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On Probation
Location:
Hobart
Registered:
December 2004
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BOV mystery!!!
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Mon, 31 October 2005 05:00
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for strange reason all of a sudden neither of my BOVs work. I have a SSq as my main BOV but have left hte stock one in place. Anyway i was driving around the other night and for some strange reason the BOV just stopped making that big SSQ nice noise... so i checked all hte cooler pipes, they are fine, vacumn line is fine and vacumn is still running through it. i took the vacumn line off hte SSQ and put it on the stocko and still no noise... the stocko makes a distinct noise, but not even that.
I replaced a hose cause it looked a bit ratty, so thats all done, but even still now i can't work it out, i showed my mate who is a mechanic and he is stumped aswell!! anyone got any ideas.. The car idles fine and vacumn pressure is at -65kpa or less
anyone got any ideas!
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Registered:
May 2002
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Re: BOV mystery!!!
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Mon, 31 October 2005 05:31
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BOVs are not very mysterious items, they are incredibly simply.
Given that you say BOTH both of your BOVs have stopped working it is either:
None or not enough vaccuum (but you say that you have checked this already).
or
No boost or not enough boost pressure to open the BOVs.
My guesstimate would be that a pipe or something between the turbo and throttle is leaking on boost, hence no/not enough excess boost for the BOV's to vent went the throttle closes.
PS. Where do people with nice cars drive in Hobart? I was there on the weekend and only saw two (nice Toyotas) JZA80s all weekend.
I did see a lot of shitter multi coloured Geminis and such 
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 05:34
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hmm i have checked all the cooler pipes and even replaced a ose like i stated, so it would have ot be some tiny litle gap that is in a shitty spot!
Wat colour where the a80's ? i might know them! the good cars are around just not super common, and yea there are alot of multi coloured gemini's!
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Registered:
May 2002
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Re: BOV mystery!!!
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Mon, 31 October 2005 05:38
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| Quote: |
hmm i have checked all the cooler pipes and even replaced a ose like i stated, so it would have ot be some tiny litle gap that is in a shitty spot!
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It probably will be
A white and a maroon one. I also kept on seeing an orange RX7 Series 4 or 5 and lots of R32 Skylines.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 05:39
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They are a few white JZA80 and only 1 of them is a TT, dunno about a maroon one that orange RX7 is a S4 and its a guzzler aparently it gets around 250ks to $55 or something like that and yeah heaps of R32's! all GTST tho!
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 09:07
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so if the vacumn line is trying to suck my finger down it!, which might i add without a bov connected sits on about -35KPA with my finger over it sits at -58KPA with the bov on -65kpa so it seesm as if the pressure is fine wiht he bov on. So the mechanisim inside the BOV could be screwed... wat about hte fact that hte stock BOV isn't working...??
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: BOV mystery!!!
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Mon, 31 October 2005 09:23
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um your factory one works in the same way so it can have the same problems.
mick
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: BOV mystery!!!
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Mon, 31 October 2005 09:28
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| kingmick wrote on Mon, 31 October 2005 20:23 |
um your factory one works in the same way so it can have the same problems.
mick
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esp if it hasn't been connected for a while....
are you sure you haven't dropped a turbo off somewhere?
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 09:34
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yeah probably right oldrolla's so do u guys think the verdict is the fact that the bov might have seized ? cause i have seriously looked at every pipe and chiecked for problems anbd nothing! so i can only put it down to the bov, it does flutter a tiny bit!
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: BOV mystery!!!
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Mon, 31 October 2005 10:12
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BOV's don't flutter. they open.
pull it out, pat a vac source onto it.. see if the fucker opens...
use some initiative..... 
(just the littlest burnout )
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 10:15
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na i know it doesn't fluuter, but it seems to be opening a tiny bit and enhances the fltuer noise
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I Supported Toymods
Location:
Lwr Templestowe, Melbourne
Registered:
August 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 13:51
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If it opens, then you don't get the flutter noise.
I think its time to sell your car. Its giving you too many problems dude.
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Location:
Tassie
Registered:
October 2003
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Re: BOV mystery!!!
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Mon, 31 October 2005 14:13
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I told you that 100 shot of nos would blow the welds on the intake !!
but no don't listen to me.
I"m pretty sure there was some noise coming from under the bonnet just not as much as there should be.
i asked a mate he said your ssq might have a warranty ?
Will boosting cause or put the car at risk of being damaged ?
(other than nicks driving)
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Location:
Melbourne
Registered:
July 2002
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Re: BOV mystery!!!
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Mon, 31 October 2005 16:27
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First thing, ive had the same thing with pretty much all my bovs - stock, turbosmart type 2 and 3, greddy and the hks one. I just pulled the bov apart, greased/oiled/rp7/wd40 whatever lubrication you feel like, and i never had the problem again, until next time the lube wore off.
that issue aside, i see another prob from what you have described.... ? unless i have misread - which is always possible
your running both bovs? but only one of them with the vac/boost line?
umm.. without a boost line connected to your stock bov it will open up when the boost pressure on the charge pipe exceeds the spring pressure. Bovs are supposed to have boost on the diaphragm side as well to overcome the boost pressure on the charge pipe side - thus bovs recieve a boost/vac line not just the vac only line. this is especially important on stock bovs as their spring pressures are generally pretty low.
To overcome this, either remove the stock bov and blank it off, - or if you insist on leaving it on there, feed it a boost only line from the charge pipe, somewhere near the turbo. Better off removing it completely though.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Mon, 31 October 2005 23:26
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yeah good point mate i never thought of that, i was gunna grease it up today, cause i have really checked out all the pipes and vacumn is fine so yeah i think hte bov might have just gotten dirty, anyway keep u posted! thanks forh te help guys!
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Location:
Brisbane
Registered:
July 2005
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Re: BOV mystery!!!
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Tue, 01 November 2005 03:08
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If what truenoGTAPEX has said is right and you dont have a vac/boost line to your standard BOV the it will never have been working properly and is more than likely the source of your problem.
You need to really think about this i reckon... can you be sure that before the ssq failed that the factory unit was venting? Does the car feel the same now - power wise etc?
I would;
1. Pull off the factory BOV, blank the hole and see if the ssq works. (eliminates whether standard BOV has just got stuck badly enough to vent all closed throttle back pressure)
Failing that.
2. One would have to assume that both units were working, and i would say the probability of two very different BOV's both getting fouled enough to be stuck open (or closed) at exactly the same time is about as high as getting hit by a car while scuba diving. I would be doing what oldcorollas suggested and check that you havent got a turbine wheel in your cat.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Tue, 01 November 2005 06:18
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The car boosts up fine and everything so i will try pulling off the stock BOV!
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Tue, 01 November 2005 23:56
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well i took the stocko BOV off and still no BOV noise ??!???!?! 
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:04
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| Yian wrote on Mon, 31 October 2005 21:51 |
I think its time to sell your car. Its giving you too many problems dude.
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Seconded.
Have you tried the obvious logical solution as suggested and clean and lube the damn thing up? What is not having the factory one going to do to solve your problem? Nothing. If it's not plumbed to a vacuum line, it's closed, if it's closed, it's not going to do anything.
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On Probation
Location:
Hobart
Registered:
December 2004
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Location:
Brisbane
Registered:
July 2005
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:45
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| justcallmefrank wrote on Wed, 02 November 2005 11:04 |
| Yian wrote on Mon, 31 October 2005 21:51 |
I think its time to sell your car. Its giving you too many problems dude.
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Seconded.
Have you tried the obvious logical solution as suggested and clean and lube the damn thing up? What is not having the factory one going to do to solve your problem? Nothing. If it's not plumbed to a vacuum line, it's closed, if it's closed, it's not going to do anything.
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Maybe im a dumbshit, but my understanding is the "vac" line is only vac under no boost/load/closed throttle. When turbo is spooling, it is a boost line from past the throttle body which equalises pressure on both sides of the diaphragm of the BOV to stop the BOV from venting continuously. When the throttle closes, boosted air beyond the closed throttle gets sucked through engine, pressure to BOV from "vac" line actually becomes vacuum, pressure in front of TB increases as turbo boosts against a closed pipe. BOV goes whoosh.
If there is no "vac" line to the unit, how is it closed when there is boost coz there will obviously be a pressure difference?
Can someone explain otherwise to me please.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:48
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that sounds right to me, i have the vac lined connected to te BOV tho!
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:52
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| mic* wrote on Wed, 02 November 2005 08:45 |
If there is no "vac" line to the unit, how is it closed when there is boost coz there will obviously be a pressure difference?
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You are right, my comment was made on the basis that a) it's still making boost so if it's open, it can't be leaking a huge amount and b) if i'm reading the first post correctly, it was working before.
Sure, it's silly to have a non-functioning BOV there, and he has now removed it, but it's not going to be the solution to this problem for reasons stated above.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:55
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yes thats correct, Boost still comes on fine, spools to 5 psi fine, BOV worked before.
I can't find any leaks from anywhere (not saying there isn't any) Stock BOV is gone!
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Location:
Brisbane
Registered:
July 2005
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:55
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I got the idea from your first post and from TruenoGTAPEX that you only had one vac line that was (before all this) hooked up to your ssq and that you had basically poached it from the stocko, and left it without one. When ssq failed you tried switching em back?
Is this a bit off the mark?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:58
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| mic* wrote on Wed, 02 November 2005 08:55 |
I got the idea from your first post and from TruenoGTAPEX that you only had one vac line that was (before all this) hooked up to your ssq and that you had basically poached it from the stocko, and left it without one. When ssq failed you tried switching em back?
Is this a bit off the mark?
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This is how I read it.
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On Probation
Location:
Hobart
Registered:
December 2004
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Re: BOV mystery!!!
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Wed, 02 November 2005 00:59
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LOL that is how it was
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Location:
Brisbane
Registered:
July 2005
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Re: BOV mystery!!!
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Wed, 02 November 2005 01:10
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a "T" and a bit of hose...
...anyway, i made that earlier suggestion based on that interpretation.
I thought that with stocko getting "boosted" open all the time, it mite have got good and proper stuck open, and then at closed throttle it bled enough air to eliminate the "hammer" effect that is needed to open the ssq.
It would explain it only opening a lil, and the rest is lost through the open stocko, and spool speed loss.
If you got a dodgy BOV that explains a lot too, but when you get your new one...
a "T" and a bit of hose...
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