supradibbs Posted September 7, 2006 Share Posted September 7, 2006 been reading up a little on this just thought i would see what your opinions are there is alot off people out there that think running twin bovs on big hp cars can dramatically reduce compressor surge,as i will be running over 600hp was thinking going down this route using 2 hks ssqs one on the ic pipe before the intercooler and one after the intercooler by the throttle body whats your views on this Link to comment Share on other sites More sharing options...
Tom Posted September 7, 2006 Share Posted September 7, 2006 Have a read here http://www.supraforums.com/forum/showthread.php?t=240287 Looks like it may be worth doing it?? **awaiting Ian C or Alex** Link to comment Share on other sites More sharing options...
supradibbs Posted September 7, 2006 Author Share Posted September 7, 2006 Have a read here http://www.supraforums.com/forum/showthread.php?t=240287 Looks like it may be worth doing it?? **awaiting Ian C or Alex** yeah thats what i was reading i know trd3000gt is running 2 but we all know what a big tart he is:D Link to comment Share on other sites More sharing options...
JustGav Posted September 7, 2006 Share Posted September 7, 2006 The BOV's are only good for handling around 500bhp, and lets be honest we all enjoy a good blow job, so two is probably a very good idea. I've got one on the hardpipe going to the throttle body, but I've seriously considered putting one on the pipe just before the intercooler as well.... Link to comment Share on other sites More sharing options...
TRD3000GT Posted September 7, 2006 Share Posted September 7, 2006 yeah thats what i was reading i know trd3000gt is running 2 but we all know what a big tart he is:D Yes.. Link to comment Share on other sites More sharing options...
Class One Posted September 7, 2006 Share Posted September 7, 2006 Have a read here http://www.supraforums.com/forum/showthread.php?t=240287 Looks like it may be worth doing it?? **awaiting Ian C or Alex** You'll be waiting a while, one is on holiday and the other has some interweb type stuff probs (can't get access!) Link to comment Share on other sites More sharing options...
Ian C Posted September 7, 2006 Share Posted September 7, 2006 Fortunately I can access this place from work still though (I'm not the one on holiday ) Being Mr Function-Over-Form I'd say use one BOV until you get compressor stall and can directly attribute it to the one BOV not shifting enough air out the door in time. I've never heard of anyone needing two before. -Ian Link to comment Share on other sites More sharing options...
AshBhp Posted September 7, 2006 Share Posted September 7, 2006 One, of these should take care of your needs. http://www.hksusa.com/products/?id=759 Link to comment Share on other sites More sharing options...
LeeT Posted September 7, 2006 Share Posted September 7, 2006 i'm running one at the moment but am considering running a 2nd Link to comment Share on other sites More sharing options...
wkdtime Posted September 7, 2006 Share Posted September 7, 2006 With big singles two is reccomended unless you dont mind compressor surge/Turbo stall... as one BOV wont be enough to release all the air, so thus some is forced back into to the compressor and hits the blades causing turbo stall...hence the chopping/pigeon noise. Link to comment Share on other sites More sharing options...
JamieP Posted September 7, 2006 Share Posted September 7, 2006 I have been advised to run a second bov... its on my list of things to do. Link to comment Share on other sites More sharing options...
wkdtime Posted September 7, 2006 Share Posted September 7, 2006 But to be honest guys, who has heard of a turbo failing due to turbo stall (No BOV)...IMHO it sounds nice, much better than chavy BOV's. There are plenty of track Turbo'd cars that run without BOV's...is it that bad or just hype? Anyone? Link to comment Share on other sites More sharing options...
Pig Posted September 7, 2006 Share Posted September 7, 2006 dunno, but i like the noise. so i think one is better! Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 7, 2006 Share Posted September 7, 2006 A BOV won't affect compressor surge, that's a sizing V airflow requirements issue. I have never, and will never, run a BOV on any of my turbo engines, IMO they are extra weight, plumbing and hassle and do sod all for spool up or anything else other than reducing compresssor noise on throttle lift off, which is what they were designed for anyway. Unless it's a "silly" vent to atmo one which just makes annoyiing noises 3 of the UK's topmost turbo experts agree, it's not another of my bee in bonnet dogmas! Link to comment Share on other sites More sharing options...
LeeT Posted September 7, 2006 Share Posted September 7, 2006 A BOV won't affect compressor surge, that's a sizing V airflow requirements issue. I have never, and will never, run a BOV on any of my turbo engines, IMO they are extra weight, plumbing and hassle and do sod all for spool up or anything else other than reducing compresssor noise on throttle lift off, which is what they were designed for anyway. Unless it's a "silly" vent to atmo one which just makes annoyiing noises 3 of the UK's topmost turbo experts agree, it's not another of my bee in bonnet dogmas! interesting info Chris, i personally hate the sound of BOV's so i'll stick with just the one then. I love the compressor noise:) Link to comment Share on other sites More sharing options...
Stu Storm Posted September 8, 2006 Share Posted September 8, 2006 They seem to love the big BOV setups in the US chris, or is that just there mentality? As they do have some seriously powerful cars over that side of the pond! Hhmm maybe dusty or Jarrett may want to comment?? I had a Big Turbosmart BOV on my track skyline and tbh did not notice any diff exept the noise of course! Link to comment Share on other sites More sharing options...
wkdtime Posted September 8, 2006 Share Posted September 8, 2006 A BOV won't affect compressor surge, that's a sizing V airflow requirements issue. I have never, and will never, run a BOV on any of my turbo engines, IMO they are extra weight, plumbing and hassle and do sod all for spool up or anything else other than reducing compresssor noise on throttle lift off, which is what they were designed for anyway. Unless it's a "silly" vent to atmo one which just makes annoyiing noises 3 of the UK's topmost turbo experts agree, it's not another of my bee in bonnet dogmas! But these arent like Rally cars with 360 Deg. bearing trubos, so surely the turbo stall caused by not having a BOV isnt good for stock ceramic turbos when running high boost..are they not prone to shattering this way...? any thoughts? Link to comment Share on other sites More sharing options...
Ian C Posted September 8, 2006 Share Posted September 8, 2006 3 of the UK's topmost turbo experts agree, it's not another of my bee in bonnet dogmas! Graham Bell and Corky Bell (no relation) don't agree with you I bypassed my stock BOV once with the hybrids in place and even just revving it up at standstill generated such a hideous noise from the turbos (ratch-ratch-ratch-ratch) as they stalled (not surged ) on liftoff. My mechanical sympathy bone made me fit a BOV. Some rogue bling gene made me fit the purple fin insert and aim it out one of the bonnet vents But I still maintain that all those poeple thinking of getting a second one are just doing it for willy waving, because I see no posts in tech asking what that ghastly noise is when they lift off.... -Ian Link to comment Share on other sites More sharing options...
Daston Posted September 8, 2006 Share Posted September 8, 2006 surly if they didnt need one toyota wouldnt have spent lots of time and effort putting one on in the first place. Link to comment Share on other sites More sharing options...
Ian C Posted September 8, 2006 Share Posted September 8, 2006 Not necessarily true. A good few things are in place to combat NVH or emissions so it's nicer for the average punter. The car/engine may not necessarily "need" them. Expansion chambers on the intake, balancer shafts in the engine, crankcase ventilation, charcoal canisters, exhaust gas recirc, CATs, silencers, sound deadening... If the only problem with shutting the throttle on a boosting turbo is that ghastly noise then the BOV may be in there only to stop the noise. I still reckon it's bad for the turbo though -Ian Link to comment Share on other sites More sharing options...
Daston Posted September 8, 2006 Share Posted September 8, 2006 well I will have the best of both the nice phissst bov and chatter from the WG so I'm all happy. Do see your point about them doing things to make the buyer happy. Link to comment Share on other sites More sharing options...
wkdtime Posted September 8, 2006 Share Posted September 8, 2006 well I will have the best of both the nice phissst bov and chatter from the WG so I'm all happy. Do see your point about them doing things to make the buyer happy. Lol plump in another BOV and the chatter will go away! That 'Wastegate Chatter' is actually turbo stall you are hearing, there is no such thing as 'Wastegate Chatter' its just what people refer to it as. Your BOV is unable to release all the air from the free spinning turbo when off throttle (as the engine does not require it obviously) this is normally the case with singles as you have a much greater volume of air, so part of the air that could not be released surges back through the compressor and hits the blades...hence the chopping noise you hear which is commonly known as 'wastegate chatter'. Link to comment Share on other sites More sharing options...
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