modified my dump valve - now i can hear the wastegate
18 April 2002, 08:00 PM
#1
\m/ ^_^ \m/
Thread Starter
was having a mess around with my bailey BOV the other weekend and tried putting a jubilee clip around it & over the vents just leaving a small gap, i ended up with a quieter venting sound, but got the wastegate chatter i've been after for a while. theoretically, i'm running without a BOV except for a small amount escaping, is this going to do any damage? anyone?
kev
kev
18 April 2002, 10:08 PM
#4
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Can you send me more details on this?
I posted a question on here a couple of weeks ago but didn't really get a response
Matt
I posted a question on here a couple of weeks ago but didn't really get a response
Matt
18 April 2002, 10:15 PM
#5
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I fitted a bailey at the weekend with the hope of chattering, but dont seem to get any.
My brothers gtir chatters like a **** & thats got a bailey.
If its safe to do like you say, I may be tempted.
My brothers gtir chatters like a **** & thats got a bailey.
If its safe to do like you say, I may be tempted.
19 April 2002, 08:05 AM
#6
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I love that chattering noise its lovely. If anyone can tell me where I can get one that does that I'll go and get one tomorrow.
Have had the Whoooosh type before and they get annoying after a while.
Jay
Have had the Whoooosh type before and they get annoying after a while.
Jay
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19 April 2002, 08:56 AM
#9
\m/ ^_^ \m/
Thread Starter
i'm running 14 psi & a HKS powerflow with cold air plumbing from where the front fog light used to be, seems to be loudest first thing in the morning, probably when the engine is cold.
tried to take it apart to tension the spring, but couldn't find a way in
kev
tried to take it apart to tension the spring, but couldn't find a way in
kev
19 April 2002, 01:14 PM
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I don't think it works for re-circ BOVs.
When you buy a Forge vent to atmos I think you get a choice of which strength spring you get?
I could be wrong though, as I usually am.
Matt
When you buy a Forge vent to atmos I think you get a choice of which strength spring you get?
I could be wrong though, as I usually am.
Matt
19 April 2002, 01:35 PM
#12
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Caution chap's, the dump valve (BOV) needs to be free flowing (re-circ & vent to atmos.) otherwise it will not do it's job of protecting the turbo properly ('back' pressure when the throttle is closed). OK if you have a 'ball bearing' turbo or one with an uprated thrust bearing on the compressor side, however!
19 April 2002, 03:34 PM
#14
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I just telephoned Forge. Really helpful chap on the phone is sending me a RED spring and 5 shims in the post today!!!
Now that is what I call bl00dy good service with no charge :wow:
In principle, I don't see how wastegate chatter cannot be induced by either re-circ or the dump to atmos BOV's???
I believe that the stiffer springs are usually required when running more boost. The standard spring can be forced open before the throttle is released.
I am unsure as to why the stiffer spring and shims induce wastegate chatter but I believe that a stiffer spring and shims will dump less charged air to recirc/air, so therefore hold pressure in the aircharge system and so induce wastegate chatter.
Mine already does it a little bit when stepping off the throttle when accelerating, i.e. when some old granny pulls out in front of me!!!
I could be wrong in this theory.....???
Jacko.
p.s. I have a VF23, so let the chattering commence (within reason!)
Now that is what I call bl00dy good service with no charge :wow:
In principle, I don't see how wastegate chatter cannot be induced by either re-circ or the dump to atmos BOV's???
I believe that the stiffer springs are usually required when running more boost. The standard spring can be forced open before the throttle is released.
I am unsure as to why the stiffer spring and shims induce wastegate chatter but I believe that a stiffer spring and shims will dump less charged air to recirc/air, so therefore hold pressure in the aircharge system and so induce wastegate chatter.
Mine already does it a little bit when stepping off the throttle when accelerating, i.e. when some old granny pulls out in front of me!!!
I could be wrong in this theory.....???
Jacko.
p.s. I have a VF23, so let the chattering commence (within reason!)
19 April 2002, 06:51 PM
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Sorry for being a bit thick but what is the chatter noise? I've had two turbo cars with BOVs but they only ever whoosh. Current Blitz BOV makes my car sound like a bus!
19 April 2002, 07:34 PM
#19
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when i got my scoob it already had a hks bov on but it only made a woosh then i fitted a px induction kit and it now chatters like crazy.
sounds feckin fantastic,like a wrc car!!!
sounds feckin fantastic,like a wrc car!!!
19 April 2002, 07:55 PM
#20
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Forge will give you chatter with an induction kit and a red spring. Just changed mine to a blue to get more whoosh less chatter.
Maybe the best compromise is a blue spring and some spacers to get a half way house?
Maybe the best compromise is a blue spring and some spacers to get a half way house?
19 April 2002, 09:35 PM
#21
Chatters caused by the pressurised air blowing over/through the wastgate. Cosworths do it really well if you blank off the dump valve, so I assume Impreza'a may do the same.
You will only hear it tho' if running an induction kit or resonator less panel filter....
You will only hear it tho' if running an induction kit or resonator less panel filter....
19 April 2002, 10:00 PM
#22
\m/ ^_^ \m/
Thread Starter
all makes sense, just wish i could adjust the bailey, i was told you can adjust them by turning the rod inside while stopping the piston from turning. easier said than done
but my current mod will do me for now, kind of like having an adjustable BOV without the cost
but my current mod will do me for now, kind of like having an adjustable BOV without the cost
19 April 2002, 10:21 PM
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scott, yes the scoobs do it, as long as you have an induction kit to hear it like you say, mines loud as hell with no dump valve and pipercross induction 
chatter is not the wastegate though, its compressor surge...
chatter is not the wastegate though, its compressor surge...
19 April 2002, 10:38 PM
#28
\m/ ^_^ \m/
Thread Starter
got a previous picture, so had a quick blast in photoshop
kev
[Edited by flat4 - 4/19/2002 10:39:01 PM]
kev
[Edited by flat4 - 4/19/2002 10:39:01 PM]