wolfram

I know this has been discussed quite frequently on here already, but has anyone had issues with not being able to tune out the boost overshoot? I have P set super high (170 to 199) and it doesnt seem to help, even with D set high (50 up to 190). I have even tried those high settings with a little and a lot of I, and it all doesnt seem to matter how it reacts. I have a TD04H that is set to target 180 (12psi) in closed loop duty, and it continually shoots way past to 16+psi. Any ideas?

red93spyder

iTrader: (1)

I am in the same boat with you. Internal or external gate? I am going to switch from running the dual port on my tial EWG to just the side. The same way an internal should be set up from the solenoid.

wolfram

its internal. I have thought that maybe the DIYautotune's EBC documentation could be wrong, cause i have checked everything. Funny too, even long 4th gear pulls it will overshoot, but when i am out on I-70 and can open her up with long 5th gear pulls it tends to be more steady, so i dont think it has anything to do with my closed loop map. Sucks too, cause i havent hooked up a TPS, so i have to put all my map values in the 0 TP row across all rpm columns

red93spyder

iTrader: (1)

Just got back and no change for me besides slower spool. Open loop is fine and CL is still over boosting even with my EWG plumbed like an IWG.

wolfram

So, just out of curiosity, what did your open loop map look like? What duty % was close to 12psi? That's my last resort as of now, and with this stock 1.6L hitting 16psi cant be good, not to mention the fuel cut jerk at 6K...

Braineack

iTrader: (62)

someone who doesnt have EBC himself working shouldn't be "helping"

wolfram, see my responce in red93's thread on the same damn topic.

wolfram

I saw your post in a similar thread and started with 180 P and I and D at 0. I still overshoot the target considerably. I tried 200 with same result. Whats up with the settings above that for Open Loop % and Closed Loop %. Both of those are set to Zero.

Braineack

iTrader: (62)

you need to set open duty to 100%, bro. and use 39Hz or whatever the selction is.

wolfram

so if i am using closed loop, i need to set closed loop to 0, and open loop to 100% in those two fields?

Braineack

iTrader: (62)

that's closed wastegate DUTY and Open wastegate DUTY.

that's the DUTY cycle of the wastegate. The software requires that the closed value must be lower than open, and since the solenoid at 100%DC would keep the wastegate fully closed, you must select inverted. If the solenoid is at 0%, boost passes through fully and keeps the wastegate open at wastegate levels.

Erat

iTrader: (5)

Is there a way to cycle the solenoid to see if it's even working?

Braineack

iTrader: (62)

use open loop mode, set the table for 50% or something, get it to activate at idle, put your ear to it and listen for rapid clicking.

Erat

iTrader: (5)

Well i guess i found my problem. No clicking.

Braineack

iTrader: (62)

how's it hooked up?

should have one wire on a switched 12v supply.

then the other goes back to the MS.

wolfram

Does this look normal? Sorry, for stealing my thread back. This is the only way i can get close to hitting 12ish and it holding. It still fluctuates a bit from 9 to 12psi up in the 5-6.3K range, but its about as close as i can get it. Any ideas on what could be wrong, or tips on my PID numbers? On my data logs i show the boost duty all over the place going from 0 to 100 every .5 seconds. Doesnt seem right, but its the only way i can get it close to working normally. See attached screenshot for my PID values. I have 180 in every cell above 3500rpm's all the way up and out of my table.

Braineack

iTrader: (62)

what firmware?

P and I should end up a lot closer to 30, and D closer to 100.

wolfram

Just to give some more detail. When i start with 200 for P, and 0's for I and D. I get about 5psi that holds steady. When i start to lower it it will hit 5psi then oscillate (pulse or surge about one psi at a time upwards. When i lower it more it will pulse to a higher final psi. This is when i start adding D, but that high 185 number is the best i could do for it to stop pulsing. That just seems awfully high. The I then finally smoothed it out as best i could. Just doesnt seem solid or correct for that matter.

wolfram

Not sure on the Firmware, as i am not in front of it now. It was the standard FW that came with the PNP i bought directly from DIY about 6 weeks ago...

Braineack

iTrader: (62)

you're not doing it correctly.

Tuning the P term is solely to get to your target, increasing I will hold it to redline.

You should tune P only by spooling the turbo, you shouldn't need ot go any higher than 5000RPM and you should probably just use 2nd or 3rd gear.

Spool up, check peak level. and keep lowering P until you've breeched your boost target. Only then should u move into tuning I, then D.

wolfram

I have tried that similar approach with quick spools in 2nd gear, but it always overshoots. Its strange that at 200 it will quickly get to 5 then pulse onwards. I would assume this to be the 5psi range equivalent of that P value. Moving P downward yields about the same results, but there is no linear factor (it seems). Suddenly going from 150 to 145 will allow full boost all the way to 15+ before the boost cut kicks in. It will spool quickly to 15+ with a value of 145, but with 150 it shoots to 5 and pulses its way up like it did with the 200 value. Do the closed duty and open duty numbers of 0 and 100 respectively need any tweaking? Just seems very strange.