Easiest/Best/Cheapest way to go external wastegate?

[firebirdvert305]

Well ive been dealing with this problem ever since I threw the Evo 316G on...It will not hold boost for anything at any given psi, so I really have no resort, but to go external WG which i dont mind. People say If I would of ported the flapper door or go 34mm flapper it woulda solved it, but also alot of people remove there turbos, go 34mm and cant run high boost/or it will still creep. My question is to you guys which would be the easiest route to go external? Would it be buying a new 02 housing (punishment-racing.com) flanged for a tial 38mm wg? Downside to doing it this way would be that, on the turbine housing side its still very limited exhaust pressure with 31mm flapper, and would probley need to be ported out in order to work well? Would it be better/easier to flange off my Evo 3 manifold,#1 runner or collector? Lemme know which is the best way to go here, any info is helpful thanx guys.

 

[fwdeclipse]

If you put an external on the o2 housing it wont do anything because its the poorly designed turbine housing which causes it. If you run one off your number one runner would be the best route but if you just port your housing properly you wont need to use external. http://dsmtuners.com/forums/showthread.php?t=186525 I followed this link and with my e316g It did not creep on me at all with a full 3" exhaust.

 

[firebirdvert305]

Do you have 272/272 cams or an 3" o2 housing just curious?

 

[vintagemuscle]

Like stated above, if it is ported correctly it shouldn't creep. However, going external is still the best route for rock solid boost control.
The easiest and cheapest way to do this would be to weld the internal flapper shut, send your manifold to slowboy and have a 38mm wastegate flange welded on, get a tial gate and fab up a dumptube. This would cost around $300 for everything.

 

[fwdeclipse]

Do you have 272/272 cams or an 3" o2 housing just curious?

No I did not have 272 cams but I did have a evo 3 o2 housing that I hogged out as big as it would go. With the way I ported it I was able to run as low as 15psi. Before it would creep well past 24psi.

 

[TimG]

From all the times I've had bad creep issues on a EVO16G, I've resolved the issue by gasket matching the O2 housing (because it doesn't line up well) and porting the wastegate path where it dumps into the downpipe.

 

[GVR4592]

From all the times I've had bad creep issues on a EVO16G, I've resolved the issue by gasket matching the O2 housing (because it doesn't line up well) and porting the wastegate path where it dumps into the downpipe.

I believe he has a tubular O2 housing, but the problem can still be resolved with porting like I, and some other people, suggested in his last 2 threads.

 

[firebirdvert305]

GVR4592, the turbo has already been ported out, Like i said in many of my lasts posts, i NEED IT TO RUN HIGH BOOST, 34mm flapper is not an option here. So no matter how much its ported its not gonna be able to serve its purpose. So like i said, people who have done external gates on mitsu turbos...please chime in.

 

[Gary 420A RS]

just check the for sales and find you a minfold ready for external. either that or have your number one runner opened up and weld on an adapter for an external. its on you. keep it up top though. and off the o2 housing.

 

[definitiveno]

Sbr mani

 

[GVR4592]

GVR4592, the turbo has already been ported out, Like i said in many of my lasts posts, i NEED IT TO RUN HIGH BOOST, 34mm flapper is not an option here. So no matter how much its ported its not gonna be able to serve its purpose. So like i said, people who have done external gates on mitsu turbos...please chime in.

I've done external off the O2 housing using a SLS O2 housing and a Tial 38mm wastegate. I ported the shit out the wastegate passage where the flapper would normally be and it worked great.

 

[Reese92tsi]

Just go with an ssautochrome external wastegate, they seem to work just as well as the Tials and you can get them for under 100 bucks. The easiest way to install it would be to drill a hole in the no 1 runner thats no smaller than the wastegate opening than weld the flange on, then you need to tack the flapper shut, weld up a dump tube and voila rock solid boost control.

 

[daren_p]

GVR4592, the turbo has already been ported out, Like i said in many of my lasts posts, i NEED IT TO RUN HIGH BOOST, 34mm flapper is not an option here. So no matter how much its ported its not gonna be able to serve its purpose. So like i said, people who have done external gates on mitsu turbos...please chime in.

Was curious what is high boost? I have run 22psi on my evoIII daily with the 34mm flapper & it holds no problem. My turbo is also ported properly by myself & can hold 13 psi no problem with the internal gate. I do run a 3" high flow cat but I have ported others the same & they run 3" straight through system with no creep either.

External of the mani would probably be the cheepest & should fix your creep no problem. If you want to run it off the O2 housing you will need to open up the WG hole a good amount & probably take some material out above the WG entrence on the turbine inlet side (part of the porting you need to do to prevent creep with an internal)

 

[fwdeclipse]

Was curious what is high boost? I have run 22psi on my evoIII daily with the 34mm flapper & it holds no problem. My turbo is also ported properly by myself & can hold 13 psi no problem with the internal gate. I do run a 3" high flow cat but I have ported others the same & they run 3" straight through system with no creep either.

External of the mani would probably be the cheepest & should fix your creep no problem. If you want to run it off the O2 housing you will need to open up the WG hole a good amount & probably take some material out above the WG entrence on the turbine inlet side (part of the porting you need to do to prevent creep with an internal)

Just as daren said what do you call high boost, cause if you want to run higher boost who cares if it creeps if your gonna run high boost anyway.

 

[firebirdvert305]

Well 110 octane is available only at the track which is about a good hour away from me. So even tho the high boost will be limited on 93 pump gas it will be in the range of 25+ on 110 and 20-22 on pump gas. Ive contemplated on methanol injection and just run high boost all the time, but boost will be erratic even with the methanol so it will be a trade-off. Either way I have to get the boost under control, thanx for the info guys, il probley just flange off the #1 runner then weld the flapper. Il let you guys know what I end up doing.

 

[NewB2dsm]

my only sugestion when you do go external is NOT to weld the flapper shut. If you ever want to sell the tubro down the road, you have to find someone to buy it who is setup for an external gate. I left mine alone and just pulled the line to the stock wastegate.

 

[GVR4592]

my only sugestion when you do go external is NOT to weld the flapper shut. If you ever want to sell the tubro down the road, you have to find someone to buy it who is setup for an external gate. I left mine alone and just pulled the line to the stock wastegate.

If you go external on the manifold you have to weld the flapper, or find some other way to effectively seal the wastegate passage.

 

[Reese92tsi]

my only sugestion when you do go external is NOT to weld the flapper shut. If you ever want to sell the tubro down the road, you have to find someone to buy it who is setup for an external gate. I left mine alone and just pulled the line to the stock wastegate.

Pulling the line works but it doesn't guarantee that the flapper wont blow open. You're not welding the flapper shut you're just tacking it. Once you get ready to sell the turbo just grind off the small tack weld and you're good to go.

 

[NewB2dsm]

If you go external on the manifold you have to weld the flapper, or find some other way to effectively seal the wastegate passage.

mine isnt blowing open. I wouldnt see how its going to blow open if your wastegate on the manifold is functioning properly...

 

[2gAWDTalon]

I bought USED a 2G mani with a flange for a Tial 38 on the number 1 runner. Works like a champ, no problems. Holds boost like a champ also, held 10 psi solid on a 50 trim when I was breaking my motor in. The manifold has seen better days to, I had to have the flange that bolts to the head machined heavily (0.1") because it was warped. Some people say that this route wont work well, but it works awesome for my car on the daily!
IMO I dont think it matters if it is on the 1 runner compared to the collector because the manifold is pressurized, isn't it?
It is a cheap solution to running a external wastegate that works well. Here is a pic of my manifold.

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