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| Chat General Discussion About The Nissan 240SX and Nissan Z Cars |
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03-01-2008, 11:55 PM
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#1 |
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Zilvia Member
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Compressor Surge Anyone? (Vid)
I made a little video as my front end is all taken apart... this made it quite simple to attach the camera onto the radiator support.
This is the most appropriate forum section i could think of putting it. No people were endangered or anything. I might've scared a few small children... but that I pretty much did on purpose. [ame]http://youtube.com/watch?v=LZUbo_mNDZM[/ame] Pretty pointless but I hope you like it  |
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03-02-2008, 12:04 AM
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#4 | |
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Zilvia Member
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My life would be complete if it blew up during the filiming.  |
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03-02-2008, 12:05 AM
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#6 | |
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Zilvia Member
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Just messing around. Yeah, i'm sure if were to get a disco potato or a 2871r, I'd put a bypass valve on. The t28s make a really nice pigeon noise when they surge, You should definitely do it! |
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03-02-2008, 02:40 AM
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#8 |
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Zilvia Addict
 
Join Date: Jun 2007
Location: Sahara
Age: 40
Posts: 617
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Sounds like a bus. I hear the bus' turbo surge everyday. I like it tho.
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The best engine in the world is the vagina, it takes any size piston, its self lubricating, starts with 1 finger, and every 4 weeks does its own oil change. It's just a pity the management system is so fucking temperamental. |
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03-02-2008, 03:06 AM
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#10 |
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Zilvia Member
Join Date: Dec 2007
Location: australia
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its all bs myth that "compressor surge" actually damages the wheel/cartridge
it does jack shit... flutter will always rule over wank valves... 1.1 bar boost through standard s15 t28 turbo for 3 years - no wankvalve... constant flutter - turbo is still kicking in perfect condition |
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03-02-2008, 04:18 AM
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#11 | |
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2 years and running NO problems whatsoever ... 15psi +1 for myth |
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03-02-2008, 03:28 AM
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#13 | |
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Post Whore!
 
Join Date: Dec 2006
Location: Riverview, FL
Age: 36
Posts: 5,557
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Quote:
right now im running w/o a bov b/c i got a hot pipe and my old HKS leaked... it so awesome to hear it... besides in only a t25....so cheap to replace.... its really addictive.....but i still want to put on my new HKS ssqv...  torn btwn.....
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03-02-2008, 03:46 AM
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#14 |
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Leaky Injector
Join Date: Nov 2007
Location: Fort Hood, TX
Age: 40
Posts: 135
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Is it really that harmful for the turbo? I like the way it sounds but id never do it if it was that destructive. I hear alot of car's that sound like this either way.
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03-02-2008, 03:51 AM
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#15 |
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Post Whore!
Join Date: Dec 2006
Location: Riverview, FL
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aslong as you dont drive around like a lunatic smashing and letting off ever 1.5 secs its not to death terrible to you turbo
but if you dont want to have to replace you turbo every 3 months i would advise getting a Bov.
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03-02-2008, 03:52 AM
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#16 | |
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Post Whore!
Join Date: May 2002
Location: Orange County, California
Age: 46
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Quote:
i ran no bov for a year daily drive and tracked i know quite a few people w/o one shits fine. yes it WILL shorten the life of your turbo, but its not the end of the world. |
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03-02-2008, 03:57 AM
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#17 |
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Zilvia Junkie
 
Join Date: Oct 2003
Location: Norway
Age: 39
Posts: 345
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I ran my gt2860rs 1.2-1.3bar a year, on the road and drifting.. without bov, the turbo is still fine.
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2011 BMW F11 5-series and 2003 Nissan 350Z |
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03-02-2008, 04:48 AM
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#22 |
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Zilvia Member
Join Date: Dec 2007
Location: australia
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^^^ wtf?
and to further put fact towards the myth... all it is, is the charged air bouncing off the closed TB back through your pipework and being cut by the blades going the other way... yes air can erode stuff - over 100's of years... and steel is a bit more sturdy than rock etc |
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03-02-2008, 11:30 AM
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#23 | |
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Post Whore!
 Join Date: Apr 2004
Location: Houston, TX
Posts: 2,701
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Quote:
Compressor surge is the compressor wheel aerodynamically stalling since the massflow through it drops too low for the flow to stay attached for a given pressure ratio. It has nothing to do with "air bouncing" and being "cut by the blades." It's not that it "erodes" anything, it's that the wheel doesn't stall uniformly, so it will axially and radially load the CHRA bearings, and in extreme cases can cause the compressor wheel to disintegrate. Obviously Garrett builds its consumer grade turbos "stout" enough such that they can handle the stress in the wheel, and while the bearings wear faster it is not the end of the world. The wheels would flow more and spool faster if they were thinner and weaker, but they have to survive destruction testing at some multiple of what they think the wheels would ever see in normal use. That said, a recirculated BOV/BPV will keep the turbo spooled up better than with valve and surging the wheel(it slows down very quickly as you can hear from the vid). Fighter jet engines blow up from time to time just due to pressure variations across the compressor face introducing vibrations across the blades since they are more "bleeding edge" than a consumer grade turbo. |
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03-02-2008, 12:17 PM
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#26 | ||
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Nissanaholic!
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Quote:
Quote:
I've had a T25 that I ran chatter on for about a year and as far as I know is still kickin, and I've had a GT28 that lasted about a year, I treated that thing like shit though, it probably would have gone longer if I hadn't shut it down hot all the time and what not. I won't be doing it on the 3071 though. I'm also going to MAP so it doesn't matter as much and the no BOV definitely does put some lag back in the turbo. Its cooler than fouling out plugs once a month though. POS T25 took longer to get going than most 30R cars I've ridden in/driven |
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03-02-2008, 12:21 PM
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#27 |
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Post Whore!
Join Date: Apr 2004
Location: Houston, TX
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I picked up at least a few tenths of a seconds response recirculating my SSQV with no other changes. Makes sense as you're reducing the pressure ratio across the compressor by exhausting compressed air back into the intake pipe towards the compressor.
I honestly wasn't expecting to feel a difference, but it was easily noticeable. |
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03-03-2008, 11:23 AM
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#28 | |
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BANNED
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if it was a $1200 turbo, it would surge..I would bet... I was a track in NH, caanan, and he was running NO BOV, Surging more than I have heard any turbo...Sounded NASTY! from 400ft... not to mention he killed it that day!! (the track not the turbo) lol... Last edited by sillyvia13; 03-03-2008 at 11:24 AM.. Reason: (the track not turbo) comment needed to be added. |
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03-02-2008, 10:39 AM
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#30 | |
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Zilvia Member
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Quote:
For all of you who enjoyed the video or hated it but still suffered through it, Thanks for watching!  Yes I know of countless numbers of cars that have run no bov for years with no problems. The thing is my car is my daily driver and I only run it at 7psi, so i'm pretty sure nothing bad is going to happen. Even it if does, as some of you stated, its jsut a wrthless pos t25. Its deserves to die and go to hell. |
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