Adam Kindness Posted June 15, 2002 Share Posted June 15, 2002 to anyone else with one..... do you get oil 'splatter' marks where its blown off? Quote Link to comment Share on other sites More sharing options...
Alex Posted June 15, 2002 Share Posted June 15, 2002 yes...nowt to worry about...though I believe I reduced it by tightening the nut on the back by a 1/4 turn...this nut controls the sqv's spring. To completely remove it fit a catch can. Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted June 15, 2002 Share Posted June 15, 2002 That's O.K. Depending on quanitity. If you were to remove any of the air piping around the turbos then you'd see thin film of oil. You don't really want to see great pools of oil but a covering is nothing to worry about. The best indication of anything being wrong is if you use say more that 1Lt of oil between services. Pete Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 15, 2002 Share Posted June 15, 2002 Originally posted by Alex Holdroyd yes...nowt to worry about...though I believe I reduced it by tightening the nut on the back by a 1/4 turn...this nut controls the sqv's spring. To completely remove it fit a catch can. my bltz one sprays fine oil on my pipes too does a catch can recirculate the oil and would it affect the noise of the dump valve i wished i would have got a hks bullet shaped dump valve they are loud and look smart.my mate has one on his skyline gtr. also can you fit them other places like on intercooler piping my mate has a bailey dumpvalve on his supra uk auto and it is loud,he also has his stock one in too Quote Link to comment Share on other sites More sharing options...
Alex Posted June 15, 2002 Share Posted June 15, 2002 You should remove the original if you put on an aftermarket BOV. A catch can diverts the oil which is passed into the intake to get burnt off in to an alloy can which need to then be manually emptied every so often.... I can't remeber why the oil gets circulated into the intake but I know its normal practice especially on a car running higher than stock boost. The catch can does not have anything to do with boost pressure and so cannot affect the noise of the BOV. It's interested in oil not air! You can mount the dump valve in any piece of intake piping as long as it is after the turbos and before the throttle body...most are in the pipe next to the battery or in the place of the stock one, on top of the turbo's...others have mounted them on the pipe work just before or after an FMIC as it is even louder there...no bodywork to muffle the sound! Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 15, 2002 Share Posted June 15, 2002 thanks alex somewhere near the standard intercooler location would be good just what would i do if i took my blitz off with pipework theres an end cap on part of engine next to turbos a ruber cap with jubilee clip i will probably end up keeping the blitz but would like a hks one Quote Link to comment Share on other sites More sharing options...
Branners Posted June 15, 2002 Share Posted June 15, 2002 Why would you need to remove the original BOV if fitting an aftermarket one? Most cars I have seen with the bov on the manifold pipework have left the stock one in place, which is what I had on my old Supra. JB Quote Link to comment Share on other sites More sharing options...
GavinL Posted June 15, 2002 Share Posted June 15, 2002 Originally posted by Branners Most cars I have seen with the bov on the manifold pipework have left the stock one in place, which is what I had on my old Supra. JB Insurance against failure of the aftermarket item. Quote Link to comment Share on other sites More sharing options...
Alex Posted June 15, 2002 Share Posted June 15, 2002 Originally posted by Branners Why would you need to remove the original BOV if fitting an aftermarket one? Most cars I have seen with the bov on the manifold pipework have left the stock one in place, which is what I had on my old Supra. JB Why would you have 2 BOV's in sequential/serial system?? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 15, 2002 Share Posted June 15, 2002 To handle more pressure. Quote Link to comment Share on other sites More sharing options...
Adam W Posted June 15, 2002 Share Posted June 15, 2002 Can anyone explain to me why an aftermarket BOV will go off when you rev the car at idle, but with a stock BOV, although the same boost pressure is being generated, there's not even a hint of a tickle of a whisper of a sound of a pressure release? EDIT: And would this still happen if you had the stock BOV in place? Does that then mean that whatever pressure is present in the system would "prefer" to go through the aftermarket BOV because there is less resistance there? Quote Link to comment Share on other sites More sharing options...
Alex Posted June 15, 2002 Share Posted June 15, 2002 Get a good one to start with then...pull type sqv's are very reliable...then there is the racing GT BOV.. Anyway they are both subjected to the same pressures so you just end up finding out which one was weakest....you can't have redundancy in this sort of system....if one goes tits up then you'll lose the pressure in the system...keep a spare by all means but you can't use two at anyone time. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 15, 2002 Share Posted June 15, 2002 Originally posted by Alex Holdroyd ...keep a spare by all means but you can't use two at anyone time. Plenty of people do. Quote Link to comment Share on other sites More sharing options...
Alex Posted June 16, 2002 Share Posted June 16, 2002 Originally posted by Martin F Plenty of people do. Does that mean it's right to do it??? Can't think of a logical reason to keep it.... Adam, different types of pressure relief valves react and sound differently. Is the stocker a recirculating one compared to the normal aftermarket vent to atmosphere job?? The aftermarket ones are designed to make a noise The stock one is not supposed to make an aural (sp?) impact Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted June 16, 2002 Share Posted June 16, 2002 Is there any actual performance gains with an aftermarket BOV other than the noise? Is the stock one not very good or prone to failure? I don't really want one but if they actually DO something.... Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 16, 2002 Share Posted June 16, 2002 Originally posted by Alex Holdroyd Does that mean it's right to do it??? That wasn't the quote. The fact is you CAN use two at one time. Whether it's right or wrong is another matter. I tend to agree that if you are using two then it is a fudge, you should use a properly rated one to start with. Matt - the stock ones have been known to fail when increasing the pressure. They don't seem to be quite as weak as the MKIII ones, but still can give up the ghost after a while at increased boost. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted June 16, 2002 Share Posted June 16, 2002 And what happens when they do go? - Lack of power or lack of funds to repair the engine? Any idea how much a stock one is compared to the big aftermarket ones? Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 16, 2002 Share Posted June 16, 2002 Well that depends which way it fails. If it fails open (more usual) then you will take longer to build boost, and may well see slightly less maximum boost. If it fails closed then it could cause your turbo's compressor wheel to stall when closing the throttle. In the worst case running the car for a long time this way could damage the compressor wheel of the turbo, but in reality this is quite rare. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted June 16, 2002 Share Posted June 16, 2002 Thanks Martin. Very helpful. Quote Link to comment Share on other sites More sharing options...
Terminator Posted June 16, 2002 Share Posted June 16, 2002 On MKIV.com there is a twin stock BOV mod, for running higher boost. I have two stock BOV';s but never got round to doing the plumbing. Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted June 16, 2002 Share Posted June 16, 2002 Originally posted by Terminator On MKIV.com there is a twin stock BOV mod, for running higher boost. I have two stock BOV';s but never got round to doing the plumbing. Out of interest, how much are stock BOVs? Quote Link to comment Share on other sites More sharing options...
Andrew Posted June 17, 2002 Share Posted June 17, 2002 Not sure on Toyota BOV prices but the SAAB BOVs are around £27. Most MKIII owners replace the weak stock BOV with these. Not sure how a SAAB or BOSCH BOV would stand up on the MKIV though. Quote Link to comment Share on other sites More sharing options...
rallly Posted September 4, 2012 Share Posted September 4, 2012 yes...nowt to worry about...though I believe I reduced it by tightening the nut on the back by a 1/4 turn...this nut controls the sqv's spring. To completely remove it fit a catch can. Hey Alex, I know this.thread is very old but I too just installed an HKS ssqv bov ver2 where the stocker used to be and I can see oil spraying on the intake pipe hose with every ppsssshhhhhhhh. Now I have seen the residue on the OEM bov and in the hoses but never thought it would shoot out like this. I get no smoke out the tail pipe, no excessive oil consumption... I have a catch can on order and hope this solves the issue. Can you point me in the right direction of how to install the 2 catch can lines? Car is a 93 JDM Supra tt and stock. Thanks Alex! Quote Link to comment Share on other sites More sharing options...
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