Ideal spot is actually close to the throttle body, I have mine mounted where you said yours is. It's also visible to people when they see it. Personally I hear people go with tial and it's a great bang for the buck. Great sound great value

 

Agree with Biologist, the best location in my opinion is nearest to the TB, I have mine there as well and it is great.
Secondly, you dont need more than one. Youll be fine. You were probably thinking more of wastegates, where two would be better than one in all aspects but cost.
Third, Tial vs HKS would be a very opinion based discussion, personally my car has an SSQV now, but I am going Tial Q once I get my intercooler.
I love Tial quality, value, and sound. I do not like the SSQV much or any other BOV aside from the Tial because of sound, performance wise I do not think there is much of a difference if any, maybe one has a faster response. Again its kind of like the PTE vs BW turbo discussion, no one is ever really "right".
Go with what YOU like.

 

Agree with Biologist, the best location in my opinion is nearest to the TB, I have mine there as well and it is great. Secondly, you dont need more than one. Youll be fine. You were probably thinking more of wastegates, where two would be better than one in all aspects but cost. Third, Tial vs HKS would be a very opinion based discussion, personally my car has an SSQV now, but I am going Tial Q once I get my intercooler. I love Tial quality, value, and sound. I do not like the SSQV much or any other BOV aside from the Tial because of sound, performance wise I do not think there is much of a difference if any, maybe one has a faster response. Again its kind of like the PTE vs BW turbo discussion, no one is ever really "right". Go with what YOU like.

Double BOV sounds like crap. Stick with single

 

Best location is not near the TB. It's near the turbo. Either way, it doesn't matter.

My HKS BOV works just fine with 27PSI behind it.

 

+1, that's why that stock bov on the sequential system is right after the turbos.

 

I have a big boy procharger BOV. And that sucker sounds loud as a mofo with 14psi behind it

 

You will need another BOV if you go above 650-700whp. The SSQ wasn't designed to deal with that much power.

Steve

 

I believe the latest model of the SSQV (4th gen) is made to withstand more boost then earlier models due to having 2 valves in the unit now. I could be wrong but after doin research that's what Iv come up with. I plan on adding one on my setup along with my HKS Type 2 racing bov located under the driverside headlight/brake duct area. Im going to put the new bov on the opposite side so you can see both of the bov's in both brake ducts.

 

I have my SSQV right by the TB with no complaints. Sounds great and it performs great for a street car.

 

On a bigger turbo setup I've always preferred having two BOV's in play - one on the hot side piping somewhere, and another on the cold side piping.

If you're only running one BOV, it's really a matter of preference. Some OEM setups put the bypass valves on the hotside, others do it on the cold side. Using a good BOV w/a good vacuum reference is more important than the location itself.

 

What is the explanation for mounting on the hotside or intake side? My assumption was to allow air out without it going back to the turbo and if the bov is near the turbo you would have more pressure relieved by the turbo.

On the other hand i can see that the bov is only going to lower pressure at closed throttle rather than to eliminate it altogether, therefore no matter where the bov is the job of lowering pressure will be done.

 

tial here too

mine is set up on the intake/cold side after the intercooler and it works well, but I was also thinking on putting another one on the hot side closer to the turbo.

 

here is an old ass article that i found a long time ago that is pretty informative.....

http://www.modified.com/tech/0701_sccp_compact_car_questions/

 

The article says that its better on the blow off valve to be on the cold side and that it helps to keep air moving in the same direction. It makes sense but not a deep scientific case i was expecting with pretty pictures

 

I dunno, I made 635rwhp in a 100+degree shop, and at night and in colder weather I think I made more. No problems to report with the HKS. I could probably benefited with a different valve, and have a Sard Racing valve I would switch it out with. I didn't notice much of a difference, and I'm just on the street. Maybe if races matter more and you have a larger turbo or something, but whatever.

You basically want the pressure near the turbo to be eliminated as much as possible between shifts. If the BOV is near the TB, the turbo is still trying to push air through the intercooler (restriction), and it's cool air anyway.

It's not going to make or break anybody's dreams unless it's a fine margin.

 

I dunno, I made 635rwhp in a 100+degree shop, and at night and in colder weather I think I made more. No problems to report with the HKS. I could probably benefited with a different valve, and have a Sard Racing valve I would switch it out with. I didn't notice much of a difference, and I'm just on the street. Maybe if races matter more and you have a larger turbo or something, but whatever.

You basically want the pressure near the turbo to be eliminated as much as possible between shifts. If the BOV is near the TB, the turbo is still trying to push air through the intercooler, and it's cool air anyway.

Same here. I've used all HKS bov's from the original to SSQV 4 & also the racing bov. I've had nothing but positive experiences.

 

After this thread im going to stick with the bov setup I have. I have a lit of tweaking to do to go for more power anyway.

 

Had the hks ssqv as well with no issues with single set up. (mounted on the driver side)

 

^^I have my SSQV in the same spot, but I'm on the stock twins.

 

I ran mine with stock twins/ecu as well as hks 264 cams and once in a while it would stall out when coming to stop due to meter air venting through the blow off valve.

 

i am running a top fuel zero 1000 bov I have mine by the tb as well sounds like a missle screaming outta a tigers ass at 15psi and can hold up to 700 hp

 

I have a HKS racing type II for sale if you're interested

 

I don't think it really matters THAT much, but I'd say it makes more sense to put it near the TB, since the closing of the throttle body results in a backward "wave" of pressure. I think you could argue that either way is best, so my plan is to run two, especially since I'll be running upwards of 35-40 psi.

 

basically, when you let off the throttle, the throttle plate closes and air coming out of the turbo travels through the intercooler piping as normal but then bounces off the throttle plate and gets sent back towards the turbo. location of BOV should theoretically be a secondary consideration after "will all the backfilling air escape through the BOV before it reaches the turbo?" after which you will be noting compressor surge if it does not.

when you are boosting, the BOV is being forced closed; when you let off the throttle, the valve is allowed to open up and by the law of pressure gradient, air will travel to an area of higher pressure to lower pressure (ie: outside the intercooler piping through the BOV).

if your BOV is a pile of landfill runoff, it will not be up to the task and you will experience some compressor surge or otherwise alternate scenarios involving the BOV itself.

 

Thanks for the feed back and good points made above.

 

Two Blitz Dual-Drive BOVs, with stiffest springs, as close to VeilSide 100 mm throttle body (1100 whp motor) as reasonably possible:

Ken.

 

Procharger big red

took off my cold side IC piping that will be getting polished

 

On my car I have the TIAL BOV and it is mounted fairly close to the TB...and to me this makes the most sense as once you let off the gas pedal the TB closes and that is the first place that air stops moving forward and has to move backwards....So in theory you want it to be able to release at the closest point so having the BOV as close to it as you can allows that air to escape very quickly...However my buddy has the same BOV mounted on his hot side pipe right before his intercooler and it works just fine as well. I have a 76mm turbo on my car and he has an 88mm on his... As far as brand I am TIAL all the way man..best quality and sound you can ask for.

 

I've always loved my Turbonetics Raptor BOV, which will be replacing my SSQ soon hopefully I ran it on my Mustang for a while.
I would switch over to a piston style (pretty much anything other than the HKS SSQ style) since they vent more air if you are worried. I doubt you would need 2, but it’s all up to the person. If it lets ya sleep at night then add another one. Not going to hurt at least.
If you really want to vent some air you can always get a Mad Dog 104.
http://racepartsolutions.com/index.php/categories1/561-375-6277/blow-off-valves/mad-dog-104mm-blow-off-valve-md-104-pn-528104-jod-race-part-solutions

 

dafuq.

That's pure awesome.

 

Can't go wrong with Tial

 

Engineers @ Borg Warner knew what they were doing when they put a BOV on the turbo... So did Toyota near their turbos, etc...

We're splitting hairs in this thread, lol.

 

You're neglecting the fact that both of those "technologies" are using recirculated BOVs. Toyota does it because they use a MAF system, which needs recirculation. Borg Warner does it to make consolidate all components of a turbo system into a single unit (namely turbo, BOV, and waste gate).

I'd say you could argue either way. You could argue that placing the BOV near the turbo would allow you to keep more boost built between gears for drag racing, and placing it closer to the TB would place less stress on the turbo if you don't care about boost between gears.