OIL CATCH TANK increase performance?

[jronald]

...
and I thought catch tank is for dry sump system...
lol

[mojoyaris]

Originally Posted by cleong

If you had a stock AFR chart you'll see that the car runs roughly stoichometric till about 4000+ rpms when it goes very rich.

But compared to another engine it runs pretty lean in comparison, doesn't it?

Everyone who's had it dyno'd always say that the engine runs lean. Of course the VVTI is something else and then it turns into another animal altogether.

[cleong]

On the graph I saw, the AFR went to around 10. I've not seen that many AFR charts, so I don't know if you consider that as relatively lean compared to other engines.

[largeorangefont]

Originally Posted by cleong

On the graph I saw, the AFR went to around 10. I've not seen that many AFR charts, so I don't know if you consider that as relatively lean compared to other engines.

No, that is rich for an N/A car.

13:1 across the board is fine on a WOT pull. A good tune with timing and fueling adjustments should pick up about 10% on these cars.

[cleong]

In a previous post I said it went very rich at high rpms but mojoyaris said that it was relatively lean. Hence the question I asked.

[justjesus]

Originally Posted by 33lam

will the oil catch tank increase the car performance??

I knew I ran into this in a recent magazine. I went home and found the article. It's a section called Fact or Fiction in Import Tuner Magazine.

This is NOT my opinion, my own findings, nor my theory

As quoted from the October 2008 issue:
"Traditionally added to keep cylinder heads and intake tracts vented and clean, rather than to increase horsepower..."

They tested an oil catch can on a SR20DET-swapped 240sx. Both an oil catch can and a breather filter (from Autozone) were tested, which included some dyno pulls.

Their findings:

"Not only did the catch can make pwer; we could actually see how it worked."

They included a dyno graph. The bigger gains were between 2500 and about 3000 RPM, then again starting around 5200 RPM.

The average whp with the breather filter was 242.8, while the average whp with the catch can was 244.3.


Hope this helps.

[mojoyaris]

so I wonder if it's the vvti that makes it run rich at high Rpms, but lean at low to mid rpms. I'm happy with the catch tank n the engine, but wouldn't mind entertaining a piggy back system to tune it to run richer at mid range.

[revoturbo]

oil catch tank improve engine bay cosmetic. not add performance..

[mojoyaris]

Originally Posted by revoturbo

oil catch tank improve engine bay cosmetic. not add performance..

I don't think you've been around cars much, but people in the
Racing community would beg to differ. I've made these out of pop bottles and tubes in past cars. So it's not about cosmetics for me

[largeorangefont]

Originally Posted by mojoyaris

I don't think you've been around cars much, but people in the
Racing community would beg to differ. I've made these out of pop bottles and tubes in past cars. So it's not about cosmetics for me

Since it is not a racing engine, it is not that big of a deal. Race engines do not need a PCV system for emissions compliance, they run breathers and catchcans. If you change your PCV valve occasionally you dont need a catch can on a 1.5L low output NA economy engine.

Look into one if you run a forced induction setup.

[largeorangefont]

Originally Posted by mojoyaris

so I wonder if it's the vvti that makes it run rich at high Rpms, but lean at low to mid rpms. I'm happy with the catch tank n the engine, but wouldn't mind entertaining a piggy back system to tune it to run richer at mid range.

No, it is the engine mapping that dictates the fueling. VVTi has nothing to do with it.

[contraband831]

Oil Catch Cans are just eye candy in the yaris.