MS2 Boost duty reducing boost below Spring Pressure
 

HI from the (actually sunny today) UK. Sorry this is my first post but I am here for your experience and wisdom and all that stuff cos I'm confused.

MS2 If I run full duty cycle either normal or inverted then max boost is wastegate pressure! Basically if I pull the pipe to the wastegate it is the same as having 100 duty. To combat this I have a 23psi spring in there for the moment and I am happy with that but want to get the boost control working again so I can try to claw back some boost lower down. Fully aware I won't get much on a 20G with 8CM but anyway I'd like it to work! It used to work, and I do not remember changing anything.

I have screen shot where I am on 100 on duty and where I put 20 so you can see that is does most definitely reduce boost. This is not what I expect or what it used to do, which was work normally by holding actuator so that any duty showed a boost increase.

I have put on a new Actuator and Boost Solenoid to rule them out.

https://cimg3.ibsrv.net/gimg/www.mia...f779392db5.png
100 duty, if I posted with the actuator pipe disconnected it would be the same


https://cimg4.ibsrv.net/gimg/www.mia...6d1821336b.png
Here I was playing with duty. you can see what 20duty at 5500rpm does.

What have I messed up? In all my dicking about with cars for ever and evers this is a first for me so probably stupidly simple :)

Attach a log and tune, so we can rule out any software issues. Have you tested the solenoid in test mode to make sure it's wired and functioning?

Hi, solenoid is working and I replaced it anyway to be sure. If there was no signal I don't suppose it would do anything but every duty cycle change makes a difference, albeit in th wrong direction.

I will try to upload shortly.

Sat here trying to run through this in my head...I'm pretty sure you shouldn't be able to get the actuator to run less than spring rate. I mean the way its running I could put a 30psi spring in and use the duty to bring boost DOWN to 23psi 🤔😄

Open loop btw