Lambda Correction and unstable idle

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@lq!

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	Lambda Correction and unstable idle « on: July 03, 2016, 11:10:46 PM »

Hi Team,

I'm working on 06A906032HN_ME7.5 ECU. And i a have strange issue.

When i start the engine everything looks perfect but when lambda correction activated A/F ratio going to unstable state. Please find the attachment for logging.

Does anyone have any idea? What may cause that ?

Thank you

Regards,

Here is a config.

Bosch 550cc injector,3bar fpr,S3 MAF housing.
TVUB : 2.7 1.54 1.12 0.73 0.523
KRKTE: 0.070
TEMIN: 0.6ms


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aef

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	Re: Lambda Correction and unstable idle « Reply #1 on: July 03, 2016, 11:47:31 PM »

Would try to change the tvub according to this:
http://nefariousmotorsports.com/forum/index.php?topic=6670.msg67239#msg67239

Your KRKTE looks wrong too

KRKTE * FLOW = CHEATNUMBER
0,10301 * 317cc = 32,65417

CHEATNUMBER / new FLOW = new KRKTE
32,65417 / 550cc = 0,05937


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@lq!

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	Re: Lambda Correction and unstable idle « Reply #2 on: July 04, 2016, 12:26:00 AM »

Quote from: aef on July 03, 2016, 11:47:31 PM

Hello Mate

I'm using just s3 maf housing without S3 sensor, engine runing with own sensor.

also i changed krkte 0.60 there is no any change. Just ,half throttle going to a bit lean.


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nubcake

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	Re: Lambda Correction and unstable idle « Reply #3 on: July 04, 2016, 03:37:40 AM »

Quote from: @lq! on July 04, 2016, 12:26:00 AM

Hello Mate

I'm using just s3 maf housing without S3 sensor, engine runing with own sensor.

Are S3 and stock MAF housings of different diameter? If yes, did you rescale your MLHFM?
If it's larger and you didn't rescale the MAF - you should do that.


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@lq!

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	Re: Lambda Correction and unstable idle « Reply #4 on: July 04, 2016, 05:22:48 AM »

Quote from: nubcake on July 04, 2016, 03:37:40 AM

Are S3 and stock MAF housings of different diameter? If yes, did you rescale your MLHFM?
If it's larger and you didn't rescale the MAF - you should do that.

Hello

i didn't touch MLHFM map. because i didn't change the sensor. but i tried rescale MLHFM result is same..


« Last Edit: July 04, 2016, 05:31:54 AM by @lq! »	Logged

nubcake

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	Re: Lambda Correction and unstable idle « Reply #5 on: July 04, 2016, 06:19:14 AM »

Quote from: @lq! on July 04, 2016, 05:22:48 AM

i didn't change the sensor

You changed the housing though, which means that it's calibration is no longer valid (IF the diameter is different ofc).
It's in the wiki: http://s4wiki.com/wiki/Mass_air_flow#MAF_housing_diameter


« Last Edit: July 04, 2016, 06:20:47 AM by nubcake »	Logged

@lq!

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	Re: Lambda Correction and unstable idle « Reply #6 on: July 15, 2016, 08:48:13 AM »

Hi Mate

I changed housing with stock one, and change all maf maps to stock. But result is same. Does any mechanical problem cause this symptom ?


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