seems really high for the I value, you shouldn't be over like 40-50 on any value--MAYBE D. that's what causing it.

start I at 0 and increase until it can hold the target to redline--its long term tracking.


aidandj gets props for the drop shadowed screenshot.

 

Did you tune basic mode first?

 

Wait a miniute, I'm dumb. I meant P, not I. I have I and D set at zero right now, I've been following this, starting at 150 and working down.



To Tune PID:

1. Set Integral and Differential Gains to 0% - To make tuning the Proportional gain easier, set the Integral and Differential gains to 0%.

2. Set Proportional gain to 150% and slowly lower - While tuning Proportional gain, higher numbers mean slower boost climb and lower final boost. For safety, start with a very high gain (150% should be sufficient). Find the RPM that typically spools quickly, and fully and quickly depress the accelerator. Note how much boost is reached. If boost overshoots the target, increase the Proportional gain. Otherwise, reduce the Proportional gain and try again. Do this until boost reaches the target with little or no overshoot.

3. Tune the Integral Gain - The next step after the target is reached consistently is to tune the Integral gain. Starting from the RPM used to tune the P-gain, fully depress the accelerator and watch the boost as the engine climbs through the RPM range. As the engine accelerates through the rev range, the boost will probably creep away from the target. Keep increasing the I gain until the controller adequately maintains the target with minimal oscillation.

4. Tune the Derivative Gain - If overshoot cannot be tuned out with the P gain on a quick acceleration, increase the D gain until the overshoot is minimized. Care must be taken when increasing the D gain as too much D gain can over-dampen the effects of the P and I gains.

No basic mode, does that slider do anything in PID mode? In MS2 that's all you get with basic AFAIK.

 

Here is an example of just basic mode:

 

No initial overshoot. I also have the lower limit delta at 27kpa. If it is lower than that, it will want to overshoot. I don't think the EBC can react quick enough to prevent overshooting with a lower delta, especially if you stab the throttle in a higher gear.

 

With the new code it does pretty well

Here is my best pull from this morning with a 20kpa delta

Peaks at 189. Max 192.

 

Also, is it still set as 100%=less boost? That won't work.

 

Nah, that's been inverted again. 100%=allofit

 

OK good.

Also the slider is active in advance mode. Remember that.

 

OSX. Cmd+shift+4 then space bar.

 

If you have PID set so you have a decent boost plot, what would adjusting the slider do? What necessitates slider adjustments?

 

You should use the slider first then use the PID.

Quotes from Ken, the dev:

 

That's how I saw it, but when I had slider even at 0, I would still get wild oscillations. However, this was with delta at 14, and intervals at 20ms... it could have been those factors that made the slider ineffective.

 

I had the same issue, there is now test code that basically desensitizes the slider, it made a huge difference for me.

 

Just for *****, here is a 4th gear pull from 55 mph, then shifting to 5th and goin a little more:



Any idea what I can do to help lessen that dip after I get into 5th?

Here is the settings I currently run:

 

Looks like too much I. That looks like integral windup to me. Also tune the slider if you can.

 

I was tuning I this morning, and the boost was getting more stable the higher "I" was.

Haven't really messed with the slider tho.

Was thinking possibly tweaking the initial boost duty in that particular area might help too.

 

Also try some D. That will slow the response and maybe help smooth the peak.

 

Side note: Target is 15psi, it peaks at 15.1, dips to about 14.1 and then stabilizes around 14.7~14.8 so the dip isn't that significant...

I'll try adding some D by what, 5 points at a time and see what happens?

 

Start with 1. Then 2 then add 3 etc. Make small changes. It should hopefully smooth the peak into a curve and not drop the duty so low.