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Im currently running a PT6766 turbo paired with a 50mm turbosmart external wastegate (screamer piped) on a street ported 13b.
So, it is loud yes, but it’s not LOUD !
My screamer is a 2" straight pipe toward the road.
For my (and maybe yours) personnal knowledge, does external gates size actually play a role in the sound of the screamer, bigger means louder/quieter ?
I think of the practical gate size range it will make no perceivable difference. Can you fit a resonator in there somewhere?
I actually want my screamer to be louder, I have a pretty quiet exhaust. At least, I need something loud when i wot
So the same amount of psi going trough a 38mm gate or a 60mm one will not change the sound at all ?
Where you point the screamer and maybe a bell or cone end will probably make a bigger difference. I can't imagine trying to make one louder on RHD car, I'm thinking of a resonator for when I redo the dump/gate pipework for mine. I guess it's a bit different if you aren't sitting on top of it.
In my experience the exhaust manifold- specifically, how much priority the WG has (ease of exhaust flow path) greatly changes the sound of open dump.
If the engine literally has to push the exhaust backward against turbine flow out the WG the dump has a hollow "Bzhuuuu" sound.
If the WG flow is inline with turbine flow and the engine doesnt have to push it out of the WG so hard the note is a sharper "BRAAA".
How much boost you are running/exhaust manifold pressure can change the sound on the same manifild/WG set-up.
My single 60mm WG had a deeper tone (without sounding hollow) than my dual 44mm WGs.
So if I understand correctly, the goal is to have the top of the wastegate up and not down? That way all the exhaust flow goes through the wastegate with the less «tube bend» ? Like the first setup in the picture (even if it still has a 90 degres bent)
Where you point the screamer and maybe a bell or cone end will probably make a bigger difference. I can't imagine trying to make one louder on RHD car, I'm thinking of a resonator for when I redo the dump/gate pipework for mine. I guess it's a bit different if you aren't sitting on top of it.
i have thinked about that, but I don’t think that would actually do something given that the tube is very short.
So if I understand correctly, the goal is to have the top of the wastegate up and not down? That way all the exhaust flow goes through the wastegate with the less «tube bend» ? Like the first setup in the picture (even if it still has a 90 degres bent)
thanks
Bobby
I'd suggest designing a manifold with efficiency in mind, not wastegate noise. Of the two mounting points you pictured, the left one is "meh" and the right one is probably the most inefficient angle possible. I think that if you were to reverse the angle of that right picture it would be more inline with the "BRAAA" example blue gave.
Ideally you want equal priority to both the turbine flow and WG so you can control your boost well. Here's mine as an example:
The wg pipe is a bit long here to increase stand-off distance from heat sources, ideally helping keep the wg's themselves cooler.
Edit: here is the mounting guide directly from Turbosmart.
I'd suggest designing a manifold with efficiency in mind, not wastegate noise. Of the two mounting points you pictured, the left one is "meh" and the right one is probably the most inefficient angle possible. I think that if you were to reverse the angle of that right picture it would be more inline with the "BRAAA" example blue gave.
Ideally you want equal priority to both the turbine flow and WG so you can control your boost well. Here's mine as an example:
The wg pipe is a bit long here to increase stand-off distance from heat sources, ideally helping keep the wg's themselves cooler.
Edit: here is the mounting guide directly from Turbosmart.
alright I’ll keep that in mind. At the moment my EW have a 90 degres angle, if I don’t change my manifold for the moment and just swap a for bigger/tinier wastegate with the same mani that doesn’t gonna change a thing in sound ?
alright I’ll keep that in mind. At the moment my EW have a 90 degres angle, if I don’t change my manifold for the moment and just swap a for bigger/tinier wastegate with the same mani that doesn’t gonna change a thing in sound ?
Sizing your WG really depends on how much boost and power you're running. At its core, the WG is just a diverter valve to manage how much exhaust your turbo sees, therefore helping to control boost levels.
I wouldn't recommend flippantly swapping WG sizes based on hoping to make different noises...
If you really want to change the pitch and perceived volume from the cabin than I'd listen to what slides said. You're more likely to adjust the pitch by tweaking piping length and diameter. If you want to change the perception of noise volume then I'd point the open end of the screamer pipe towards the ground so it will rebound towards the driver. Keep in mind that the gas coming out of that pipe is HOT and it'll cook anything too close..
Sizing your WG really depends on how much boost and power you're running. At its core, the WG is just a diverter valve to manage how much exhaust your turbo sees, therefore helping to control boost levels.
I wouldn't recommend flippantly swapping WG sizes based on hoping to make different noises...
If you really want to change the pitch and perceived volume from the cabin than I'd listen to what slides said. You're more likely to adjust the pitch by tweaking piping length and diameter. If you want to change the perception of noise volume then I'd point the open end of the screamer pipe towards the ground so it will rebound towards the driver. Keep in mind that the gas coming out of that pipe is HOT and it'll cook anything too close..
Of course I will not change my current EW for a new one for just a little sound difference, the purpose of this topic was to know if on the same setup, the size of the wastegate could influence the sound of the screamer pipe just for information
well I suppose if people make their rotary car brap just for sound purposes then this thread is not any more of a surprise than the idea that somebody has done extensive testing on a screamer pipe for the purpose of making it louder.
Did you consider a big flashing “HEY LOOK AT ME” neon sign on the roof that lights up when the wastegate is commanded to open?
well I suppose if people make their rotary car brap just for sound purposes then this thread is not any more of a surprise than the idea that somebody has done extensive testing on a screamer pipe for the purpose of making it louder.
Did you consider a big flashing “HEY LOOK AT ME” neon sign on the roof that lights up when the wastegate is commanded to open?
The point is that you're asking stupid questions which make it obvious that you don't grasp the basic concepts of turbocharged cars. Your posts indicate that you value and prioritize superficial displays over performance.
TeamRX8 can be abrasive, but he tends to have a grasp of the how and why. Your projection of him needing to understand a subject before posting just makes you look like the hypocritical clown.
abrasive as I might be, I might not choose those particular words, or obvious emoticons, etc. and I can stand well enough on my own.
I will apologize for you being offended by my words, but not for the words themselves or the intent of them. I’m open enough to express what’s on my heart, and not always just my heart alone. Often I’m not the only seeing it that way. In your defense, it’s likely the same for yourself towards me.
But maybe we can all learn something here. If it’s not about being loud for the sake of being loud, then what is it? Because I didn’t suggest that it be loud (or center of attention) all the time, just when the boost comes on hard and the wastegate opens.
Then for some reason you want to be extremely loud, or so it seems. Why does it need to be even louder then, if not to demonstrate or put yourself forward in some very obvious way? It’s clearly not for being faster, because loud and fast are not bound together.
So what constructive purpose does it serve to intentionally be louder than loud when you already have an open wastegate?
ps: guess you should know that mine has a screamer pipe dumping open underneath. I can tolerate it for now as the car isn’t driven on the street much and it’s configured such that the WG doesn’t open until 5000+ for 25+ psi boost.
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The point is that you're asking stupid questions which make it obvious that you don't grasp the basic concepts of turbocharged cars. Your posts indicate that you value and prioritize superficial displays over performance.
TeamRX8 can be abrasive, but he tends to have a grasp of the how and why. Your projection of him needing to understand a subject before posting just makes you look like the hypocritical clown.
the problem with an open wastegate, which I have had in the past, is that it greatly restricts your use of the car. It may not seem like it at first, because of the novelty of it and the kind of driving you do initially on that kind of build. Later on you realize that a lot of passengers don't want to ride in it because it's so loud. Then you realize you have to be really careful about attracting attention from cops, or angering other people around you on the road or in neighborhoods. There's also the concern that you can literally damage your hearing from the noise if you're not careful.
So the novelty wears off, and you start realizing the downsides. You get tired of all the above concerns and try to avoid them, and eventually you realize you're not driving the car as much as you want to. So you come to your senses and merge it into the downpipe. Or you realize you're sick of the car and you sell it.
Pretty much, if all that isn’t bad enough mines a full BP too, but a 2k idle gets rid of the annoying loping. All that’s going to be changed soon enough just for all those reasons.
I suppose there wasn’t anything new to learn here after all; pretty much as initially perceived.
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abrasive as I might be, I might not choose those particular words, or obvious emoticons, etc. and I can stand well enough on my own.
I will apologize for you being offended by my words, but not for the words themselves or the intent of them. I’m open enough to express what’s on my heart, and not always just my heart alone. Often I’m not the only seeing it that way. In your defense, it’s likely the same for yourself towards me.
But maybe we can all learn something here. If it’s not about being loud for the sake of being loud, then what is it? Because I didn’t suggest that it be loud (or center of attention) all the time, just when the boost comes on hard and the wastegate opens.
Then for some reason you want to be extremely loud, or so it seems. Why does it need to be even louder then, if not to demonstrate or put yourself forward in some very obvious way? It’s clearly not for being faster, because loud and fast are not bound together.
So what constructive purpose does it serve to intentionally be louder than loud when you already have an open wastegate?
ps: guess you should know that mine has a screamer pipe dumping open underneath. I can tolerate it for now as the car isn’t driven on the street much and it’s configured such that the WG doesn’t open until 5000+ for 25+ psi boost.
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I can admit that you don't understand why I would like to have a louder screamer pipe than I have now.
But on the other hand, why judge and give a negative opinion, when that's what I'm looking for??
I don't necessarily like bridgeport setups, but at NO time will I criticize those who have one because it's their choice.
As I said before, I have a very quiet exhaust to avoid disturbing my neighbors.
So to counter this lack, I would like to have a louder screamer. so no, I'm not looking for more attention as you said so well above, I'm just a good respectful neighbor who just wants to enjoy his car and have a louder WG, is that bad?
01-27-22, 05:45 PM
