NefMoto > Technical > Tuning > MAF pegged at 327.5
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Author Topic: MAF pegged at 327.5  (Read 8865 times)
Rick
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« on: March 05, 2011, 06:59:15 AM »
Below is a log from  VCDS.  My MAF is pegging at 327.5  Does this look right?   Wiki suggests 335.  You can also see that my load, and hence boost, is oscillating slightly.  Now this could well be a PID issue, but it could also be something that is capping the max load at 191, and the airflow at 327.  Overboost and Pressure ratio maps are now FF'd out.  Map for diagnosing max airflow limit has been adjusted to 400g/s.  Thoughts?


TIME         RPM          PW            MAF
650.82   4000   185   11.22   214.97
651.22   4240   182   10.88   225.5
651.64   4560   181.2   10.88   242.58
652.07   4840   185.7   11.22   265.08
652.5   5120   185   11.22   290.06
652.97   5440   191.7   11.56   325.94
653.43   5760   185.7   11.22   320.97
653.91   6040   182   10.88   327.5
654.41   6320   191.7   11.56   327.5
654.92   6600   190.2   11.56   327.5
655.41   6840   185   11.22   327.5
655.93   7120   177.4   10.88   327.5
656.42   7320   107.5   6.46   190.17
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Tony@NefMoto
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« Reply #1 on: March 05, 2011, 02:13:36 PM »
You could be hitting the max corrected specified load limit - KFMIRL.
« Last Edit: March 05, 2011, 02:21:36 PM by Tony@NefMoto » Logged
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Rick
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« Reply #2 on: March 05, 2011, 10:28:57 PM »
KFMIRL is the master desired load map, so not sure how it could be a limit.  It's set at 210 which is around 1.4 bar boost.  Load is pegged at 190.  Im thinking this is VCDS limit?
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nyet
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« Reply #3 on: March 06, 2011, 02:36:54 PM »
Quote from: Rick on March 05, 2011, 10:28:57 PM
Im thinking this is VCDS limit?

Its been a long, long time since I used vcds to log MAF, but I think you might be right on this.. unlike the MAP limit, the VCDS limit seems to be lower than what the max (internal cpu represented) MAF data value is, which can be read properly by ECUx, since it reads memory locations directly.

Unfortunately, I don't recall the specifics
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Rick
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« Reply #4 on: March 06, 2011, 03:45:44 PM »
Never been able to find a working copy of ECUX Sad
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zillarob
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« Reply #5 on: March 06, 2011, 05:04:49 PM »
Do you know anyone that has it?
« Last Edit: March 11, 2011, 01:08:23 AM by zillarob » Logged
s4rmm
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« Reply #6 on: March 07, 2011, 02:21:37 AM »
Quote from: Rick on March 05, 2011, 10:28:57 PM
Im thinking this is VCDS limit?
VCDS limit is 364.08 g/s
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Rick
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« Reply #7 on: March 07, 2011, 03:55:39 AM »
I have a copy of it, which I can get to run after I changed my hardware ID, however it won't allow me to start a new project, keeps giving an  error message.

Rick
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zillarob
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« Reply #8 on: March 10, 2011, 11:02:43 PM »
You get my PM rick?
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