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Author Topic: KFLDIMX  (Read 5604 times)
20VTMK1
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« on: June 18, 2013, 11:53:21 AM »

Hi All ,

Am I correct in saying one of the ways to cure overboost , would be to re-tune the KFLDIMX in the region of the overboost  ? Lower the values ? S4 Wiki says that if actual is lower than requested you should increase KFLDIMX , so I figure the opposite applies to the region of overboost ( 3000 - 4500 rpm - K04-23)

Thanks
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nyet
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« Reply #1 on: June 18, 2013, 11:56:07 AM »

It depends on the type of overboost.

KFLDIMX should be tuned (roughly) to where you think your long term WGDC (pre-linearization) should settle at for a given boost/rpm

If that doesn't solve your problem, and you are overshooting on ramp, you'll need to re-investigate your PID (Q2 in particular)
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20VTMK1
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« Reply #2 on: June 18, 2013, 12:24:17 PM »

It depends on the type of overboost.

KFLDIMX should be tuned (roughly) to where you think your long term WGDC (pre-linearization) should settle at for a given boost/rpm

If that doesn't solve your problem, and you are overshooting on ramp, you'll need to re-investigate your PID (Q2 in particular)

Nyet ,

I have seen that a few tuners pick this up in the mid range , from stock , this on the BAM engine , 8N0 906 018 BJ/BQ ect . My k04 is overshooting by at least 0.2 bar , so I figured I could use this to dull it down a bit .
What exactly is meant by  long term WGDC (pre-linearization) ?

So perhaps I should look at making the Q2 7.5% in the midrange vs 9 % stock . Am I on the right path ?

Thanks for the help 
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nyet
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« Reply #3 on: June 18, 2013, 12:54:04 PM »

waste gate duty cycle, before KFLDRL

do NOT touch Q2 until you properly set up both KFLDIMX and KFLDRL!
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ME7.1 tuning guide
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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
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