Adjust calculation of ps_w and msdk

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Topic: Adjust calculation of ps_w and msdk_w (Read 550 times)

M.Mischler

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	Adjust calculation of ps_w and msdk_w « on: November 29, 2024, 09:46:23 AM »

Setup:

OEM Parts
------------
2.7t AGB
FPR S4 B5 (4 Bar)
MAF S4 B5
Throttle body S4 B5

Tuning Parts
--------------
Bigger charge-air cooler
630cc EV14 Bosch injectors
Bigger turbocharger
Bigger exhaust manifold
Intake manifold RS4 B5

I have the following two issues:

- IntakeManifoldAbsolutePressure (ps_w) is higher than ActualBoostPresure (pvdkdsl_w)
- MassAirFlowAtThrottlePlate (msdk_w) is higher than actual MassAirFlow (mshfm_w)

The forum entry http://nefariousmotorsports.com/forum/index.php?topic=14012.msg113563#msg113563 discusses my problems.

According to nubcake I have to adjust all *WDK* maps first:

Quote from: nubcake on March 16, 2018, 04:21:15 AM

Basically:
1) ... set WDK maps close enough.

Does this mean that I should adjust the KFWDKMSN and WDKUGDN maps? And what does "close enough" mean?


« Last Edit: November 29, 2024, 09:49:07 AM by M.Mischler »	Logged

prj

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	Re: Adjust calculation of ps_w and msdk_w « Reply #1 on: November 29, 2024, 10:56:30 AM »

Your throttle body is stock so KFWDKMSN and KFMSNWDK do not need to be modified.
For msdk_w there is only WDKUGDN.

About ps_w everything is written in that post.


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M.Mischler

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	Re: Adjust calculation of ps_w and msdk_w « Reply #2 on: November 30, 2024, 09:29:09 AM »

Quote from: prj on November 29, 2024, 10:56:30 AM

Your throttle body is stock so KFWDKMSN and KFMSNWDK do not need to be modified.
For msdk_w there is only WDKUGDN.

About ps_w everything is written in that post.

Hi prj

Thank you for answering me so quickly. I will read the relevant part of the FR again, try to make the necessary changes and get back to you here if I come across any problems of understanding.


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M.Mischler

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	Re: Adjust calculation of ps_w and msdk_w « Reply #3 on: Yesterday at 08:25:29 AM »

Quote from: prj on November 29, 2024, 10:56:30 AM

About ps_w everything is written in that post.

Quote from: nubcake on March 17, 2018, 01:01:04 PM

URL/PRG to adjust VE.

My current understanding is that changes in KFURL have a greater impact on ps_w than changes in KFPRG. But both have an impact on ps_w.

I would like to know if I should only make adjustments to KFURL? Or if I should only adjust KFPRG first. Which is better in your experience?


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prj

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	Re: Adjust calculation of ps_w and msdk_w « Reply #4 on: Yesterday at 04:47:16 PM »

What you wrote makes absolutely zero sense.
KFURL * KFPBRK + KFPRG is the formula. It's basic school math.


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M.Mischler

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	Re: Adjust calculation of ps_w and msdk_w « Reply #5 on: Today at 03:27:47 AM »

Hi prj

Quote from: prj on Yesterday at 04:47:16 PM

What you wrote makes absolutely zero sense.
KFURL * KFPBRK + KFPRG is the formula.

Thank you for your feedback.

I'll ask my question differently: what criteria do you use to decide whether to adjust the values of KFURL or KFPRG so that ps_w reaches the desired value?


« Last Edit: Today* at 03:56:07 AM by M.Mischler* »	Logged

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