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View Full Version : Blow Off Valve (blows or doesnt?)



MrT0mJones
01-11-2007, 11:40 AM
so, the common misconception of these guys, just get one and pop it on, you'll be good, as long as it makes noise.

Eh. kinda, if your the guy that is all about the woosh or chirp, and dont care of what they are good for, no need to read anymore.



Ebay (cheapo) anything generally under 40 bucks on there.

These have TERRIBLE spring ratings and a metal to metal seal.. What is the point?

Psi Rating (0-2 psi) and will still leak like crazy.


Turbo XS RFL - I'm sure some of you may have this one, and swear by it, but i had this bad boy pressure tested. you may not feel it, but she leaks, and gets gradually worse and worse (they give you washers to make it seat better??) Its also a metal to metal seal, like the EBAY blow off valve . I would not reccomend anything over 12psi on this blow off valve (any t28 or larger turbo) It just wont cut it.. sure its louds as all, but its not the point, you just want an accurate release, and it to hold pressure. (i dont reccoment it at all.

SSQV - Chirp CHIRP CHirp. It may get annoying, but this bad boy can hold some boost, i've seen them run up to 34 psi on a twin 20G stealth and hold down. Alot of people run these on a sequential blow off setup, (they are very precise on the spring tension and all), slowly had seeping at 30psi, but not much.

Greddy type RS - Installed one of these on a friends car, Very adjustable to say the least (set her too loose when i put it on) great sound WOOSH and deffinately can hold the pressure with the adjustments. The spring is a tad weaker than in the type-S and the sound is much different, but i'd say it would probably hold in the lower 20's range. Has a GREAT rubber seal.

Greddy Type-s - Was and is the competition for the SSQV (not the ebay brand, the seal is a bit different) I love mine, and have run her up to 19psi and i'm positive she's capable of much more. very reliable and have had no seal or wear troubles out of it completly.

Sard RACING blow off valve - Terrible from what i've seen, i've heard people preach them and people hate them, i first person saw this create some of the worst surging ever, and then leaking like crazy (i dont know how it accomplished both oh so well on the same setting.) i do not reccomend it, but its brother is a different story.

Sard r2d2 - This blow off valve has one of the CRAZIEST seals i have EVER seen. It will hold pretty much whatever you throw at it, and then some, the only quarrel i have with the blow off valve is the outlet is a tad small for the dynamics of the air. wich i havent seen create any flow problems, but i'm questionable on it.

Thats all for now, i can update the list as i run into more.

I know its probably useless, but i like just putting stuff in for people to gander at.

Dont hate me on any of this, all of this is first hand experience, if your's has differed, let me know, so i can update it!

flip
01-11-2007, 12:00 PM
Great writeups, I have the SSQ on my STi...

JTA021
01-13-2007, 06:51 AM
hehe im the one with the greddy type rs YAY! lol

babowc
01-15-2007, 01:07 AM
is the purple one Greddy RS or S?

we had the purple one and it was REALLY hard to control the settings on it..
either surged or leaked like crazy.
this was on a 06 STi my neighbor had..

dumped the Greddy BOV for the HKS unit :)

Infinite
01-19-2007, 12:22 AM
hks ssqv FTL

we did some testing and the things repsonse time is slow as shit. i had a Freddy type-s on my 240 and it was nothing but compressor surge. put on a turbonetics raptor and ive been happy snce. 0 compressor surge and sounds sexy.

the next blow off valve i purchase will be the synchronic... a piston type blow off valve.

MrBojangles
01-22-2007, 12:35 AM
doesnt the ssqv have an adjusting screw on it that you can use to change response time based on the boost application?

flip
01-22-2007, 01:21 AM
doesnt the ssqv have an adjusting screw on it that you can use to change response time based on the boost application?

Yes but I'm not sure how to set it correctly...

I'm sure theres a good article out there on how to do it... Lemie look...

flip
01-22-2007, 01:23 AM
Heres an example...

To adjust a Turbosmart BOV, rotate the cap in the ***65533;***65533;***65533;SOFT***65533;***65533;***65533; direction up to, but not beyond, the indicator groove. With the engine at idle, the exhaust port should be closed off by the piston. Free rev the engine and back off quickly. The engine should return to normal idle speed - if the revs drop below idle or engine stalls, increase the spring tension by half a turn. Repeat until the engine free revs and returns to normal idle speed. Test drive the car. If the engine backfires or stalls upon deceleration or gear changes, check all BOV connections, prior to increasing the spring tension again.

plv
01-22-2007, 02:02 AM
i have the apexi twin chamber and it works fine i guess. sounds pretty good, its not circulated, kinda wish it was.

flip
01-22-2007, 02:07 AM
i have the apexi twin chamber and it works fine i guess. sounds pretty good, its not circulated, kinda wish it was.

Yah from time to time i wish mine was recurc. as well... Mostly for the running ruch...

Infinite
01-22-2007, 02:09 AM
Yes but I'm not sure how to set it correctly...

I'm sure theres a good article out there on how to do it... Lemie look...
the adjusting screw on the ssqv has been proven to do nothing. if you notcied hks even elimanted it on the newer ssqv's. its supposed to be a preload screw for the spring but it doesnt do a damn thing

zenki_s14
01-22-2007, 03:16 PM
yeah i was about to say i actually have a newer one it is very responsive but releases if you even barely touch the pedal ... can be annoying when you are trying to just drive in traffic or driving up hill .

MrBojangles
01-22-2007, 04:14 PM
so the ssqv you wouldnt reccomend for a mild boost setup (~16-20 psi)? shit lol

PS JGS Precision is making a pretty sweet piston type bov. They have the solidworks image and a prototype of it over at KA-t.org. Right now no adjustability because they are building a handful for customers with race only applications on high boost motors, but they say in the near future they make it based towards the lower boost ranges as well.

zenki_s14
01-22-2007, 07:46 PM
no hks is an excellent choice and have held way over 20 psi with no problems

Infinite
01-23-2007, 05:29 AM
ssqv sucks
its not about how much boost it can hold. its about how it reposnds to pressure changes/shifts/throttle lifts

when you close the throttle plate suddenly the hks doesnt react quick enough and it causes surge before it opens. go look at any datalog and you'll see this (big blow off valve comparison in magazines a few years back compared valve lift, reaction time, etc) and the hks came out worst of all

BenefitX
01-24-2007, 03:06 AM
i have a ARC bov, it sounds sort of like a ssqv with a higher tone...idk if it competes with those but i like it :)

zenki_s14
01-24-2007, 11:48 AM
I allways thought that would have a quiter tone ..... i had the old blitz bov and it sucked bad

PSINXS
01-25-2007, 05:24 AM
Greddy TYpe RS FTW. i loveit even better than my type s i had.

Infinite
01-29-2007, 07:55 AM
my turbonetics raptor @ 14 pounds is really really loud. it scares people in traffic and those walking down the sidewalks... also makes cop do the neck break jerk too :D

PSINXS
01-29-2007, 12:30 PM
i've heard good things about the raptor bovs

bluuuurr
02-01-2007, 03:51 AM
is anyone running a Blitz SuperSound BOV? I just bought one off a friend a few days ago for the turbo'd motor I don't have yet.. lol

Infinite
02-08-2007, 06:18 PM
i had one, sounded ok but it leaked. and to run anything over 18psi you have to order a stiffer spring from blitz which is around 25-30 bucks

Wedge
02-08-2007, 08:36 PM
SSQV with the loud insert here. It scares little children.

I am sure mine is holding up fine. (boost leak test this weekend.)

MrBojangles
02-11-2007, 08:07 AM
loud insert?....

flip
02-11-2007, 08:11 AM
loud insert?....

You can change the insert inside the BOV which changes the sound it makes...

MrBojangles
02-11-2007, 07:23 PM
ah ic. guess thats pretty self explanatory lol. the insert have any affect on the response time or amount of capacity of air it can discharge?

zakkkaliscious
09-05-2007, 09:20 PM
wow old thread.. anyone us the godzilla bov from turbonetics?

Rbsil80
09-05-2007, 11:06 PM
i use the hks ssq new style one...

BenefitX
09-05-2007, 11:19 PM
ARC FTW

Andy C
09-06-2007, 12:42 AM
I started reading this till i saw that mrbojangles posted. He hasn't been on in a looong time. I'm about to buy a bov so this thread'll help.

turbology
09-06-2007, 02:29 AM
BOV from 1G DSM are known to be realiable and hold high psi.

I got my HKS bov for $90 new few years back.

MOOREOFSTEPHEN
09-06-2007, 07:26 AM
ARC FTW

Hell yeah!!!:goodjob:

hellfire
09-06-2007, 12:01 PM
TiAL.. Here. 50mm which is bigger then some wastegates. Friggin awesome.

Tyler

ct9a gsr
09-06-2007, 09:57 PM
Any real turbocharged performance-oriented car uses a TiAL... and for a damn good reason. It's the best of the best.

Boosted240
09-08-2007, 12:16 AM
HKS SSQ for my SR
I love way it sounds and works great

Kevykev
09-16-2007, 11:43 PM
ssq here as well

Andy C
09-17-2007, 12:11 AM
Is it loud? I dont want one too loud. is it a whistle or a psh sound? lol ya know what I mean?

badass240
09-17-2007, 06:04 AM
damn this is some nice info, too bad it wont do the n/a ka any good lol. but still nice info. +1

I RON DON KEY
09-21-2007, 01:06 PM
So lets come to a conclusion; What is the best bov for the sr20det?

homeslicej2
09-21-2007, 01:21 PM
I have an older style HKS SSQV that tophat put on, I wish they'd have put a new style one on bc I need to recirc mine. It's starting to backfire :(. I love the way it sounds, but will probably try something else next time around. Best BOV for the SR20? Don't know (it also depends on what you define as being best), but I'd say one that can be re-circulated if you are still MAF based as most of us are.

sr20vet
09-28-2007, 01:49 AM
I have the SSQ and love it

Andy C
09-28-2007, 01:57 AM
Me too now!

kamikazi
09-29-2007, 03:34 PM
i have the greddy type s and like it.

v-empire
09-29-2007, 03:36 PM
i run with no BOV

gansta!

osiriskidd
10-02-2007, 01:48 AM
greddy rs