Wastegate to Atmosphere questions...

8Complex · 04-11-2002, 02:23 PM

I've only been able to find one discussion of this on the board and it didn't get much into detail...

Assuming 2.5L with an external wastegate setup :

1. When venting the wastegate to atm. is it (by itself) as loud as a straight pipe out of the turbo?

2. Would it shoot flames on a regular basis, or just when tuned more rich? I'm assuming it'll just do it during shifts or when the throttle is let up and pressed again.

3. Would the backpressure of it's own routing (tubing, muffler, etc) cause backpressure to build up and more of the wastegate to be less accurate/effective?

4. Does anyone have a sound bite, or could someone take one? I think everyone would like to hear this anyway, so it might be a good time.

Lastly - if there is such a thing as a resonator, why can't I find any on Jegs, Summit Racing, etc's sites?

I know there is such a thing, but someone it eludes me.

* Registered users of the site do not see these ads.

RS2000 · 04-11-2002, 04:22 PM

Don't do it. I have my wastegate vented to the atm. and it sounds aweful. When the wastegate dumps it to the atm. it is so loud it actually drowns out my exhaust noise. I'm not sure if it varies depending on the wastegate or not but I have a Deltagate right now and am going to switch to a Tial and if i still don't like it i'm going to route it into the downpipe as far down it as i can go. As far as shooting flames, that i don't know. I am running a little rich right now and I know I can shoot a flame out my exhaust but I never got anyone to see if anything comes out of my wastegate.

subachad · 04-11-2002, 05:18 PM

Mine is currently to the atm and well, it's kinda embarrasing. The car is relatively quiet until I "get on it" then it sounds like my exhaust manifold just blew out and all of a sudden, I can't hear anything but "BWAHAAAHHHHHHH"

I feel like a "ricer" when that happens.

I plan on fixing it soon...

Chad
93 1.8T

8Complex · 04-11-2002, 05:52 PM

Do either of you guys have small mufflers on your wastegate dump? I'm wondering if that wouldn't be a good solution too. A small tube with a muffler welded to the bottom would work well and bolt right to the wastegate easily.

zaidallas · 04-11-2002, 05:56 PM

I love the atm. vented tial . However my wife thinks its loud so i'll have to reroute it now. It actually sounds very nice and scary from the outside and not ricey. It doesn't shoot flames since like you mentioned , most flames come out not under boost but shifting so its closed then . Its not loud like an open header but its loud in a more high pitch or something kinda hard to explain. I'll try to post some sound bites later.
zaidoun

Happy · 04-11-2002, 05:57 PM

They are pretty loud, but not as loud as my turbo when it's on song

I had a small custom exhaust silencer made for mine. Very cute

but it makes it much quieter. I use the Racegate, but I'm sure it can be done to other makes, certainly the Deltagate.

Happy.

RS2000 · 04-11-2002, 07:04 PM

I don't have anything on the dump pipe. This is how i look at it. Its dumped to the atm. instead because its supposed to help spool the turbo quicker because there is no restrictions. Wouldn't putting a little muffler on there cause a restriction and effect spool up anyway. Might as well just keep it routed in the exhaust.

Happy · 04-12-2002, 03:24 AM

The wastegate should be "shut" while the turbo is spooling up. That way ALL of the exhaust gas is forced through the turbo exhaust turbine, and giving quick spool up.

Part of the problem you guys have, is that because you only apply pressure to "OPEN" the WG, and or, use a very soft spring to limit boost, you're probably suffering from WG creep.

Re a silencer on the WG, so long as it doesn't cause overboost, it will be fine.

Mine was originally made with perforated exhaust baffle across it. On the dyno we found that this was fine at low boost, but once we tried to run over a certain level, it was so restrictive, that boost wouldn't drop below about 20psi, even with the WG fully open............. I run a 10psi spring.

Happy.

Wreckleford · 04-12-2002, 10:57 AM

I tested out a small silencer in my wastegate dump tube. It was sort of like those silencers that Apexi put in their muffler tips. It had fiberglass insulation in it to kill the sound, but the insulation didn't last too long due to the heat. I was thinking of using steel wool but that might rust out in no time. I was considering using some aluminum swarf from a machine shop or stainless steel if possible. I took it back out, but I still plan on making a better one in the future as it was effective in lowering the noise. It was still loud but the BLAAT sound was diminished, making it sound more like a whoosh sound.

04-11-2002, 02:23 PM	#1
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Wastegate to Atmosphere questions... I've only been able to find one discussion of this on the board and it didn't get much into detail... Assuming 2.5L with an external wastegate setup : 1. When venting the wastegate to atm. is it (by itself) as loud as a straight pipe out of the turbo? 2. Would it shoot flames on a regular basis, or just when tuned more rich? I'm assuming it'll just do it during shifts or when the throttle is let up and pressed again. 3. Would the backpressure of it's own routing (tubing, muffler, etc) cause backpressure to build up and more of the wastegate to be less accurate/effective? 4. Does anyone have a sound bite, or could someone take one? I think everyone would like to hear this anyway, so it might be a good time. Lastly - if there is such a thing as a resonator, why can't I find any on Jegs, Summit Racing, etc's sites? I know there is such a thing, but someone it eludes me. * Registered users of the site do not see these ads.

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04-11-2002, 04:22 PM	#2
RS2000 Scooby Newbie Member#: 2138 Join Date: Aug 2000 Location: NJ Vehicle: 2000 2.5 RS-T BRP	Don't do it. I have my wastegate vented to the atm. and it sounds aweful. When the wastegate dumps it to the atm. it is so loud it actually drowns out my exhaust noise. I'm not sure if it varies depending on the wastegate or not but I have a Deltagate right now and am going to switch to a Tial and if i still don't like it i'm going to route it into the downpipe as far down it as i can go. As far as shooting flames, that i don't know. I am running a little rich right now and I know I can shoot a flame out my exhaust but I never got anyone to see if anything comes out of my wastegate.

04-11-2002, 05:18 PM	#3
subachad Scooby Specialist Member#: 8488 Join Date: Jul 2001 Location: Sin City Vehicle: 1993 Impreza GCStyle Teal	Mine is currently to the atm and well, it's kinda embarrasing. The car is relatively quiet until I "get on it" then it sounds like my exhaust manifold just blew out and all of a sudden, I can't hear anything but "BWAHAAAHHHHHHH" I feel like a "ricer" when that happens. I plan on fixing it soon... Chad 93 1.8T

04-11-2002, 05:52 PM	#4
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Do either of you guys have small mufflers on your wastegate dump? I'm wondering if that wouldn't be a good solution too. A small tube with a muffler welded to the bottom would work well and bolt right to the wastegate easily.

04-11-2002, 05:56 PM	#5
zaidallas Scooby Specialist Member#: 4106 Join Date: Feb 2001 Location: Expected whp/torque at 25 psi : 450	I love the atm. vented tial . However my wife thinks its loud so i'll have to reroute it now. It actually sounds very nice and scary from the outside and not ricey. It doesn't shoot flames since like you mentioned , most flames come out not under boost but shifting so its closed then . Its not loud like an open header but its loud in a more high pitch or something kinda hard to explain. I'll try to post some sound bites later. zaidoun

04-11-2002, 05:57 PM	#6
Happy Scooby Newbie Member#: 12115 Join Date: Nov 2001	They are pretty loud, but not as loud as my turbo when it's on song I had a small custom exhaust silencer made for mine. Very cute but it makes it much quieter. I use the Racegate, but I'm sure it can be done to other makes, certainly the Deltagate. Happy.

04-11-2002, 07:04 PM	#7
RS2000 Scooby Newbie Member#: 2138 Join Date: Aug 2000 Location: NJ Vehicle: 2000 2.5 RS-T BRP	I don't have anything on the dump pipe. This is how i look at it. Its dumped to the atm. instead because its supposed to help spool the turbo quicker because there is no restrictions. Wouldn't putting a little muffler on there cause a restriction and effect spool up anyway. Might as well just keep it routed in the exhaust.

04-12-2002, 03:24 AM	#8
Happy Scooby Newbie Member#: 12115 Join Date: Nov 2001	The wastegate should be "shut" while the turbo is spooling up. That way ALL of the exhaust gas is forced through the turbo exhaust turbine, and giving quick spool up. Part of the problem you guys have, is that because you only apply pressure to "OPEN" the WG, and or, use a very soft spring to limit boost, you're probably suffering from WG creep. Re a silencer on the WG, so long as it doesn't cause overboost, it will be fine. Mine was originally made with perforated exhaust baffle across it. On the dyno we found that this was fine at low boost, but once we tried to run over a certain level, it was so restrictive, that boost wouldn't drop below about 20psi, even with the WG fully open............. I run a 10psi spring. Happy.

04-12-2002, 10:57 AM	#9
Wreckleford Scooby Newbie Member#: 887 Join Date: Feb 2000	I tested out a small silencer in my wastegate dump tube. It was sort of like those silencers that Apexi put in their muffler tips. It had fiberglass insulation in it to kill the sound, but the insulation didn't last too long due to the heat. I was thinking of using steel wool but that might rust out in no time. I was considering using some aluminum swarf from a machine shop or stainless steel if possible. I took it back out, but I still plan on making a better one in the future as it was effective in lowering the noise. It was still loud but the BLAAT sound was diminished, making it sound more like a whoosh sound.