i used the search but didnt find alot on it. Im wanting to convert to external wastegate and im wanting to know would it matter where i put the flange for the wastegate as long as its on the manifold right? I did my old srt the same way on stock turbo and put the flange for the gate on top of the manifold. and did atomsphere dump. I also welded the gate shut on the other car same way on here right? Pics would be awesome thanks guys

 

We installed an external wastegate on a stock 03' evo turbo, some years ago. I didn't want to install it on the manifold, since it would only vent from one side of our "twin-scroll" turbo. This would work, but we preferred to vent from both. To avoid this, we removed the oem wastegate flapper and made a turbo outlet flange that divorced wastegate flow from turbine flow. This way we could weld a pipe to our external wastegate and then dump to the atmosphere.

This setup was on a JUN 2.2 liter car, for time attack. The end result was way faster boost response and reduced lag. It still dropped boost up top, since the turbo couldn't keep up with the motor. The only trouble we had was with the wastegate bolts loosening and exhaust melting stuff. We fixed that with some safety wire.

Hope this helps... just my 0.02 cents.
Good luck!

Julian

 

http://www.maperformance.com/map-com...-cg40-o2h.html

http://www.maperformance.com/map-sta...s-mvs-evo.html

I say go for the MAP o2 eliminator downpipe. You can get the option for a cat delete that way all you'd need is a catback.So instead of having 4 components (o2 housing, downpipe, cat, cat-back exhaust), you'll only have to worry about 2 (o2 eliminator downpipe and cat-back)

 

I am trying to visualize this setup, but not sure if I understand how you did it exactly. Did you make a sort of divided O2 housing with two chambers: one chamber for turbine discharge flow and the other side for wasegate bypass flow which routes bypass flow out through a tube to the remote gate.

I am just trying to imagine your setup. Thanks. Is this like a standard O2 dump up to a certain point? Like if you were to remove the flapper valve and mount on a traditional O2 dump but instead of venting to atmosphere the bypass gases flow into a remote gate mounted on the dump tube itself?

 

all i can say is u will love the sound

 

Keep in mind this is twin scroll, if you put an external gate on the manifold it has to vent from both scrolls. Typical setups include either a bridge from one scroll to the other on which the wastegate mounts or dual wastegates.

 

Do you have any proof to back up your bold claim? Tom Powell aka 9sec9 uses one of these without issue, as do many others. We have never had one of these units returned to us and we have sold several.

There are some people out there that hypothesize that there is an affect on spool due to reverberation between the scrolls being that they are not divided to the wastegate. Those claims have not been tested or proven to the best of my knowledge.

 

Hey chris I was asking mason about this the other day and he was a bit clueless, my question to u chris is will this work on a fp black? Will it help spool up faster? If yes and yes is the answer I'll probably want to give u a call and either talk to u or Adam, thanks for everything

 

Yes it will work on an FP Black, but no it should have no affect either way on spool. The purpose of this is to allow people to run very high boost levels (levels at which even the 25psi internal wg actuator would be blown open by exhaust backpressure) and have better boost control, so it all depends on what your goals are.

 

Does it help hold boost better to redline?

 

My friend in Texas is about to run the MAP EWG piece along with their tubular manifold with his FPRed, he's gonna update me on how the car feels and I'll let you all know.

 

Absolutely, assuming there are no other weak points in the system (turbo running out of steam, etc.)

 

I too am concerned about having the wastegate off the O2 affecting transient response. However i was advised since there is no flow through there unless the gate is open the effect is minimal to nonexistent.

 

I've been doing business with Maperformance for a while now and would like to switch to an external wastegate on my black but I must admit, ur statement holds water if u think about it, the best way to do this conversion would be dual wastegates because of the twinscroll, but then again alot of things make sense in theory, I defenetly want to keep researching.

 

So with a twin scroll the ewg could be on the o2 housing ur saying? Well I thought mapferformance had designed it that way? To me either a twin waste gate but costly would work or a waste gate right below the twin scroll which would be the o2 housing, am I correct? Also how would I go about keeping the flapper closed from the internal wastegate? Thanks for the info in advanced,