FOSTA Posted September 22, 2015 Share Posted September 22, 2015 what blow off valves are you single turbo guys and gals running? Quote Link to comment Share on other sites More sharing options...
Batmax Posted September 22, 2015 Share Posted September 22, 2015 Tial ,soon for sale Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 22, 2015 Share Posted September 22, 2015 Don't run one, not needed. Quote Link to comment Share on other sites More sharing options...
Kaan W Posted September 22, 2015 Share Posted September 22, 2015 Don't run one, not needed. Crazy! I use a turbosmart raceport, not so much noise but expels the air quickly. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 23, 2015 Share Posted September 23, 2015 Why is it crazy? Its been widely covered on here, a bov is not required, plus they sound terrible as well. Quote Link to comment Share on other sites More sharing options...
V8KILR Posted September 23, 2015 Share Posted September 23, 2015 Crazy! I use a turbosmart raceport, not so much noise but expels the air quickly. Same. Works great. Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted September 23, 2015 Share Posted September 23, 2015 waaaaa? Everyone needs a little woosh in there lifes lol I use the HKS BOV with a purple insert Quote Link to comment Share on other sites More sharing options...
Kaan W Posted September 23, 2015 Share Posted September 23, 2015 Why is it crazy? Its been widely covered on here, a bov is not required, plus they sound terrible as well. Stalling the compressor for the sake of a few quid. Quote Link to comment Share on other sites More sharing options...
ATB Posted September 23, 2015 Share Posted September 23, 2015 Without a BOV doesn't the air go back into the turbo again? And that for sure is not good. Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted September 23, 2015 Share Posted September 23, 2015 (edited) IIRC below is something A Wise Man had to say on the subject of the use of BOVs. There's a vast amount of rubbish talked about blow off valves. They were designed to stop customers complaining of "funny noises" on early turbo cars, they do nothing to aid spool, can be unreliable, add weight and complexity, and are now used to do the exact opposite of their original purpose. That is they are now used to make silly noises, a mechanical means of shouting "I have a big one" from under the engine cover of the car. (IMHO). To say they stop shock loadings is also incorrect. If they aided spool and added turbo reliability every turbo charged 24 hour Le Mans prototype, and every F1 engine in the turbo era would have had one. The fact is, none did.... Maybe all the drivers were supremely endowed? In the F1 era turbos often didn't last a single race, so if a simple BOV would help them live longer, what do you reckon they'd have fitted? Le Mans is won or lost on reliability, to a large extent. Again, a simple BOV would be fitted if it gained reliability. Honestly, a lot of the stuff on the net is garbage on this subject. If I/C's are splitting and pipes blowing off it's more down to unsuitable I/C's and piping systems being used than no blow off valves, per se. If you DO choose to believe they help spool then you would certainly need a recirculating BOV achieve any hope of this. A proper intercooler designed for the higher boost pressures will not split, nor will pipework joined by proper Adel Wiggins fittings blow off. Edited September 23, 2015 by Frank Bullitt (see edit history) Quote Link to comment Share on other sites More sharing options...
MattP Posted September 23, 2015 Share Posted September 23, 2015 Long Silence..... Quote Link to comment Share on other sites More sharing options...
Sukhy Posted September 23, 2015 Share Posted September 23, 2015 The only reason I would run a BOV would be to protect the ceramic turbos. Once the steels are installed, the BOV is going in the bin. Never ran one on my previous S14a running 400hp and it was fine for for years when I owned it. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 23, 2015 Share Posted September 23, 2015 Long Silence..... Haha - - - Updated - - - The only reason I would run a BOV would be to protect the ceramic turbos. First post says single turbo guys Quote Link to comment Share on other sites More sharing options...
Kaan W Posted September 23, 2015 Share Posted September 23, 2015 I've said my bit, just my opinion. Quote Link to comment Share on other sites More sharing options...
JackyBoi Posted September 23, 2015 Share Posted September 23, 2015 Oh no not this debate again... Anything above 1.5 bar it is 'recommended' to have a BOV but in reality not having one would only ever damage your turbos if they were ceramic (or otherwise weak) or you were running crazy high boost Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted September 23, 2015 Share Posted September 23, 2015 I probably wouldn't run one on a single either, it's just something else to go wrong. Quote Link to comment Share on other sites More sharing options...
V8KILR Posted September 23, 2015 Share Posted September 23, 2015 The chance of damaging your turbo without a BOV is pretty low, but can occasionally happen The main reason I run one is for speed of boost recovery on gear changes. When drag racing, with the plain bearing turbos I run, it makes a huge difference to how fast the boost recovers. With ball bearing turbos it is probably needed less, but would still help. On the street you would be hard pressed to tell the difference. Quote Link to comment Share on other sites More sharing options...
cashpoint Posted September 23, 2015 Share Posted September 23, 2015 Since I sold my Supra I usually just lurk here but. I was on the don't need a BOV side. Until recently My FD had a GT4088 Turbo without a BOV. Started to have compression issue and found both rotarys were low on compression. When it went to be rebuilt the turbo was inspected an there was a large amount of play in the shaft. It was possible to move the compressor wheel about 5mm back and forth in the housing so the wheel was hitting the housing. Once the turbo was off and the housing removed both compressor wheel was missing about 1mm of metal and the housing had 1/2mm of metal missing. There were tiny shards of metal in the intercooler and pipes all the way to the throttle. So as the engine had only done 4500 miles since it was rebuilt it appears as if the compression had been lost due to the sharks getting into the engine The Compressor wheel had unscrewed itself, I was running 1.4Bar and the only way for it to unscrew would be compressor surge. So now I'm in the need a BOV camp Quote Link to comment Share on other sites More sharing options...
FOSTA Posted September 23, 2015 Author Share Posted September 23, 2015 Yeah I'm running 1.55bar. Think I'd rather just get one as if something did go wrong with the turbo I'd just keep thinking "I wounder if that's because I didn't run a BOV!" Quote Link to comment Share on other sites More sharing options...
V8KILR Posted September 24, 2015 Share Posted September 24, 2015 Yeah I'm running 1.55bar. Think I'd rather just get one as if something did go wrong with the turbo I'd just keep thinking "I wounder if that's because I didn't run a BOV!" Good plan. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted September 24, 2015 Share Posted September 24, 2015 I would love to remove the one off my BPU Jspec TT , they sound stupid and just something to go wrong Quote Link to comment Share on other sites More sharing options...
MadMax2042 Posted September 24, 2015 Share Posted September 24, 2015 I would love to remove the one off my BPU Jspec TT , they sound stupid and just something to go wrong I think they sound great pm me some details if you want to swap someone pipe work back to standard as I am looking for loud noisy whhhhhhaaaachtssaaaaa! of a BOV Quote Link to comment Share on other sites More sharing options...
Sukhy Posted September 24, 2015 Share Posted September 24, 2015 First post says single turbo guys I know but unless they are going to run a big single ceramic turbo , they won't really need one. Quote Link to comment Share on other sites More sharing options...
marc_p Posted September 24, 2015 Share Posted September 24, 2015 I think they sound terrible, personally would never run one and if you have a turbo with an anti-surge housing, then their is especially zero need for one. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 24, 2015 Share Posted September 24, 2015 Since I sold my Supra I usually just lurk here but. I was on the don't need a BOV side. Until recently My FD had a GT4088 Turbo without a BOV. Started to have compression issue and found both rotarys were low on compression. When it went to be rebuilt the turbo was inspected an there was a large amount of play in the shaft. It was possible to move the compressor wheel about 5mm back and forth in the housing so the wheel was hitting the housing. Once the turbo was off and the housing removed both compressor wheel was missing about 1mm of metal and the housing had 1/2mm of metal missing. There were tiny shards of metal in the intercooler and pipes all the way to the throttle. So as the engine had only done 4500 miles since it was rebuilt it appears as if the compression had been lost due to the sharks getting into the engine The Compressor wheel had unscrewed itself, I was running 1.4Bar and the only way for it to unscrew would be compressor surge. So now I'm in the need a BOV camp Ill bet that was down to poor assembly/fitting rather than anything to do with a dump valve. Quote Link to comment Share on other sites More sharing options...
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