Converting a 20g turbo to an external wastegate

[protecthishouse]

Hey guys. I need some help on changing my internally wastegated 20g turbo to a externally wastegated setup. I am gonna be running my wastegeate on the mani and already have the wastegate & mani picked out. I just need to know what to do with the turbo to make it ready for this setup.

Thanks!

 

[GPTourer]

I just had my flapper welded shut.

 

[CSFX8588]

That's the easiest way to do it. You need to make sure that flapper never opens. Most people just weld it.

 

[protecthishouse]

It's that easy? Sorry, new to external wastegates.

 

[GPTourer]

It was "easy" for me, because I just took a few dollars out of my pocket. I don't own a welder so I just dropped the turbo off at a machine shop and picked it up the next day.

Then you just run your vacuum lines to your external WG and it handles regulating excess exhaust pressure.

 

[protecthishouse]

I'm still in high school and we have 3 different kinds of welders. Do you think it'd be easy enough for me to weld it myself? I'm pretty good with a welder and trust myself. Also, do I need to take the compressor side off from the exhaust side, or what? Also wondering once this is all welded up, can I take the internal wg actuator off mostly for aesthetics?

Thank you again, appreciate it

 

[ZombieSix]

Once it's welded yeah remove the actuator no point in having it there. I'm more of a wastegate off the o2 fan myself though.

 

[Mike02rt]

I'm still in high school and we have 3 different kinds of welders. Do you think it'd be easy enough for me to weld it myself? I'm pretty good with a welder and trust myself. Also, do I need to take the compressor side off from the exhaust side, or what? Also wondering once this is all welded up, can I take the internal wg actuator off mostly for aesthetics?

Thank you again, appreciate it

Personally, I'd recommend just a couple tack welds on the flapper wheel.
That way it's extremely easy to grind them off if you change your mind/ setup
later on down the road. It will also make it easier to sell if you do it this way as well

 

[JusMX141]

Two tack welds between the actuator lever arm and the turbine housing....done. Do it with the actuator still in place and holding the flapper closed, then remove the actuator.

 

[protecthishouse]

So you're saying tack on the outside of the housing, not on the inside? Also, I have the o2 dump for the internal on my down pipe, do I need to do anything with that? I can provide pics if that makes it easier.

 

[Crazylilpunk]

Pics always help, but as long as your wastegate dump tube on the o2 housing is recirculated into the o2 housing/down pipe, then you shouldn't have to do anything with that.

 

[Mike1ls]

So you're saying tack on the outside of the housing, not on the inside? Also, I have the o2 dump for the internal on my down pipe, do I need to do anything with that? I can provide pics if that makes it easier.

I think he was trying to say just a couple tacks on the flaper itself.

Kind of interested in this, staying tuned in!

 

[Joethefallen23]

I think he was trying to say just a couple tacks on the flaper itself.

Kind of interested in this, staying tuned in!

No, he's saying to tack the swing arm itself on the outside of the housing. Much easier to grind away if you decide to go back to internal/sell it.

 

[protecthishouse]

So I'm kinda lost. Do I tack on the inside or outside? Pictures would be helpful too. Also, I plan on running 13-14 psi so what spring do I need for waste gate?

 

[nfernotalon]

Tack both the arm on the outside and the flapper itself on the inside. A 10 psi spring is fine. Do you have a boost controller? If youre controlling boost with just the spring then youll need a 14psi spring.

 

[rEclipserGST]

Two tack welds between the actuator lever arm and the turbine housing....done. Do it with the actuator still in place and holding the flapper closed, then remove the actuator.

This.

Here is a pic of my 20g I did recently. The 2nd pic is what I did to my 14b when I first went external. You make the decision.

 

[protecthishouse]

I've got a manual boost controller. That should work, yes?

 

[agentorange313]

I've got a manual boost controller. That should work, yes?

do you know how a manual boost controller works?
http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/237982-best-way-install-mbc.html

If you do, then my question is, why would it not work?

 

[protecthishouse]

Oh yea, I know how it works. I'm going back for another tune once I do my external with new manifold. I know it's preference, but what's better: tack on the inside of the housing or on the outside? Or even both?