GReddy type r, type s, or type rs...
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From: El Paso Texas
In order to understand how an 'anti-surge' compressor housing works (which is technically a 'ported shroud'), you need understand what surge is, in the first place.
Surge: The 'Surge Line' is the leftmost boundary of a compressor map. This is where flow instability occurs - This is where the compressor wheel is spinning at a high enough speed to force more air than the engine can "ingest". On initial thought, one might think this would just give you more pressure in the intake - and this is true, as long as you are on the compressor map. Basically, the surge line is the MINIMUM airflow needed to keep the pressure from backing up, and causing reverse flow pressure waves - these are INCREDIBLY damaging to the turbocharger!
Follow that thought a little further - when are you constantly seeing high flow of air, but little entering the intake? That's right, when you get off the throttle from boosting. This surging is what a BOV protects the turbo from. You also see this, if you have attempt to spin a compressor wheel such that it is forcing more air into the intake than the engine can take - or attempting to get more boost per rpm of the compressor wheel, than it is designed for.
That said, the ported shroud allows the surge line to be moved further left - this is because the compressor housing allows some of the air that starts to get backed up in the intake, to flow back out the housing. Didn't write this but you get the idea . . .
Here's a pic from Garrett:
Surge: The 'Surge Line' is the leftmost boundary of a compressor map. This is where flow instability occurs - This is where the compressor wheel is spinning at a high enough speed to force more air than the engine can "ingest". On initial thought, one might think this would just give you more pressure in the intake - and this is true, as long as you are on the compressor map. Basically, the surge line is the MINIMUM airflow needed to keep the pressure from backing up, and causing reverse flow pressure waves - these are INCREDIBLY damaging to the turbocharger!
Follow that thought a little further - when are you constantly seeing high flow of air, but little entering the intake? That's right, when you get off the throttle from boosting. This surging is what a BOV protects the turbo from. You also see this, if you have attempt to spin a compressor wheel such that it is forcing more air into the intake than the engine can take - or attempting to get more boost per rpm of the compressor wheel, than it is designed for.
That said, the ported shroud allows the surge line to be moved further left - this is because the compressor housing allows some of the air that starts to get backed up in the intake, to flow back out the housing. Didn't write this but you get the idea . . .
Here's a pic from Garrett:
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I had a Turbo XS RFL Blow off valve and then A Greddy RS on my SRT-4. The RFL was extremely loud (that is why it was named RFL{Really "freaking" Loud}) but leaked really badly! Then switched to the RS, Great sound on the 4-banger engine and held boost Great!. I say go with the RS out of the three!
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From: uniontown, Robinson, Towanda.PA
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From: El Paso Texas
took notes... yeah i know lol i know somebody with a turbo xs rfl and its ******* loud! i dont know how it makes a difference, but it does lol. must be a difference on the inside like maybe how the channeling is on it before it exits the shroud..
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From: El Paso Texas
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LOL I just don't understand why some people love that sound and why they NEED to let the world know that their car is turbocharged. Because in all honesty...the people that do care (ie other car enthusiasts) more than likely already know it's turbocharged...and the rest of the world just thinks your car is ******* annoying.
If I could..I would eliminate that sound from the world...it's absolutely obnoxious having those damn 1.8t VW guys and SRT4 d-bags rev it up when they roll by me just to make that sound and get my attention...what don't they get about me not giving a damn?
If I could..I would eliminate that sound from the world...it's absolutely obnoxious having those damn 1.8t VW guys and SRT4 d-bags rev it up when they roll by me just to make that sound and get my attention...what don't they get about me not giving a damn?
its hard to ride with it sometimes..
ya knwo what im talkin about, like, all the supras that have the type r sounds like some kind of chirp/howl/bark lol... its like, choohoooooooohoohoowwwhoooooo lol but i also wonder if they sound like that because they might have an anti surge housing.... cuz with my Hahn BOV it sounds like a type r but its higher pitch, but this guy that has a gt3076r with anti surge housing and hahn bov it friggin howls,,, so, i dont know, i just want my car to sound like this,,, hang on... will post link to the vids i was watching... I WANT A BOV THAT SOUNDS LIKE THIS!
http://www.youtube.com/watch?v=P4Xdmk7qsGo
here,, is another vid of why i want a greddy type r.... this one is an exact example of how i want it to sound, a lil bit of a whistle, along with some howling....
http://www.youtube.com/watch?v=-cEvqGSZGnY
another vid... another exact example...
http://www.youtube.com/watch?v=fZlqT6IN_XY
http://www.youtube.com/watch?v=P4Xdmk7qsGo
here,, is another vid of why i want a greddy type r.... this one is an exact example of how i want it to sound, a lil bit of a whistle, along with some howling....
http://www.youtube.com/watch?v=-cEvqGSZGnY
another vid... another exact example...
http://www.youtube.com/watch?v=fZlqT6IN_XY
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From: Texas
ya knwo what im talkin about, like, all the supras that have the type r sounds like some kind of chirp/howl/bark lol... its like, choohoooooooohoohoowwwhoooooo lol but i also wonder if they sound like that because they might have an anti surge housing.... cuz with my Hahn BOV it sounds like a type r but its higher pitch, but this guy that has a gt3076r with anti surge housing and hahn bov it friggin howls,,, so, i dont know, i just want my car to sound like this,,, hang on... will post link to the vids i was watching... I WANT A BOV THAT SOUNDS LIKE THIS!
http://www.youtube.com/watch?v=P4Xdmk7qsGo
here,, is another vid of why i want a greddy type r.... this one is an exact example of how i want it to sound, a lil bit of a whistle, along with some howling....
http://www.youtube.com/watch?v=-cEvqGSZGnY
another vid... another exact example...
http://www.youtube.com/watch?v=fZlqT6IN_XY
http://www.youtube.com/watch?v=P4Xdmk7qsGo
here,, is another vid of why i want a greddy type r.... this one is an exact example of how i want it to sound, a lil bit of a whistle, along with some howling....
http://www.youtube.com/watch?v=-cEvqGSZGnY
another vid... another exact example...
http://www.youtube.com/watch?v=fZlqT6IN_XY
hahah dude i cant wait till u meet my buddy chris pete.. he has an srt 4 with an hks and the BOV is his absolute best friend.. i laughed so hard when i read ur post... he was the first thing i thought of.. he will go under full throttle in 4th gear at 50 mph to build pressure and blow off next to a mini van 8 times its hard to ride with it sometimes..
its hard to ride with it sometimes..
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From: El Paso Texas
im wanting that greddy type rs now, i just gotta figure out what ima do with my hahn bov,, i gotta get a regular 1 to 1 coupler, and then take off my upper hot-side pipe and have somebody weld a flange on for the greddy, and make sure i have enough vac line for it... i want to put it a lil farther away from the direct blast of the turbo, maybe that will prevent some of the flutter. in my opinion that would help cuz it aint right there getting blasted by each lil blade on the turbo giving it more reason to open up.... sounding like,,, choohoohoohoohoohoohoohoohoohoohoohooddooododododo dooo
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