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still knocking after e-tune
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Old 06-21-10, 11:01 AM   #1
erikm
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Default still knocking after e-tune

08 STi after being stage 1 e-tuned. Tuner says FBKC is probably noise, not real knock.

This is part of a log taken while I was cruising on the highway. I am seeing this sort of FBKC in 5th and 6th gear almost every time I hit an uphill and give it some gas/go into boost.

What do you guys think? Noise or knock?

NSFW, I know you've already commented.. but your opinion/discussion is still very welcome!

Log 1

Log 2

Last edited by erikm; 06-21-10 at 02:33 PM.
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Old 06-22-10, 10:02 AM   #2
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Default Re: still knocking after e-tune

No one has any comments/suggestions?
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Old 06-22-10, 01:21 PM   #3
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Default Re: still knocking after e-tune

What parts r u running. Is anything hitting the driveline?
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Old 06-22-10, 02:27 PM   #4
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Default Re: still knocking after e-tune

Only a Harman Motive CBE. I have gone over the car multiple times looking for anything that may be rattling or hitting the driveline. There is nothing.
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Old 06-23-10, 05:22 AM   #5
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Default Re: still knocking after e-tune

How many miles are on it/ does it knock all the time? Some of those 08 were crated and marked engine replacement from the factory..did u do a protune?
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Old 06-23-10, 07:29 AM   #6
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Default Re: still knocking after e-tune

Didn't you have these same problems awhile back and people were telling you to use thicker oil to mask the knock altogether even though you were burning alot of oil?

I remember stating that you should get another tune and if the problem persists, it is most likely a mechanical problem related to engine internals.

You were also burning quite a bit of oil, was this resolved? I remember some people telling you to go thicker oil to "solve" this.

Think about it this way. If you have a differential seal leak and getting differential noise would you just up the weight from a 75w90 to a 140 weight? Yeah that would either stop the leak or leak alot slower while muffling the noise but you did not solve the problem in anyway.

I unsubscribed because of all the drama queens.

I suggest that you just trust your tuner at this point and get that oil consumption problem actually fixed if it is still happening.

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Old 06-23-10, 08:24 AM   #7
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Default Re: still knocking after e-tune

Oil consumption has been fixed. Had Mobil 1 in there from the dealer and it came out like water after 4,500 km. I am running Amsoil 0w30 now and after 5,000 km I have consumed less than 1 quart. I have topped it up twice with around a 1/4 quart each time.

I now have 80,000 kms on the engine so from what I read this oil consumption is well within spec now.

I am changing the oil in the next week and I will be sending it away for an oil analysis.

I'm still suspicious of a mechanical problem but compression/leakdown are well within spec as well.

Got a revised map from my tuner this morning and it seems to have removed all city driving knocking. Haven't had a chance to get onto the highway yet though.
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Old 06-23-10, 09:04 AM   #8
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Default Re: still knocking after e-tune

Quote:
Originally Posted by erikm View Post
Oil consumption has been fixed. Had Mobil 1 in there from the dealer and it came out like water after 4,500 km. I am running Amsoil 0w30 now and after 5,000 km I have consumed less than 1 quart. I have topped it up twice with around a 1/4 quart each time.

I now have 80,000 kms on the engine so from what I read this oil consumption is well within spec now.

I am changing the oil in the next week and I will be sending it away for an oil analysis.

I'm still suspicious of a mechanical problem but compression/leakdown are well within spec as well.

Got a revised map from my tuner this morning and it seems to have removed all city driving knocking. Haven't had a chance to get onto the highway yet though.
Just letting you know that of the 08+ STis I've worked on with a clean bill of health don't burn anything close to that at 3500 miles and temps here get to above 100 F. But yeah, whatever floats your boat. Hope the oil analysis comes back good. If it does then you are golden.
Just let your tuner handle it. If anything, you are still under warranty if all you did is stage 1 and purchased the 100k extended (just make sure you flash back to stock) If not, then I hope everything goes a ok for you.
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Old 06-23-10, 09:16 AM   #9
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Default Re: still knocking after e-tune

I wouldn't say that consuming close to a quart of oil floats my boat.. it's still not right.

That being said, how many miles are on the 08 STi's that you've worked on? My car ran 68,000 km with the stock tune

In the back of my mind I am SURE I have a cracked piston.. but I can't prove it. I have no smoking from oil filler/exhaust, literally zero oil in intercooler, piping and intake and the car pulls hard.

I do have an extended warranty until 110,000km
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Old 06-23-10, 09:25 AM   #10
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Default Re: still knocking after e-tune

Compression test?
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