From what I have seen on the dyno from running more boost through the midrange compared to not, I would place bets that he has gained a healthy amount of power area under the curve in the midrange for sure.

Looks like he is running about 2-3psi more to about 6k, with only about 1* less timing.

Here is a good example of some findings from my personal evo. This is on 91 octane so I was quite timing limited.

Difference between 25.5psi and 27.5 psi:

 

how much timing could you run on both those psi's bryan?

 

Not much.



AFR was about 10.9-11.0

27.5psi peak, 26psi @ 6000 rpm, 22psi @ 7800 rpm.

295 2byte load @ 3750 rpm, 260 @ 7000, 235 @ 7800.

2090 2byte airflow @ 7600 rpm.

42 lbs/min @ 7300 rpm.

 

That's better than mine on 98RON (93oct??):



I was however getting a fair bit of knock (6) during spool, so that's why my timing at peak is down.

 

I admit I know nothing about tuning 91 octane and I hope I never have to learn!

All I'm saying is that I had boost control problems with the BR O2 housing. It definitely created boost spike and creep issues for me especially in the midrange.

Maybe his O2 is working out well and mine was complete crap. I've been dealt that hand before. I would simply like to see him log a 21psi pull as that is where I had issues.

My pump gas maps are all set to 21psi. I simply couldn't get the boost to stay at 21 as after the O2 it always spiked to 25 and lingered around that point. I run aggressive timing and tame boost on pump. I do this because I see better results after prolonged exposure to WOT festivities. The O2 housing I had screwed up many hours of vigilant tuning simply because boost was all over the place.

Its not just me.... there are crap loads of threads all stating the same thing. I suppose if you run alchy/meth, race gas, or conservative timing it might be a wash but that doesn't mean the part is working like you think it is.

I actually hope its working for him. I hope he does another log at 21psi just to prove me wrong. I would be nice to see a part actually work.

 

Hey Jeff,

Sorry I think you misunderstood my post. I am no way doubting that some 02 housings have the creep issue. I've seen it a bunch of times on the dyno and 100% agree with you.

The problem ones have too small a wastegate hole. The ones with larger holes do not exhibit this problem. I know titeks work great. We've actually swapped ebay ones that creeped for titeks and problem solved.

Some ebay ones are ok. It's a crap shoot. I tell anyone that wants a 02 housing installed to look at the WG hole first before going to the trouble of installing it because it's such a pita to do twice.

I've also seen a couple *not* creep with the stock turbo and as soon as it's upgraded to a FPgreen, creep city.

 

I guess I don't understand where all the claimed power is coming from. Is it from knock resistance? Is it from better exhaust flow? I find that very hard to believe myself. The stock snail certainly isn't out flowing the stock O2 housing especially at 40lbs of airflow.

I'm guessing that most people simply have crappy boost control.

 

I would for sure agree with you on that.

 

Well the o2 does have better exhaust flow. 2.5in outlet helps when you are striving for every bit of HP. Usually there is quicker spool and allows a tiny bit more boost. I have actually seen where the Titek provided a better overall boost curve such as above.

As far as the Tomei it's what you would expect for the $$$. Wastegate passage is very nice and fitment is just like OEM. I believe it is sized at 60 or 65mm IIRC. Only thing I don't like is it required there downpipe which gets rid of the donut gasket for a flat gasket.

The buschur one well lets just say those ebay specials don't work too hot. I never even put mine on. I pulled it out of the box and right on the FS section

 

Those Titek ones "look exactly" the same as the ebay ones.

presumably they are different?

 

They are different inside quite a bit. Theres a thread somewhere showing the difference but the wastegate hole is much bigger and the welds much nicer.

 

I will try to do a 21 psi log. My tuning is also not finished, so, I will bump up a degree or so to see if I encounter any knock. Will post up my logs as soon as I am done.

 

Hold one in your hand and they won't look the same.

 

But we are talking about low boost on a stock turbo.... Its not doing anything for a 91 octane tune.

 

I'm pretty sure that Titek is the same Ebay unit that is sold by BR and Megan. And some others that i'm forgetting. If you mean that it looks prettier outside - sure, maybe they put a coat of chrome on it. Maybe they machine a bit on the inside too. It's still the same unit. I mean there's a couple of slightly different models that come out of ebay too btw. All that those vendors do is affix their nameplates on it.

This whole O2 housing thing is just as overblown as debates on LICP's gains and differences.