berg Posted November 22, 2016 Share Posted November 22, 2016 Sold Link to comment Share on other sites More sharing options...
Nodalmighty Posted November 22, 2016 Share Posted November 22, 2016 Your definitely not a sales person Link to comment Share on other sites More sharing options...
berg Posted November 22, 2016 Author Share Posted November 22, 2016 Your definitely not a sales person ?? Link to comment Share on other sites More sharing options...
Big Mark Posted November 22, 2016 Share Posted November 22, 2016 Ha Ha. Glad I chose not to add a BOV to my turbo kit spec. Told you it sounded good. :-) Link to comment Share on other sites More sharing options...
berg Posted November 22, 2016 Author Share Posted November 22, 2016 To be honest i ran no bov on the stock twins and it sounded crap thats why i bought this valve But on the precision its a different story Still this is the best sounding bov on the market in my opinion, i think i understand your comment now Nodalmightly Link to comment Share on other sites More sharing options...
Nodalmighty Posted November 22, 2016 Share Posted November 22, 2016 Link to comment Share on other sites More sharing options...
JackyBoi Posted November 22, 2016 Share Posted November 22, 2016 I swear having no BOV means huge compressor surge which is bad for the turbo and massively reduces its lifespan? Link to comment Share on other sites More sharing options...
Mk4Gaz Posted November 22, 2016 Share Posted November 22, 2016 Compressor surge is a completely different phenomenon to the 'chatter' noise you hear, by running without a bov There's lots of myths floating around the Internet, but no concrete evidence that it reduces the lifespan of the turbo. Link to comment Share on other sites More sharing options...
Nodalmighty Posted November 22, 2016 Share Posted November 22, 2016 I swear having no BOV means huge compressor surge which is bad for the turbo and massively reduces its lifespan? No BOV's go Pppssttt! and that is only because someone thought it would be a good idea to NOT re-circulate the air back into the induction system. I believe originally it was used by Cosworth as a way of stopping the noise of compressor surge as Ford wouldn't clear the car for production making a noise that sounded like it was broken. I think CW know the story better than I. Link to comment Share on other sites More sharing options...
Style Posted November 22, 2016 Share Posted November 22, 2016 Compressor surge is a completely different phenomenon to the 'chatter' noise you hear, by running without a bov There's lots of myths floating around the Internet, but no concrete evidence that it reduces the lifespan of the turbo. /QUOTE] Compressor surge is the chatter noise you hear mate. My thoughts is that BOV's can't open quickly enough to prevent the initial shock on the turbo. Once the BOV opens, the damage (if any) is already done. Link to comment Share on other sites More sharing options...
Mk4Gaz Posted November 22, 2016 Share Posted November 22, 2016 Compressor surge is when the compressor map is out of its efficiency range, and you have a higher pressure behind the compressor wheel, than the turbo can actually produce. If you hear that 'chatter' noise, whilst on boost, then it's bad news. The noise you hear by not running a bov, is pressurised air crossing back over the compressor blades, after the throttle body has been shut. This will not harm the turbo Link to comment Share on other sites More sharing options...
JackyBoi Posted November 22, 2016 Share Posted November 22, 2016 Compressor surge is when the compressor map is out of its efficiency range, and you have a higher pressure behind the compressor wheel, than the turbo can actually produce. If you hear that 'chatter' noise, whilst on boost, then it's bad news. The noise you hear by not running a bov, is pressurised air crossing back over the compressor blades, after the throttle body has been shut. This will not harm the turbo /QUOTE] Yeah exactly. Pressurised air hitting the compressor blades which are moving in excess of 150,000rpm in the wrong direction is surely gonna cause some form of wear, even if minimal. I'm not convinced personally. I'll always run a BOV! Link to comment Share on other sites More sharing options...
np89 Posted November 22, 2016 Share Posted November 22, 2016 Yeah exactly. Pressurised air hitting the compressor blades which are moving in excess of 150,000rpm in the wrong direction is surely gonna cause some form of wear, even if minimal. I'm not convinced personally. I'll always run a BOV! He wont have that problem with the precision ported cover anyway. Diverts any surge around the blades Link to comment Share on other sites More sharing options...
Mk4Gaz Posted November 22, 2016 Share Posted November 22, 2016 Nah, there's actually no evidence that it causes any harm. I actually still run a bov, but it's coming off over Christmas, whilst I'm working on the car ready for next spring Link to comment Share on other sites More sharing options...
berg Posted November 22, 2016 Author Share Posted November 22, 2016 Yeah exactly. Pressurised air hitting the compressor blades which are moving in excess of 150,000rpm in the wrong direction is surely gonna cause some form of wear, even if minimal. I'm not convinced personally. I'll always run a BOV! Yet you run antilag? Lol Link to comment Share on other sites More sharing options...
JackyBoi Posted November 22, 2016 Share Posted November 22, 2016 Yet you run antilag? Lol What the hell has that got to do with anything? Lol Link to comment Share on other sites More sharing options...
berg Posted November 22, 2016 Author Share Posted November 22, 2016 Youre saying you will always run with a bov because the internet says it will some how nacker your turbo Yet you use anti lag Just saying Link to comment Share on other sites More sharing options...
JackyBoi Posted November 22, 2016 Share Posted November 22, 2016 Youre saying you will always run with a bov because the internet says it will some how nacker your turbo Yet you use anti lag Just saying Cool Link to comment Share on other sites More sharing options...
Chris Bailey Posted November 22, 2016 Share Posted November 22, 2016 Well that escalated quickly... Link to comment Share on other sites More sharing options...
JackyBoi Posted November 22, 2016 Share Posted November 22, 2016 Sorry Berg, I'm cranky this evening, not an excuse though. I had antilag removed from my cal switch after reading into it a bit more. As for BOV vs no BOV, internet speculation aside, I think it's purely personal preference. In my mind anything that isn't good is bad, and since compressor surge isn't exactly 'good' I think of it as bad. But that's just me. Sorry for being an arse on your post Link to comment Share on other sites More sharing options...
X13mgr Posted November 22, 2016 Share Posted November 22, 2016 Forums bin quiet recently. Love a good debate Pppuuuuussssttttttttuuutttuuuuttuuuu Link to comment Share on other sites More sharing options...
Style Posted November 22, 2016 Share Posted November 22, 2016 Compressor surge is when the compressor map is out of its efficiency range, and you have a higher pressure behind the compressor wheel, than the turbo can actually produce. If you hear that 'chatter' noise, whilst on boost, then it's bad news. The noise you hear by not running a bov, is pressurised air crossing back over the compressor blades, after the throttle body has been shut. This will not harm the turbo /QUOTE] Have you not described the same thing twice there though? A greater pressure differential behind the turbo than there is in front of it in both scenarios resulting in the air taking the path of least resistance out through the turbo and making the chatter noise. A surge of air from no BOV is surely more apt than it slowly building up to a dead head when on boost? Would that not be more like compressor stall? Ps sorry for the thread hijack Link to comment Share on other sites More sharing options...
berg Posted November 22, 2016 Author Share Posted November 22, 2016 Well, someone has managed to find an item for sale somewhere in this thread so its prov sold I feel ive helped save someones turbo here I love a bit of banter Mods can move this to supra chat now i guess Link to comment Share on other sites More sharing options...
Mk4Gaz Posted November 22, 2016 Share Posted November 22, 2016 Have you not described the same thing twice there though? A greater pressure differential behind the turbo than there is in front of it in both scenarios resulting in the air taking the path of least resistance out through the turbo and making the chatter noise. A surge of air from no BOV is surely more apt than it slowly building up to a dead head when on boost? Would that not be more like compressor stall? Ps sorry for the thread hijack Not exactly Compressor surge, is on boost, when the turbo is out of spec. So it's trying to push more boost than the engine can absorb, so the boost pressure is forced back out through the turbo. When you get the chatter through no bov, when the throttle is closed, it's the pressurised air between the turbo outlet and throttle body that travels back out to the air filter. As the air rushes past the face of the compressor wheel, it makes the 'chatter' noise. Link to comment Share on other sites More sharing options...
Sheefa Posted November 22, 2016 Share Posted November 22, 2016 The turbo flutter noise is NOT compressor surge. It is perfectly safe. This is compressor surge which is entirely different. Running no BOV is not an issue and you'll see negligible difference in spool etc Link to comment Share on other sites More sharing options...
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