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Old 10-03-2012, 04:23 PM   #1
scoobySTi06
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Default 06 STi: Knocking??

I recently data logged a couple runs because i was getting a weird sound when driving around 3000-3500 rpm in all gears. Fluttery/knock sound possibly. This is all around -10 boost. Just for curiousity sake i also logged 2 runs in 3rd gear and one in 4th gear along with 3 in 5th when the car was making the mysterious sound. This sound is also happening in neutral when revving. I'm positive it's a knock.

Mods:
HKS BOV
Tomei UEL Headers/Up-pipe (possibly Tomei)
Greddy Ti-C TBE
ARC Airbox
Airboy Protune via AP

Data Logs:
Trying to recreate Mysterious Sound
https://docs.google.com/open?id=0BwN...UdfdEx0V1NWTkU
https://docs.google.com/open?id=0BwN...GMtS2FJTUxsS2c
https://docs.google.com/open?id=0BwN...HNRVXNXOUxsaTg

3rd Gear Log
https://docs.google.com/open?id=0BwN...GtKa2NhWGRpZDQ
https://docs.google.com/open?id=0BwN...WFJVkxDcHlJY2s

4th Gear Log
https://docs.google.com/open?id=0BwN...TBUZlNpSTBwYlk

Hopefully someone can help!!
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Old 10-03-2012, 06:57 PM   #2
scoobySTi06
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Help Please!!!
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Old 10-03-2012, 07:01 PM   #3
Black94Snake
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next time you load logs to google docs, make sure you let google convert them. we really dont want to have to download them.

I just reviewed all of your files, and the only log you have that shows an active knock is your 4th gear log.

Take the car out and do a proper WOT log of your car. That means, and I dont want to hear any complaining about it, you need to go find a place where you can put the car in 4th (STi) at about 2300rpm and go WOT... Not a gentle roll of the throttle. just stab it to the floor and run up to about 6500rpm in that gear.

come back and post with that log, then we can help you (since the log will have more useful data in it).

Last edited by Black94Snake; 10-03-2012 at 07:08 PM.
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Old 10-03-2012, 07:29 PM   #4
scoobySTi06
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Quote:
Originally Posted by Black94Snake
next time you load logs to google docs, make sure you let google convert them. we really dont want to have to download them.

I just reviewed all of your files, and the only log you have that shows an active knock is your 4th gear log.

Take the car out and do a proper WOT log of your car. That means, and I dont want to hear any complaining about it, you need to go find a place where you can put the car in 4th (STi) at about 2300rpm and go WOT... Not a gentle roll of the throttle. just stab it to the floor and run up to about 6500rpm in that gear.

come back and post with that log, then we can help you (since the log will have more useful data in it).
Alright sounds good i'll do that tonight and re-post asap. Thank you got the heads up
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Old 10-08-2012, 10:34 PM   #5
scoobySTi06
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Default 06 STi: Knocking?? (New Data Logs)

Here are the data logs from 2300-6600rpm @ WOT. Both of the logs are done in 4th gear. Let me know what you think. Thanks to everyone in advance who can help with the problem.

Data Logs:
https://docs.google.com/open?id=0BwN...lBfNVVYSlY0ekk
https://docs.google.com/open?id=0BwN...lREcVRBNUJSeUk

I'm sorry for not being able to convert the files so no one has to download them. I'm new to google docs.
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Old 10-08-2012, 10:48 PM   #6
Airboy
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Have you looked for the source of the rattling sounds coming from the engine when you rev it in neutral? Drain your oil and look for metal flakes?
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Old 10-08-2012, 10:58 PM   #7
scoobySTi06
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Quote:
Originally Posted by Airboy View Post
Have you looked for the source of the rattling sounds coming from the engine when you rev it in neutral? Drain your oil and look for metal flakes?
I haven't had time yet. Do you notice anything out of the ordinary in the log? Tomorrow night i was planning on draining the oil and checking.
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Old 10-08-2012, 11:11 PM   #8
Airboy
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The knock sensor is picking up a lot of noise. Not surprising given that you can hear it rattling in neutral. Look for the source of the rattle, check the oil, and don't do any more full throttle runs. You don't want to put a rod through the block.
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Old 10-08-2012, 11:22 PM   #9
scoobySTi06
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Quote:
Originally Posted by Airboy View Post
The knock sensor is picking up a lot of noise. Not surprising given that you can hear it rattling in neutral. Look for the source of the rattle, check the oil, and don't do any more full throttle runs. You don't want to put a rod through the block.
I just took a quick look around the car. I am leaking oil from what looks like the valve cover (furthest side of the engine if one were to go horizontally from the center of the engine) on the drivers side (same side as where the "knock/rattle" is coming from).
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Old 10-09-2012, 03:22 AM   #10
mikeydrives1
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STi II type M

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The DAM is reading 1.0, which is a good thing.

If it were bad knocking, that DAM would start getting reduced, as the ECU starts to pull timing in an attempt to correct the knocking.

However, you are registering slight knock feeback and fine knock.
need more logs.
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Old 10-09-2012, 03:38 PM   #11
scoobySTi06
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Quote:
Originally Posted by mikeydrives1
The DAM is reading 1.0, which is a good thing.

If it were bad knocking, that DAM would start getting reduced, as the ECU starts to pull timing in an attempt to correct the knocking.

However, you are registering slight knock feeback and fine knock.
need more logs.
What else do you need in terms of logs?
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Old 10-09-2012, 07:51 PM   #12
mikeydrives1
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STi II type M

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Well the cobb AP preset log values are very informative with showing where knock is and what timing is or isnt being pulled.

Do you have a wideband AF sensor in there? Logs of that along with what is going on with the pull will help give us another crucial look into what may be going on. Remember... If the AFR is leaning out, that can cause knock. This is a tuning issue and could be resolved by having it adjusted to add more fuel at those designated ranges where the knock is occuring.


Also, check the TMIC for oil buildup. A little blowby residual oil is OK, all turbo cars get blowby .... however, if there are heaping puddles of oil in the top mount, this may be an issue... oil getting sucked in with the air (in larger quantities) and mixxed in the combustion chamber will cause knock because it has different combustion properties than gasoline (even though they both derive from the same product... crude oil). This is often solved by getting a Catch can / air-oil seperator installed.
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