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      06-18-2012, 11:46 PM   #1
lightning
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Tial bov questions

Hi guys,

Anyone on tial bov? I have one and sometimes at high rpm, say around 6k rpm, it doesn't blow off. Is it normal? Or is there something wrong w mine? Sometimes under high load it blows off twice.
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      06-19-2012, 05:53 AM   #2
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I have one and it works fine and blows off at most times during high load (or low ).
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      06-19-2012, 07:25 AM   #3
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Quote:
Originally Posted by lightning
Hi guys,

Anyone on tial bov? I have one and sometimes at high rpm, say around 6k rpm, it doesn't blow off. Is it normal? Or is there something wrong w mine? Sometimes under high load it blows off twice.
I had the same problem with my synapse bov during high rev! is it normal?
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      06-19-2012, 07:39 AM   #4
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hell no that not normal.
have tial as well and it releases that pressure every time.
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      06-19-2012, 09:25 AM   #5
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Quote:
Originally Posted by romak47 View Post
hell no that not normal.
have tial as well and it releases that pressure every time.



Do u rev till 6-7k rpm? It doesn't blow off.. Maybe it's cause boost get tapered at higher rpm?
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      06-19-2012, 06:50 PM   #6
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Quote:
Originally Posted by lightning View Post
Hi guys,

Anyone on tial bov? I have one and sometimes at high rpm, say around 6k rpm, it doesn't blow off. Is it normal? Or is there something wrong w mine? Sometimes under high load it blows off twice.

My HKS SSQV does the same exact thing.

So the Tial does it, Synapsis, and HKS. Sounds like it is how the engine works under high RPM while shifting. Like it holds the boost pressure on purpose?
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      06-20-2012, 03:33 AM   #7
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Quote:
Originally Posted by lightning View Post
Do u rev till 6-7k rpm? It doesn't blow off.. Maybe it's cause boost get tapered at higher rpm?
i have revved it that high yes.
Excess boost is released just as if i revved to 3 grand uner a load..

I assume you are actually under a load while revving it that high?
Check to make sure your lines are kink free and the bov is unabstructed
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      06-23-2012, 12:09 PM   #8
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Quote:
Originally Posted by romak47 View Post
i have revved it that high yes.
Excess boost is released just as if i revved to 3 grand uner a load..

I assume you are actually under a load while revving it that high?
Check to make sure your lines are kink free and the bov is unabstructed


Anyone else w this observation?
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      06-27-2012, 03:17 PM   #9
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Hi guys, fred from Evolution racewerks was v kind to let me understand how the bov works and explained the observation as discussed earlier..

"The job of the BOV is to release boost pressure from the turbocharger. *When the throttle plate in the throttle body closes (when you lift the gas pedal), the turbocharger is still spinning and pushing pressure. *This pressure hits the closed throttle plate and the pressure has to go somewhere (because the turbocharger is still spinning). *Thus, that's why a diverter valve or BOV is required on a turbocharged car. *It's job is to release pressure when the throttle plate closes. *When you shift at WOT and change gears, you're usually shifting very quickly. *Thus, you either don't lift the gas pedal or you lift very quickly. *Because of this, the throttle plate either doesn't close during shifts or it closes and then opens so quickly that the BOV does not need to open. *That is why you do not hear the valve when you're drag racing."
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