sprouly07 Legacy Donating Member 62 Member For: 12y 2m 5d Gender: Male Location: Townsville Posted 28/04/16 07:59 AM Posted 28/04/16 07:59 AM Hey guys I had been noticing a bit of a boost leak and when I put it on the dyno about a month ago was suspicions were confirmed. Would make 21pound and then fall off to 17 on the high boost tune and then with the everyday tune it would make 18 and then fall off to about 15-16. Started to investigate and found the bov was on back to front. So what would usually be the outlet was now the inlet. After changing it back to how it should be it now holds 21 pound and goes a lot better. Is there a reason why it would be leaking through because it was back to front? Or could it just be a sign that it's not that healthy and may need replacing. I can't think of a reason why it leak being installed backwards. Cheers
k31th less WHY; more WOT Site Developer 30,099 Member For: 18y 5m 8d Gender: Male Location: Melbourne Posted 28/04/16 11:19 AM Posted 28/04/16 11:19 AM what make/model of BOV is it?
Jamie_d Member 219 Member For: 11y 5m 9d Gender: Male Location: Wadalba 2259 NSW Posted 28/04/16 11:22 AM Posted 28/04/16 11:22 AM Picture of bov? Makes sense. Not made to seal with pressure on a vent port.
MattyP MattyP Legacy Donating Member 6,317 Member For: 14y 4m 14d Gender: Male Location: Central Coast Posted 28/04/16 09:25 PM Posted 28/04/16 09:25 PM Block bov /end thread 3
k31th less WHY; more WOT Site Developer 30,099 Member For: 18y 5m 8d Gender: Male Location: Melbourne Posted 28/04/16 11:46 PM Posted 28/04/16 11:46 PM Whilst I agree with this ^^, it doesn't help to answer the bloke's question - he's already resolved the leak by putting the BOV around the correct way haha 2
MattyP MattyP Legacy Donating Member 6,317 Member For: 14y 4m 14d Gender: Male Location: Central Coast Posted 29/04/16 01:56 AM Posted 29/04/16 01:56 AM Even if it was around the incorrect way blocking fixes it /end thread 1
k31th less WHY; more WOT Site Developer 30,099 Member For: 18y 5m 8d Gender: Male Location: Melbourne Posted 29/04/16 01:57 AM Posted 29/04/16 01:57 AM
sprouly07 Legacy Donating Member 62 Member For: 12y 2m 5d Gender: Male Location: Townsville Posted 29/04/16 08:59 AM Author Posted 29/04/16 08:59 AM Standard bov. I wasnt asking how to fix it. Was asking if anyone had any ideas why it was doing what it was doing. But thanks for your input.
Jamie_d Member 219 Member For: 11y 5m 9d Gender: Male Location: Wadalba 2259 NSW Posted 29/04/16 10:17 AM Posted 29/04/16 10:17 AM Search bosch bypass valve. Weird diaphragm setup in them. Might give you a visual as to why it leaks the wrong way around.
sprouly07 Legacy Donating Member 62 Member For: 12y 2m 5d Gender: Male Location: Townsville Posted 29/04/16 10:38 AM Author Posted 29/04/16 10:38 AM 16 minutes ago, Jamie_d said: Search bosch bypass valve. Weird diaphragm setup in them. Might give you a visual as to why it leaks the wrong way around. Cheers for that. In my mind I thought as long as it had the manifold pressure there it would have held closed unless there was a leak/ hole in the diaphragm. But then it would have leaked regardless of if it was installed the correct way or not.
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