how much psi on turbo dose frs need a bov - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Visitor.S · 07-23-2016, 09:01 PM

anyone knows how much psi on turbo dose frs need a bov?

since greddy turbo didnt come with a bov, i do some search that seems like under 300whp will not need for a bov but every over 400 have a bov,

anyone know how much psi should add a bov? thanks

kev60625 · 07-24-2016, 01:58 AM

I'm not really knowledgeable on this to be certain, but I'm pretty sure you can put a bov on any turbo...I'm guessing it comes with a bpv?

You should do some research..

I used to own a wrx and know stis/wrx's don't come with BOV, but bpv's. You can put a bov on any of them though, but from what I read, it wouldn't be the most ideal setup..

guybo · 07-24-2016, 07:10 AM

The only difference between a BOV and BPV is that a BOV (Blow Off Valve) bents to atmosphere whereas a BPV (By Pass Valve) vents to a recirc tube back into the intake. My GenCoupe came with a BPV but I deleted the recirc tube because it recirc'ed hot air (and I like the sound of a BOV).

Even a first gen GenCoupe 2.0T comes with a BPV even though it only makes something like 240 HP. A BOV/BPV protects the engine and turbo from getting damaged, it is needed on all turboed cars. The wastegate prevents further boost from being made, but it does nothing for boost that is already present when you go off-throttle. That's what the BOV/BPV does.

FX86 · 07-25-2016, 10:33 AM

5ml dose should work fine

mav1178 · 07-25-2016, 10:35 AM

How much PSI?

Theoretically any boosted engine should have some type of blowoff/bypass mechanism. It's there to prevent compressor surge, and really meant to protect the turbo.

If you retain the stock MAFS and have a BOV setup venting to the atmosphere, you need to make sure you have the proper tune to compensate for it, otherwise you may stall between shifts or have really poor throttle response due to rich mixture.

-alex

scmil95eg · 07-25-2016, 11:20 AM

Quote:

Originally Posted by mav1178

Theoretically any boosted engine should have some type of blowoff/bypass mechanism. It's there to prevent compressor surge, and really meant to protect the turbo.

Correct. In addition, it helps keep the turbo spooled between shifts by relieving the pressure on the compressor side.

If you're new to turbos, you absolutely need a wastegate, can't run without one. You can run without a BOV but you'll increase wear on your CHRA exponentially. Especially journal type CHRAs.

07-23-2016, 09:01 PM	#1
Visitor.S Member Join Date: Mar 2016 Drives: Frs Location: CA Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	how much psi on turbo dose frs need a bov anyone knows how much psi on turbo dose frs need a bov? since greddy turbo didnt come with a bov, i do some search that seems like under 300whp will not need for a bov but every over 400 have a bov, anyone know how much psi should add a bov? thanks

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07-24-2016, 01:58 AM	#2
kev60625 Senior Member Join Date: Sep 2015 Drives: 2013 WRB Subaru BRZ Location: Chicago Posts: 220 Thanks: 41 Thanked 45 Times in 33 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I'm not really knowledgeable on this to be certain, but I'm pretty sure you can put a bov on any turbo...I'm guessing it comes with a bpv? You should do some research.. I used to own a wrx and know stis/wrx's don't come with BOV, but bpv's. You can put a bov on any of them though, but from what I read, it wouldn't be the most ideal setup..

07-24-2016, 07:10 AM	#3
guybo Huge E85 fan! Join Date: May 2016 Drives: 2016 Scion FRS Location: Tampa, FL, USA Posts: 1,850 Thanks: 539 Thanked 1,010 Times in 605 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	The only difference between a BOV and BPV is that a BOV (Blow Off Valve) bents to atmosphere whereas a BPV (By Pass Valve) vents to a recirc tube back into the intake. My GenCoupe came with a BPV but I deleted the recirc tube because it recirc'ed hot air (and I like the sound of a BOV). Even a first gen GenCoupe 2.0T comes with a BPV even though it only makes something like 240 HP. A BOV/BPV protects the engine and turbo from getting damaged, it is needed on all turboed cars. The wastegate prevents further boost from being made, but it does nothing for boost that is already present when you go off-throttle. That's what the BOV/BPV does.

07-25-2016, 10:33 AM	#4
FX86 Banned Join Date: May 2016 Drives: on the wrongside of the road Location: rear floor mats Posts: 2,240 Thanks: 1,084 Thanked 2,087 Times in 1,015 Posts Mentioned: 14 Post(s) Tagged: 1 Thread(s)	5ml dose should work fine

07-25-2016, 10:35 AM	#5
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,093 Times in 3,029 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	How much PSI? Theoretically any boosted engine should have some type of blowoff/bypass mechanism. It's there to prevent compressor surge, and really meant to protect the turbo. If you retain the stock MAFS and have a BOV setup venting to the atmosphere, you need to make sure you have the proper tune to compensate for it, otherwise you may stall between shifts or have really poor throttle response due to rich mixture. -alex

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