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Discussion Starter · #1 ·
Hey everyone,

With this being my first turbo, here's the newbie question.... Why, other than the cool sound lol, should I get a BOV? Also, recommendations?

edit: Stupid delayed keyboard response.. POINT not PONIT! LOL!
 

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No.

Recirc valve > BOV.
 
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BESIDES whoosh AND psHH noise nothing to it
 

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A BPV is functionally superior to an atmospheric BOV in just about any application. The BOV is just for show (full disclosure, I adore the sound of a BOV..but I have no intention of converting my Cruze).
 

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Every time you hear the intake roar it can remind you of the sucking sound your wallet made when the purchass took place.

Won't help the car a bit.....kinda cool to look at....beyond that.....ehe.

Rob
 

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Every time you hear the intake roar it can remind you of the sucking sound your wallet made when the purchass took place.

Won't help the car a bit.....kinda cool to look at....beyond that.....ehe.

Rob
If you're hearing the intake roar through the BOV, then you are having some issues...hehe
 

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So basically the consensus is, if I wanna hear the woooosh, get one, if not, spend the money somewhere else! Gotcha! Thanks guys! LOL!
Correct, installing one of the Forge BOVs will not give you any extra power. Just for sound and looks, in less you go larger turbo that does not have the BOV built into the turbo like our stock turbos. Then modification is required for external BOV and MAF relocation.
 

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I'm quite sure the 1.4L's turbo does not have a blow off valve from the factory.
 

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I'm quite sure the 1.4L's turbo does not have a blow off valve from the factory.
Yeah I think you're right. At least not an atmospheric bov
 

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BOV, BPV, Bypass Valve on turbocharger system all the samething. Yes, I completely understand that the factory BOV, BPV, Bypass Valve(whichever you want to call it) is designed into the turbocharger and releases its pressure back into the intake side of the turbocharger. And Forge offers two style BOV/BPV for our cars that bolt directly in replacement of the factory BOV/BPV. One being the same design as our factory one that releases pressure back into intake side of turbo, and the other releases pressure to atmosphere. Both are bolted on the factory turbocharger. And I was just stating that if you were to go with a larger turbocharger than the stock one, that does not have a built in BOV/BPV then you will have to install a external BOV that can be either vented back into intake before turbo(after MAF) or vented to atmosphere(which at that point for proper tuning and driveability then MAF will need to be relocated into the charge pipe between intercooler outlet and throttle body). And just wanted to state that it is not worth it to do. A lot of work for no gain. Other than maybe looks and sound.
 

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Discussion Starter · #15 ·
Yeah.. ok ... I understand now! LOL! so basically, there's no point to making my car go wooosh! LOL! :p

thanks Mark!
 

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The point has been made already, but I'll share my experience (which you can also find by searching around). You can't use a BOV without a tune and there are 3 important things that you should know

1. The car runs like crap. at least mine did even after a bunch of tweaks from trifecta. But, the car did run stronger at WOT.
2. It's so sensitive that it goes off at the slightest let off of the throttle so everyone either looks at you like you're an a$$ or they think you're trying to race
3. The noise sounds like a bus's air brakes and does not sound cool. No chirp, just a puff of air.

However, if you want a worthy mod, replace the stock BPV with a better BPV (no tune required). This will be especially helpful if you plan to get tuned.
 
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Yep the Forge valves are designed to be adjustable with different springs without removing entire valve. They are also a better quality valve than are factory plastic and are suppose to hold pressure better too, no leaky. Recommended using with a tune with higher boost levels.
 
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The point has been made already, but I'll share my experience (which you can also find by searching around). You can't use a BOV without a tune and there are 3 important things that you should know

1. The car runs like crap. at least mine did even after a bunch of tweaks from trifecta. But, the car did run stronger at WOT.
2. It's so sensitive that it goes off at the slightest let off of the throttle so everyone either looks at you like you're an a$$ or they think you're trying to race
3. The noise sounds like a bus's air brakes and does not sound cool. No chirp, just a puff of air.

However, if you want a worthy mod, replace the stock BPV with a better BPV (no tune required). This will be especially helpful if you plan to get tuned.
On my Supra, the only reason I upgraded the BOV was because of the significantly higher boost pressure. Needed a stronger BOV to handle the boost when the throttle slams shut. I have the HKS one and you can tune the sound with different inserts. Being that the Supra is a big inline 6cyl you have to be really on it to make the BOV chirp. Couldn't see adding a BOV to my Cruze unless I was running a much higher boost pressure.
 

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On my Supra, the only reason I upgraded the BOV was because of the significantly higher boost pressure. Needed a stronger BOV to handle the boost when the throttle slams shut. I have the HKS one and you can tune the sound with different inserts. Being that the Supra is a big inline 6cyl you have to be really on it to make the BOV chirp. Couldn't see adding a BOV to my Cruze unless I was running a much higher boost pressure.
If you're still running the stock twins, it doesn't take much at all to make the BOV release. Heck, I was running a single (PT-57) and mine would "flutter" at the lowest of RPMS/throttles. Didn't take much at all to get to 0+ PSI.
 

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If you're still running the stock twins, it doesn't take much at all to make the BOV release. Heck, I was running a single (PT-57) and mine would "flutter" at the lowest of RPMS/throttles. Didn't take much at all to get to 0+ PSI.
Goo

I have a '92 Supra, so I have the 7mgte motor single turbo. I do have 57 trim ct26 turbo upgrade. I have to be really aggressive with the throttle to make the BOV chirp.
 
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