06 Acert MXS low boost on bottom end

Anyone have any problems of this kind? New twins less than 4 months, top end boost is still normal at 60psi, bottom end takes a while to spool up now, when tune was new (2 years ago) and again when turbos were new (3 months ago) I got immediate boost in all gears, now it seem like it’s mostly in the high gears. Took turbos apart last Friday, low pressure will touch sides if if push on it a little, fuel pressure is good at 110. Maybe boost sensor, maybe injectors? I don’t know.

 

No boost leaks that we can find. Haven’t tested pressure on wastegate opening, I was under impression there was only one wastegate. Does it open separately for low and high? No smoke. Thinking about going to Cat next week.

 

Valves were adjusted not long ago, pyro is a little warmer than it was before. But all of these specs were normal to me for about 2 years. It was only when turbos were replaced that I realized the bottom end boost I had been missing, I knew I also had it when the tune was put in but I was not familiar enough with the truck at the time I noticed it was gone, I thought engine was just getting tired.

I bought a boost sensor and atmospheric pressure sensor a couple of weeks ago but haven’t installed them yet.

 

It actually started after turbos were about 3 months old, and previously, about 3 months after my tune was installed. I almost wonder if ecm derates the boost somehow. Also I put a clamp on wastegate hose to test, would that have ruled out WG problem?

 

Thanks guys for your input, I’ll keep the thread updated as I go.