Tantwoforty
03-26-2011, 02:45 AM
Hello people. im doing a KA-T build and im about at that point where im looking into blow off valves.
i have done a bit of looking around and i noticed zilvia hasn't had a bov thread in a long time, and the ones i did find were not very informative.
so i thought we could compile some information and options and experiences so people would have a information base to use to help decide witch blow off valve is the best choice for them.
For my specific set up, i want to run atmospheric blow off. i would like to mount the bov in such a place where reserc would be possible in the future when the coolness of my first turbo car sounding cool wares off, call me lame... i dont give a damn.
Moving on, im open to anyone giving me more to add to this main post, so please feel free to have me add things.
What i would like is for you to post what bov your using now, how you feel about it, dose it leak? dose it flutter? dose it cause surging? how dose ti sound? is it too loud? too quite?
What other bov's have you used or do you have experience with?
What bov would you recommend?
How is your throttle response?
Are you getting any lag from it, dose it open slow and allow a bit of flutter?
Are you stalling or feeling bog on deceleration?
list your engine, turbo, bov, bov location, reserc, recerc location, charge pipe diameter, tune.. and anything else that you think we should know.
Picking the right bov is very important, venting too much air is bad, venting it too late is bad. to soon is bad. too little is bad, too long is bad, too short is bad.. the bov can cause lots of problems aswell, boost leaks, loss in power, stalling ect..
There are videos on you tube of people installing bov's and gaining 25+hp/tq
Here are some of the top BOV's i see today...
Synapse Synchronic Blow Off Valve Pull Type $209.95
http://www.importfabrication.com/images/Synapse%20bov.jpg
http://www.synapseengineering.com/archive/marketing/forums/synchronicbov/SB001section2.jpg
From Frsport.com
"Synapse SB001 Blow Off Valve is a quick acting pull-type relief valve. The patented design uses a multi-tier piston actuator that self centers under pressure and seal tightly as boost increases. This design was created to greatly reduce or prevent compressor surge and boost leak at critical moments. This BOV is universal and can be fitted in many vehicle applications by utilizing different weld-on flanges. Synapse offers a variety of flanges to adapt into your vehicle when you already have a BOV flange welded such as Greddy Type R/S/RS, HKS Racing, HKS Racing Type II, HKS SSQV, Tial 50mm, Mitsubishi flange, and VW / Audi."
HKS Super Sequential Blow Off Valve SSQV3 -$229.95
http://www.velocityfactor.net/prodimages/HKS-SSQV3-banner.jpg
http://www.aqmotorsports.com/images/ssqv3_diagram.jpg
From Frsport.com
"HKS new generation super sequential blow-off valve is here, dubbed The Super SQV 3. This blow off valve features nickel-plated, die-cast metal secondary valve, which is swaged to the primary valve. A stainless steel C-Clip is used for increase sealing and durability. The new design incorporates a holographic HKS logo on the back of the valve along with HKS logos cast onto the body structure for authenticity. Don't be fooled with the fake ones floating around on the internet. FRSport only carries authentic parts straight from the manufacturer.
The Super SQV 3 utilizes the same mounting flanges as previous generation SSQV's to assure compatibililty with all HKS SSQV optional hardware, including recirculation fittings and recirculation kits. Replacing your old SSQV has never been easier! This blow-off valve is sure to wow people eye's when shown during meets or even at the race track. It performs well and looks sexy in your engine bay!"
Tial Sport Q BOV Blow Off $254.95
http://www.streettunedmotorsports.com/parts/b/tial_q_r_bov2.jpg
http://www.tialmedia.com/Exploded/Q%20and%20QR.jpg
From Frsport.com
"Tial Sport's new Q Blow Off Valve is a newer version of the original 50mm BOV. Featuring an improved design through countless hours of R&D, Tial was able to increase 60% more flow than the original design. This is now believed to be the highest flowing on the market. Made from 6061 aluminum alloy with a 50.5mm valve and V-band clamp mounting, this new version just got better.
Springs available:
Pink -11 PSI (-22 in/HG)
Un-painted -10 PSI (-20 in/HG)
White -8 PSI (-16 in/HG)
Black -6 PSI (-12 in/HG)"
Greddy Type RZ Limited Edition Blow Off Valve $237.95 ( this is a SE of the type RS but the RS diddnt have a price)
http://www.kingz32parts.com/images/greddy%20bov.jpg
http://www.hachiroku.com.au/blog/wp-content/uploads/2009/02/greddy-blow_off_valve_-_type_rs.jpg
From Frsport.com
"The Greddy Type RZ is based off Greddy's popular Type-RS valve with a stealthier, black/gunmetal look. The Type-RZ has adjustable dual springs, excellent valve to diaphram ratio, and the ability to blow off to atmosphere or re-routed back into the intake via a recirculation fitting. Recommended for 100-400HP range."
From the RS
" was made to be the most reliable blow off valve system available to the market. This Blow Off Valve has a new style featuring great response with a big 40mm valve diameter for maximum flow. The Type-RS blow off valve is CNC machined to have 8 discharge ports that draw in the surrounding air to amplify the blow-off sound. "
Thats most of the major name brand choices there are. there are variations of these bov's in slight model changes ect.
there are also knock offs of all of these except the synapse.
If you are running a knock off ebay one, post up here. tell us how its working and tell us the story. were all so scared to use ebay stuff, and in my time with a hks knockoff it was all bad, but its still nice to have some feedback on things.
Of if you run no bov, tell us about your turbo and your throttle response.. have you killed a turbo? have you checked for more shaft play?
Hopefully we can get a good amount of people to post here and eventually we will have most available bov's written up here in one easy place.
Please keep the thread clean dont post useless crap, take it to pm please :)
annnd go..
i have done a bit of looking around and i noticed zilvia hasn't had a bov thread in a long time, and the ones i did find were not very informative.
so i thought we could compile some information and options and experiences so people would have a information base to use to help decide witch blow off valve is the best choice for them.
For my specific set up, i want to run atmospheric blow off. i would like to mount the bov in such a place where reserc would be possible in the future when the coolness of my first turbo car sounding cool wares off, call me lame... i dont give a damn.
Moving on, im open to anyone giving me more to add to this main post, so please feel free to have me add things.
What i would like is for you to post what bov your using now, how you feel about it, dose it leak? dose it flutter? dose it cause surging? how dose ti sound? is it too loud? too quite?
What other bov's have you used or do you have experience with?
What bov would you recommend?
How is your throttle response?
Are you getting any lag from it, dose it open slow and allow a bit of flutter?
Are you stalling or feeling bog on deceleration?
list your engine, turbo, bov, bov location, reserc, recerc location, charge pipe diameter, tune.. and anything else that you think we should know.
Picking the right bov is very important, venting too much air is bad, venting it too late is bad. to soon is bad. too little is bad, too long is bad, too short is bad.. the bov can cause lots of problems aswell, boost leaks, loss in power, stalling ect..
There are videos on you tube of people installing bov's and gaining 25+hp/tq
Here are some of the top BOV's i see today...
Synapse Synchronic Blow Off Valve Pull Type $209.95
http://www.importfabrication.com/images/Synapse%20bov.jpg
http://www.synapseengineering.com/archive/marketing/forums/synchronicbov/SB001section2.jpg
From Frsport.com
"Synapse SB001 Blow Off Valve is a quick acting pull-type relief valve. The patented design uses a multi-tier piston actuator that self centers under pressure and seal tightly as boost increases. This design was created to greatly reduce or prevent compressor surge and boost leak at critical moments. This BOV is universal and can be fitted in many vehicle applications by utilizing different weld-on flanges. Synapse offers a variety of flanges to adapt into your vehicle when you already have a BOV flange welded such as Greddy Type R/S/RS, HKS Racing, HKS Racing Type II, HKS SSQV, Tial 50mm, Mitsubishi flange, and VW / Audi."
HKS Super Sequential Blow Off Valve SSQV3 -$229.95
http://www.velocityfactor.net/prodimages/HKS-SSQV3-banner.jpg
http://www.aqmotorsports.com/images/ssqv3_diagram.jpg
From Frsport.com
"HKS new generation super sequential blow-off valve is here, dubbed The Super SQV 3. This blow off valve features nickel-plated, die-cast metal secondary valve, which is swaged to the primary valve. A stainless steel C-Clip is used for increase sealing and durability. The new design incorporates a holographic HKS logo on the back of the valve along with HKS logos cast onto the body structure for authenticity. Don't be fooled with the fake ones floating around on the internet. FRSport only carries authentic parts straight from the manufacturer.
The Super SQV 3 utilizes the same mounting flanges as previous generation SSQV's to assure compatibililty with all HKS SSQV optional hardware, including recirculation fittings and recirculation kits. Replacing your old SSQV has never been easier! This blow-off valve is sure to wow people eye's when shown during meets or even at the race track. It performs well and looks sexy in your engine bay!"
Tial Sport Q BOV Blow Off $254.95
http://www.streettunedmotorsports.com/parts/b/tial_q_r_bov2.jpg
http://www.tialmedia.com/Exploded/Q%20and%20QR.jpg
From Frsport.com
"Tial Sport's new Q Blow Off Valve is a newer version of the original 50mm BOV. Featuring an improved design through countless hours of R&D, Tial was able to increase 60% more flow than the original design. This is now believed to be the highest flowing on the market. Made from 6061 aluminum alloy with a 50.5mm valve and V-band clamp mounting, this new version just got better.
Springs available:
Pink -11 PSI (-22 in/HG)
Un-painted -10 PSI (-20 in/HG)
White -8 PSI (-16 in/HG)
Black -6 PSI (-12 in/HG)"
Greddy Type RZ Limited Edition Blow Off Valve $237.95 ( this is a SE of the type RS but the RS diddnt have a price)
http://www.kingz32parts.com/images/greddy%20bov.jpg
http://www.hachiroku.com.au/blog/wp-content/uploads/2009/02/greddy-blow_off_valve_-_type_rs.jpg
From Frsport.com
"The Greddy Type RZ is based off Greddy's popular Type-RS valve with a stealthier, black/gunmetal look. The Type-RZ has adjustable dual springs, excellent valve to diaphram ratio, and the ability to blow off to atmosphere or re-routed back into the intake via a recirculation fitting. Recommended for 100-400HP range."
From the RS
" was made to be the most reliable blow off valve system available to the market. This Blow Off Valve has a new style featuring great response with a big 40mm valve diameter for maximum flow. The Type-RS blow off valve is CNC machined to have 8 discharge ports that draw in the surrounding air to amplify the blow-off sound. "
Thats most of the major name brand choices there are. there are variations of these bov's in slight model changes ect.
there are also knock offs of all of these except the synapse.
If you are running a knock off ebay one, post up here. tell us how its working and tell us the story. were all so scared to use ebay stuff, and in my time with a hks knockoff it was all bad, but its still nice to have some feedback on things.
Of if you run no bov, tell us about your turbo and your throttle response.. have you killed a turbo? have you checked for more shaft play?
Hopefully we can get a good amount of people to post here and eventually we will have most available bov's written up here in one easy place.
Please keep the thread clean dont post useless crap, take it to pm please :)
annnd go..