Wastegate
Senior Member
Joined: May 2002
Posts: 4,928
From: Okinawa, Japan
Originally Posted by GarageBoy' date='Sep 11 2003, 09:48 AM
Ok, doesn't the boost blast out when the MBC if it breaks down and save the turbo and engine? And how does the boost controller control internal wastegates. (same as external?)
On an actuated wastegate, it just releases some of the boost pressure going to the actuator so that it will hold the wastegate close longer.
Senior Member
Joined: Jul 2003
Posts: 227
From: in my pants
When you let off the accelerator the throttle body shuts or closes, leaving the pressurized intake nowhere to go but back the way it came (turbo) causing backpressure and putting un-needed wear on the turbo. A BOV releases the Intake charge before it reaches the turbo thus reducing back pressure and reducing turbo lag.
1. how crusial it it to have a BOV?
2. if you are running water injection it it ok to use a BOV, meaning not only air but also water will be thrown though it if you have WI, can it handle that?
Senior Member
Joined: May 2003
Posts: 989
From: Dover DE
Most gasoline turbo systems were designed with a BOV or Recirculation valve in them from the factory. Basically it allows the boost created by the turbo a means to escape when you let off the gas. This prevents compressor surge (air bouncing back and forth between the throttle plates and the turbo) A lot of the folks like them for thier sound when they shift. I prefer the large useful units like the Greddy Type R which just dumps the air, no trumpets, no choked birds, no gerbils sneezing under the hood for me. 
If compreser surge is not released you have a tendancy to cause premature wear of the front bearing and thrust collar in som turbos
Senior Member
Joined: May 2002
Posts: 4,928
From: Okinawa, Japan
Originally Posted by epion2985' date='Sep 12 2003, 02:35 AM
When you let off the accelerator the throttle body shuts or closes, leaving the pressurized intake nowhere to go but back the way it came (turbo) causing backpressure and putting un-needed wear on the turbo. A BOV releases the Intake charge before it reaches the turbo thus reducing back pressure and reducing turbo lag.
1. how crusial it it to have a BOV?
2. if you are running water injection it it ok to use a BOV, meaning not only air but also water will be thrown though it if you have WI, can it handle that?
2. WI is turned on by boost. BOV are turned on by absense of boost. They will never meet.
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