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Old 12-23-2005, 08:40 PM   #1
IllNastyImpreza
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Default atmospheric dump wastegate?

ok...I have heard of people venting thier wastegate strait off the turbo.

my question is...when exhactly DOES the wastegate open? only @ redline? or just simply when the turbo has too much air for the desired boost?...ie @ half throttle?

is there any way to control the wastegate so it only dumps @ redline or something?

have you guys heard anyone with a straight dump wastegate? how does it sound???
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Old 12-23-2005, 08:44 PM   #2
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at any pressure level above desired
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Old 12-23-2005, 09:45 PM   #3
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Exceeding designed pressure drop across the turbine blades. And you probably would want to keep it this way as opposed to only at redline to prevent damage.
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Old 12-24-2005, 01:10 AM   #4
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NastyImpreza,

I thought I could live with an atmospheric dump, but it was so loud that my mechanic heard it from at his shop while I was getting on the freeway, 1.5 miles away. Honestly, it was so loud I could feel it in my teeth when I made full boost. It took less than a couple of hours before I went to my exhaust guy and had him fab a dump which merged with the downpipe.

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Old 12-24-2005, 01:46 AM   #5
overdose
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I love the sound of it, but I've never owned it so maybe i'd grow tired of it
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Old 12-24-2005, 01:48 AM   #6
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its loud very very very very very very very loud

i WOT next to a soundwall on the freeway with the windows open
i will not be doing it again soon
scares people tho kinda fun
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Old 12-24-2005, 03:20 AM   #7
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It's very loud, but it's not open most of the time anyway for me. I love driving in midtown manhattan and scaring the crap out of people down entire blocks. The echo off the tall buildings is incredible!!
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Old 12-24-2005, 07:22 AM   #8
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yeah super loud, almost sounds like something broke when you hit the right boost level for it to open. i love it though, then again i dont daily drive my car.
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Old 12-24-2005, 02:52 PM   #9
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is it possible to stay off the throttle enough so that it doesn't dump....say durring the morning comute?....if so I could just drive around relativly slow?
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Old 12-24-2005, 03:27 PM   #10
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if your arent going WOT everywhere the gate wont be open. I have talked with people who have them and they say theirs dont open until around 12+ psi....so if your drive semi-sane around town it should be real quiet. But when you get on it be ready for hell.
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Old 12-24-2005, 03:35 PM   #11
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i love it and wouldnt have it any other way. its loud but lets say you have your boost set to like 18psi via a mbc. the gate is closed at all times until you hit that magic 18psi mark. i have mine set to 25psi and it doesnt open till i hit 25 psi. very streetable in my opinion
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Old 12-24-2005, 04:40 PM   #12
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Yea, mine opens ~19psi so unless I'm on it, even when I need a little burst of speed, it stays closed. If I don't go WOT you'd never know I had an ewg...
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Old 12-24-2005, 07:49 PM   #13
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so where are the videos/sound clips?
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Old 12-25-2005, 09:55 AM   #14
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nice thats awesome!....I think I might just have to pipe my wastegate straight into the atmosphere!
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Old 12-25-2005, 12:15 PM   #15
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Quote:
Originally Posted by Poodie
so where are the videos/sound clips?

videos dont do it justice.

you could say "yea, that DID get louder"....but a camera's mic cant capture exactly how loud an atmospheric WG dump is lol. it really will scare the hell out of you if you're not expecting it to fly by you.
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Old 12-25-2005, 01:21 PM   #16
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here's a video of my car (38mm tial ewg): driveby. since then i've had it plumbed to the downpipe. too loud!

next mod is a DTEC boost controller with 2 solenoids, so that it can be held closed until target boost is reached
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Old 12-25-2005, 04:42 PM   #17
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Quote:
Originally Posted by IllNastyImpreza
is it possible to stay off the throttle enough so that it doesn't dump....say durring the morning comute?....if so I could just drive around relativly slow?
With a TD06h-20g/38mm TiAL EWG setup (1bar spring and Harman MBC) my EWG starts to open around 1.2bar and boost peaks at 1.4bar. I'm guessing the WG starts dumping at 1.2ish since that's when the car's growl becomes a bit louder. With my automatic transmission it's quite easy to drive long distances without the WG opening.

At .9 bar the car put down 270whp (DynoJet) so there's really no need for me to push it anymore than that for daily local driving unless I really need to accelerate. I don't find the sound too annoying (girlfriend hates it), I have more issues with the car spooling and accelerating faster than anticipated.
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Old 12-25-2005, 04:59 PM   #18
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Quote:
Originally Posted by IllNastyImpreza
nice thats awesome!....I think I might just have to pipe my wastegate straight into the atmosphere!
very good choice. You will also be making more power this way Kingpin I believe it was said that people who had their dump tubes plumbed back into the downpipe made less power on average than straight dumpers.......lol, dumpers.
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Old 12-25-2005, 07:11 PM   #19
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Quote:
Originally Posted by Phil Jr.
...people who had their dump tubes plumbed back into the downpipe made less power on average than straight dumpers.......lol, dumpers.

hahaha

next question is...can I do this with the stock turbo internal WG? ie...adapt the flange with a seperate pipe and a little seperator in the turbo exhaust housing...?
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Old 12-25-2005, 08:43 PM   #20
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i have forgotten what we are talking about. I thought we were discussing aftermarket external wastegate setups.....

i honestly dont think it would be worth all that effort on a stock turbo.
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Old 12-25-2005, 10:02 PM   #21
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Quote:
have you guys heard anyone with a straight dump wastegate? how does it sound???
It will sound like your car doesn't have an exhaust. Basically just bypasses your exhaust system. Seems like you may gain a few HP this way, being that there is no restriction.
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Old 12-26-2005, 12:11 AM   #22
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I think it has more to do with the turbulance created by a regular wastegate dumping right back into the normal exhaust flow. With a full atmospheric external wastegate you totally seperate the two flows which are traveling at different speeds. At least that is my understanding of it.
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Old 12-26-2005, 02:58 PM   #23
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With stock turbo, right now the WG and turbo dumb into the same spot. You would have to weld something in there to keep the gases seperate. That way you could make a exhuast for the turbo and the WG.
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Old 12-27-2005, 01:09 PM   #24
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external wastegates greatly improve VE by virtue of the fact that they offer more opening area than do internals.
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Old 12-27-2005, 01:24 PM   #25
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what about some sort of mini-muffler for the wg dump tube?
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