External Wastegate Dump

Hey all;
Just quick question. When using an external wastegate, what's the best location to dump into the exhaust? Do you want to run the pipe and merge into the downpipe, or someplace after the cat, or just dump straight down? What would be best, and why? I've seen on tuners that some people just basically ran a straight pipe down. Weird.

Its all about sound and backpressure... If you don't mind the crazy awesome sound of running it atmosphere, then thats your best bet. If you run it back into the downpipe, make sure its far enough don't that its not gonna be making backpressure on the wastegate. If the pressure builds in the dump pipe then you'll get boost creep. For now I'm just gonna dump mine atmosphere so I have no problems with creep and so it sounds ridiculously awesome. lol

I've heard dumping wg to atmosphere makes your DSM sound like a jet at open throttle. That's awesome!

Hey all;
Just quick question. When using an external wastegate, what's the best location to dump into the exhaust? Do you want to run the pipe and merge into the downpipe, or someplace after the cat, or just dump straight down? What would be best, and why? I've seen on tuners that some people just basically ran a straight pipe down. Weird.

Ignoring the fact that you might just be curious, why do you want to know?


Wait, what's that stench? Oooo do I smell some forced induction coming into the game?!?

HAHA. I'm just asking for uh, personal enjoyment.

Now, if "Bob" dumps from the wastegate to the atmosphere, it's not going to be loud. Now, this will only be when it hits enough boost to start dumping, right? So you wouldn't be able to hear it at idle or low boost, porbably only at WOT, right?

Yeah, usually only at high rpms.

I had a friend run the pipe down and stick a motorcycle muffler on it. Worked well.

HAHA... that's awesome. What's the purpose of that?

So it wouldn't be so loud, like Shpyder said, it'll sound like a jet.....maybe not with your turbo'd 420a though ;)

So it wouldn't be so loud, like Shpyder said, it'll sound like a jet.....maybe not with your turbo'd 420a though ;)

I don't know what you're talking about.

WG atmosphere dump ftw!

So then, where the best place to be to dump it at? Just a straight down pipe from the wastegate to the ground? Or would something with a little bend work, and then cut out at the cat? Isn't it basically going to sound like a car with a open DP then if it's open right by the engine?

Isn't it basically going to sound like a car with a open DP then if it's open right by the engine?

No because the WG only opens when there is an excess of turbo pressure, so it's not open all the time....but being as you're going turbo and all I assume you already know that. :D

You can dump it wherever you want, right after the WG, you could run a tube down to the cat, or you could even run an extra tube all the way along the exhaust to the back of the car, an atmospheric dump is the same no matter where you "dump" it.

Damn you just won't give up will ya? Can't I ask for a friend?

That would be cool to have it coming out the side like in front or back of a front wheel. Then when you're going and you hit max boost and it starts flowing, it'll scare the hell out out the people next to you.

oh shit the n/t master is going turbo O_O i knew this was going to happen haha

oh shit the n/t master is going turbo O_O i knew this was going to happen haha

Oh shit its Travis!! Where you been?

And I haven't actually said I was going turbo. If I was, you'd all know about it. Would building a block be the best way to go first? Exactly. So Travis, send me that block.

i still got it lol send me some money and come pick that bitch up. i've been all over the fucking place im no longer a dsm'er baby's and blah blah blah to much shit.....dont got time to explain it all atm gota go to work ill get on aim sometime and talk to u

i still got it lol send me some money and come pick that bitch up. i've been all over the fucking place im no longer a dsm'er baby's and blah blah blah to much shit.....dont got time to explain it all atm gota go to work ill get on aim sometime and talk to u

I hear ya. I still want that block tho. Send it to me. Ill pay, you know I got you.

Damn you just won't give up will ya? Can't I ask for a friend?

Haha, nope, you can't! Just admit it Dave, you've been keeping a secret from us for awhile now and it's time to let it out!!:bigthumb:

NEVER!! haha.

Like I said, I need to build a block first. A turbo may be a possibility, even though I may have some parts laying around. I would like a block first.

NEVER!! haha.

Like I said, I need to build a block first. A turbo may be a possibility, even though I may have some parts laying around. I would like a block first.

Well if you're that set on a block I have like 4 of them...

























....all with big holes though. :frown:

I have my wastegate dumping into the atmosphere. Its doesn't sound to bad and isin't really loud until around 5000rpms. And yes it does scare people when you open it right beside them. haha

A muffler on a wastegate dump tube wouldn't be the best idea I think. Because its gonna make backpressure in the system and then your right back to boost creep...

Just dump it straight down atmosphere. It will only be crazy loud when you hit full boost. Until then, its just as quiet as if it was being dumped back into the downpipe...



I think the NT master has a different ace up his sleeve, Garrett... :wink:

just let it dump on the left side of your front bumper and scare idiot drivers!! the sound of the external wastegate is trully music to my ears

If you dump straight out the bottom, there is no backpressure, just straight exhaust flow. no cat to rob hp, no bends to rob more hp, just straight out. best if you want more hp, there are electronic valves you can buy to open the dump pipe for performance and close it so it uses the stock exhaust for quiet when you dont need the power. That's what i'm going to do. But i'm pretty sure those require some welding

I have my wastegate dumping into the atmosphere. Its doesn't sound to bad and isin't really loud until around 5000rpms. And yes it does scare people when you open it right beside them. haha

I've been thinking about converting my system to external wastegate. Whats needed to do this and what are the advantages? Would it allow me to lower my boost? I would dump it to the atmosphere. The noise wouldnt matter because I'm running open d/p with a turn down, thats it.

I thought about going with a o2 dump, but I felt it was a little exsessive on an evo316g. The 3in turbo back has enough free-flowing ability to hande any and all exhaust upto 60lb/min. Dump tubes also release ALOT of heat right under the engine and will bring your engine temps up a bit more then if you were to expell the wastegate gasses into the downpipe. And seeing that I allready have a problem with Coolant temps with my FMIC I just stock with a ported 02 housing. To each there own though..

I got a turbonetics wastegate and flanges for it. I had that welded to a short pipe and then to the manifold. Then made a short pipe so it would dump at the bottom of the motor. My wastegate is adjustable with different springs and shims so I can lower or raise boost without a boost controller. I didn't have a choice but to go external since I had boost creep like hell. And I didn't want to take a chance with it running back into the exhaust.

I got a turbonetics wastegate and flanges for it. I had that welded to a short pipe and then to the manifold. Then made a short pipe so it would dump at the bottom of the motor. My wastegate is adjustable with different springs and shims so I can lower or raise boost without a boost controller. I didn't have a choice but to go external since I had boost creep like hell. And I didn't want to take a chance with it running back into the exhaust.

How much did the w/g and flange cost and what kind of manifold do you have? I need another manifold and was really thinking about stock 2g but not sure.

We made my manifold out of a flange and some heavy gauge bends. It cost right over 200$ for the whole wastegate set up.

Open dump O2s for internally gated turbos suck. Too loud (due to the small gate) and worthless, in my experience.

Externals mounted to the O2 housing don't control boost as well (low psi) as a manifold setup dumping the collector, but can work as well as a manifold setup dumping 1 runner, and are the only decent way to route the WG back into the exhaust IMO.

Manifold setups dumping one runner are easy to come by. SBR sells manifolds that have the flange cast right into it, just need the WG and a dump pipe. They are not ideal but certainly get the job done for cheap money.

Manifold setups dumping the collector are the best out of all options, best boost control, and best sound. Loud, but nice and clean, like a loud exhaust. I've run ridiculously low boost on ridiculously large turbos with such a setup. I had two. One was an extremely rare and highly saught after FP piece from WAY back in the day. It's still rockin out on the 2g with it's new owner. Another I had on a 1g was welded up locally and started to crack. Welding steel or stainless tubing to a cast manifold and having it last more than 6 months or a year is a lot more difficult than it would at first seem. Only let someone experienced with welded tubing to cast perform this operation. The most common implementation of this style manifold is a tubular manifold, they can easily dump the WG off the collector. All respectable tubular manifolds dump the collector. This gets pricey though and is typically only worth it when you are converting to full garret and need a manifold anyway...

Small mufflers on the WG dump have been done before, and have not shown any perceptible increase in boost creep. They are small non-restrictive perforated core style mufflers.

Different setups will sound different. O2 setups and collector setups sound better since it sounds just like the exhaust. Dumping one runner sounds much more flatulent, and I personally do not like it. Either way, you won't hear anything unless you are over your set boost point, regardless of RPM.

External WGs are the balls, and you'll never want to go back to an internal, at least if you're trying to max out your turbo or run low boost on large turbos. The one exception I've found to this is the EVO 8/9 turbo. The internal gate works flawlessly. Even on the FP EVO Green/Buschur 20g-LT at 50 lbs/min it works very very well, either with the stock actuator or an upgraded 19-21 psi unit.

i dont mean to get on your bad side kevin, and nore do i doubt your knowlage, but i just want to say that i have an 02 dump housing, and my e316g holds 14psi all the way to redline, no creep at all... i love it, and would never go any other way! the sound is absolutly AMAZING! i love when it hits full boost, and the wastegate opens... the sound alone is enough to scare away just about ANY car around here... i even provoked a race with a Z06 vette owner, and he was talking about how he was going to kill me so bad in a race... well, we where getting ready to race behind the homedepo (1/4 mile road with plenty of stopping ground) and i wanted to warm my car up a little, and take a friend for a ride before the race to make sure everying was running good. so i'm cruzing around the parking lot, and i go all the way to the other end, and turn around, and just casually drive... after 1st gear shift at 2500rpm, and into second, i decided i would let it boost a little... well, a little turned into alot, and i just kicked the gas peddle to the floor... tires spinning and boom! i hit full boost, my wastegate slammed open and the true roar of my DSM rang out! i came to a stop, and said "lets race" and he told me that he "didnt want to run anything that THAT modded, because he only had cams, exhuast, intake, and a performance chip. and he appologized for talking so much shit about my car... great story!

good thing he pussed out, because boy would i be imbarased when he KICKED MY ASS with my girl their and everything...

If it holds 14 psi to redline, it's not due to the O2 dump, but to the turbine housing itself. Most likely of course, and other disclaimers, since every case is slightly different. But in my experience with 14Bs (that love to boost creep), the external dump O2 had absolutely no measureable effect on boost creep. Others had posted similar results shortly after I published mine (a good 5-6 years ago). YMMV. :)

I also hated the sound, but that's a matter of taste I suppose. I just don't want people to go that route expecting it to sound like an actual external WG. It's quite different. :)

And no one is going to get on my bad side by disagreeing with me! I hope I have always encouraged people to formulate their own opinions by testing things themselves. :)

Sweet story too, good times.

O/T:kevin, your so fu*king cool! like your so chill about everything you say, its badass! ... just FYI...