NefMoto > Technical > Tuning > Tuning KFMSNWDK/KFWDKMSN/WDKUGDN best practices?
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Author Topic: Tuning KFMSNWDK/KFWDKMSN/WDKUGDN best practices?  (Read 5435 times)
amd is the best
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« on: July 30, 2019, 09:00:15 AM »
Hello all.

I am looking for some direction or guidance with regards to FUEDK. Is there an organized or strategic approach for tuning these maps properly? Is there a way to calculate the best values to populate these cells based on HFM measurements?

I can keep doing log after log while matching MSHFM to MSDK and adjusting numbers until the match closely at 100% DK. Then maybe limit DK with KFWDKSMX, measure, compare, tweak, etc.

Also, how does the axis data on WDKMSN get derived from MSNWDK? Is it the highest value in the corresponding throttle position, the average?

I've read this module several times and I must be missing something.

Long story short, I keep getting P1143 - Load Calculation Cross Check Upper Limit reached even though at 100% DK, HFM and MSDK are VERY close.

Any input would be incredible.

Thank you all in advance.
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prj
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« Reply #1 on: July 30, 2019, 10:17:43 AM »
There is pretty much nothing to be "tuned" there.
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nyet
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« Reply #2 on: July 30, 2019, 10:20:35 AM »
Quote from: amd is the best on July 30, 2019, 09:00:15 AM
Long story short, I keep getting P1143 - Load Calculation Cross Check Upper Limit reached even though at 100% DK, HFM and MSDK are VERY close.

what DFPM is 17551/P1143? have you traced it in the FR?
« Last Edit: July 30, 2019, 10:25:11 AM by nyet » Logged
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amd is the best
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« Reply #3 on: July 30, 2019, 02:49:25 PM »
Quote from: prj on July 30, 2019, 10:17:43 AM
There is pretty much nothing to be "tuned" there.


Should I revert those table back to stock and make adjustments in some other way? In theory, the throttle unit should flow the same no matter if air is being forced or sucked through it. So I can see where maybe these don't need to be touched since the throttle body is stock. Is it all going to be adjusted through WDKUGDN? How else might I go about getting HFM and MSDK to line up?

 I know you told me that tuning a supercharger wasn't going to be easy and you weren't wrong. The car is running pretty well otherwise, just trying to wrap my head around this fault the is coming up on occasion.

Quote from: nyet on July 30, 2019, 10:20:35 AM
what DFPM is 17551/P1143? have you traced it in the FR?

I have not. Not familiar with DFPM... I know this code is related to DEGFE though.
« Last Edit: July 30, 2019, 02:51:59 PM by amd is the best » Logged
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« Reply #4 on: July 30, 2019, 09:15:33 PM »
Why not find the root cause instead of guessing?

Looks like you only need to trace:

B_fkmsmx
B_fkpvmx
B_stend

CWDEGFE will disable it entirely (so you know if DEGFE is really the source of the DTC)


fkmsdksg_w > FKMSDKMX sets B_fkmsmx
fkpvdkg_w > FKPVDKMX sets B_fpkvmx
« Last Edit: July 30, 2019, 09:54:26 PM by nyet » Logged
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Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
amd is the best
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« Reply #5 on: July 31, 2019, 07:17:11 PM »
Quote from: nyet on July 30, 2019, 09:15:33 PM
Why not find the root cause instead of guessing?

Looks like you only need to trace:

B_fkmsmx
B_fkpvmx
B_stend

CWDEGFE will disable it entirely (so you know if DEGFE is really the source of the DTC)


fkmsdksg_w > FKMSDKMX sets B_fkmsmx
fkpvdkg_w > FKPVDKMX sets B_fpkvmx


CWDEGFE in my binary is already set to 0... Maybe this is indicating that the issue isn't being created by DEGFE.

B_fkmsmx and B_fkpvmx are set right from the get go. The fault doesn't occur until the engine is in boost it seems.
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amd is the best
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« Reply #6 on: July 31, 2019, 07:18:41 PM »
Here's a log, in case anyone cares to take a look.
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prj
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« Reply #7 on: August 01, 2019, 12:41:12 AM »
KFMSNWDK and KFWDKMSN describe the physical flow of the throttle body.
If the throttle is stock you should NEVER EVER touch these maps. It does not matter if the throttle is attached to an engine or a flow bench or whatever else, these maps will ALWAYS be the same, because they describe the physically maximum possible flow through the throttle at a given throttle opening.
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amd is the best
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« Reply #8 on: August 01, 2019, 01:04:32 PM »
Thank you for clearing that up. And that's what I had suspected.
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STEVEPHILP
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« Reply #9 on: August 02, 2019, 05:44:50 AM »
And tuning a TB without flow data is a massive pita... Not worth the time IMO.
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