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Old 07-29-2015, 02:06 AM   #1
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Default Won't follow target boost duty DIYPNP CL ebc

I'm trying to run CL boost control with a MAC solenoid. I know it is working because I can hear it in open loop. I make a target boost table and change the values from 165-190kpa and no luck.

Lowering P gets me to spike, but it will never hold. It always reverts back to wastegate pressure. Changing I and D definitely have an effect on the boost, so I know it is changing something. Wastegate is holding. I hit boost cut many times

No matter what I make my target it always reverts back to wastegate pressure.

I can get it to spool to the wastegate pressure 300 rpms faster, but it wont rise beyond that. It's like its stuck trying to target 160kpa.

Last edited by Grey Vw; 07-29-2015 at 02:24 AM.
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Old 07-29-2015, 08:05 AM   #2
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If lowering P makes it spike but wont hold to redline, did you then add I to hold to redline, and then lower P to get the target back up once you added I, and then a touch more I until it held better again, and then less P, and more I, and less P, and more I until you were happy, and adding a little D in there to keep things smooth?
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Old 07-29-2015, 10:35 AM   #3
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Made a dumb mistake, I realized I had it connected wrong. 0% was wastegate boost and 100% was closed wastegate. I now routed the lines on the solenoid in the correct orientation, so 0% is closed wastegate and 100% is wastegate boost.

I only tried it in "basic" with the slider since I only had the 15 minute drive to work. Still didn't work. I will give it a go in "advanced" at lunch time. Thanks for the input
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Old 07-29-2015, 05:17 PM   #4
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Got it running 14psi perfect and then my computer died so i didn't save the tune. After that I would hit false boost cut anytime i tried to make more boost.
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Old 07-29-2015, 05:26 PM   #5
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if laptop was connected, the tune saved.
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Old 07-30-2015, 02:02 AM   #6
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My boost gauge was reading 2psi lower than the MS, this is why I thought it was false boost cut. Got it running 14psi awesome now.
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Old 07-30-2015, 10:17 AM   #7
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Quote:
Originally Posted by Grey Vw View Post
Made a dumb mistake, I realized I had it connected wrong. 0% was wastegate boost and 100% was closed wastegate. I now routed the lines on the solenoid in the correct orientation, so 0% is closed wastegate and 100% is wastegate boost.
I know your car is running fine... but are you sure this is the correct way? I don't know what firmware you are running but with the latest one.. closed loop will only work if 0% = wategate boost and 100% = closed wastegate.
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Old 07-30-2015, 10:49 AM   #8
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I thought I read a post made by the programmer stating what was correct. I did have a suspicion that I am incorrect. I can only add P, adding any I or D makes it overshoot and be unstable.

Another weird thing is that even with just tuning with P, the boost is incredibly stable. +-5 kpa all the way
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Old 07-30-2015, 01:09 PM   #9
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On the latest firmware 100% is closed wastegate.
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Old 07-30-2015, 04:00 PM   #10
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My settings are 0% duty cycle closed, %100 duty cycle open and then have "inverted" selected.
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Old 07-30-2015, 05:48 PM   #11
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Quote:
Originally Posted by aidandj View Post
On the latest firmware 100% is closed wastegate.
Thanks for the confirmation.

Quote:
Originally Posted by Grey Vw View Post
My settings are 0% duty cycle closed, %100 duty cycle open and then have "inverted" selected.
As long as it works
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