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Discussion Starter · #1 ·
Ok, I have seen this discussed on here many times but never saw a solution mentioned; so instead of contributing to somewhat trivial threads that seem to go in circles... I will talk about a fix here. I am NOT a master mechanic or specialist of any kind but will try to pass on the research I have done and would encourage you to verify this if you decide to try.<p><br>The R does not have a BOV per say. the R recirculates the air and if you impliment a BOV you will through a code from the air going into the atmosphere and not goinng back through the cycle.<p>An Upgrade for the R is a Diverter valve. I have not found any on the volvo aftermarket sites but <A HREF="http://www.gmpperformance.com" TARGET="_blank">http://www.gmpperformance.com</A> has several to pick from. If you go to the site - engine(in the far right column) - to Bypass/Blow-off Valves and there are a few to pick from. One of them looks just like the oem one but it metal instead of plastic... for you "sleeper" guys. The dealer will not be able to tell this one is there. Is this needed? no, prolly not... but it may help smooth out boost levels and get boost sooner. <p>Anyways, go to <A HREF="http://www.gmpperformance.com" TARGET="_blank">http://www.gmpperformance.com</A> and read through some of the "sales pitches" given for the different diverter valves and that will give you a good idea.<p>For you guys thinking of going with a bigger turbo, an upgraded/bigger Bosch one will be needed at a minimum. This one is plastic and is a comon valve for the 944 cup cars but is plastic and will not last forever. the mentioned valves may be the right fit depending on the application.
 

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Discussion Starter · #3 ·
Re: BOV solutions on an R. (gdogg16)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>gdogg16</b> »</i></TD></TR><TR><TD CLASS="quote">The R is Me7 correct? I have never seen a Me7 car through a code for having a BOV installed on it.</TD></TR></TABLE><p>mine did and a regular BOV is not going to be as efficient. How many Me7 cars do you know with 4c and all the other too smart for it's own good electronics?
 

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Re: BOV solutions on an R. (R_Rated)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>R_Rated</b> »</i></TD></TR><TR><TD CLASS="quote"><p>mine did and a regular BOV is not going to be as efficient. How many Me7 cars do you know with 4c and all the other too smart for it's own good electronics?</TD></TR></TABLE><br>not sure what a suspension has to do with the AMM, but ok.. Shouldn't really matter though. Did you car go into limp mode?
 

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Discussion Starter · #5 ·
yeah, I the car went to limp mode. We thought it was the oem boost solenoid but same thing happened again. To many variables to diagnose over the internet... much different hardware then stock.<p>Anyways, this thread was meant more to offer a solution for people wanting to try this mod. Not a bad Mod for 100-200 dollar range. I think a DP or ECU would certainly be a better mod but you are not going to be able to do either of thos for a couple hundred bucks.
 

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Re: (R_Rated)

would the diverter valve - being plastic - be a part that would wear and cause performance to deteriorate...or cause boost levels to be lower as the car ages...or is this a part that works fine and only breaks/fails and causes a code/limp mode/etc...
 

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Re: (R_Rated)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>R_Rated</b> »</i></TD></TR><TR><TD CLASS="quote">yeah, I the car went to limp mode. We thought it was the oem boost solenoid but same thing happened again. To many variables to diagnose over the internet... much different hardware then stock.<p>Anyways, this thread was meant more to offer a solution for people wanting to try this mod. Not a bad Mod for 100-200 dollar range. I think a DP or ECU would certainly be a better mod but you are not going to be able to do either of thos for a couple hundred bucks.</TD></TR></TABLE><br>Well, if that's the case, scratch the BOV and go with a DV. You can actually really hear a aftermarket DV, they sound great!<br>here is a vid of a T5R with a DV installed on it. Florians car for those who know.<br><A HREF="http://videos.streetfire.net/search/volvo+850/0/B151810C-A71F-4342-BC2B-776A1B47FF84.htm" TARGET="_blank">http://videos.streetfire.net/s...4.htm</A>
 

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Re: (23109VC)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>23109VC</b> »</i></TD></TR><TR><TD CLASS="quote">would the diverter valve - being plastic - be a part that would wear and cause performance to deteriorate...or cause boost levels to be lower as the car ages...or is this a part that works fine and only breaks/fails and causes a code/limp mode/etc... </TD></TR></TABLE><br>yes, I think Johann had trouble with his leaking so he opted for a Forge DV IIRC. The diaphrams in the DVs tend to tear over time. The R uses a Bosch DV right?
 

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Discussion Starter · #9 ·
The R's is a bosch. And like the boost solenoid, it is not a question of if but when it will go. The boost solenoid is 40 bucks from volvo and the DV can't be more than 10 bucks for oem. Niether is a diffcult fix but yes an aftermarket one will sound good.
 

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Re: (R_Rated)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>R_Rated</b> »</i></TD></TR><TR><TD CLASS="quote">The R's is a bosch. And like the boost solenoid, it is not a question of if but when it will go. The boost solenoid is 40 bucks from volvo and the DV can't be more than 10 bucks for oem. Niether is a diffcult fix but yes an aftermarket one will sound good.</TD></TR></TABLE><p>have you tried runing a hybrid valve? Like the Go Fast Bits stealth? They vent 50/50, half to the intake and other half to the atmosphere. The stealth is actually adjustable so you can vent 50/50, 40/60, 30/70 etc..
 

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Discussion Starter · #11 ·
I just want everything to recirculate. More air going to the intake seems like a better fit for where I am headed.
 

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Re: (R_Rated)

The R's CBV is in the KKK turbo. Not a Bosch product.<br>The shape of the internal valve makes it a bit hard to block like with the Mitsu torbo's.<p>I used a Forge DV on my V70R instead of the plastic VAG ones because they are known to malfunction when working with higher boost.<p>Forge is offering a whole range of DV's, some of them more suitable for MAF based systems, different valve.
 

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Re: (Mash)

Non.<p>Only needed when changing to a non KKK/Volvo turbo because these turbo's do not come with a build in CBV.
 

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Re: (Johann)

i watched the video of that 850 wagon with the diverter valve and it sounded cool. <p>i might put one of those onto my car if <p>a) it's relatively cheap<br>b) it's easy to install<p>i have already swapped out my boost control solenoid..that was easy. i don't think mine was broken as the car pretty much drives the same with the new one...with the exception that pehaps boost seemed to come on a bit smoother after i put it on ...maybe it's in my head....<p>anyway....is the CBV and a diverter valve the SAME thing or not?<p>is a diverter valve somethign that repalcest he CBV? or is it a part that you add to the turbo system?<p>if I just want to change out my CBV to a new one - is it easy to install?<p>if my CBV is worn/torn - what are the symptoms? will the car run fine up until the point of failure and then the car has no boost...or will it wear/tear and you gradually lose boost, or lose the "whoosh" sound when you let off the gas or what....<p>thanks.
 

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Re: (23109VC)

This is the KKK's CBV,<p> <IMG SRC="http://www.swededemon.com/images/Albums/KKK/KKK-Images/3.jpg" BORDER="0"> <p> <IMG SRC="http://www.swededemon.com/images/Albums/KKK/KKK-Images/2.jpg" BORDER="0"> <p> <IMG SRC="http://www.swededemon.com/images/Albums/KKK/KKK-Images/1.jpg" BORDER="0"> <p> <IMG SRC="http://www.swededemon.com/images/Albums/KKK/KKK-Images/0.jpg" BORDER="0"> <p>As you can see not that easy to block.<p>Added to that, you need to fabricate connections in the alloy or plastic turbo plumbing if you want a DV to fit.<br>It needs to be routed back to the intake pipe between turbo and MAF and this pipe is made out of plastic..
 

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does the CBV "wear" out and affect performance over time...or can it fail or partially fail and result in low boost???<p>i have no real major desire to add a DV if it's a bunch of work.<p>i just want to avoid having some $10 part fail, that is relatively easy to replace, and wind up with partial performance.....<p>as I don't have a boost gauge, I have no way to know if I'm making full boost...or not.<p>i have no idea what happens if/when a CBV breaks...but I'm wondering if it is possible for this thing to break and allow pressure to bleed from teh turbo, even when it is SUPPOSED to be closed...and result in low boost...meaning the car would be slwoer than it should be...<p>am I wrong?<p>HOW HARD is it to change thsi thing out? can I do it myself...as easily as the boost solenoid...from the pics it looks a bit hard to get to...if i go to the dealer, what would it cost to replace this thing?
 

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Re: (23109VC)

I don't think it is available as a serviceable item.<p>It is hard to reach but it is not undoable to open it up I guess.<p>Placing a spacer ring underneath the spring should be enough to make it block the passage. <p>The DV plumbing however will be a headache unless you want to replace with alloy pipe. <BR><BR>
<i>Modified by Johann at 11:42 PM 6-9-2006</i>
 

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Discussion Starter · #19 ·
Re: (Johann)

<IMG SRC="http://csramotorsports.com/forums/index.php?action=dlattach;topic=27953.0;id=5452" BORDER="0">
 

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Re: (Johann)

not sure i understand.<p>It seems like Johann is saaying the CBV is NOT serviceable. I thought I had heard others say the CBV could be replaced.....<p>is it a common failure item? how do you know if it's broken? uif it breaks, what happens?
 
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