|
Title: KFLDIMX Post by: 20VTMK1 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 Title: Re: KFLDIMX Post by: nyet 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) Title: Re: KFLDIMX Post by: 20VTMK1 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 Title: Re: KFLDIMX Post by: nyet 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! |