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Author Topic: 1.8T TTE420 strange knock CFs  (Read 51212 times)
carsey
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« on: January 17, 2016, 01:34:52 PM »

Hi

Finally got my hybrid turbo on my 1.8T and running today...so took it out to get the boost maps setup to a safe level.   Using open loop method.

Got the car running nicely at 22-23psi on the gauge with -5.25CF with no methanol added.  So was happy with that result....turned the meth on and this dropped to -3CF as expected.

However, after a couple of runs, the timing CFs jumped to -8.25CF with no map changes, which I found odd considering no changes.

Couple of logs to show this.

Anyone any ideas?
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vwaudiguy
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« Reply #1 on: January 17, 2016, 03:02:01 PM »

IMHO you should be tuning for 0 CF under average conditions. Also be aware everytime you clear faults/flash a new file the knock trims get reset. Just making sure you're comparing apples to apples and not with corrections already applied. Didn't look at logs because smartphone.
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carsey
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« Reply #2 on: January 22, 2016, 02:24:02 PM »

anyone?
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ddillenger
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« Reply #3 on: January 22, 2016, 02:27:04 PM »

Are you misfiring? It looks like you are.
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carsey
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« Reply #4 on: January 22, 2016, 02:58:05 PM »

Nope,  no misfiring on them logs.


Did notice a little slight miss once or twice accelerating in 5th at heavy load.  but was once in a blue moon.
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ddillenger
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« Reply #5 on: January 22, 2016, 03:15:04 PM »

I am going to stand by my initial assessment.

I think you are misfiring.
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Lost
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« Reply #6 on: January 22, 2016, 03:17:47 PM »

How is your real AFR and why are you requesting so much load?
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carsey
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« Reply #7 on: January 22, 2016, 03:32:34 PM »

Open loop.  So the ldrxn is up and out of the way,  and let the boost duty/map control it.

Definitely no misfiring on them logs.  if there is...its so minute I cant even feel it.
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ddillenger
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« Reply #8 on: January 22, 2016, 04:01:38 PM »


Definitely no misfiring on them logs.  if there is...its so minute I cant even feel it.

Did you look at the RPM and timestamp?
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fknbrkn
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mk4 1.8T AUM


« Reply #9 on: January 22, 2016, 04:25:22 PM »

is it ok 27 deg camshaft angle?
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SB_GLI
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« Reply #10 on: January 22, 2016, 07:17:55 PM »

rpm + camshaft angle over time.  VVT until 6k?

Looks like a bad ass setup.  details?
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mister t
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« Reply #11 on: January 23, 2016, 01:28:35 AM »

. Also be aware everytime you clear faults/flash a new file the knock trims get reset.

True that they get cleared when you reflash, but clearing the faults won't reset the dynamic knock control.

However, disconnecting the battery for 10 sec or so will do so.

Just make sure to always log dynamic knock control as a matter of cause. That way you have that information if you need to reference it.
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carsey
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« Reply #12 on: January 23, 2016, 04:14:12 AM »

Odd,  I can see the very slight drop in rpm's at certain points, but only about 40rpms.....however, putting the timestamp in the log in ECU plot aswell doesnt equal a straight line which you would expect if it logs the time properly.... some places the time goes back!  (see the picture)

VVT map is set to switch over at 5900rpm,  its the way its tuned and gives gains in the setup,  granted that switchover point was for my old K04-064 the theory is still the same and works on all 1.8T.
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carsey
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« Reply #13 on: January 23, 2016, 08:14:13 AM »

Newest log.
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ddillenger
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« Reply #14 on: January 23, 2016, 09:59:35 AM »

27 degrees is not normal you know. It's a binary tensioner. On or off, 0 or 22. A degree or so deviation is to be expected. 5 on the verge of failure.
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