Pshh sound
Jun 15, 2007, 08:59 AM
#1
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Pshh sound
ok! ok! i know i know, newb newb, yes im a neeeewwb 
I love it when cars make that PSHHH sound i think when they switch gears.
the pshh sound like in the fast and furious. You know what im talkin about?
well what makes that PSH sound effect? and what is exactly happening when it occurs?
dont be too harsh on me ;
Jun 15, 2007, 09:13 AM
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I cant understand why people would post back something non-positive. The guy asks a simple question, either answer the guy or pass it.
The sound varies, intake or BOV, etc......
The sound varies, intake or BOV, etc......
Jun 15, 2007, 09:14 AM
#6
ok! ok! i know i know, newb newb, yes im a neeeewwb I love it when cars make that PSHHH sound i think when they switch gears.
the pshh sound like in the fast and furious. You know what im talkin about?
well what makes that PSH sound effect? and what is exactly happening when it occurs?
dont be too harsh on me ;
Jun 15, 2007, 09:36 AM
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Yea i was ready for all the negitive comments. its ok, im sure everyone one evom started out somewhere.
so it could be the intake or the bov? when does it acually make the sound? when you shift up?
so it could be the intake or the bov? when does it acually make the sound? when you shift up?
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Jun 15, 2007, 09:50 AM
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I was going to say you shouldnt be driving an evo if u asked that question. But I just looked at ur avatar and you are driving an 04 ODDESSY so... no "psst" noise for you
Jun 15, 2007, 09:59 AM
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They make a doo hickey thingy that makes that sound for non turbo cars. You can make it go off at any rpm. This jack hole that lives near me drives by my house all the time lettin that thing go off right in front of my house. He drives a VW. Because I have an evo in the driveway probably makes him think i will be impressed.
If the sound is what you want, get the hks or turboxs bov. But be prepared to have your car run crappy.
If the sound is what you want, get the hks or turboxs bov. But be prepared to have your car run crappy.
Jun 15, 2007, 10:05 AM
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putting an intake on will allow the bov to make that "pshhh" noise. However, when you put the intake on, it needs to be tuned for it (like every mod you put on)otherwise you mess with the mass airflow readings. That air that you hear is the excess air that the turbo does not use and needs to vent it somewhere which in this case is back into the intake.
oh, and don't think that you can go drifting with this car, its not the fast and the furious
oh, and don't think that you can go drifting with this car, its not the fast and the furious
Jun 15, 2007, 10:07 AM
#14
I guess I'll explain for you ...
The sound come from pressurized air from the turbo being released. The valve that does this, called a blow off valve or diverter valve, is positioned between the turbo and the throttle body. When you apply throttle, the turbo builds pressure. When you let off the throttle the throttle body closes which quickly stops the flow of the pressurized air. At this point the air tries to find a way to escape just as any other pressurized system acts. The BOV/DV releases this air by opening when the throttle body closes. It is opened using a combination of vacuum from the top and boost pressure from below.
If the BOV/DV wasn't there, the air would try to escape back through the turbo and stall the turbine causing compressor surge. This is bad because exhaust gases are still trying to spin the turbine but the air pressure on the other side is trying to stop it. This puts extreme stress on the turbines and the shaft that connects them.
It is a very useful and important part of the turbo system that just happens to sound really cool.
The sound come from pressurized air from the turbo being released. The valve that does this, called a blow off valve or diverter valve, is positioned between the turbo and the throttle body. When you apply throttle, the turbo builds pressure. When you let off the throttle the throttle body closes which quickly stops the flow of the pressurized air. At this point the air tries to find a way to escape just as any other pressurized system acts. The BOV/DV releases this air by opening when the throttle body closes. It is opened using a combination of vacuum from the top and boost pressure from below.
If the BOV/DV wasn't there, the air would try to escape back through the turbo and stall the turbine causing compressor surge. This is bad because exhaust gases are still trying to spin the turbine but the air pressure on the other side is trying to stop it. This puts extreme stress on the turbines and the shaft that connects them.
It is a very useful and important part of the turbo system that just happens to sound really cool.
Jun 15, 2007, 10:08 AM
#15
More often than not it is a VTA (vent to atmosphere) BOV (blow off valve) although some of the recirculating BOVs can make the same sound, but are typically not as loud.
As the turbo spools, pressure builds up in the UIP (upper intercooler piping) as it enters into the throttle body. When shifting gears the engine does not need all that built-up pressure and it needs to release it somewhere. So instead of making it go back through the cycle (UIP, intercooler, LIP, wastegate) and possibly causing your turbo to spin backwards (not good for the turbo) it is released at the BOV causing the "Pshh sound."
As the turbo spools, pressure builds up in the UIP (upper intercooler piping) as it enters into the throttle body. When shifting gears the engine does not need all that built-up pressure and it needs to release it somewhere. So instead of making it go back through the cycle (UIP, intercooler, LIP, wastegate) and possibly causing your turbo to spin backwards (not good for the turbo) it is released at the BOV causing the "Pshh sound."