I was working with the o2 housing last night and there is a lot of material that can be taken out. I was using a Dremel and ball grinder bit and got rid of the lip where it meets with the other pipe and took a good amount out from the center section. Ill be installing it this weekend and have an appt with TurboTrix on monday for a retune. Ill report back about if there is any boost creep.

 

pics? awaiting results anxiously

 

eve-slow: I sent a PM to the wrong person on here yesterday after the first PM I sent you. You need to clear your PMs too because you are all full. Anyway, I will buy your jet-coated O2 housing if you still have it and you get my messages. I did manage to get one through with my work email so hopefully you get that and respond. If not, I will check my PMs throughout the day. Thanks, and sorry for the confusion guys.

 

boost creep is not only caused by the wastegate port being too small. it can also be caused down stream from the wastegate port if the port from the wastegate to the downpipe is too small. in that case, you can port the wastgate port all you want but you're still going get boost creep. that's why people port the 02 housing and not the wastgate port on the turbo.

 

Question: I noticed the ebay O2 housing splits the exhaust gases whereas the Works new cast O2 housing doesn't. Meaning the split area on the Works O2 is removed or not cast in to the housing. Works claims to get rid of any boost creep and I can understand why when you have an additional path for the waste gate exhaust to escape to. A blended effect. My question is, the Works O2 housing is supposed to increase flow (ultimately gain hp/tq), how is that possible without a smooth transition of exhaust flow? There is now a barrier to overcome before the exhaust seperates in to the two paths. The Ebay housing keeps this seperation for a more precise flow out of the gate and combines them later. Or is the expected increase of hp/tq come from the larger volume of the Works housing. Not too much data on the Works O2 housing except that people who have bought it say that it increases hp/tq according to their butt dyno. Good discussion/comparison.

Dave

 

+1,

Boostcreep happens when the Exhaust gas iswnt relieved fast enough to slow the turbo, anything preventing this flow will cause creep.

 

In theory the split O2 housing causes less turblence upstream and lets the exhaust gas combine downstream which is supposed to net more power but ultimately is is the volume/size of the O2 housing the dictates how much additional power is generated as there is less back pressure. If the sizes are the same between the split and none split, the split should be slightly more efficient generating a 2-3 more HP ... hardly worth writing home about ...

 

Considering how small the wastegate flapper is I really dont think there is much of a need to port the wastegate exit hole bigger than 1.5".

 

In theory, can you have the reverse effect by too much volume in the housing?

 

I wouldnt say too much volume but the way the WG stream enters the exhaust stream could make a difference. I left mine stock and I am loving it. No problem with creep or spikes.

 

By reverse effect do you mean less or more turbulence? I would assume the larger the volume of the housing the less the HP robbing effect turbulence would have ...

 

Don't forget hot gas benefits from velocity.

 

Don forget that when hot pressurized gas is allowed to rapidly expand it cools down very quickly.

 

Which is a bad thing.