Scott Posted June 2, 2009 Share Posted June 2, 2009 id rather not risk it, if toyota fitted them then i suppose it was for a purpose, they do sound nice and if i get the revs just right around 3 tho and let of slowly i get the single sound so im happy. Uk running 1.35. Yup, noise suppression Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted June 3, 2009 Share Posted June 3, 2009 BOVs generally are just to let people know you are there But this also contradicts what Chris was saying. I'd also be interested to know what CW has to say about the Carrot-on-a-Stick modification. This mod, at least, seems to have a sound scientific basis. Quote Link to comment Share on other sites More sharing options...
Scott Posted June 3, 2009 Share Posted June 3, 2009 But this also contradicts what Chris was saying. I think he was referring to the vent to atmosphere ones lol. Quote Link to comment Share on other sites More sharing options...
SMiFFAD Posted June 3, 2009 Share Posted June 3, 2009 I have not run a blow off valve, recirculating, or vented to atmosphere, on a high performance turbo engine for years. IMSA GTP turbo cars, Le Mans prototype turbo cars, F1 turbo cars, the new 450 bhp F2 Mazda engined turbo cars, the AER 4 cylinder 600 BHP 2 litre turbo engine, blah blah, (engines ancient and ultra modern), none of these run a blow off valve. They were instigated by Saab on the 99 Turbo engine, and made by Bosch, as a means of STOPPING turbo noise, which was deemed inappropriate for owners of cars who didn't know what a turbo engine may, or should, sound like, and inappropriate for a refined car without real sports car pretensions. Urban myth has given them magical qualities, mainly of reduced lag, and that running without one will kill the turbo. Turbo Dynamics, Turbo Technics, BBR and others all agree, not to mention that I feel it safe to say that if these myths had foundation F1, IMSA, Porsche and AER would have put a tuppeny bit, and lightweight valve on their engines! I'm convinced Another bit of useless tat coming out of the engine bay this weekend Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2009 Share Posted June 3, 2009 Le Mans cars had to run for over 24 hours at race speeds, so anything that gave the turbos an easier time would be used, especially something small, light and simple. Anything that reduced lag would be used. They weren't, so I have to let the end user decide. It's hardly costly to renew, so if anyon'e uncomfortable just renew the stock one, although in all the years I have worked on the MKIV TT I have seen exactly *ONE* that was leaky or faulty. Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted June 3, 2009 Author Share Posted June 3, 2009 I think chris has made a big point hear, I agree with what he has said , one more porblem is making my supra chatter lol Quote Link to comment Share on other sites More sharing options...
Kirk Posted June 3, 2009 Share Posted June 3, 2009 my understanding was always that BOVS were designed to relieve the intake system after the throttle plate closes not for sound depression. I couldnt justify removing it from the system entirely, i mean wheres the air thats in the pipes going to go except backwards out the way it came, through the turbos, causing the blades to slow down which in term causes lag as they have to spin back up again plus all that air going back out cant be good for the turbos at all surely?? Quote Link to comment Share on other sites More sharing options...
Scott Posted June 3, 2009 Share Posted June 3, 2009 my understanding was always that BOVS were designed to relieve the intake system after the throttle plate closes not for sound depression. I couldnt justify removing it from the system entirely, i mean wheres the air thats in the pipes going to go except backwards out the way it came, through the turbos, causing the blades to slow down which in term causes lag as they have to spin back up again plus all that air going back out cant be good for the turbos at all surely?? Thats always been the assumption but i guess the lack of load in the engine means that there isn't enough back pressure for it to matter. It would be an issue with high boost levels though, again just my opinion. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted June 4, 2009 Share Posted June 4, 2009 I think he was referring to the vent to atmosphere ones lol. I did indeed mean the vent to atmosphere ones. Think the main thing with a BOV on something thats not putting out a vast amount of volume and pressure is that the impetus that is already spinning the turbo can compress the gasses just enough so that the "stall" on the turbine is negligable. Also obviously the bigger the turbine the greater the effect back pressure will have due to the area of the turbine. Would be interesting to know at what size there is a positive benefit from utilizing a BOV Quote Link to comment Share on other sites More sharing options...
supradriver Posted June 9, 2009 Share Posted June 9, 2009 i took mine off today, sounds grate... chattering away, no problems as of yet. Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted June 9, 2009 Author Share Posted June 9, 2009 Have you removed it completly or took it off at one side ? What have you used to block the ends up ? Quote Link to comment Share on other sites More sharing options...
supradriver Posted June 10, 2009 Share Posted June 10, 2009 i will show you saturday, but it sounds brill i took it completly off Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted June 10, 2009 Author Share Posted June 10, 2009 nice one what do I need to block the ends up I will bring it with me and do it Saturday so I can listen to her on way home Quote Link to comment Share on other sites More sharing options...
supradriver Posted June 10, 2009 Share Posted June 10, 2009 walking stick bottoms (the rubber bit lol) Quote Link to comment Share on other sites More sharing options...
mawby Posted June 10, 2009 Share Posted June 10, 2009 walking stick bottoms (the rubber bit lol)Not the first time I've heard that. What we need now is a sound clip of it sounding amazing. Quote Link to comment Share on other sites More sharing options...
legendswraith Posted June 10, 2009 Share Posted June 10, 2009 there is also a company called component force who do lots of EPMD rubber caps and they send free samples Quote Link to comment Share on other sites More sharing options...
j1mb0b1 Posted June 10, 2009 Author Share Posted June 10, 2009 Right o I will go and find myself a granny to mug LOL Quote Link to comment Share on other sites More sharing options...
Scott Posted June 21, 2009 Share Posted June 21, 2009 Took mine off the other day and it was rubbish. Made a tiny tiny bit of chatter but couldn't hear it in the car. With the induction kit it made a quiet BOV noise with the air coming back out the filter. Quote Link to comment Share on other sites More sharing options...
supradriver Posted June 21, 2009 Share Posted June 21, 2009 mine is well cool im going to try get a vid up Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted June 22, 2009 Share Posted June 22, 2009 I see someone has put a link to this thread on supraforums and they don't seem to be sold on the idea, allthough someone did comment that orido's supra doesn't run a bov so that would suggest there's something in it, even at single turbo level. Quote Link to comment Share on other sites More sharing options...
mikeyb10supra Posted June 22, 2009 Share Posted June 22, 2009 I see someone has put a link to this thread on supraforums and they don't seem to be sold on the idea, allthough someone did comment that orido's supra doesn't run a bov so that would suggest there's something in it, even at single turbo level. Linky poos please:innocent: Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted June 22, 2009 Share Posted June 22, 2009 Linky poos please:innocent: Sorry, didn't think to add one before. Here you go. http://www.supraforums.com/forum/showthread.php?t=545860 Quote Link to comment Share on other sites More sharing options...
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