I cant say for sure if they make more power but I know they do not hurt. We run them on a lot of cars and they seem to do well.

Felix, Your car is a great example of how freeing up power is better than making power. Its easier on the car in every way.




-Em

 

Buschur did a comparison a few years back. (SEE EDIT BELOW) Basically, with the eBay tubular housing and a tubular manifold they gained 11whp and the boost increased about 1.5 psi I think. that is the test that is always quoted. It could be estimated that actual gains from the O2 housing were around 8hp as they gained 3hp from the manifold alone in a previous test.

But, understand that the gains from the EMP housing are not because it is a dump style. The gains were mostly made in the turbine outlet, not the dump section. The dump tube was changed very little during development and power kept increasing with better designs for the turbine tube.

So, when shopping for an O2 housing, get the one with the smoothest flow from the turbine to the downpipe. You don't want one that dumps exhaust right in to the back wall of the piece like the stock design.

EDIT :: Buschur made 13hp total with the O2 and manifold, and 2hp from the manifold alone, so 11hp from the eBay style housing.

 

Buschur 15WHP Search!

 

Well, I found the post where Q posted the initial gains of the prototype v the stock housing, but it seems that the images have disappeared with the whole thing with EPM stopping production (or maybe it's just this hotel internet connection). Here is the link in case they show up for you ...

https://www.evolutionm.net/forums/5555091-post417.html

 

Right, that's the one mentioned by Carlos that we discussed earlier.

I'm just not qualified to discuss flow characteristics and their constraints, and then apply them to a different set of conditions. As a simple guy who'd never install an open dump on his car, where can I find documented gains from an O2 housing without an open dump? Did EPM develop such an animal in their testing? Is there a dynograph showing the difference and the relative gains?

Please understand that I'm not trying to put you on the spot, nor am I asserting anything other than a desire for some hard data. In fact, your comments and clarifications are much appreciated.

 

What about compensating for the additional boost?

 

That's an excellent point and something to consider for anyone thinking about modding his Evo.

 

I understand. When I was testing the O2 housing for EPM I did everything in my power to assure that the results were accurate and complete. In the end, we tested the final version on my own car and logged boost for accuracy, only to find that I had a boost leak about 3 weeks later. That did skew the results, but even so, the EPM housing performed better than the tubular O2 without boost leaks.

As far as the recirculated O2 results, I cannot weigh in on that. I too am honestly skeptical of the results from Buschur. Not only about the boost differences, but about testing the O2 with a tubular header that was not part of the baseline. The 2 parts together could easily skew the results a few hp.

But, in Buschur's defense, he never expected gains from the part and actually did the comparison to show that the part didn't work ... and was surprised when it did. That's why the test was not as exact and complete as others.

But, that said, the EPM design results prove, at least in theory, that there are gains to be found in that area. If a recirculating O2 is designed in a similar fashion with the same principles in mind, there is no doubt in my mind that similar results could be achieved.

 

On a strictly personal note, I think that it's folks like Buschur Racing and STM that give this industry a fighting chance.

Fair enough.

 

I dont have a fancy graph to show but in my personal opinion o2 housing set up can get you some gains. I did notice my turbo spooling a lot quicker after my o2 housing installed.

 

Certainly a good tune will also help.

 

o2 housing in general no matter what brand or design will make power over it's stock counterpart.

 

I think that is the point. Less back pressure=more boost and obviously less falloff. If you increase the turbine exit area you will have less pressure the turbo has too fight against so yeah boost will increase and fuel had to be added to compensate.