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Old 06-02-2008, 06:46 PM   #51
hwy61
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Go for it Phatron......I'm sure we would all like to see the results.

Sound like you are on the right track blue car with that launch. You must take out all drivetrain slack before dumping the clutch and it sounds like you do. Here is my description of the best launch technique I've come up with, no launch control. It would be very desirable to launch under a lot of boost but that isn't really possible as the engine needs a load on it. As you approach the line take out drivetrain slack with just a bit of clutch engagement, rev to 3,000 rpm and hold that, at go time floor it watching the tach, as the needle passes 4,500/5,000 rpm let it loose. This happens very fast so be ready. You will build appx 3 or 4 psi of boost due to the engine spinning up the flywheel and there will be no bog in rpm's to speak of. This is really important for coming out of the hole or off the line at full power. You will spin the tires appx 8' to 10' and be gone. Shift, don't hit that rev limiter.

When I say spin the tires, I don't mean you will be sitting there spinning like a Mustang, you will be digging in as only an STI knows how and you will be impressed at how smooth the launch is under power and with a little wheel spin. Don't try it too often, gas and tires cost too much these days. Hwy61
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Old 06-02-2008, 06:55 PM   #52
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thanks hwy
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Old 06-03-2008, 11:42 AM   #53
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When I ran my car with no cap (accident) oil did come out. Small amount of drops on the hood under splash.

As for the breather set up, no oil has splashed on my cap. No oil splashes my stock cap too.

I thought about the screen falling off, then checked the cap...its not going anywhere I really dont think you need the second screen, as NO OIL splashes. Also the first screen, the breather is enough.

Remeber I got the Mesh one.

Part Numbers:

Oil Cap 11110
Breather 3995


Quote:
Originally Posted by WRX4ME LE 482 View Post
Im gonna have to construct something like this. Ill be able to tell if it's helping at all.

BUE, is it your impression that if the entire cap is left off for a few 4th gear pulls (2-6k), oil wont shoot out or anything? If it's safe, Ill do some pulls back to back with pulls of the cap on. Ill get the proof.
The breather tube that sticks out of the breather has an opening of probably a pencil size, so the air flow is very small.

Quote:
Originally Posted by flatthump View Post
But you're going to get a bunch of crap in your crankcase. Dust etc...

Where is your oil level at BUE?

When I take the cap off and put my ear up to the oil filler (at idle) little drops of oil fly out into my ear
Oil is normal. I am getting it changed again today...i do it every 1000 miles

So my oil is constantly checked.



So after removing my blow off, i noticed a slight difference with the breather.

The car physicalt feels as if you traded 5 ponies for 5 torque points..thus relating to the slowness of >2,000 rpms?

Here is a pondering question:

Will having the oil vent to the hood cause poison gases to enter the car? Via a/c or heat or just air flow??
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Old 06-04-2008, 11:53 AM   #54
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It would be interesting to tap a pressure gauge into the crank case to see what the actual pressure is inside of the case during high load, high RPM operation... it wouldn't be hard to drill/tap a fitting into the oil cap.

-Dave
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Old 06-04-2008, 11:59 AM   #55
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Gunna try it dave ?
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Old 06-04-2008, 03:31 PM   #56
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Quote:
Originally Posted by bue car View Post
Gunna try it dave ?
I would love to but I just don't have time right now. If it added it to my "to do" list it would be item number 153.

Maybe when I get a little bit of free time...

-Dave
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Old 06-04-2008, 04:10 PM   #57
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interesting discussion. my congratulations to the op for having the balls to risk posting it.
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Old 06-04-2008, 07:07 PM   #58
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Phatron and others are right: this is, of course, metered air. The STi block already has two breather passages, but a third shouldn't hurt anything provided you shove it back into the post-maf intake. Frankly, however, if the first 2 breathers aren't cutting it you probably have a severe enough blowby issue that it won't be resolved by adding another - rather, you need a lower end rebuild. Nonetheless, it might help extend the life of high time motor with mediocre leakdown numbers, but it won't "fix" it.
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Old 06-04-2008, 07:12 PM   #59
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Im just a sucker for sweet ideas
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Old 06-05-2008, 12:54 AM   #60
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Where are the datalogs?
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Old 06-05-2008, 01:27 AM   #61
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Quote:
Originally Posted by MeetMrGlock View Post
interesting discussion. my congratulations to the op for having the balls to risk posting it.
Actually I Googled PCV valves and related issues and this is an old topic having been actively discussed at numerous boards including several other Subaru Forums. Emission controls vary from car to car and year to year and are quite complex. Hwy61
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Old 06-05-2008, 03:19 AM   #62
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Quote:
Originally Posted by ciper View Post
Where are the datalogs?
my AFR gauge took a poop....i think i ripped out a wire when i was removing some weight. ill try and get to it this weekend.
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Old 06-05-2008, 04:51 AM   #63
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im very interested to hear the results of this also
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Old 06-06-2008, 01:45 PM   #64
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I'm still waiting for a logical explanation of how an additional breather would increase boost. This topic is discussed regarding V8s etc with no turbo. It seems to be perhaps one of those urban legends running around that if you remove the oil cap your engine will run better and with more power. So what gives, someone hook up a boost/vacuum to the oil cap and compare the difference in the boost pressure solid cap vs vented cap and what is going on inside the block. I'm on the doubt it end of this so I'm not doing it. On the other hand I can tell you that on my car, Doug was tuning it at TopSpeed and was nice enough to do a run with the stock, rear muffler off which was the only stock piece on the system excluding headers. WHP gain....37.

I can't see how there can be much going on pressure wise inside the block with a PVC valve and vents but who knows what strange things happen at 7,000 + RPM. Hwy61
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Old 06-06-2008, 01:55 PM   #65
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Quote:
Originally Posted by hwy61 View Post
I'm still waiting for a logical explanation of how an additional breather would increase boost. This topic is discussed regarding V8s etc with no turbo. It seems to be perhaps one of those urban legends running around that if you remove the oil cap your engine will run better and with more power. So what gives, someone hook up a boost/vacuum to the oil cap and compare the difference in the boost pressure solid cap vs vented cap and what is going on inside the block. I'm on the doubt it end of this so I'm not doing it. On the other hand I can tell you that on my car, Doug was tuning it at TopSpeed and was nice enough to do a run with the stock, rear muffler off which was the only stock piece on the system excluding headers. WHP gain....37.

I can't see how there can be much going on pressure wise inside the block with a PVC valve and vents but who knows what strange things happen at 7,000 + RPM. Hwy61
While i agree on some points, i think the mods or OP should change the heading, as this discussion talks about everything buy hp gain
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Old 06-06-2008, 06:19 PM   #66
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Quote:
Originally Posted by hwy61 View Post
I'm still waiting for a logical explanation of how an additional breather would increase boost.
It shouldn't. If you drop pressure in the crankcase you may actually blow more boost past the rings. I'm sure boost would go down a little bit.

And yes, this topic isn't about making more horsepower imho. It's just about modifying the PCV system to support higher than stock boost pressures.
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Old 06-07-2008, 01:35 AM   #67
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now what's the word on a normally aspirated car?
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Old 06-07-2008, 03:19 AM   #68
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Me again, checking back in....my THEORY is since there is a lack of crankcase pressure the pistons travel is less restricted....maybe?? Thats why the engine's acceleration is felt to be "like accelerating downhill"
I don't recall an extra boost just felt like more power when I left the oil cap off by accident.


If someone does embark on this task of datalogging and running a gauge on crankcase pressure, and etc.

edit- and log with wideband, as the crankcase is venting some metered air (however much it may or may not be it's still metered)
also engine load should be lower with the cap off or vented....
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Old 06-07-2008, 09:12 PM   #69
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^^^I agree with ol' chizzlechest here. It makes sense to me that the reduced crankcase pressure would allow the piston to move down the stroke with less resistance. But then again, the "pressure" in the crankcase would be zero'd out as the next piston simultanously moves UP the stroke.... discuss.....
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Old 06-07-2008, 10:05 PM   #70
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Quote:
Originally Posted by Nicklz View Post
Me again, checking back in....my THEORY is since there is a lack of crankcase pressure the pistons travel is less restricted....maybe?? Thats why the engine's acceleration is felt to be "like accelerating downhill"
I don't recall an extra boost just felt like more power when I left the oil cap off by accident.
the pistons traveling up would be affected in the opposite manner, the equal, but opposite effects would cancel each other out
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Old 06-08-2008, 08:13 PM   #71
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The crankcase pressure situation has "ALMOST" been perfected in sport bikes. Especially Suzuki GSXR Lineup.

http://www.mcnews.com.au/newbikecata...2003_Page1.htm

Just read that, they've changed a few things but pretty much sums up crankcase breathing on NA engines.
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Old 06-09-2008, 07:46 PM   #72
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One of you has to have a Tactrix cable. Start Romraider logger and do a 3rd gear run from 2k rpm and post the results. Until then I call shenanigans.
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Old 06-10-2008, 03:00 PM   #73
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i can not find mine anywhere or I'd have been on this already
I'll try to borrow someones this weekend.

Idea's on how to monitor crankcase pressure?
I have a lc-1 (wideband o2) so that can be monitiored
borrow a tatrix and data log everything

A/F ratio is my major concern since it is a loss of metered air and affects of zero/less crankcase pressure on the piston rings (blowby, which i have no idea how to measure)
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Old 06-10-2008, 07:59 PM   #74
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Someone just go post a link to this in the Open ECU forum and ask someone with a wideband to log.

My assumption here is that since you are messing with metered air and folks are reporting more power on their butt dynos then they must be running leaner, therefore gain a little power....just like some of the intakes on the market, not really gaining hp due to increased flow, but rather because you are f*kcing up the MAFv.

If this is the case, then the same results could be had by simply leaning out your AFR with enginuity.

Quote:
Originally Posted by JSarv View Post
The crankcase pressure situation has "ALMOST" been perfected in sport bikes. Especially Suzuki GSXR Lineup.

http://www.mcnews.com.au/newbikecata...2003_Page1.htm

Just read that, they've changed a few things but pretty much sums up crankcase breathing on NA engines.
"the addition of new ventilation holes between adjacent cylinders" thats a little different than what we are talking about here.




If you know how PCV valve works....vacuum source (IE turbo) is "sucking" the air out of the crankcase, then by opening the oil cap you are merely giving the turbo another "post MAF" (IE unmetered air) source, which would cause you to run leaner.
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Old 06-10-2008, 09:08 PM   #75
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Seriously don't any of you own a farking tactrix cable? You don't even need a wideband. Just monitor rpm, boost error, relative manifold pressure, injector duty cycle, engine load and the front 02 sensor. Injector duty cycle alone should tell us if more fuel is being added when the cap is off and the Subaru 02 sensor might be sensitive enough to see the difference.

Quote:
Originally Posted by Phatron View Post
then by opening the oil cap you are merely giving the turbo another "post MAF" (IE unmetered air) source, which would cause you to run leaner.[/b]
This is my thought as well.
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