o2 housing porting, remove the center section a little?

[ApexVIII]

i have seen some o2 housing ported and the center wall between the o2 flapper and exhaust output was removed a little, is this a good idea??

here i found a picture...

 

[TjPhillips36]

I believe it helps improve flow from the wastegate and improve boost creep.

I don't know if this article will help or not but check it out...
http://www.vfaq.com/mods/porting-O2.html

 

[ApexVIII]

I believe it helps improve flow from the wastegate and improve boost creep.

I don't know if this article will help or not but check it out...
http://www.vfaq.com/mods/porting-O2.html

yea i read that and he did not remove the wall he just opened both ports up,

i saw another one on ebay and the guy removed the wall in between them about 3/4" down i was wondering if i should do that or if anyone has, other then the one i saw on ebay

 

[scottd60]

Here are some pictures of our ported EVO O2 housing from Forced Performance...maybe it will help.

Scott

 

[ApexVIII]

Here are some pictures of our ported EVO O2 housing from Forced Performance...maybe it will help.

Scott

yea thats how i ported one of mine, but the one i saw had the wall in between the waist gate area and the regular output of the exhaust was removed.

i guess ill just leave the wall there, it seems no one ports it like that so it must not really matter

 

[kmoore]

yea thats how i ported one of mine, but the one i saw had the wall in between the waist gate area and the regular output of the exhaust was removed.

i guess ill just leave the wall there, it seems no one ports it like that so it must not really matter

Wait what? Is this on a stock O2 housing or Evo3? And you're saying that the wall was COMPLETELY removed?

 

[ApexVIII]

Wait what? Is this on a stock O2 housing or Evo3? And you're saying that the wall was COMPLETELY removed?

it was a 2g i saw, it was completely removed until about 3/4" inch down

 

[kenamond]

I think Dejon sells housings with the "undivided mod" where they chop the divider between the WG and turbine outlet. I think it's a stupid idea myself, and there's a thread where the topic is debated. Sure, it will help with boost creep, but so will putting a stock exhaust on.

I think the vfaq article actually talks about scalloping out *part* of the housing, because the WG flow splatters off of the WG flapper and smacks into the divider. But they don't have enough pictures in the article to know for sure. My take on it is that you scoop out some of the divider where the WG flow would hit it so that the WG flow gets redirected toward the O2 housing, thus improving WG flow and decreasing creep. But this would not cut all the way through the housing.

 

[ApexVIII]

I think Dejon sells housings with the "undivided mod" where they chop the divider between the WG and turbine outlet. I think it's a stupid idea myself, and there's a thread where the topic is debated. Sure, it will help with boost creep, but so will putting a stock exhaust on.

I think the vfaq article actually talks about scalloping out *part* of the housing, because the WG flow splatters off of the WG flapper and smacks into the divider. But they don't have enough pictures in the article to know for sure. My take on it is that you scoop out some of the divider where the WG flow would hit it so that the WG flow gets redirected toward the O2 housing, thus improving WG flow and decreasing creep. But this would not cut all the way through the housing.

i see, so i should take out a little bit of the wall out?

 

[kenamond]

i see, so i should take out a little bit of the wall out?

In the vfaq article, they talk about how you can see where the WG flow hits the divider. They use that as a reference and try to port out a contoured section so the flow doesn't hit a flat wall...it hits the ported part at more of an angle, sending it toward the O2 housing. I think one of the pictures has some thin lines outlining where they cut it away, but I don't recall seeing an after picture focusing on that part of the porting. I don't know how good of an idea it is; it might make the housing more likely to crack when you thin out the divider, and maybe it's just fine.

If you do decide to take a bit off, I'd recommend applying pressure to the WGA with everything together and finding out where the flapper stops moving (when the WGA arm is fully extended). Then use that to get a sense of where the WG flow would be hitting the divider as it splatters off of the flapper disc. I've never done it, but that's what I'd do if I were going to do it.

EDIT: I just went and looked at the vfaq porting article. They talk about what I mentioned in the O2 housing porting page, not the turbine housing porting page. 6th picture down with the thin red lines drawn on the picture. Link is below.
http://www.vfaq.com/mods/porting-O2.html

 

[ApexVIII]

In the vfaq article, they talk about how you can see where the WG flow hits the divider. They use that as a reference and try to port out a contoured section so the flow doesn't hit a flat wall...it hits the ported part at more of an angle, sending it toward the O2 housing. I think one of the pictures has some thin lines outlining where they cut it away, but I don't recall seeing an after picture focusing on that part of the porting. I don't know how good of an idea it is; it might make the housing more likely to crack when you thin out the divider, and maybe it's just fine.

If you do decide to take a bit off, I'd recommend applying pressure to the WGA with everything together and finding out where the flapper stops moving (when the WGA arm is fully extended). Then use that to get a sense of where the WG flow would be hitting the divider as it splatters off of the flapper disc. I've never done it, but that's what I'd do if I were going to do it.

EDIT: I just went and looked at the vfaq porting article. They talk about what I mentioned in the O2 housing porting page, not the turbine housing porting page. 6th picture down with the thin red lines drawn on the picture. Link is below.
http://www.vfaq.com/mods/porting-O2.html

i see, i added a picture at the top of how the one on ebay was ported

 

[kenamond]

i see, i added a picture at the top of how the one on ebay was ported

Yeah, I saw the picture...I wouldn't recommend doing that. Are you having boost creep problems? If not, definitely don't do that. If you are creeping, there are a number of other options...but if you remove the divider, it's kinda hard to undo.

 

[ApexVIII]

Yeah, I saw the picture...I wouldn't recommend doing that. Are you having boost creep problems? If not, definitely don't do that. If you are creeping, there are a number of other options...but if you remove the divider, it's kinda hard to undo.

yea true, i havn't put the 16G on my car yet, i already did the 34mm flapper so i dont think i will have any.

yea i wont do it untill i have it on the car and only if i have problems.

thanks alot!

 

[GSXeclipsePSI]

Ok I bought a new turbo its a SCM-6152e with internal gate and undivided hotside. Now I have the evo 3 o2 houseing from FP ported. Now since the turbo has the undivided do I have to do this mod to the o2 housing? Or will it help. I wanna run as much boost as I can off the internal gate.

 

[GSXeclipsePSI]

Well I didn't remove anything and don't seem to be getting any creep so I answered my own question. Only thing I did was cut out the area of the gasket that would have been been in the gap.