Blow off under low boost higher load

[Sugar]

I have been noticing the blow off more frequently under light throttle, up an incline. I have been able to get the cruise control set around 70ish and make this happen multiple times in a row up a hill.

I removed the bypass valves and checked the diaphragm for visual tears but see nothing. I'm leaning mkre towards a solenoid issue maybe but it is driving me crazy lately.

I did find one other person who replaced the boost control solenoid on his F150 who had this problem and remedied it.  Just wondering if anyone else has seen or heard of this issue. 

 

[ZSHO]

Here's a very similar thread that could be related to the 2015my. Z
Check you're turbo hoses and CAC (Intercooler) hoses to make sure the hose clamps are nice and tight.
The boost reference solenoid is a likely culprit which is a relatively a  cheap fix if that's the case. IDK. Hope this helps any.

https://www.ecoboostperformanceforum.com/index.php/topic,4958.0.html

 

[SHOdded]

Are you keeping track of boost levels?  Sticking wastegates possibly, and/or loose hoses atop the intake manifold, in addition to the above.

 

[Sugar]

I started reading through the post you sent, but not the whole way through everything yet.  My symptoms are not quite as bad as his.  I have some basic datalogs from recently and I don't see any Wastegate symptoms like his.  My wastegate typically changes to 1 in first gear and right around peak boost drops down to .75-.65.  Seems pretty normal to me.

My boost levels are not too abnormal.  Right now I am battling some boost drop issues in my E30 tune, but running the 93 custom tune I will see spikes around 17-19 at max.  I'm not sure if this is too high or not honestly with how these cars control boost.  It tapers down  right after as I would expect.

When I see this problem happening it tends to be at very low boost.  I don't even have to be steadily increasing throttle for it.  Like I said I can replicate it with cruise control on a small incline.

I have checked and tightened all connections I can access and have not found a problem recently.  When I first got the car I had some boost problems with the one line coming from the boost control solenoid and the clamp on the TB was so loose it almost came off.  These were causing surging and my boost levels going up to 22psi.  These were fixed before I ever noticed this new problem.