or an external. An internal gate comes on the cars from the factory.

I hope I answered your questions.

 

[napkinthief]

would having both cause a decrease in pressure?

 

[Defiant]

Wow.

A BOV releases boost when the throttle is closed. On DSMs, the pressure is recirculated back to the intake side of the turbocharger to save some energy, and the air/fuel system is set up to depend on this recirculation.

A wastegate opens to let exhaust pressure bypass the exhaust turbine in order to keep from creating too much boost. By its nature, a turbocharger will continually increase its output until something fails. A wastegate forestalls this eventuality.

 

[Syndicate13]

Well they are both vacuum pressure controlled valves designed to bypass airflow. The difference is the wastegate is designed to bypass exhaust gas from the turbine wheel. And the BOV is designed to bypass the intake charge in the intercooler piping when the throttle plate is closed. They both basically do the same thing. One is for cool air going into the motor and the other is for hot air coming out of the motor. All newer turbochargerd vehicles have both. Some older turbo'd cars didnt have BOV's. All turbo'd cars have some sort of wastegate though. Whether it be an internal or an external. An internal gate comes on the cars from the factory.

I hope I answered your questions.

Our cars do use factory internal gates but some older Audis used external wastegats routed back into the exhaust. The 10v and 20v 5 cylinder turbo motors both had 44mm external gates from the factory. They are pretty stout units too, it's just too bad they are physically huge and not practical in a DSM. The new Duramax diesels don't use wastegates to control boost, they use the variable vane technology Garrett was working on a few years back.

 

[tsi4ya]

Our cars do use factory internal gates but some older Audis used external wastegats routed back into the exhaust.

So internal wastegates vent out then and external vent back into the exhaust? SOif you would run in internal wastgate then you would have more power then a external wastgate b/c you dont have that much back pressure

 

[amp9211]

http://auto.howstuffworks.com/turbo.htm

read this and see if it helps answer your question...

 

[boostedinaz]

So internal wastegates vent out then and external vent back into the exhaust? SOif you would run in internal wastgate then you would have more power then a external wastgate b/c you dont have that much back pressure

Either one can be routed back in or dumped externally. Overall an external is a better route to go, but also more expensive. All of this will depend on what turbo you run and how you use it.

 

[Syndicate13]

So internal wastegates vent out then and external vent back into the exhaust? SOif you would run in internal wastgate then you would have more power then a external wastgate b/c you dont have that much back pressure

Internal is also sometimes referred to as integral since it means that the wastegate is integrated into the turbine housing of the turbo. External means that the wastegate is a seperate piece from the turbine housing. Either can be made to dump to the atmosphere by way or an O2 dump for an internal gate or just not routing it back with an external.