Best type of BOV?

[Prime85]

What benifits do you get from a BOV that vents into the atmosphere instead of back into the turbo? Is it only a cool sound or is one better then the other. I have a stock BOV and Intercooler and am thinking about upgrading it.

Which type should i get?

Thank you

 

[cheap90gsx]

The cool sound is the only benefit.

 

[hdoerr]

How much boost are you running? If under 20psi then get a 1G BOV

 

[knochgoon24]

You must have the proper setup to vent your BOV without problems. But, with the proper setup, venting the BOV reduces turbulence in the intake and can relieve boost pressure from the IC piping faster (less restriction).

You really don't need those 2 benefits until your start pushing some big numbers.

For the average DSM, venting makes it easier to place the BOV in a custom setup, since it no longer has to connect back into the intake. But you do need the proper setup (MAF-T equivalent).

The MAF-T is a combination of a GM MAF with a translator that changes the output from the GM sensor to one our cars can use. When placed after the BOV in the intercooler piping, it allows the user to vent without the stumbling problems an improper setup has.

 

[zhjiln]

venting itself does not gain anything but noise....

 

[jrohner]

The whole point of an aftermarket BOV is the ricer sound.

 

[audiomaster]

You must have the proper setup to vent your BOV without problems. But, with the proper setup, venting the BOV reduces turbulence in the intake and can relieve boost pressure from the IC piping faster (less restriction).

You really don't need those 2 benefits until your start pushing some big numbers.

+1 there is a case for recirc turbulence. What this will do is slow the turbos ability to spool between shifts. Whether or not this is going to be a deal for you depends entirely on what your goals are. If you are going to continue building your car for more boost/fuel/hp then it would make sense for you to do the mods and get a BOV that dumps to atmosphere.

While I don't understand why the sound of a BOV in a high boost car is considered "ricer" some don't like the sound, some do. What's "ricer" are the weed eater sounding exaughsts on every single stinking honda you ever see. I personally don't mind and actually prefer the sound. There are several different kinds of BOVs out there I personally have a Tial on my GSX but have had an HKS SSQV and a greddy on other cars.

I recommend you think hard about what mods to do and in what order.

Good Luck.

 

[1timehondalover]

Unless you are running speed density or a GM MAF in blow through the best BOV for you is any that has recirculation provisions. There are no real performance benefits to venting.

 

[rich3389]

The best BOV is a stock 1g bov with a stop leak kit.

 

[red97gsx]

Why don't you give us some more details. What is done to your car, what are your goals and what direction are you looking to head with your car? Keep in mind with DSM's, they can be very addicting and your goals and needs may change fast. Give us a little more info and we will be able to steer you in the proper direction.

 

[viperbenz1]

greddy type s , best sound

 

[dsmeclipsex]

Ive run a few different types.

1) HKS Super Sequential - Fluttering sound, never leaked boost on my SR20det at 20psi.

2) Greddy Type RS - Ran that one on my RB20. Pretty much the same as the Greddy Type S.

3) Greddy Type S - Ran that on my 2g gst, sr20det 240, and now my TSI awd. Pretty much my favorite out of the 3. Adjustable spring and recirc option. You can basically adjust the sound it makes. Just takes a little time adjusting. Basically quarter turn, close hood, drive it, repeat until you have the setting you want. Definetly sounds better when running more than stock boost =P

Granted, i like the straight Whooooosh sound the 1g bov made before i get the greddy s.

Look around on the internet for some sounds clips. Ill see if i cant drag up a link or two.

If you want a REALLY crazy BOV that makes some awesome sounds, check out the SARD R2D2.

 

[dsmeclipsex]

Blow off valve BOV sound and information website

Theres a whole bunch for you.

 

[audiomaster]

There are no real performance benefits to venting.

I think that lowering turbulence is a real benefit. A quick search about turbulence and its effect on turbodynamics will reveal there are legitimate benefits (almost exclusively in high boost scenarios). In supercharged (direct drive applications) pre impeller high boost release can cause impeller damage. In our case turbos are free spinning and can't really be damaged but can lose a significant amount of turbine velocity. I would submit that if you are trying to keep your impeller speed as high as possible during shifts and had an adequate tune to take advantage of this situation then venting to the atmosphere would make sense.

I'd be interested to see if anyone has actually done comparative runs with a recirc vs atmosphere dump. On my subaru I ran a BOV that recird'd and vented atmosphere I switched because with a full recirc once I got into higher boost I'd experience some "bucking" when coming off WOT, partial atmospheric vent immediately remedied the problem.

I don't think this topic is an easy this is better than that as so much more about the build matters. 1G BOVs work well up to substantial boost.

 

[dsmfa9nutter]

A stock 1g bov is good to about 18psi before it starts leaking boost. If you want a bov that will hold more than that, you'll have to do the crush mod which is good for a couple more psi or go aftermarket.

 

[Prime85]

The Greddy type S does make a nice sound, i am still using the stock turbo. I guess if it doesnt have too much of a benifit i will wait till i can can purchase the full Intercooler set.

Thank you for your help

 

[knochgoon24]

The HKS SSQV flutter is driving me nuts. I'm probably going to go with a 1g and sell the SSQV because I hate the sound. With an automatic and the t-25, any time I even step on the gas, I start building boost, then I get the flutter sound.

A BOV making noise while driving around a parking lot. A little too rice for me.

 

[TomcTSI]

I would say go with the modded Greddy Type R
YouTube - Turkey Call Blow Off Valve

 

[1timehondalover]

I think that lowering turbulence is a real benefit. A quick search about turbulence and its effect on turbodynamics will reveal there are legitimate benefits (almost exclusively in high boost scenarios). In supercharged (direct drive applications) pre impeller high boost release can cause impeller damage. In our case turbos are free spinning and can't really be damaged but can lose a significant amount of turbine velocity. I would submit that if you are trying to keep your impeller speed as high as possible during shifts and had an adequate tune to take advantage of this situation then venting to the atmosphere would make sense.

I'd be interested to see if anyone has actually done comparative runs with a recirc vs atmosphere dump. On my subaru I ran a BOV that recird'd and vented atmosphere I switched because with a full recirc once I got into higher boost I'd experience some "bucking" when coming off WOT, partial atmospheric vent immediately remedied the problem.

I don't think this topic is an easy this is better than that as so much more about the build matters. 1G BOVs work well up to substantial boost.

I've read before (I couldn't tell you where) that recirculating improves boost recovery between shifts. I'm sure it doesn't apply to all setups or airflow levels, but I could see there being some potential for it since the turbo inlet is being force fed a burst of air. So long as pressure in the intake pipe is lower than ambient pressure (due to compressor suction) then the vented air from the charge pipes should be directed towards the compressor.

 

[audiomaster]

The HKS SSQV flutter is driving me nuts. I'm probably going to go with a 1g and sell the SSQV because I hate the sound. With an automatic and the t-25, any time I even step on the gas, I start building boost, then I get the flutter sound.

A BOV making noise while driving around a parking lot. A little too rice for me.

You need to adjust it. It shouldn't flutter, I think that the flutter is because its not opening all the way at low boost. You may need to T into your wastegate hose and attach it to the second port on your SSQV so at low boost it opens all the way and doesn't flutter. Otherwise you may have compressor surge.

 

[AndrewD5418]

The HKS SSQV flutter is driving me nuts. I'm probably going to go with a 1g and sell the SSQV because I hate the sound. With an automatic and the t-25, any time I even step on the gas, I start building boost, then I get the flutter sound.

A BOV making noise while driving around a parking lot. A little too rice for me.

Purple insert!

 

[Dert]

I have a greddy type rs on my 97 gst, only mods are bov, apexi cold air intake, and bcs restrictor removed and gauges. I have my bov vented to atmosphere with no idle/drive problems at all, and like the type s has an adjustable screw on top to adjust how tight you want the spring. hks and both greddy's are good it comes down to sound, the type rs has a "woosh" and the hks/greddy type s have been described as a "mouse fart" I like all 3 so any of them are a good choice

 

[SmalltownDSMer]

greddy type s , best sound

+1. the type S has the best sound IMO, but it will be difficult to find if your on a budget. Greddy stopped making them and came out with the RS in it's place.

 

[Killa_dsm]

+1. the type S has the best sound IMO, but it will be difficult to find if your on a budget. Greddy stopped making them and came out with the RS in it's place.

The Greddy Type-S sounds cool but I would not recommend it to anyone wanting to run high boost. I use one and it starts blowing open around 24-25psi . Not a very good bov if you ask me. If you need to recirculate I would say run a 1g bov, and if you can vent properly run a tial.

 

[knochgoon24]

You need to adjust it. It shouldn't flutter, I think that the flutter is because its not opening all the way at low boost. You may need to T into your wastegate hose and attach it to the second port on your SSQV so at low boost it opens all the way and doesn't flutter. Otherwise you may have compressor surge.

It's the new version. Non-adjustable and it only has one port. I do get +1 style points because it's the black version.

Purple insert!

I'm recirculating. MAF-T setup once I get a steady paycheck this summer.