External wastegate

Splinter · Post by **Splinter** » Wed May 31, 2006 8:19 am

Ive read a ton of articles on them, and searched the forums a bunch, and I still dont get where they're installed.

I know a few people on the board have them, care to post some pics and tell me a little about your setup?

Innovative Tuning · Post by **Innovative Tuning** » Wed May 31, 2006 3:53 pm

Splinter wrote:Ive read a ton of articles on them, and searched the forums a bunch, and I still dont get where they're installed.

I know a few people on the board have them, care to post some pics and tell me a little about your setup?

On a subaru they generally come off the uppipe. Here is an example made by ultimate racing. The uppipe is black and the dump tube is raw stainless. Exhaust gas goes into the wastegate from the uppipe and out the dump tube once pressure to the wastegate actuator has overcome the spring pressure. The dump tube follows the path of the downpipe. Some external setups route the dump tube back into the downpipe to keep it quiet.

That setup is made for a wrx/sti. It is not necessary for 99.9% of legacy turbo setups and probably 95% of the wrx's and sti's out there. Some instances where it's worth it would be:
You're running a turbo that doesn't have an internal wastegate.
To remedy boost creep that can't be otherwise controlled.
To hold higher boost levels than are possible on your internal wastegate.

-Mike

sammydafish · Post by **sammydafish** » Thu Jun 01, 2006 3:22 am

or you could do like me.... out of junk parts

BAC5.2 · Post by **BAC5.2** » Thu Jun 01, 2006 10:45 pm

Pretty much what Mike said. External gates aren't necessary for a lot of people.

I'll be using a custom TurboXS external gate pipe when I go bigger.

When you go rotated mount, an external gate tends to make things easier.

A friend of mine has a 20G on his 1st Gen Eclipse and has a 38mm Tial gate welded into the turbine housing. Pretty cool.

brando · Post by **brando** » Fri Jun 02, 2006 6:24 am

I have an external wastegate on my turbo legacy. I'm kind of retared on how to post pictures though.

sammydafish · Post by **sammydafish** » Fri Jun 02, 2006 12:21 pm

brando wrote:I have an external wastegate on my turbo legacy. I'm kind of retared on how to post pictures though.

you gotta host them somewhere, then just link to them or use the [img] tag.

or just email them to me and I'll post em up

mrsupraboost@trdsupra.com

Project_Legacy · Post by **Project_Legacy** » Fri Jun 02, 2006 5:10 pm

so this external wastegate is before the turbo? the vacuum lines are still hooked up the same way, so when the turbo reaches the boost it is supposed to, the wastegate opens and lets that exhaust flow out the dumptube?

does all the exhaust flow out the dump tube??

BAC5.2 · Post by **BAC5.2** » Tue Jun 06, 2006 6:00 pm

Not all of the exhaust, just enough to maintain the turbo's output.

Project_Legacy · Post by **Project_Legacy** » Tue Jun 06, 2006 6:38 pm

ooo ic... and that depends on what size external wastegate you use correct? ok i understand that now.

555BCTurbo · Post by **555BCTurbo** » Tue Jun 06, 2006 7:34 pm

I might have to go the external gate route when I get the Holset conversion done on my SS...although I figure that the Holset wastegate will work for 25 or so psi...

Yukonart · Post by **Yukonart** » Tue Jun 06, 2006 10:35 pm

555BCTurbo wrote:I might have to go the external gate route when I get the Holset conversion done on my SS...although I figure that the Holset wastegate will work for 25 or so psi...

I was going to say, that Holset setup should already be able to handle the power levels you're looking for, Nick.

not8player · Post by **not8player** » Wed Jun 07, 2006 1:35 am

Does anyone know the stock EJ22T turbos wastegate diameter?

brando · Post by **brando** » Wed Jun 07, 2006 3:16 am

Here is my project car.

brando · Post by **brando** » Wed Jun 07, 2006 5:18 am

Thats Kelly magic work on the pipes

free5ty1e · Post by **free5ty1e** » Wed Jun 07, 2006 5:25 pm

Damn that's a pretty setup.

Edit: Let's see the intercooler!

brando · Post by **brando** » Wed Jun 07, 2006 6:05 pm

here you go.

[/img]

free5ty1e · Post by **free5ty1e** » Wed Jun 07, 2006 6:36 pm

Very nice install.... Starion IC?

555BCTurbo · Post by **555BCTurbo** » Wed Jun 07, 2006 8:11 pm

Holy Gold Engine parts batman!

brando · Post by **brando** » Wed Jun 07, 2006 8:37 pm

free5ty1e wrote:Very nice install.... Starion IC?

no it a badass bar/and plate ic I got it from my friends at corksports.

IronMonkeyL255 · Post by **IronMonkeyL255** » Wed Jun 07, 2006 9:27 pm

Nice setup Brando.

Is it finished yet?

brando · Post by **brando** » Thu Jun 08, 2006 1:19 am

soon. hopefully.

tris91ricer · Post by **tris91ricer** » Thu Jun 08, 2006 9:12 am

Omg, as if it wasn't fast enough the last time I saw it! That's fn sweet, I love the gold manifold! (I know now why you did it, its fun to say, gold manifold. *giggle* I love it! )

R1Linc · Post by **R1Linc** » Thu Jun 08, 2006 11:40 am

Yes it goes before the turbo, on my talon i cut a hole in my manifold and welded a flange over it to bolt up a Tial 38mm WG.
I had a external dump set up, it sounded awesome.

I think the rumble of a box motor accompanied by waste gate dump at WOT would sound insane.

206er · Post by **206er** » Thu Jun 08, 2006 1:37 pm

Yukonart wrote:
555BCTurbo wrote:I might have to go the external gate route when I get the Holset conversion done on my SS...although I figure that the Holset wastegate will work for 25 or so psi...
I was going to say, that Holset setup should already be able to handle the power levels you're looking for, Nick.

heaven help you if it isnt enough

now keep in mind that holset wastegates are intended for diesels, which dont have the exhaust energy of gas engines. also, the HX35 has a convoluted wastegate setup where the wastegate port is only in one runner of the turbine, which causes boost creep.
so, external may be the way to go.
nick, what holset did you have in mind? HY35 or HX35? an HX35 with a properly designed twin scroll split header would be sweet.
gotta love the fact that holsets make full boost below 4000 in higher gears too...

I'm thinking of going with a holset but I dont know if it is such a good idea with the bottom end I will run, 350BHP is my goal.
sammy, is that an audi 5000t wastegate? those are a very good unit. 600hp capable, durable, cheap. but I'm sure you knew that.
what did you do for flanges?

sammydafish · Post by **sammydafish** » Thu Jun 08, 2006 6:32 pm

206er wrote:sammy, is that an audi 5000t wastegate? those are a very good unit. 600hp capable, durable, cheap. but I'm sure you knew that.
what did you do for flanges?

yup, off an old 5KTQ, I cut some flanges from some mild steel plate stock with my torch. I think is like a 34mm unit. One off a 20v is bigger but this should be plenty for my needs. Spring is a little soft but that's easily fixed though.

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