TeamCapri
Tech, Repairs, Upgrades => Capri XR-2 89-94 => Topic started by: annie151 on April 28, 2009, 08:32:00 AM
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Hi capri group....I finally had my turbo rebuilt and now my car does not smoke like it use to...but it is making a grinding noise? I was told to change the bypass valve. Is that right...if so...I cannot find one...HELP!
Once again I turn to the greatest capri help group ever.
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Is it grinding? Or is it closer to a mooing or flapping noise? If it is then yes its your bypass valve.
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Grinding doesnt sound like the BPV, mine sounds like a high pitched moo. My gf thought there was a ghost under the hood. I wanna replace mine with an SSQV.
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It's kind of hard to describe...i would say it's a high pitch moo. Also turbo is not as powerful as it was before it was rebuilt...do you think they screwed it up?...I don't see how.
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oops...forgot to mention my turbo was just rebuilt.
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Hey Annie! You didn't forget to mention rebuild of turbo. But maybe your description of noise needs better splainin', eh Lucy. Is it mooing or a grinding. Did you check the turbo for free spin before resetting it? Cause a grinding would mean the turbo fins are hitting the housing, not good! I myself have often wondered hat all the mooing is about, so I've learned from your question. At least now I can stop looking over my shoulder wondering if I'm going to get trampled by the ensuing stampede under my hood. Also how much boost are you showing in regards to less power and check your dist timing, 12 degrees. Good Luck Gus.
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double check all the vacuum lines. the noise you hear is more then likely the air going back into the intake pipe from the BOV. mine makes the same noise and i can't wait to put on a aftermarket one myself
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bypass valve....bov.....eish...so many things to check...so little time to drive it. I am an idiot with turbos and I am trying to understand the knowledge of it by reading the other posts..but it throws me in a loop. What's the difference between the two and how do I check them?
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Hey Annie! A different name for a part that performs the same service. Gus
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where's a good place to get one and what price range am I looking at?
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Click here for an Ebay auction that is selling the item that will help you out. (http://cgi.ebay.com/ebaymotors/BYPASS-VALVE-AUDI-A4-A6-TT-S4-VW-PORSCHE-TURBO-BOSCH_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1171Q7c66Q3a2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem260397355927QQitemZ260397355927)
something like that would do nicely, I think Grant is running something very similar to this
[ April 29, 2009, 06:05 PM: Message edited by: STE_6000 ]
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Hey Rocketman,
I bought the bov per your instructions. They shipped it out pretty quick...next day. I hope to have it by middle of next week. I so hope this does the trick....thanks again...
to be continued......
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yup.. mine's just red
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I just rec'd the bov for my car....
Do I need some kind of adapter kit?
How do I install this?
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Hi All,Thanks for the great info,never new what that mooing noise was LOL i,ve put a BOV in and the cow is gone,not only that the car has more power now,Thanks Guys ;)
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Hey Clubbie! I'm glad you didn't have to send the capri out to pasture. You'll enjoy her more this way. By-the-way, get more involved in the forum, even if it's idle chatter. Gus
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LOL.....Will try to get more involved,this is a Great Site,Thanks Gus ;)
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ok yall, unless your pushing over 12 psi, you dont need a fancy BOV. the mooing is cuased by a white plastic thing,(i think its some sort of baffle)in the tube from the stock bypass valve
to where the bypass air enters the j tube that leads to the turbo... remove it and the mooing is gone and you can use the stock by pass valve
i actually run a HKS ssqv and a stocker too...at high boost (above 16psi) when you let off the gas slow and not all at once. the ssqv will not open fast enough to relieve all surge pressure. and id get the whoo whoo whoo of the surge before the ssqv went swoosh.. but by using a stocker too (where it stays open.. the reason you cant run it to atmosphere.. and why it messes up your idle if you try it.) it actuates as soon as boost starts to drop. where the ssqv needs a vaccume signal.
so if you let out part way ,or slowly the stocker opens and recircs until vacuume is read and actuates the ssqv...
p.s. my car dosent moo cuase the plastic insert is gone .....Joe
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The mooing is from the fluttering of the diaphragm inside the stock bypass valve. They dont hold up well over time, especially at higher boost levels. On my first capri I had one a stock bypass valve that held open under boost...it allowed the turbo to overspool because it let boost back into a low pressure area. I could only run 14psi until I replaced it with a new BOV.
The stocker is junk, replace it if you can spare the $50 or so. I dont necessarily think that running a stocker as a reduntant part is a great idea, I've never had a problem running just an SSQV
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rocket, our cars are tuned a little further than most capris on here.. your right, above 12-14 id say the stocker is too small to relieve boost surge. but i removed the plastic ring a long time ago and the moo stopped. wether from flow of air not causing the diaphram from fluttering or what does it. it stopped..
and at higher pressures the design of an ssqv, whereas boost holds it closed.. a vacuume signal is needed to override the boost holding the valve closed to actuate it.. whereas say a greddy type s, uses an adjustable springrate to hold the valve closed under boost. and is the reason they can also be used as a pop off valve for setting a max pressure on heavily boosted engines..
an ssqv will not pop off, or relieve any pressure until a vac signal is seen.. you can push 3 bar to it, and it will just push it closed tighter.. where 3 bar would completely open a type s using a stock spring..
so if you are say, driving a road course where you come into a corner wanting a little less power, and you lighten the pedal. yet keep the engine reving and the t.b dosent close to create a vacuume the ssqv will not actuate...
small amounts of surge can occour..
im running 17psi daily.. and mine will do it sometimes.. and i bought my ssqv from corksport. not ebay. it says HKS in yellow right on it...
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rocket, ill be at MACG this year, and ill bring you for a ride and make it surge a little to show ya what its doing...
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The stock turbos are extremely susceptible to compressor surge, they're very small. I ran a generic SSQV on a soft to medium setting and it elinated surge, they can respond to a ~2psi pressure differential making them great for small turbos. I ran the same bov on the tbird hybrid and I was able to tighten it up a bit without any surge issues.
I'd be glad to take a ride to see whats going on.
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well, see my HKS ssqv dosent have any sort of adjustment at all... except different sound inserts... its non adjustable... only the old ssqv and the knockoffs have a preload screw...
see look no adjustment screw...
(http://i258.photobucket.com/albums/hh278/RCIfabrication/PICT0742.jpg)
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im running a vj14 hot and a vj11 cold ive done some port work to the coldside making it really efficient ... and the engine is 9.4-1 compression making it spool that much faster...
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Might be worth trying one of the $60 ebay knockoffs...Ive been using one for over 2 years now and its held up fine.
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well, i got a blitz too but i dont like the way it sounds as much as my ssqv.. guess if it gives too much trouble i could put it back on...
sucks to pay 240.00 for something your not gonna use ...
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I had a type RFL for some time, I was able to get most of my money back by selling it on eBay
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yea this is a blitz rfl. its silver and the vaccume tube swivels, its a cool bov, but i like the ssqv design. its a superior BOV design.
ya know, i was thinking. ive had the ssqv on the car for well over a year. i wonder if it needs cleaned or rebuilt? do they sell rebuild kits for the ssqv BOV ?
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Not to my knowledge. I had a cheap piston style BOV, and I needed to take it apart & clean/oil it every couple weeks to keep it from gumming up.
My SSQV has been running perfect for a long time.