#2. The downpipe donut will not seal properly against the o2 flange unless you unhook the downpipe from the testpipe/cat and tighten down the downpipe first. (Very annoying)

So thats the key to get it to seal ! I like this 02 housing, it just didnt make sense to have a full 3" exhaust and the 02 housing exit only 2 1/2.

 

Nice tests. Is there a reason you also didn't test the MAP o2 housing. Heard it is alot bigger then the megan one, so I think it should flow pretty well, plus it is ALOT more affordable then the WORKSone.

 

yep. ya i like it also. Whats bad though, is it will kind of seal to the point you dont think you have an exhaust leak, when reality its leaking.. i figured this out after i kept getting bad o2 sensor cel's and then realized something wasnt right when tightening the bolts down they would feel weird so undoing the downpipe from the rear of the testpipe/cat gives you enough room to seal it up good then just stretch the downpipe to the testpipe/cat and you're good to go!

Not cool for something that cost $200 though to have fitment issues.

 

The MAP one is the same as the Titek V2. And yes, its bigger internally, but still uses a 2.5" outlet.

 

so Titek v2 is not worth getting it over megan? I thought smooth+bigger interior of titek v2 makes more power.

 

Why do you feel it is "silly" for a part like this to respond better at certain boost ranges?

Makes sense to me simply because the exhaust is splitting into two flow paths. At low boost, you have a larger portion of the exhaust going through the wastegate. An O2 that focuses on wastegate flow will likely do better here. At high boost, turbine flow is likely to dominate and then you just don't want the wastegate flow messing with the turbine flow path.

Same goes for other parts. They can perform better when given conditions that may accentuate their strengths. High overlap cams for example work great at lower exhaust back pressure levels. Put a lot of exhaust back pressure on them though and they turn into an EGR system.

 

Who cares! I only hear my dump once a month when I floor it... that's it

It would be another 25hp more than the works

Mikey

 

Robert actually didn't. He had an "external wastegate" however, he had a std recirc Works 02 housing . His wastegate was on the downpipe and was really nothing but an expensive exhaust cut out regulated by boost. re-leaving some of the back-pressure post turbine wheel. Not near as efficient as a true external dump.

Mikey

 

Bump for Jays thread. I read it another time and glad I'm going with something new for my O2

 

Really? Really? Let's not open this can of worms again! Everybody has had different results on different setups. That's pretty bold to make a blanket statement like that.

Being in California and testing a dump would be quite different than running one on your car also. Testing would crack that thing open repeatedly. My car with a dump on low boost used to crack open all the time. It got rather annoying. I could see how that would not be the case on higher boost high hp setups though.

 

Cool compare.

If a 2.5" dp is going to restrict power, why wouldnt a 2.5" o2 housing outlet!!

3" all the way, is the way.

Now how people implement their splitter is another thing!!

 

3in all the way. FTW helps spool and the dump will help boost control. And both increase power

Mikey

 

It's never seemed quite that simple to me given the size of the exhaust wheel on a stock frame turbo. Given how close the O2 housing opening is to the exhaust wheel and how short it is in length, I think it's not necessarily the same analysis as sizing exhaust parts further downstream.

 

So, do you guys agree, in general, that on a stock turbo, and lets say---an Ebay O2 housing (with the same-as-stock 2.5" outlet ), mounted to a quality 3 inch DP & exhaust we will not see much horsepower gain over a O2 housing that has a 3" outlet with the same DP, exhuast???
Tell me your opinion, please.

 

No opinions, just facts, but here it is, any pipe that has a larger diameter than turbine exducer outlet diameter [where the hotside mounts to O2 housin] will provide no increase in flow, except for slight diameter increases for temperature change.

Bottom line is keeping pipe straight with no sudden bends and decreases or increases in diameter.

In fact the most ideal, disregarding practical, exhaust for a turbocharged car like the evo would be to have no exhaust, just the hotside turbin housing/wastegate open to atmosphere