Do i really need a BOV???
02-25-2009, 07:01 PM
#3
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yes, you do!
you need some sort of bypass to release the pressure. when the throttle plate closes, the pressure has nowere to go. it will fight the air being pushed up and slam back into the compressor. my understanding is that it can/will cause damage to the turbo.
you need some sort of bypass to release the pressure. when the throttle plate closes, the pressure has nowere to go. it will fight the air being pushed up and slam back into the compressor. my understanding is that it can/will cause damage to the turbo.
02-25-2009, 07:03 PM
#4
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yes For a stick 6 speed ,Yes! For an auto,, not really. But is a nice safty feature to stop over boosting in a bad waste gate situation, espespecially when you can change the springs settings for your max PSI level. If ever a waste gate goes bad or sticks ,the BOV will open thus protecting your engine ,head gaskets ETC and is better for the turbos when you slap off the throttle because your giving all that pressurized air somewhere to go other then slamming back into the turbo or turbo's Which is hard on them !!So,My new answer is YES LOL Now, that ive thought about it !!YES,YES,YES, LOL
It also makes a really cool sound when you let off the throttle too WOOSH!!!LOL LOL!!!!
It also makes a really cool sound when you let off the throttle too WOOSH!!!LOL LOL!!!!
10-07-2009, 10:18 PM
#6
For a stick 6 speed ,Yes! For an auto,, not really. But is a nice safty feature to stop over boosting in a bad waste gate situation, espespecially when you can change the springs settings for your max PSI level. If ever a waste gate goes bad or sticks ,the BOV will open thus protecting your engine ,head gaskets ETC and is better for the turbos when you slap off the throttle because your giving all that pressurized air somewhere to go other then slamming back into the turbo or turbo's Which is hard on them !!So,My new answer is YES LOL Now, that ive thought about it !!YES,YES,YES, LOL
It also makes a really cool sound when you let off the throttle too WOOSH!!!LOL LOL!!!!
It also makes a really cool sound when you let off the throttle too WOOSH!!!LOL LOL!!!!
This is an old thread but I hate to see bad infomation left out there. A bov does not protect the engine from overboost in any way. The bov needs vacuum to open, when you are boosting it will not open. The bov spring sizes are selected according to how much vacuum your car produces not how much boost you want to run.
10-07-2009, 10:30 PM
#7
This is an old thread but I hate to see bad infomation left out there. A bov does not protect the engine from overboost in any way. The bov needs vacuum to open, when you are boosting it will not open. The bov spring sizes are selected according to how much vacuum your car produces not how much boost you want to run.
I am glad you brought this up unclebens. And you are absolutely right.
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10-07-2009, 10:39 PM
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Id like to add that i dont agree that you dont need a bov on an auto car. The point is to release boost pressure when the the throttle blade it slammed shut when you let out,right? So how is that any different on an auto then a m6?
Alex
Alex
10-07-2009, 10:44 PM
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Its not simply other than you will be slamming it shut more on an M6 more than likely.... I have one on my A4.... dont know why anyone would leave it out. (If you can afford a Turbo build, you can at least afford "some kind" of BOV!)
10-08-2009, 12:28 AM
#12
yes sir.
10-08-2009, 06:27 AM
#13
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Its very boost dependant. But a BOV is not essential. It is preferred to have one when higher levels of boost are used, and on some more fragile turbo units.
But below say 10psi as a general guide, it is definately not essential.
But below say 10psi as a general guide, it is definately not essential.
10-08-2009, 09:21 PM
#19
The purpose of a bov is to release pressure in the cold side so the air doesn't back up into the turbine resulting in compressor surge. Compressor surge causes the turbine to slam into a wall of air, think about the wheel spinning 100k rpm then down half of that then back to 100k rpm (not real numbers).
The turbo's lifespan will be shortened without the bov's relief. Another option is to run a bypass valve instead of a blow off valve. A bpv recirculates the release air back into the intake tract before the turbo to prevent the split second of running rich between shifts (basically its a much quieter bov).
The turbo's lifespan will be shortened without the bov's relief. Another option is to run a bypass valve instead of a blow off valve. A bpv recirculates the release air back into the intake tract before the turbo to prevent the split second of running rich between shifts (basically its a much quieter bov).
10-08-2009, 09:58 PM
#20
The purpose of a bov is to release pressure in the cold side so the air doesn't back up into the turbine resulting in compressor surge. Compressor surge causes the turbine to slam into a wall of air, think about the wheel spinning 100k rpm then down half of that then back to 100k rpm (not real numbers).
The turbo's lifespan will be shortened without the bov's relief. Another option is to run a bypass valve instead of a blow off valve. A bpv recirculates the release air back into the intake tract before the turbo to prevent the split second of running rich between shifts (basically its a much quieter bov).
The turbo's lifespan will be shortened without the bov's relief. Another option is to run a bypass valve instead of a blow off valve. A bpv recirculates the release air back into the intake tract before the turbo to prevent the split second of running rich between shifts (basically its a much quieter bov).