I am currently running a ported Megan o2 housing.

When I got it back from porting the guy who did the work only took out about half of the divider wall. I was a bit pissed and asked him why he did not completely remove the divider wall and he told me it is necessary because if nothing was there too much turbulence would be caused, and a loss of power would happen. He also said no divider wall can cause boost creep.

Anyway I asked around and the consensus was that too much turbulence is no good, so you want somewhat of a divider to allow the separate gasses to join together smoothly. When you port an o2 housing you want to open it up, but not completely get rid of the divider wall. I was satisfied with all the answers I got and I left it as is.

Recently I have seen people using the Titek V2 and Invidia o2 housings and supposedly they make the most power. Neither one of them has a divider wall. I have asked around and now people are saying no wall is the best way to go.

Can anyone chime in who has some real input on this.

 

Hard to believe nobody has more information on this.

Anybody have dyno sheets comparing an o2 housing with a divider wall versus one that doesn't?

 

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Im curious about this as well.

 

Where is the O2 housing shootout thread with stats on dumps included?

*warms up popcorn popper*

 

I think you are going to find that all any divider does regardless of if its in the housing or dump is to prevent the gasses exiting the waste gate being aimed sideways into the the turbines outlet stream .

Also the gasses exiting the turbine are often spiralling and you want to stop it doing this because the shortest path to atmosphere is along the pipe not spiralling down it .

A very short divider may have function but I doubt a long one has .

A .

 

If it takes less energy (lower pressure drop) for the flow to stop spiraling and go straight, it will on it's own without you forcing it to. I've done a little FEA on this exact topic just out of my own interest and that is exactly what I saw. The flow spirals hard out of the turbine but the helix length quickly lengths and straightens out. If you try to force it to stop spiraling though at a rate that it doesn't want to do naturally, the pressure drop increases.

I feel keeping them divided for as long as possible is best. However, I also feel the best place for a flex joint is near the area the stock one is located since it will eliminate any bending moment in the downpipe and allow maximum movement without inducing any real tension in the joint, allowing the use of higher flowing ball joints over the braided corrugated tubing. You need to have them rejoined by the time you reach that joint anyway so it limits the dived flow length to 6-8".





For internal gates, all the dumps I've heard you can hear leak a bit under off boost conditions. The stock wastegate valve doesn't seal as well as an external gate. I don't care much for the external dump sound anyway, although it is worth some power on some setups.

 

When porting the wall of the 02 housing is it important to make sure the edges of the wall are smoothed out so the ported area doesnt have sharp edges? Im just asking in general, not criticizing the port work in the above pics.

 

Sharp edges will concentrate heat and lead to cracks.

 

03whitegsr, what O2 pipe is that? It also has the mount for the block bracket fo rsupport.

I wont comment on the bolts and SS safety wire, I already been to that bench stock - lol

 

Just something I built, 321 stainless 0.049 wall. No support bracket, it's too thin to support anything anyway. Schedule 10 316 manifold supporting it, although it would be better to support it as well to take the weight off the studs. That small boss is to hold the stock heatshield.

Those are just standard socket head cap screws and 0.040" stainless wire from a hardware store. Nothing special. Just threw them in a drill press and drilled them for the wire. I'll probably get some NAS hardware for the next setup though as these have rusted to all hell.