When is a BOV needed?
03-23-2005, 08:18 PM
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When is a BOV needed? Is it safe to say that the STS kits come with a blow off valve? Does it matter if a car is an auto or a 6 speed when using a bov? Does a bov play a different role with an intercooler as opposed to a setup without an intercooler?
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03-23-2005, 08:26 PM
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It does matter if the car is A4 or M6, what happens is when your throttle blade closes under full boost the pressure pushes back on the compressor turbine and causes the turbo to go from a super high rpm (say 50k) down to 0 or less, this puts additional wear on the turbo.
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
03-23-2005, 08:27 PM
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On an auto with low boost it is not really needed. On a 6-spd I'd probably get one even at low boost because you are lifting off the gas and therefore closing the TB blade during each shift.
On high boost situations I would use a BOV no matter what. It's just insurance AND can mean the difference bewteen winning and losing a street race.
On high boost situations I would use a BOV no matter what. It's just insurance AND can mean the difference bewteen winning and losing a street race.
03-23-2005, 09:23 PM
#4
Originally Posted by Boostaholic
It does matter if the car is A4 or M6, what happens is when your throttle blade closes under full boost the pressure pushes back on the compressor turbine and causes the turbo to go from a super high rpm (say 50k) down to 0 or less, this puts additional wear on the turbo.
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
03-25-2005, 03:56 PM
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Originally Posted by Boostaholic
It does matter if the car is A4 or M6, what happens is when your throttle blade closes under full boost the pressure pushes back on the compressor turbine and causes the turbo to go from a super high rpm (say 50k) down to 0 or less, this puts additional wear on the turbo.
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
So the blowoff valve opens when there is a pressure difference between the intake manifold pressure and the intake pipe pressure before the tb and it opens the valve, bleeding off the pressure so the turbo doesn't get back spun.
Does that make sense?
