Rate this: Blow off valves (1 Viewer)

BOVs- Yay or nay?

  • Yay! Love the loud flutter (fully sik!)

    Votes: 0 0.0%
  • Yay as long as not too loud

    Votes: 0 0.0%
  • Nah it's douchey

    Votes: 0 0.0%
  • What's a blow off valve? / I don't care

    Votes: 0 0.0%

  • Total voters
    0

seremify007

Junior Member
Joined
Apr 29, 2004
Messages
10,059
Location
Sydney, Australia
Gender
Male
HSC
2005
Uni Grad
2009
I'm asking more in general whether people think they are or aren't cool considering there are some guys who purposely get a much louder atmo ventilated BOV... or worse, some people buy the fake BOV speakers and fit it to their car *shudder*

I personally have my stock BOV and it's already quite a bit loud... but I do like the sound. Not sick of it yet :)
 

hvf26

Awesome Member
Joined
Jul 25, 2008
Messages
297
Location
extremely bored
Gender
Male
HSC
2010
theyre useful in venting excess boost so it helps in not damaging parts :)
but if theyre too loud theyre so douchey...
 

Havox

Active Member
Joined
May 11, 2010
Messages
764
Location
Sydney
Gender
Male
HSC
2009
Uni Grad
2014
If the loudness is a necessity then its fine, but if its a done up Excel then its douchey.
 

Optimus Prime

Electric Beats
Joined
Jul 23, 2007
Messages
405
Location
Wherevr sentient beings are being mistreated
Gender
Male
HSC
2010

Havox

Active Member
Joined
May 11, 2010
Messages
764
Location
Sydney
Gender
Male
HSC
2009
Uni Grad
2014
edit: also your bov is shit and not doing its job because its too quiet, flutter is compressor surge.
Noise isn't everything...An Evo is a no compromise track car and I'm positive Mitsu engineers know what they're doing especially when it comes to turbocharging. They'd at least know a lot more than you do and what is appropriate/necessary for their flagship beast.
 

seremify007

Junior Member
Joined
Apr 29, 2004
Messages
10,059
Location
Sydney, Australia
Gender
Male
HSC
2005
Uni Grad
2009
smaller engine plus stock is like 16 on an evo?
smaller engine? no idea what u're referring to but stock is 19psi.

SS-T boost varies dependant of mode you are in.

1.3 bar in Normal
1.5 bar in Sport
1.7 bar in Super Sport with it spiking into 1.8 at times.

Manual is fairly consistant with the SS-T with max boost.

You have to remember, the 4B11 is a fairly serious engine from factory. Four bolt crank cap on each journal, semi-enclosed deck, forged Mahle pistons, chunky conrods and a strengthened crankshaft. The stock engine reads like a 'built' engine. Why do you think we can take the car from 217kW to 275kW with just an ECU tune and a rear muffler modification. Thats all!
Source: Kijima, Evo X stock boost - JDM Style Tuning Forum (he works for TMR Australia)

Note: (approx from Google)
1.3 bar = 18.9 psi
1.5 bar = 21.7 psi
1.7 bar = 24.7 psi

edit: also your bov is shit and not doing its job because its too quiet, flutter is compressor surge.
...as for the BOV being too quiet... it isn't venting to atmo since it's a compressor bypass valve so u are correct. either way though, it's stock mitsu and does the job. the fluttering sound is coming from the intake rather than the bypass but it's still a bit noisy on the outside of the car.
 
Last edited:

Optimus Prime

Electric Beats
Joined
Jul 23, 2007
Messages
405
Location
Wherevr sentient beings are being mistreated
Gender
Male
HSC
2010
its a great sports car, yeah, but its still a road car too, and the bov is somewhat quiet because noisy ones are annoying. Just like stock exhausts are relatively quiet. Flutter sound is compressor surge, that's all there is to it. No doubt that they have reasoned that that level of it is acceptable without shortening the compressors life.
Noise isn't everything...An Evo is a no compromise track car and I'm positive Mitsu engineers know what they're doing especially when it comes to turbocharging. They'd at least know a lot more than you do and what is appropriate/necessary for their flagship beast.
I'm not disputing they know what they're doing, but as you said they choose what is appropriate not what is absolutely the best performance.
 

Havox

Active Member
Joined
May 11, 2010
Messages
764
Location
Sydney
Gender
Male
HSC
2009
Uni Grad
2014
its a great sports car, yeah, but its still a road car too, and the bov is somewhat quiet because noisy ones are annoying. Just like stock exhausts are relatively quiet. Flutter sound is compressor surge, that's all there is to it. No doubt that they have reasoned that that level of it is acceptable without shortening the compressors life.
Yea, shouldn't be a problem then. Just the sound of the compressed air going through the intake, hitting the throttle and going back through the turbo. As long the pressure surge and backflow isn't too high then there shouldn't be any ill effect on performance or durability. Like you said, the engineers have already taken this into account :)
 

seremify007

Junior Member
Joined
Apr 29, 2004
Messages
10,059
Location
Sydney, Australia
Gender
Male
HSC
2005
Uni Grad
2009
At the end of the day, the car is designed for road use as well as track use- these factors have already been considered when they tuned the engine at the factory. Whether or not that still applies once you get the 270kW+ ECU tunes is another matter.

Anyway I'm not planning to go for an aftermarket BOV. Last thing I need is more attention. Currently considering dewinging it.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top