Supra N_A Posted April 25, 2012 Share Posted April 25, 2012 (edited) for bpu owners does any one run to bov? does it flutter at all? also for any one asking.. no not going single turbo ok Edited April 25, 2012 by Supra N_A (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted April 25, 2012 Share Posted April 25, 2012 yes it does flutter , i have a adjustable bov and set it so light lift off you would get the flutter,never bothered going without one though and now im single turbo so now the adjuster is right out so i dont get too much from high boost lift off, with singles the bov reaction time needs to be quicker . Quote Link to comment Share on other sites More sharing options...
Supra N_A Posted April 25, 2012 Author Share Posted April 25, 2012 so you had a bpu supra and it did flutter ?? how loud was it btw? no were near the sound singles make? reason I ask as when my tt was stock i tried to bov and it did not flutter at all but now running more boost and power surley it should? Quote Link to comment Share on other sites More sharing options...
Noz Posted April 25, 2012 Share Posted April 25, 2012 (edited) [COOL][/COOL]installing a dump valve shouldnt create flutter, it is there to remove it? flutter is compressor surge, which your dump valve removes by releasing built up pressure (which would spin the turbo and cause flutter). I could be wrong. Also, boost is not related to flutter, compression stall should either be there or its not. If you use a dump valve, you will only get surge from the excess pressure the bov can not remove. at a guess? Edited April 25, 2012 by Noz (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted April 25, 2012 Share Posted April 25, 2012 yes when i was bpu i set it to slightly flutter, but i never blanked off the bov completly which is what you would need to do with the stock one, so i dont know how loud it would be in stock format try it and go see. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 25, 2012 Share Posted April 25, 2012 installing a dump valve shouldnt create flutter, it is there to remove it? flutter is compressor surge, It's not. It's compressor stall. Quote Link to comment Share on other sites More sharing options...
mellonman Posted April 25, 2012 Share Posted April 25, 2012 surge is when the turbo cant flow enough right? ie exhuast side Quote Link to comment Share on other sites More sharing options...
Noz Posted April 25, 2012 Share Posted April 25, 2012 It's not. It's compressor stall. Doh! Quote Link to comment Share on other sites More sharing options...
Supra N_A Posted April 25, 2012 Author Share Posted April 25, 2012 right just blocked the bov of there in theory it should flutter BUT mine starts to do it for 1 second then dies on.. got to be somthing to do with the maf sensor then as it is the vvti tip... sniffles no fluttttterrrrrrrrrrrrrrrrrrrrrrrrrrrrrr owelll psssssssssssssssshhhhhhh back on.. Quote Link to comment Share on other sites More sharing options...
mellonman Posted April 25, 2012 Share Posted April 25, 2012 completly removed and hole blocked up. was this with driving at what boost and how long do you think it should last Quote Link to comment Share on other sites More sharing options...
Supra N_A Posted April 25, 2012 Author Share Posted April 25, 2012 completly removed and hole blocked up. was this with driving at what boost and how long do you think it should last well there was no need to take the hks ssqv out i just removed the air pressure hose that goes to the hks ssqv nipple and blocked that off (2 hoses) drove the car to like 0.8bar and made very weak flutter then cut.. Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 25, 2012 Share Posted April 25, 2012 Mine has no bov, it rarely 'flutters' but it does sound exactly like it has a bov it just comes back out of the airbox. Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 25, 2012 Share Posted April 25, 2012 surge is when the turbo cant flow enough right? ie exhuast side Surge is when a turbo tries to flow more air than the engine can ingest at that time and the flow reverses and becomes unstable, which then leads to compressor stall. Quote Link to comment Share on other sites More sharing options...
Noz Posted April 25, 2012 Share Posted April 25, 2012 so flutter is therefore compressor surge causing compressor stall? Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 25, 2012 Share Posted April 25, 2012 Yes, it's just the sound it makes. When you close the throttle, the turbo is pushing air in still and it can't go anywhere. Technically that's just stall, surge is specifically when a turbo flows more air than the engine can handle at that RPM point, rather than when an artificial restriction is put in place (i.e. the throttle closing), and that leads to stall. But that's just semantics really Some people aspire to it, some people hate it, some people ignore it. I personally hate it and think it's bad for the turbo. We had a discussion about this a while back, I'd be interested to know how long the stock turbos last without any BOV in place Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 25, 2012 Share Posted April 25, 2012 Mine has done 30000ish miles with no bov, no problems to date. 30k is a rough guess though Quote Link to comment Share on other sites More sharing options...
supra joe Posted April 25, 2012 Share Posted April 25, 2012 Is there not a specific valve that you can get to make the fluttering noise ? Quote Link to comment Share on other sites More sharing options...
p3te Posted April 25, 2012 Share Posted April 25, 2012 mine makes the fluttering sound, i think an induction filter is needed and not the standard air box, also it use to do it more when i had a hks mushroom filter fitted (i have K&N now), my uk spec never use to do it with a recirculated bov and air box Quote Link to comment Share on other sites More sharing options...
Supra N_A Posted April 25, 2012 Author Share Posted April 25, 2012 mine makes the fluttering sound, i think an induction filter is needed and not the standard air box, also it use to do it more when i had a hks mushroom filter fitted (i have K&N now), my uk spec never use to do it with a recirculated bov and air box is it loud mate?? dunno if it is becouse mine has the maf in place Quote Link to comment Share on other sites More sharing options...
p3te Posted April 26, 2012 Share Posted April 26, 2012 Its quite loud yeah, from in the car anyway I don't know how it sounds from outside lol, I have a vent on my bonnet right above the air filter and bov as well Quote Link to comment Share on other sites More sharing options...
Supra N_A Posted April 26, 2012 Author Share Posted April 26, 2012 Its quite loud yeah, from in the car anyway I don't know how it sounds from outside lol, I have a vent on my bonnet right above the air filter and bov as well take a quick vid on the iphone mate and text me it haha! Quote Link to comment Share on other sites More sharing options...
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