Waste gate n dump valve
What's the difference between a dv and an external wastegate??
I have a feeling my standard wastegate on my uk turbo2000 may not b functioning correctly as it appears to be running on actuator pressure only (0.5 bar) as opposed to 0.8-0.9 all the hoses are fine and I've cleaned the boost solenoid propperly and I can hear it clicking as it should the car is not in limp mode and I've had this confirmed. Is it possible that my bailey dump valve is at fault? |
Do u get any whooshing noises when on boost? I have a bailey on mine it's awful, not saying yours is shot but mine sticks open, you can check it's working, just run with the bonnet open rev it up and you'll see the piston in the dv working. Could be the waste gate try searching the forums to check the test procedure I'm sure someone asked a similar q recently
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Well just revved it up and yeah I can hear a sort of whooshing noise plus I can feel air blowing out of the valve whilst building the revs up and I don't mean when I let off and it dumps hahaha! I can see the piston moving so am presuming there's a seal gone somewhere
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Take the dv off, open it up take out the piston, the seal on mine had turned over and gone out of shape. Fitted a new one ( just an o ring) lubed with a sillicone spray it's ok now but I do lube once a week. Give it a go see what happens. Do u still have the standard dv?
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A dump Valve releases the pressurised air in the intercooler and pipework, when the throttle plate is closed down after any +ve boost running
An internal (or external) wastegate relieves exhaust gas away from the turbo exhaust wheel, to regulate boost levels. All OE Subaru turbos have an internal gate and an actuator, turbos without an internal gate setup also require a mechanism to regulate boost - An external gate that attaches to the exhaust manifold/uppipe. Try replacing your Bailey DV with the original item to test it ;) |
Unfortunately I don't have the original as the bailey was on wen I bought the car I'll rip it out and replace the seal first that's gotta be cheaper haha
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get a hks ssqv mate baileys suck
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They ain't cheap them hks ones are they? haha are there any other good alternatives?
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To proves its the DV, remove it, bung up hole in the boost hose (use the jubalee clip from the DV to make sure the bung is held in well) and also bung up the vac hose. take it for a run if you are now getting the require boost its the dv.
Give bailey a ring and get a new seal. jobs a goodun. Dave |
Originally Posted by Claaarkio
(Post 9179594)
To proves its the DV, remove it, bung up hole in the boost hose (use the jubalee clip from the DV to make sure the bung is held in well) and also bung up the vac hose. take it for a run if you are now getting the require boost its the dv.
Give bailey a ring and get a new seal. jobs a goodun. Dave Good principle but not sure it'll work on his model! The best way is to free off the piston for a temporary measure and source an oe recirc valve and bin the bailey all together |
Originally Posted by r1c
(Post 9179772)
What year is the car? Surely it's not on a pipe it bolts straight to the I/C?
Good principle but not sure it'll work on his model! The best way is to free off the piston for a temporary measure and source an oe recirc valve and bin the bailey all together |
Sorry shouldve said it's a w Reg uk turbo 2000 so yeah it just bolts to the intercooler can I still block it off?
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You could remove your DV, and bolt a metal plate in it's place to seal the intercooler, for testing.
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Just a bit more of a pain to do compared to the early classic where a broom handle and jubaliee clip is your friend!! :)
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So is it safe to block off the dv on the intercooler on a temporary basis
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I would say its ok to do a few runs to check the boost but subaru saw fit to add the valve so i would say it should be installed and working, although i think some people do run without one. I believe this accelerates the demise of your turbo though. Others could perhaps confirm this.
Dave :) |
Yeah that's what I thought. Wouldn't this give off loads of turbo chatter? Which sounds cool but I'm lead to believe that this causes excessive wear to the turbo. I'll try just repairing the bailey as a temp fix then I'm gonna go for a HKS ssqv I hope it is just the dv causing the problems
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your turbo would find it hard to spool going up gears , ok for first and second but will toil to build boost 3rd upwards the dump valve essentially stops backpressure causing the turbo to STALL ! and hence taking longer to spool up which is lag as its known obviously
other than that removing it would only cause lag without the dv you would get the same WHOOSH NOISE but it would be coming from the mouth of the turbo rather than the dv , that woosh noise without a dump valve which can be heard on fiesta rs turbos and escorts without dv's is basically the air travelling out backwards to the only point of pressure release ( the air filter track ) so basically it would be fine to remove it just as long as ur wiling to put up with the above until a better one is sourced :) |
Ok cool just as long as it won't make owt go boom haha. I'm guessing if the dv is buggered, blocking it off would prove this?
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Blocking it off just for testing purposes shouldn't blow the TD04 up - The MAF won't like it for prolonged periods though.
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Originally Posted by johngoulding
(Post 9182875)
your turbo would find it hard to spool going up gears , ok for first and second but will toil to build boost 3rd upwards the dump valve essentially stops backpressure causing the turbo to STALL ! and hence taking longer to spool up which is lag as its known obviously
other than that removing it would only cause lag without the dv you would get the same WHOOSH NOISE but it would be coming from the mouth of the turbo rather than the dv , that woosh noise without a dump valve which can be heard on fiesta rs turbos and escorts without dv's is basically the air travelling out backwards to the only point of pressure release ( the air filter track ) so basically it would be fine to remove it just as long as ur wiling to put up with the above until a better one is sourced :) When you "Dump" the air from the pipework the turbo has to refill the boost hosing and get the pressure back up to the point before the gear change, this will obviously cause a bit of lag, With no DV the system doesn't de-pressurise and so during quick gear changes the lag is almost eliminated completely! The flip side is the bearings on the turbo take a hit from the pressure wave which is not dissipated due to having no DV. We used to remove the DVs when running 1/4 miles at the pod to save vital 100ths ! Dave |
Cheers for all the help guys I'd be screwed without ya :-)
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How do you get that wrc type chirping sound? Is that wastegate chatter? If I fit a recirc dv with a cone filter will I still get a dump sound? Sorry for asking these 'dumb' questions but this is my first turbo car and I really don't have a clue.
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Originally Posted by syndrome1
(Post 9189485)
How do you get that wrc type chirping sound?
I'm not joking either. You want that noise, the method above is the pretty much the only way to get it. You can get a facsimile on a roadcar but it's usually pretty pale imitation in comparison, both for technical reasons and also simply because you never drive on the public road in the same way you would on a rally special stage. Is that wastegate chatter? If you delete the DV on a roadcar you'll get a semblance of the noise if you lift off on boost but as above it's very weedy in comparison to what you will have in your head. Deleting the dumpvalve on a 99-00 is not a good idea as even though the turbo will be able to deal with it for a while, the airflow sensor will quite quickly begin to suffer damage as a result of exposure to the air pulses - and if left undiagnosed will eventually cause you serious engine damage. If I fit a recirc dv with a cone filter will I still get a dump sound? TBH the most pragmatic way forward on this subject is to accept that, as above, the only way to make your car sound like a WRC is to buy one of those. Going out of your way to force your roadcar to make noises it naturally wouldn't is a bit of a fool's errand. As I've said before you could always get a CD of WRC engine and transmission noise and play them on your stereo if you like the sound so much. Your car will prefer this approach too as you won't be prejudicing the optimal operation of the engine in pursuit of spurious noise. Sorry for asking these 'dumb' questions but this is my first turbo car and I really don't have a clue. |
Sorry dude I'll be more mindful next time
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my god its nice to see you taking it easy on syndrome 1, not ! dont apologise mate this website is open to all people who know loads and those that do not.ask as many DUMB quistions as you like,if you dont ask you dont get.,
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Originally Posted by carl heath
(Post 9190519)
my god its nice to see you taking it easy on syndrome 1, not !
I used the word "dumb" for one reason - because Syndrome used it himself. I mentioned the search facility for no reason other than that it is often the quickest and best way to get answers to questions like this. It's invariably quicker than posting and waiting for someone who knows to see the thread and write out an answer. That isn't criticism, that's being helpful and constructive. dont apologise mate this website is open to all people who know loads and those that do not.ask as many DUMB quistions as you like, If the search button wasn't meant to be used, it wouldn't be there, and there wouldn't be posts like this telling users how to get the best out of it. To demonstrate the point I've just searched for "WRC Noise". These are among the first ten answers: https://www.scoobynet.com/general-te...ight=wrc+noise https://www.scoobynet.com/general-te...ight=wrc+noise https://www.scoobynet.com/general-te...ight=wrc+noise https://www.scoobynet.com/general-te...ight=wrc+noise https://www.scoobynet.com/general-te...ight=wrc+noise The thread titles say it all, and there are plenty more. There's as much already written as Syndrome could ever want to know. Finding the threads takes seconds, and yet here you are suggesting he'd be better off sitting and waiting. Nice. Oh, by the way Carl, I've had a quick scan through all those threads. I can't see a single contribution from you on any of them. :Whatever_ if you dont ask you dont get., |
Guys don't turn my post into a bitchathon lol I'm a noob end of! chill! Like I said I'll b more mindfull in future!
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Originally Posted by syndrome1
(Post 9190718)
Guys don't turn my post into a bitchathon lol I'm a noob end of! chill! Like I said I'll b more mindfull in future!
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