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Old 09-26-2013, 10:07 PM   #26
Chicago AJ
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I went out on my lunch break and drove around our parking garage. No clinks or noises at all.
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Old 09-26-2013, 10:49 PM   #27
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No idea, it doesn't sound horribly bad, its really quite odd.

Last edited by AWDORBUST13; 09-27-2013 at 07:53 AM. Reason: Spelling
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Old 09-27-2013, 07:55 AM   #28
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Bringing it in for a smoke test on the intake tract if they can get it in today, got a video on my phone of the noise that I will put up later and a couple data logs. Hopefully it's all just paranoia, but better safe than sorry.

Side 2 part question-The ethanol free gas we have available here is 91, might it be better to use that fuel and run a 91oct map than the 93 octane I have been using? Also the 93 octane is "tri-clean to help cut down on emissions" from citgo, might that be the reason my A/f learning numbers are screwy?
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Old 09-27-2013, 11:16 AM   #29
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metallic "clinking" sound reminiscent of pinging - are you logging knock events when you hear this?
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Old 09-27-2013, 11:30 AM   #30
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Yeah, they don't log every time I hear it, but I am logging knocks of -1.4 at least once every time I drive my car. One occurred as I heard the sound. Also pinging sounds like a good a word as any to describe what it sounds like.
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Old 09-27-2013, 01:05 PM   #31
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And this is when you just let of the gas during low load driving?
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Old 09-27-2013, 01:29 PM   #32
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Yeah, I can consistently have it make the noise in 3rd gear at about 2000 rpm by giving it maybe 25% throttle and letting off the gas. May get to about 2300 rpm max.
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Old 09-27-2013, 02:41 PM   #33
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Quote:
Originally Posted by AWDORBUST13 View Post
Yeah, I can consistently have it make the noise in 3rd gear at about 2000 rpm by giving it maybe 25% throttle and letting off the gas. May get to about 2300 rpm max.
I think I had a similar noise after adding my AEM cai. It would come on at low rpm when letting off the throttle. Sounded like a "ping" metal sound, like 2 small wrenches lightly being tapped together. It wasn't detonation or knocking my logs were pretty much knock free. I had a smoke test done and no leaks.

It only happened at low rpm when letting off the gas, easily duplicated.

Anyway swapped out my oem BPV to a Forge and the sound was gone. In my case it was something internal with the oem BPV.

Last edited by limitwrx; 09-27-2013 at 04:10 PM.
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Old 09-27-2013, 02:48 PM   #34
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That sounds alot like what I am experiencing, do you have a link to the one you bought that I can take a peak at?

I have an appointment on Tuesday to meet with the master technician at my local Subaru dealership to bring him for a ride and do a smoke test.

Did you have some odd looking A/F learning logs? Which fuel do you buy?
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Old 09-27-2013, 03:15 PM   #35
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I knew it could've been the bpv! I get a small wind gust noise at those rpms/speed with my stock airbox/bpv. Putting in my Cobb SF tomorrow and I'm sure I'll have a whole new gauntlet of noises to get used to, lol.

Here's a link to the Forge BPV for our cars.

http://shop.bostonmotorsports.com/Fo...LGT_p_572.html
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Old 09-27-2013, 03:57 PM   #36
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Quote:
Originally Posted by AWDORBUST13 View Post
That sounds alot like what I am experiencing, do you have a link to the one you bought that I can take a peak at?

I have an appointment on Tuesday to meet with the master technician at my local Subaru dealership to bring him for a ride and do a smoke test.

Did you have some odd looking A/F learning logs? Which fuel do you buy?
I bought the Forge version 2 since it uses the OEM diamond gasket. I think the one AJ linked to is correct.

I use Chevron for gas.

My A/F learning was fine, but I was running a Torqued Performance map, Eric from TP dialed everything in for me.

I am Protuned now so everything is really dialed in.
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Old 09-27-2013, 04:07 PM   #37
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Thanks guys, I don't have a chevron near me, but trying to look in to if I should go with the local gas place that has 91 ethanol free or go stick with the 93. Have you guys read anything about something like that?
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Old 09-27-2013, 05:48 PM   #38
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I'd buy ethanol-free gas every time if I could. Unfortunately here in California we have crappy gas and it always has ethanol in it
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Old 09-27-2013, 06:50 PM   #39
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Even though its 91 and not 93? Can I ask the specifics of why? I know they put detergents etc in the ethanol gas but as performance goes whats the difference?
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Old 09-27-2013, 07:02 PM   #40
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You'll have to run a 91 octane map then and sacrifice a bit of power. I'd stick with the 93. But if you could find no ethanol 93, that'd be amazing. Lol
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Old 09-27-2013, 07:08 PM   #41
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The ethanol contents vary pretty wildly - they're supposed to be 10% ethanol blends but they really range from 5-15% depending on the day of the week, direction of the wind, etc.
In terms of energy density, gasoline is rated at ~46.4 megajoules per kilogram, whereas pure ethanol is 30 megajoules per kilogram. The net effect is that it takes around 40% more ethanol by volume to equal the amount of energy of gasoline. So realistically what that means is that the 93 octane 90/10 blend has 4% less specific energy than the 91 octane 100% gasoline blend. It's not quite as resistant to knock, but we can tune for that

As far as detergents/additives go they put those in all gasoline.
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Old 10-01-2013, 04:09 PM   #42
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Went to the dealership today for my smoke test and for the tech to check out my sound I was hearing. He pretty much told me he didn't think the sound was anything to worry about, and that they couldn't do a smoke test.

I was rather mad as the person who I scheduled with said they could, but I guess what he meant was that they could simply run the numbers and send the to Subaru to see what was wrong.

So now I have scheduled a smoke test with another auto place in town that will simply do the smoke test I have been seeking since last Tuesday!

Meanwhile I am going to post up a few of the logs I have run over the past few weeks.

One

Two

Three

Four

five

Six

These were taken on different days with temperatures varying from ~ 45-60 degrees.

Last edited by AWDORBUST13; 10-01-2013 at 04:16 PM.
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Old 10-02-2013, 08:10 PM   #43
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2013 WRX Stage 1 93 + AEM MTv311

Well tomorrow I SHOULD get my intake tract tested, but as everything has been going down who knows

Figured I would throw some info and two logs I took today for the hell of it. Also will put the fact out there that this week I have been running on Sunoco gas from a busy area rather than Citgo gas I get from down the street.

A/F learning looks like its changing, I was cruising no throttle at -.78 then slowly it went to +.78 then tonight it was cruising at +1.56. I will note that I have been not hesitating to take the car to boost for the past couple days as I had been the last couple of weeks which most likely will change Learning ETC.

Here are the A/F Learning Numbers after driving 1 Hour 20 Mins from work this afternoon.

1:-3.12 (-5.47/0.78)
A:-3.40 (-3.40/-3.40)
B:1.00 (1.00/1.00)
C: -5.20 (-5.20/-5.20)

Here are the A/F Learning Numbers after a trip in to town in stop and go traffic tonight.

1:-5.47 (-5.47/1.56)
A: -5.80(-5.80/-5.80)
B:1.30 (1.30/1.30)
C: -5.30 (-5.30/-5.30)

@50 Degrees F Moist Foggy Morning
Log from this A.M.

@71 Degrees F Dry Clear Evening (wife was with me had to cut it short to avoid the wrath)
Log from this P.M.

I know the A/F learning values are learned over periods of time and you generally monitor them over the course of 1+ tanks of gas. I simply am including this data just to be as thorough as possible with this entire post so I have it for my own records.

I see mostly slight knocks here and there within the -1.4 area with the most extreme case being a -5.6 that I saw while accelerating up a larger hill earlier today.

Some Fine Knock Learning periodically happens during acceleration in second gear as well. Other than all of this I am not noticing any loss of power and the car is not throwing any check engine light.

Perhaps this is a case where I got some bad gas from a station and need to chalk it up to learning or I will find out tomorrow that I have an intake tract leak.

Last edited by AWDORBUST13; 10-02-2013 at 08:12 PM. Reason: Spelling
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Old 10-02-2013, 09:40 PM   #44
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Has anyone suggested putting the stock intake back on and checking the A/F trims? Cheaper than a smoke test, and if everything goes back to normal, your car obviously doesn't like the AEM intake/tune. I got the Cobb SF and airbox and put it in last Saturday and my A/F trims are almost all the same as before intake... You should ditch the AEM and try Cobb if you truly have no leak(s). Either way, I hope you get this figured out.

Also, in regards to knock, if you see events at low loads, I've read that is somewhat normal for all cars stock to protuned. As long as the wot is knock free you're good. Obviously there can still be random events at wot, but as long as they're not consistent you should be ok.

Last edited by Chicago AJ; 10-03-2013 at 02:17 AM.
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Old 10-03-2013, 07:03 AM   #45
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No one has suggested this, but I don't believe I can return the intake due to rallysportdirect having a no return unless unused/unopened policy. I don't really want to soak a $255 hit on my intake and buy another for around $300.

If my car comes back with no leaks I most likely will do as you said and check the numbers. If that turns out to be the case I'll look into selling the intake on here for a bit cheaper than I paid and pick up the Cobb with air box.

Last edited by AWDORBUST13; 10-03-2013 at 07:29 AM. Reason: Adding content.
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Old 10-03-2013, 11:47 AM   #46
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Just got a call back from the automotive shop that confirmed that no leaks were found during the smoke test this morning. My question is this:

How do I treat the car now and is there anything more I can do? What else to look for? I know the values are borderline and I only see small knocks occasionally and sometimes in my wot logs so I'm kind of up in the air at this point.

Most recent logs and info is in the post 3 up from this one from last night.
Any suggestions from cobb/other owners?

Thanks-
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Old 10-03-2013, 02:08 PM   #47
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Didn't Chris say they weren't terrible and you could just drive like that?
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Old 10-03-2013, 05:33 PM   #48
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I remember him saying that and re read his post . I planned to keep an eye on it as mentioned, my question was just in reference to any other common problems I could check for or monitor on my v3.

I'm not overly concerned as the smoke test came back negative, but I like to know as much about what problems could arise and how to spot them.

Also was looking for input on the logs I posted to see if they had anything they noticed I didn't.
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Old 10-07-2013, 02:27 PM   #49
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Here are a couple more logs I pulled this morning.

A/F Learning seems to be going from anywhere in the -4 to -7 range in 1,A,C and .60 to 1.30 in B.

Still getting the Fine Knock Learning on every WOT pull, usually being in the -1.4 to -1.75 area. With the feedback knocks happening on only some of them.

Here is a log and a half (had to cut it short for safety). Taken at 65 degrees F

One

Half

Everything else has looked pretty well so far, some overboost around 18.10 psi in lower temperatures so I may go with the LWG map as winter approaches.
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Old 10-07-2013, 05:41 PM   #50
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Switch to the 91 octane + AEM to hopefully lose the knocking completely if you keep running 93 octane. I just did this and my car feels so smooth, haven't seen any knock yet either, not even at low loads. You only lose about 1psi so power loss isn't noticeable and you give your car a 2 octane buffer. My A/F trims are almost all exactly 0 as well.

This map will also help combat overboost in winter as well. I'm going to run this map full time.
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