Jake Posted April 4, 2004 Share Posted April 4, 2004 and how concerned should I be that it seems to be leaking? (see attached pic) Thanks Quote Link to comment Share on other sites More sharing options...
michael Posted April 4, 2004 Share Posted April 4, 2004 That's your BOV - looks awfully similar to my recent problems - I'd be pretty sure the inside of the BOV will be clean like mine was, the grime seems to come from the area underneath - possible turbo oil seal failure, when I removed mine there was a lot of play in the shafts too More photos here - are you getting any smoke? (fingers crossed that I'm way off the mark here!) Quote Link to comment Share on other sites More sharing options...
Jake Posted April 4, 2004 Author Share Posted April 4, 2004 Originally posted by mcanny That's your BOV - looks awfully similar to my recent problems - I'd be pretty sure the inside of the BOV will be clean like mine was, the grime seems to come from the area underneath - possible turbo oil seal failure, when I removed mine there was a lot of play in the shafts too More photos here - are you getting any smoke? I've just been and had another look. There doesn't seem to be any other muck like that on any other parts. Nothing like this pic of yours. The car does make white smoke when it's cold, it always has done in the year that I've owned it. I had put this down to worn Valve Stem Seals. I don't understand what you mean about "the grime seems to come from the area underneath" I can't see how that could happen, there's a big heatshield between the BOV and the turbos. What am I looking for if I take the BOV off? Quote Link to comment Share on other sites More sharing options...
michael Posted April 4, 2004 Share Posted April 4, 2004 The white smoke you mention shouldn't be an issue, sounds more like condensation - if it smokes once warm them maybe it's the valve stem seals but otherwise I reckon you are OK there - mine smoked when I came to a stop, basically a small amount of oil getting through the turbo oil seals when there was no backpressure and then getting burnt off when the AC kicked in and upped the idle. I couldn't suss where the oil was coming from at all - the BOV was clean, the pipes around it has a light film of oil on them but nothing out of the ordinary IMO. The only thing I could think was that it was coming up from below the heatshield and being drawn out in the air flow or something... maybe unlikely, I'm just guessing I presumed that area of the engine bay was some kind of air vortex and oil was being drawn up from around the turbos and then setting on the bov before dripping down when the car stopped - all flawed theory If you take the BOV off the first thing to look for is if it's full of oil, obviously if it's clean it's unlikely the oil is coming from within. People were kind enough to post some diagnostics tips in this thread - that might help you a bit. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 4, 2004 Author Share Posted April 4, 2004 Thanks Michael. I'll read that thread in a mo. I've been preparing the GF all afternoon for another impending big spend : ) Quote Link to comment Share on other sites More sharing options...
dude Posted April 4, 2004 Share Posted April 4, 2004 Originally posted by Jake Thanks Michael. I'll read that thread in a mo. I've been preparing the GF all afternoon for another impending big spend : ) Jake what was the result of the compression test i did for you , do you still have the numbers ???? dude:flame Dev Quote Link to comment Share on other sites More sharing options...
Jake Posted April 4, 2004 Author Share Posted April 4, 2004 Originally posted by dude Jake what was the result of the compression test i did for you , do you still have the numbers ???? It's here somewhere, IIRC they were all in the 165 to - 190 range. What would poor compression have to do with this leak though mate? Quote Link to comment Share on other sites More sharing options...
matt Posted April 4, 2004 Share Posted April 4, 2004 I'd guess that the pipes have gone brittle and the lil bit of oil from the breather is seeping out New pipes will sort it Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 (In another thread) eyefi said: to test the stock bov:- take it off the car and take off big hoses, leave the thin one on. blow through it, if u can its fucked. this wont b the case with u, cos u r seeing good boost. apply vacuum (a syringe is useful for this, i have one that will apply 0.5 bar vac) to the little hose and u should b able to blow through the big hole. Is this correct? I've taken my std BOV off the car and I can blow through it easily. I find this odd because car makes good boost (1.25 bar then it hits fuel cut) I tried sucking on the small pipe and I can feel and hear what sounds like a diaphram moving up and closing very quickly when I release the vacuum. Any thoughts? Quote Link to comment Share on other sites More sharing options...
dude Posted April 5, 2004 Share Posted April 5, 2004 Originally posted by Jake It's here somewhere, IIRC they were all in the 165 to - 190 range. What would poor compression have to do with this leak though mate? Just trying to rule out oil in the BOV and pipes due to excess worn rings !!! Dude:flame Dev Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 5, 2004 Share Posted April 5, 2004 Originally posted by Jake Is this correct? I've taken my std BOV off the car and I can blow through it easily. I find this odd because car makes good boost (1.25 bar then it hits fuel cut) Any thoughts? Yep the BOV has gone, happened on my MKIII Turbo when I upped the boost. It won't effect your boost, that's why you are still hitting 1.25 bar. I very much doubt a stock BOV could take 1.25 bar for long. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Originally posted by Andrew Yep the BOV has gone, I very much doubt a stock BOV could take 1.25 bar for long. OK thanks. So does this mean I need to replace it? Like I said the car is still boosting OK. -- Jake (Doesn't really know what a BOV is for) Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Originally posted by dude Just trying to rule out oil in the BOV and pipes due to excess worn rings ! I see. Well there wasn't any oil inside the BOV at all when I took it off. It's spotless inside. I'm still wondering where that oil grime came from though. Quote Link to comment Share on other sites More sharing options...
dude Posted April 5, 2004 Share Posted April 5, 2004 Originally posted by Jake OK thanks. So does this mean I need to replace it? Like I said the car is still boosting OK. -- Jake (Doesn't really know what a BOV is for) Good chance for more MODS dude !!!! Dude:flame Dev Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Like what? I don't want one of those wanky BOVs that make your car sound like a bus when it's braking. Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 5, 2004 Share Posted April 5, 2004 Originally posted by Jake Like what? I don't want one of those wanky BOVs that make your car sound like a bus when it's braking. LOL, come on Jake you know you want one To be honest mate, I think you may need to upgrade to an aftermarket bov. I think another stock bov will break again at 1.25 bar. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 But do I need one? My car is suffering no loss of boost with the BOV like it is. According to what Eyefi said (in that other thread) it shouldn't do. I just don't understand. Can any of the Techy guys explain to me if and why I need a new BOV? Thanks Quote Link to comment Share on other sites More sharing options...
Timwildman Posted April 5, 2004 Share Posted April 5, 2004 I'm not techie but as I understand it: The BOV just lets turbo pressure out between gear change, so the turbo doen't stall. also supposed to give quicker responce. So as you let off the go faster pedal, the BOV opens and still lets the turbo spin. Joining the compressor out side of the turbo, to the exhaust out let. So turbo spins freely instead of it being restricted of even reversed by the engine. Waiting to be shot down in flames......... Quote Link to comment Share on other sites More sharing options...
dude Posted April 5, 2004 Share Posted April 5, 2004 100,000 RPM to Zero RPM = not good !!!! Dude:flame Dev you can get a quiet one but think of it like a woman .... who'd want one ???? Quote Link to comment Share on other sites More sharing options...
michael Posted April 5, 2004 Share Posted April 5, 2004 Originally posted by Jake Like what? I don't want one of those wanky BOVs that make your car sound like a bus when it's braking. Click here - a few BOVs that recirc like the standard one. Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 5, 2004 Share Posted April 5, 2004 Exactly what Tim said You can fit a SAAB Bosch BOV which is better than the stock supra BOV, lots of MKIII owners did this. Can be bought from a SAAB dealer, I paid about £35 for mine about 4 years ago. This was on a MKIII turbo so not sure how it would fair on a MKIV. Personally I'd fit an aftermarket, I have an HKS SQV. If you are going to run high boost like 1.25 bar, you have to take other things into consideration. Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 5, 2004 Share Posted April 5, 2004 Jake, my stock BOV has been dealing with 1.3 to 1.4 (and sometimes a bit higher) bar of boost all it's life and it's peachy. Get another stock one. Check with Brian Duff and Hisupe et al for spares. Then see if the new one gets grimed up and where. -Ian Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Thanks for the replies I don't think anyone has explained why my car makes good boost with a knackered BOV when Eyefi said it couldn't be a faulty BOV if you were seeing good boost. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Originally posted by mcanny Click here - a few BOVs that recirc like the standard one. Thanks mate, but I'm NOT paying ~£200 for a BOV. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 5, 2004 Author Share Posted April 5, 2004 Originally posted by Andrew You can fit a SAAB Bosch BOV which is better than the stock supra BOV, lots of MKIII owners did this. Can be bought from a SAAB dealer, I paid about £35 for mine about 4 years ago. This was on a MKIII turbo so not sure how it would fair on a MKIV. Like this one : http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2470869813&category=10416 I wonder if it'd work OK on a MKiv Quote Link to comment Share on other sites More sharing options...
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