MoTeC Global Forum

Looking at my logs I see Boost varying from 213-235Kpa on an aim boost of 224.... it is a very consistant sine wave. So I guess my other parameters are driving boost control to be over controlled. Proportional, integral and derivitive gain are all set to 2.0... why, because the help example described 2.0. The peaks are about .57 seconds apart, so about 1.75Hz sine wave. This is steady wide open throttle, rising rpm in top gear.
Anybody have a suggestion what might flatten that our a little
Thanks for all help of suggestions.

Have you watched the Gold Box webinars on Boost Control found on this page:

https://motec.com.au/training

I think if you follow that procedure you will be able to dial in rock solid control

Good day stainless1,

Mr Ferguson is correct, there’s a wealth of helpful information available on the official YouTube channel. It is highly likely that you will understand what’s happening after reviewing the best practice demonstration.

Having said this, attaching a log file for review might go a long way towards helping anyone identify what you’re noting. Even if you send a screen shot to start with, there are some key data parameters you should be looking at together with manifold pressure that will reflect the big picture.

Also, you might want to start your boost control strategy in open loop first. What you’re trying to accomplish using PID is usually best left for your finishing touches. Even if your open loop was spot on and things go odd when PID is enabled, it’s usually easy to find your smoking gun.