Grudgee Every Mod's Favourite Member Member 1,496 Member For: 16y 11m 9d Gender: Male Location: Melbourne Posted 11/08/08 11:17 AM Share Posted 11/08/08 11:17 AM I heard that the charged air is forced back onto the turbo coz it has no way of escaping as there is no BOV.I heard something along these lines too. Where's someone credible to confirm. Link to comment Share on other sites More sharing options...
ETM Member 1,194 Member For: 17y 11m 1d Gender: Male Location: syd south Posted 11/08/08 11:22 AM Share Posted 11/08/08 11:22 AM Its true, the air is forced back through the turbo and will stop the turbo from spining, imagine the shaft spinning and then stopping then starting again everytime you back off, if you think that doesnt cause undue stress/friction etc on the turbo then you are not very scientific Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 7d Gender: Male Location: SW Sydney Posted 11/08/08 11:24 AM Share Posted 11/08/08 11:24 AM This is probably the longest running debate in the history of turbochargers...On older bush bearing type turbos and plain bearing turbos this was more of a problem because they weren't as sturdy as the newer ball-bearing turbos that we have in our cars. It also relates to how much boost you are running over a period of time. If you run your car hard and boost right up and the turbo practically stops, this can eventually cause damage. I haven't been running a BOV for a while and my turbo is still in good nick, basically the same play in the shaft from factory (which is bugger all) Link to comment Share on other sites More sharing options...
Maximus Member 1,627 Member For: 17y 11m 3d Gender: Male Location: Slip Sliding Away Posted 11/08/08 11:28 AM Share Posted 11/08/08 11:28 AM Its true, the air is forced back through the turbo and will stop the turbo from spining, imagine the shaft spinning and then stopping then starting again everytime you back off, if you think that doesnt cause undue stress/friction etc on the turbo then you are not very scientific Why would the air be FORCED BACK THROUGH the turbo???It only SLOWS the turbo from spinning and doesn't cause it to stop.I know this will start another arguement on this but only causes the turbo to slow down, not stop or spin the other way. Link to comment Share on other sites More sharing options...
CJ_AK cj_ak Donating Members 5,077 Member For: 17y 7m 14d Gender: Male Location: Ropes Crossing Posted 11/08/08 11:36 AM Author Share Posted 11/08/08 11:36 AM Sounds like theres no clear answer on this subject.I have heard heaps of guys tell me the same thing senna has said. but then there is almost the same amount of guys that is against the idea of no BOV to allow air to escape. Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 20d Gender: Male Location: Brisbane Posted 11/08/08 11:38 AM Share Posted 11/08/08 11:38 AM Why would the air be FORCED BACK THROUGH the turbo???It only SLOWS the turbo from spinning and doesn't cause it to stop.I know this will start another arguement on this but only causes the turbo to slow down, not stop or spin the other way.lol....where does the boosted air go when the throttle is shut then? Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 7d Gender: Male Location: SW Sydney Posted 11/08/08 11:41 AM Share Posted 11/08/08 11:41 AM Why would the air be FORCED BACK THROUGH the turbo???It only SLOWS the turbo from spinning and doesn't cause it to stop.I know this will start another arguement on this but only causes the turbo to slow down, not stop or spin the other way.That is exactly the problem, the turbo is still being driven "forward" on the exhaust side, so when the throttle closes and the pressure build up between the turbo and throttle body forces its way "backwards" against the turbo and slows the compressor opposite to the way it wants to spin Link to comment Share on other sites More sharing options...
CJ_AK cj_ak Donating Members 5,077 Member For: 17y 7m 14d Gender: Male Location: Ropes Crossing Posted 11/08/08 11:49 AM Author Share Posted 11/08/08 11:49 AM OK now its all making some sense to me.However, based on this information that, 'the turbo and slows the compressor opposite to the way it wants to spin', would that affect the performance or the longevity of the turbo?? Link to comment Share on other sites More sharing options...
Grudgee Every Mod's Favourite Member Member 1,496 Member For: 16y 11m 9d Gender: Male Location: Melbourne Posted 11/08/08 11:52 AM Share Posted 11/08/08 11:52 AM I'd wager it would. Tab and Senna are both halfwits, but I think they've nailed it here. Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 7d Gender: Male Location: SW Sydney Posted 11/08/08 11:53 AM Share Posted 11/08/08 11:53 AM after a good amount of time, most probably. But there are plenty of guys running no BOV with no probs. As I said, I've been running no BOV for about 6-7months and recently had my turbo off, no dramas to speak of Link to comment Share on other sites More sharing options...
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