Just wanted to share some info I logged from my car. The before graph is the one without Manifold (Tomei) and O2 housing(tomei) installed. The after graph is with them installed. All other mods are same.

Mods:
Tomei o2 and downpipe, Garage HRS test pipe,HKS SpecR catback
Tomei manifold
ARC Induction Box
ARC Intercooler (079)
Ralliart IC and intake piping
Walbro
HKS EVC 6

Like the new boost curve a lot. Boost settings were same before and after the test. Also the car has 0-1 counts of sporadic knock only. Mostly none.

Inputs and comments welcome.

 

I wonder how much of that is the O2 housing. Could you repeat with the stock manifold back on the car? ;-))

 

No promises!

Although I think that most of it should be from the O2. The manifold I didn't even want to put on as I thought I might lose on the spool up. I usually do every mod one at a time. But for the O2 and manifold, I did them together, so no separate datalogs at the moment.

FWIW, the O2 mod is pretty good for holding more boost steadily, especially above 23-24 psi. Below that, I could hold just as well without the O2.

 

Thats call boost creep! Now show increase power instead of increase back pressure.

 

Can you please explain what you mean?

 

Thats not boost creep.. it's just holding boost a lot better. I've been thinking of swapping my o2 housing to hold more boost, thanks for posting this

 

The entire O2 housing thing is a gimmick. It causes more headaches than anything else.

It causes boost creep. Set your MBC to 20psi and watch it start to climb about that 5k rpm. Most people also fight a mid range overboost situation as well. Dial your car in at 22psi then nail the throttle at 4500 instead of 3000 and watch it go way to high and start knocking. Lastly... the bolts tend to loosen up causing a nice exhaust leak that needs to be corrected every few months.

There has not been a single dyno of a SS O2 housing alone that shows more power without upping the boost in the process.

Junk.

 

That's the whole point....

O2 housing allows for more boost OR same boost with less work for the turbo...

 

The thing doesn't make any more power at the same boost level.

And furthermore uncontrollable boost creep/spike is not what most people want.


ESPECIALLY ON 91 OCTANE!!!!

 

Boost creep depends on the brand of O2 housing you use. The bad ones (ebay and Megan) can cause boost creep. These are to be avoided. The good ones (Invidia, Works, Titek) do not cause boost creep. I have personally tested the Invidia and Works, but not the Titek.

The Tomei O2 housing, I have never heard of. Are you specifically familiar with the Tomei or are you talking about all the O2 housings?

 

I thought the ebay ones were meant to be pretty good...

 

The hole where the waste gate flow merges with the turbine flow often needs to be enlarged to prevent boost creep with moderate boost levels.

 

The Tomei 02 housing works pretty well. The really nice thing it has over all the other tubular 02 housings is that it has a tab to mount to the block like the stock 02 housing.

The price however is not so hot.

From looking at the OP graphs, that is not boost creep.

 

^ Its hard to say because he is spiking boost pretty high ....

.... it certainly doesn't mean he is making more power either. Airflow is power boost is heat. Having a corked up exhaust can also cause boost to climb.

I had very bad luck with a ceramic coated BR O2 housing which are supposed to be the "good ones". I would never trust the thing on 93 octane and surely not 91.

Looking at that timing I'm trying to figure out why you wouldn't turn down the boost and add a few * instead.

 

I think most the boost creep cars are having alot higher spiking that 25psi. Example...hits 24psi but creeps to 26-27psi then drops again. His is hitting 25psi and holding pretty well with very little fluctuation. Also 13* at about 7000rpm with 22lbs up top is actually quite good for IX's. I doubt he could add more timing even if the boost was less. Even his first graph was the same timing at only 20psi up top. That looks like a strong car to me.