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Old 03-30-2014, 03:39 AM   #1851
gdoggmoney
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Williaty: did you ever swap fuel pumps to something with greater flow on a car with the resonance? I get the feeling that the fuel pump duty cycle increase/decrease by the fuel pump controller may contribute to this a fair bit as well as the resonance itself and voltage spike/drop with the duty cycle change.

Curious. At least my 07 2.5i is not fully return less, it has a smaller return line and a walbro brought all my fuel trims down in both directions fairly dramatically. I've stared at too many maf scaling scatter plots to know a radical change. It exists, but the swings seem much more tame and bucking stuttering dramatically less.
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Old 03-30-2014, 03:45 AM   #1852
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Quote:
Originally Posted by gdoggmoney View Post
Williaty: did you ever swap fuel pumps to something with greater flow on a car with the resonance? I get the feeling that the fuel pump duty cycle increase/decrease by the fuel pump controller may contribute to this a fair bit as well as the resonance itself and voltage spike/drop with the duty cycle change.
That's definitely not a contributing factor. First, the changes are completely accounted for by mis-metered airflow. Second, the problem is completely eliminated by correcting the problem with airflow metering. Third, the fuel pump is being asked to supply this much fuel and more "honestly" higher in the rev range and it does so without causing any problems.


Quote:
Curious. At least my 07 2.5i is not fully return less, it has a smaller return line
There's an evap line in that area for cannister and tank pressure regulation and purge. That might be what you're talking about.

Quote:
and a walbro brought all my fuel trims down in both directions fairly dramatically. I've stared at too many maf scaling scatter plots to know a radical change. It exists, but the swings seem much more tame and bucking stuttering dramatically less.
IMO, that means you had a problem with your stock parts as I've never seen that with any other car.
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Old 03-30-2014, 03:52 AM   #1853
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I had my wife go drive it and she said it drives better than when we bought it with 35,000 miles in 2010. I wonder if it just had a lame fuel pump.

Ill have to do more logging, but the trims show in the logs the spikes in -/+ are 10% -15% less at max. Not proper but dramatic.
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Old 03-30-2014, 03:53 AM   #1854
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Could be a pump that was bad from the factory or the first owner could have done mean things to it. Also could have sucked something up somewhere along the line.
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Old 03-31-2014, 09:08 PM   #1855
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So, I finished mine.



Interior sound video:



Exterior and interior (I just cleaned it, completely irrelevant to intake, but...) photos:



Sample photo:





I'd give it a 9/10. Sound beastly, and, according to butt-dyno, adds power. I used a 45 degree first bend to keep it as far away from the intake manifold and block as possible, to keep intake temps low. I used the two 90s separated with a straight piece to improve high speed flow at high RPM by reducing the sharp 180 I've seen on others.



All told, I'd say it was like $150 CDN, and that includes drill bits, vacuum bungs, vacuum hoses, hose clamps, piping, connectors and everything else I needed.


And, best part: No MIL/CEL, no stalls, no hesitation, and it's quieter at low RPM...
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Old 04-06-2014, 01:44 AM   #1856
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Quote:
Originally Posted by williaty View Post
The third intake style is the traditional Short Ram Intake or Cold Air Intake. This intake style deletes the plastic intake snorkel, the Helmholtz resonator in the fender (snorkus), the stock airbox, possibly the stock MAF section (depending on brand), the accordion pipe, and the so-called torque box. For the purposes of the this discussion, a CAI and SRI are identical, and all brands/models are identical. Something else I'll mention here is that a SRI is crazy bat**** insane loud. Do not put one on if you value the company of a woman. The exact SRI tested is pictured below:

Okay, this may be the dumbest question ever (and I'm ready to get shat on for it), but can't you just use a Short Ram Intake without removing the snorkus in the fender? The SRI doesn't have to go into the fender anyways, doesn't it just suck in air from the engine bay?

Is it because the snorkus sticks out into the engine bay too much, not leaving enough room for the SRI's cone filter?
Or is it because without removing the snorkus, not enough air gets through the fender into the engine bay?

Thanks for the help!
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Old 04-06-2014, 02:54 AM   #1857
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The snorkus has to be "plumbed in" to the rest of the intake. It doesn't work just sitting there. The air going into your engine has to flow through the helmholtz resonator for it to work so it has to be air-tight attached to the rest of the intake.
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Old 04-06-2014, 10:44 AM   #1858
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Thanks for the clarification!
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Old 04-06-2014, 01:02 PM   #1859
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Can I just ask what the two vacuum lines are, which go into the intake piping?

PCV?
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Old 04-06-2014, 01:24 PM   #1860
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Quote:
Originally Posted by Andrew_Geier View Post
Can I just ask what the two vacuum lines are, which go into the intake piping?

PCV?
Valvecover breather lines, which are a part of the PCV system.
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Old 04-06-2014, 04:11 PM   #1861
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Originally Posted by Andrew_Geier View Post
Where did you get all of the blue rubber tubing pieces to connect the intake pieces? I'm thinking of doing a similar set up!

Thanks!
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Old 04-06-2014, 05:07 PM   #1862
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Quote:
Originally Posted by SergeDeC View Post
Where did you get all of the blue rubber tubing pieces to connect the intake pieces? I'm thinking of doing a similar set up!

Thanks!
It's a local performance shop. I am aware now, that I spent a bit too much, but my setup made a pretty massive difference, at least in my opinion, so it may be worth the money and effort. I am, as I said, quite satisfied.


It also gave me a better understanding of my entire engine - I was able to look around the engine bay and see where EVERYTHING was without the intake in place... So, even as just a learning experience, it was quite, quite nice.


Edit: And I also think it looks better, especially with my NGK plug wires.
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Old 04-06-2014, 05:29 PM   #1863
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A friend of mine has a cold air intake that doesn't fit on his car (got it from another guy), so he might be giving me his piping All I really have to buy is the rubber tubing and more metal clamps.

However, I've seen his piping before and I realized there's no holes or little nipples to connect the vacuum hoses too (i think that's what those too rubber hoses are called). How did you set that up? What would I need to do?
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Old 04-06-2014, 06:21 PM   #1864
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I'll be selling a hybrid intake kit I used if anyone is interested
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Old 04-06-2014, 07:37 PM   #1865
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Quote:
Originally Posted by SergeDeC View Post
A friend of mine has a cold air intake that doesn't fit on his car (got it from another guy), so he might be giving me his piping All I really have to buy is the rubber tubing and more metal clamps.

However, I've seen his piping before and I realized there's no holes or little nipples to connect the vacuum hoses too (i think that's what those too rubber hoses are called). How did you set that up? What would I need to do?
I purchased "vacuum bungs" which are essentially connectors with grommets which slide through the hole you drill in the piping.


Step 1: Drill appropriately sized hole (start SMALLER! and then make the hole bigger until you can fit grommet through)
Step 2: Push grommet through.
Step 3: Push connector into grommet
Step 4 (optional): seal the grommet in place
Step 5: Attach vacuum line, which you may or may not have to extend. I extended mine.
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Old 04-14-2014, 10:38 AM   #1866
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Quote:
Originally Posted by Navysesal View Post
I'll be selling a hybrid intake kit I used if anyone is interested
Hey bud... Sent you a pm a few days ago about your hybrid setup... I am interested so get back to me if you still want to sell...
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Old 04-15-2014, 05:27 AM   #1867
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Old 04-19-2014, 09:42 AM   #1868
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Old 04-19-2014, 09:59 AM   #1869
gdoggmoney
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Grommets are going to leak an expand/contract. Get aluminum nipples welded or forever have fuel trims jacked up and jerky herky 2.5 Subaru issues.

In fact put actual hose clamps where the factory did not and replace the 0 tension fake spring clamps.
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Old 04-19-2014, 10:20 PM   #1870
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Quote:
Originally Posted by gdoggmoney View Post
Grommets are going to leak an expand/contract. Get aluminum nipples welded or forever have fuel trims jacked up and jerky herky 2.5 Subaru issues.

In fact put actual hose clamps where the factory did not and replace the 0 tension fake spring clamps.
If I had access to a welder, I would.


However, the spring clamps are gone and the hose clamps are in.
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Old 04-20-2014, 09:53 AM   #1871
gdoggmoney
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I would find access to a welder unless you want to possibly replace valves and or a motor. Lean/rich swings will cause it to pop.
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Old 06-20-2014, 05:00 PM   #1872
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Hey guys, it looks like there is some new technology being developed by Injen that may be able to fix the problem. They call it "MR Technology" (Mega Ram Technology). Check it out.. it seems to address the resonance and turbulent air flow problem.

This is the explanation of the technology:
http://www.injen.com/docs/other/mrtechnology.asp

This is the CAI that they make for the 2005-2007 NA Imprezas, using the MR Technology, Air Fusion, and a web nano-fiber dry filter:
http://www.rallysportdirect.com/Inje...ntake-Polished

What do you guys think?
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Old 06-20-2014, 05:28 PM   #1873
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Hey guys, it looks like there is some new technology being developed by Injen that may be able to fix the problem.
Injen has made this bull**** claim before. They, of course, failed utterly and just produced an intake that had all the old problems but cost a hell of a lot more.

The issue is NOT turbulence and anything designed to fix turbulence isn't going to do **** to fix the real problem. The thing about this who idiocy with both Injen and people here on NASIOC and Subaru owners all over the world is that there is a REALLY SIMPLE way to fix the problem: USE A HELMHOLTZ RESONATOR. You know, like the one the real engineers, not the bro-dudes online, decided to include on the stock intake. There's a good reason why that resonator is there and there's a good reason why it's best to just leave it in place.
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Old 06-30-2014, 10:21 PM   #1874
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Quote:
Originally Posted by williaty View Post
Injen has made this bull**** claim before. They, of course, failed utterly and just produced an intake that had all the old problems but cost a hell of a lot more.

The issue is NOT turbulence and anything designed to fix turbulence isn't going to do **** to fix the real problem. The thing about this who idiocy with both Injen and people here on NASIOC and Subaru owners all over the world is that there is a REALLY SIMPLE way to fix the problem: USE A HELMHOLTZ RESONATOR. You know, like the one the real engineers, not the bro-dudes online, decided to include on the stock intake. There's a good reason why that resonator is there and there's a good reason why it's best to just leave it in place.
But then I don't get that Brotastic intake growl like my buddies Nissan Altima with coilovers and street glo's!
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Old 06-30-2014, 10:27 PM   #1875
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But then I don't get that Brotastic intake growl like my buddies Nissan Altima with coilovers and street glo's!
Oh, right, I forgot the questioner might be trying to be a dumbass on purpose
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