NefMoto > Noob Zone > Noob Questions (Moderator: turboat) > ignition pull at low rpm's after replacing K03 -> K03S
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Author Topic: ignition pull at low rpm's after replacing K03 -> K03S  (Read 4924 times)
CQ1
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« on: March 28, 2017, 11:04:56 PM »
Question for more experienced users.
After replacing turbo K03-> K03-073 passat B5FL-1.8T AWT i get strange timing pull between 1-2k RPM. It's randomly on all cylinders. Sometimes i see even 8 deg cyl retard. Above this rpm range everything is ok.
I'm using VCDS to monitor this. There is no pre load set on WG, but it's boosting much quicker than the old one.
Lowering KFZW in this area does'n help much. Anyone got any idea what could cause this and how to solve it?
« Last Edit: March 28, 2017, 11:46:08 PM by CQ1 » Logged
nyet
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« Reply #1 on: March 28, 2017, 11:23:34 PM »
Log with ME7Logger
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CQ1
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« Reply #2 on: March 28, 2017, 11:40:02 PM »
Quote from: nyet on March 28, 2017, 11:23:34 PM
Log with ME7Logger

Attached. This log was made on standard KFLDIMX from AWT. Small overshot. Filter data need to be disabled to see those timing pulls.
I've been trying with KFLDIMX from AWM engine - it's a bit lower than AWT. There is no overboost, but there is still timming pull at range 1-2k rpm's.
Log with KFLDIMX from AWM (second one) attached.

Those timming pulls mostly hapen on 1-2 gear.
I will try to do one more log from those gears.
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CQ1
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« Reply #3 on: March 29, 2017, 12:14:08 AM »
Quote from: CQ1 on March 28, 2017, 11:40:02 PM
Attached. This log was made on standard KFLDIMX from AWT. Small overshot. Filter data need to be disabled to see those timing pulls.
I've been trying with KFLDIMX from AWM engine - it's a bit lower than AWT. There is no overboost, but there is still timming pull at range 1-2k rpm's.
Log with KFLDIMX from AWM (second one) attached.

Those timming pulls mostly hapen on 1-2 gear.
I will try to do one more log from those gears.
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nyet
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« Reply #4 on: March 29, 2017, 12:25:43 AM »
Odd. Loose or dying knock sensors?

Maybe some other noise causing kr?
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CQ1
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« Reply #5 on: March 29, 2017, 12:44:53 AM »
Quote from: nyet on March 29, 2017, 12:25:43 AM
Odd. Loose or dying knock sensors?

Maybe some other noise causing kr?

Before replacing the turbo there was no knock. This is also not a problem of fuel, because i got same on lpg. There is no preload on WG. It's almost loose. If i will minimaly tighten WG plate, things gets even worse. If the other way, Kr's go down.

The worse i've seen - bellow.
« Last Edit: March 29, 2017, 12:52:34 AM by CQ1 » Logged
sonique
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« Reply #6 on: March 29, 2017, 10:06:34 AM »
Quote from: CQ1 on March 28, 2017, 11:04:56 PM
Question for more experienced users.
After replacing turbo K03-> K03-073 passat B5FL-1.8T AWT i get strange timing pull between 1-2k RPM. It's randomly on all cylinders. Sometimes i see even 8 deg cyl retard. Above this rpm range everything is ok.
I'm using VCDS to monitor this. There is no pre load set on WG, but it's boosting much quicker than the old one.
Lowering KFZW in this area does'n help much. Anyone got any idea what could cause this and how to solve it?


new turbo or used ?
check  oil before throttle remove cooler pipe
to much oil combustion chamber knocking the engine
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CQ1
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« Reply #7 on: March 29, 2017, 11:02:38 PM »
Quote from: sonique on March 29, 2017, 10:06:34 AM
new turbo or used ?
check  oil before throttle remove cooler pipe
to much oil combustion chamber knocking the engine

Old turbo with new CHRA - basically internally new.

Does anyone been adjusting actuator on those turbos? Setting up preload on it is not an option, because every each time i got huge overshot peak. WG plate need to be practically loose.
Seems like quick spool is causing this.
« Last Edit: March 29, 2017, 11:12:28 PM by CQ1 » Logged
CQ1
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« Reply #8 on: March 31, 2017, 01:44:37 AM »
Quote from: nyet on March 29, 2017, 12:25:43 AM
Odd. Loose or dying knock sensors?

Maybe some other noise causing kr?

Nyet, You may be right. I have checked log i made some time ago and there was same situation. I just didn't noticed that.
Will search bit better then.
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KasperH
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« Reply #9 on: March 31, 2017, 02:11:55 AM »
Re-torque knock sensors and log a run and see if knock is gone or diminished Smiley
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