How do opened wastegates sound off boost?
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How do opened wastegates sound off boost? Can't think of a better title.
I'm just trying to get my cake and eat it here. I don't want to pay for a pair of twins but I know I'll miss the sound of side pipes when I'm cruising about. So I'm thinking of doing a single and having twin wastegates going into open pipes heading down either side of the car. Then I'd use co2 to run the gates so I could open them at cruise speed.
Now the question becomes what would I hear? If I muffle the main turbo pipe these should completely overpower it right? I'd think so but as it's such a comparatively small set of exits I wonder if they'll have a lot of volume before the whoosh of the turbo starts coming through them.
I'm just trying to get my cake and eat it here. I don't want to pay for a pair of twins but I know I'll miss the sound of side pipes when I'm cruising about. So I'm thinking of doing a single and having twin wastegates going into open pipes heading down either side of the car. Then I'd use co2 to run the gates so I could open them at cruise speed.
Now the question becomes what would I hear? If I muffle the main turbo pipe these should completely overpower it right? I'd think so but as it's such a comparatively small set of exits I wonder if they'll have a lot of volume before the whoosh of the turbo starts coming through them.
Well you get to hear turbo spool, then once above your set boost level your WG will open, when you let off your WG will close and BOV will open. You wont hear full spool of the turbo but its still there.
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Yeah, but I'm going to make the wastegates open all the time, so I can emulate the back and forth of the original sidepipes when I'm cruising. Then I'll close the wastegates when I want boost, or on such occasions when a quiet car is a good thing.
I just know I'll miss that left/right rumble from the sidepipes if all cylinders are dumping into one pipe. Even having the single pipe split to either side I don't think would give the same sound.
I just know I'll miss that left/right rumble from the sidepipes if all cylinders are dumping into one pipe. Even having the single pipe split to either side I don't think would give the same sound.
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That would only make it louder though. What I'm looking for isn't so much noise as it is the particular effect that comes from having the two separate banks exhausting on either side of the car. There's that particular back and forth staccato that I'd like to maintain. I can't see why I would have any trouble with the wastegates, It's not like they'll be exposed to more temp than usual.
I wouldnt think that some 38-44mm wastegates are going to sound the way you want them to. I would think you would shorten the life of the gate by using them in that fashion also.
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dude thats just nonsense... really...
to compound this, if both banks where exiting from the crossover pipe THROUGH the wastegate, its gonna sound the same as a cutout... just worse.. unless your wastegate opening is 3" DIA. in that case, you have a diesel from a dump truck in your camaro.
MY POINT: its gonna sound like a silly HORRIBLE exhaust leak if you run the w/g open on out of boost.
to compound this, if both banks where exiting from the crossover pipe THROUGH the wastegate, its gonna sound the same as a cutout... just worse.. unless your wastegate opening is 3" DIA. in that case, you have a diesel from a dump truck in your camaro.
MY POINT: its gonna sound like a silly HORRIBLE exhaust leak if you run the w/g open on out of boost.
A wastegate was invented to regulate pressure in the exhaust system entering a turbo. Not to regulate your cool factor.
How exactly is it that you intend to have the wastegate open all the time? No spring? If so, you will need CO2 and a boost controller in order to get it to close. It will sound like an exhaust leak at the collector of an NA car.
If you want something that sounds "cool" at idle with some whistling sounds and some pulsing, perhaps you should get a blower and get it surging real good during idle. Improper fueling and/or timing will get you there.
If you want something that sounds "cool" at idle with some whistling sounds and some pulsing, perhaps you should get a blower and get it surging real good during idle. Improper fueling and/or timing will get you there.
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And I wonder at it sounding like an exhaust leak, It isn't just one cylinder dumping after all.The current exhaust isn't any larger than 60mm, so with a side pipe running off that and the turbocharger running through mufflers, I can't see where it would come off sounding like an exhaust leak. I'm not sure of that however, which is why I'm here.
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reposting this because the board keeps cutting half of it:
Further explaining, since I'm thinking a bigger turbo, I was going to use a divided housing. Then each bank would feed each side of the division. Which is why, as I said, there'd be two wastegates. One for either bank, with each wastegate feeding a seperate side pipe.
Both of you have mentioned this. And this is also exactly what I was wondering, though I could use a couple 60mm which would be near same dia. as the current exhaust.
Now as for why I'd do it just for a sound, why do people ride harleys when streetbikes are faster?
Obviously, there's more to it than just the sound, but it plays a part.
Another good example are Ferraris, which often have a lot of R&D put in to getting that certain sound.
This car has always had a certain sound ,though clearly not a ferrari sound, and it's a big part of my enjoyment with it. It's one of the first things I miss when I put it away for the winter. Though my winter car is fun, four cylinders just never has the same... presence.
Wastegates are only devices, they do or don't do whatever we want them to. I can see no reason why they wouldn't perform this task, whether specifically designed for it or not.
As for "cool" factor, I like to keep things low key, standing out is not my style.
In fact, I think the best part of this when it's all finished is that I won't have to listen to it driving around downtown. But once I've got a weekend to just eat up highway, I'd love to keep the feel it has now. With the windows down and the thump of the engine rolling the miles by, it's an awesome experience.
dude thats just nonsense... really...
to compound this, if both banks where exiting from the crossover pipe THROUGH the wastegate, its gonna sound the same as a cutout... just worse.. unless your wastegate opening is 3" DIA. in that case, you have a diesel from a dump truck in your camaro.
MY POINT: its gonna sound like a silly HORRIBLE exhaust leak if you run the w/g open on out of boost.
to compound this, if both banks where exiting from the crossover pipe THROUGH the wastegate, its gonna sound the same as a cutout... just worse.. unless your wastegate opening is 3" DIA. in that case, you have a diesel from a dump truck in your camaro.
MY POINT: its gonna sound like a silly HORRIBLE exhaust leak if you run the w/g open on out of boost.
Originally Posted by Snyper
It would sound like a bad exhaust leak. it wouldnt give you the sound open dumps would.
Now as for why I'd do it just for a sound, why do people ride harleys when streetbikes are faster?
Obviously, there's more to it than just the sound, but it plays a part.
Another good example are Ferraris, which often have a lot of R&D put in to getting that certain sound.
This car has always had a certain sound ,though clearly not a ferrari sound, and it's a big part of my enjoyment with it. It's one of the first things I miss when I put it away for the winter. Though my winter car is fun, four cylinders just never has the same... presence.
Wastegates are only devices, they do or don't do whatever we want them to. I can see no reason why they wouldn't perform this task, whether specifically designed for it or not.
As for "cool" factor, I like to keep things low key, standing out is not my style.
In fact, I think the best part of this when it's all finished is that I won't have to listen to it driving around downtown. But once I've got a weekend to just eat up highway, I'd love to keep the feel it has now. With the windows down and the thump of the engine rolling the miles by, it's an awesome experience.
People ride Harleys instead of streetbikes because they are much more comfortable and easier on their back and knees. Not because of sound, in general. :-)
This sounds like a job for an electric cut out, itll be cheaper and easier to do and will gave you the same shitty sound youre after. It will sound like an exhaust leak.
This sounds like a job for an electric cut out, itll be cheaper and easier to do and will gave you the same shitty sound youre after. It will sound like an exhaust leak.
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what about the guys riding bobbers? I doubt they ride them because they're easy on backs. back to the point.
I'm still not sure why it'll come out like an exhaust leak. Simply because there is enough size potential here to flow as much as stock, which would be far less an impediment than flowing through the turbo and then through mufflers.
I'm still not sure why it'll come out like an exhaust leak. Simply because there is enough size potential here to flow as much as stock, which would be far less an impediment than flowing through the turbo and then through mufflers.