JamieP Posted October 8, 2008 Share Posted October 8, 2008 (edited) EDIT... I MEAN COMPRESSOR STALL, thanks Wez. Only since watching a video of my car on track have i noticed im getting a lot of this with my T67 setup, i run a Tial 50mm bov turbo side down in the bumper. Is it anything to worry about? Will it damage my turbo? Should i fit an extra BOV? Regards Jamie:) Edited October 8, 2008 by JamieP (see edit history) Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 8, 2008 Share Posted October 8, 2008 (edited) It won't damage you're turbo, I'm surprised you're getting stall with a 50mm BOV, what boost are you running? i don't get any with my setup, with fake Tial 50mm. Edited October 9, 2008 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 8, 2008 Author Share Posted October 8, 2008 1.6 bar, the red car had the same setup but never run that at more than 1.2bar and no surge. If its not going to damage it then i wont bother with another bov. Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 8, 2008 Share Posted October 8, 2008 (edited) 2nd one isn't needed. I wouldn't worry bout stall with a 50mm Although there's always the argument bout where the best place to mount them is, just after the turbo or just before the intake manifold... Posted via Mobile Device Edited October 8, 2008 by Kirk (see edit history) Quote Link to comment Share on other sites More sharing options...
Wez Posted October 8, 2008 Share Posted October 8, 2008 Compressor surge or stall? Surge is during spool up, it basically means the turbo is producing more air than the engine can take. Compressor stall is on lift off and sounds like a flutter, this is when the pressure generated has no where to go but back through the turbo the wrong way, hence stalling. Balancing a BOV spring to hold high boost and vent very little boost is a nightmare which is why you normally get stall on light driving lift off. If you are getting stall on high boost lift off then either the BOV is not man enough or the spring is too strong to open enough. Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 8, 2008 Author Share Posted October 8, 2008 Ahh in that case its "Stall" 11psi spring in the bov and i dont think it gets it at full revs, its if i let off lower in the rev range. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 8, 2008 Share Posted October 8, 2008 Compressor surge or stall? Surge is during spool up, it basically means the turbo is producing more air than the engine can take. Compressor stall is on lift off and sounds like a flutter, this is when the pressure generated has no where to go but back through the turbo the wrong way, hence stalling. Balancing a BOV spring to hold high boost and vent very little boost is a nightmare which is why you normally get stall on light driving lift off. If you are getting stall on high boost lift off then either the BOV is not man enough or the spring is too strong to open enough. LOL! he even had me at it, i was sure it was stall he was talking about, so i guess i didn't read it properly:innocent: Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 8, 2008 Share Posted October 8, 2008 Join the club! Although its getting late so can use fatigue as an excuse! Posted via Mobile Device Quote Link to comment Share on other sites More sharing options...
Homer Posted October 8, 2008 Share Posted October 8, 2008 Jamie, as mentioned on one of your youtube comments the sound is stall, not surge. It's nothing to worry about, it'll stall like a bugger under low boost lift off, but thats part and parcel of having a BOV that is set for high pressure. If you are not seeing pressure drop at WOT and high load then you can reduce the BOV spring until it starts to affect the boost hold. It'll help reduce compressor stall to the minimum your system allows, but it's pretty pointless. Edit- balls, Wez already explained it in a better way! Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 8, 2008 Author Share Posted October 8, 2008 cheers guys. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 8, 2008 Share Posted October 8, 2008 I don't run any form of BOV on high power turbo engines, and have never found turbo life or spool compromised. Several major turbo experts agree that BOV's are for noise reduction rather than turbo life increase, or spool decrease. F1 turbo engines and Indy engines never used them, nor any Group C engines, as far as I know, and some Group C / IMSA units did 24 hour races, and all would welcome less spool time. Quote Link to comment Share on other sites More sharing options...
bodilx6 Posted October 9, 2008 Share Posted October 9, 2008 Very interesting Chris. You are most probably right. It just contradicts the logical through and understanding of what is happening. How does BOV reduce noise? I would think it genrates more noise with the well known PPffftt... I'm guessing that if i block off mine, it would just make the stall sound, right? If there are no real function, why does to soop come with a by-pass type as stock? Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 9, 2008 Author Share Posted October 9, 2008 If there are no real function, why does to soop come with a by-pass type as stock? To reduce noise i presume. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 9, 2008 Share Posted October 9, 2008 Porsche and Saab started it with the 944 turbo, and the 99 turbo, their customers were not the type to want a "funny noise" when lifting off under boost, so they relieved the back pressure by re circulating back to the intake, thus stopping the noise, too. Others followed. Most used the Bosch recirculating valve still in current use today. Quote Link to comment Share on other sites More sharing options...
miko_supra Posted October 9, 2008 Share Posted October 9, 2008 Listen to the compressor stall on this Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 9, 2008 Share Posted October 9, 2008 Keep thinking Audi R8 when i look at that scooby, if the silly buggers had put that into production instead of that excuse for an Impreza that there selling now, they could have really scuppered Audi. Quote Link to comment Share on other sites More sharing options...
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