Pre-emission ISX turbo issue

[Chamberpains]

(05-12-2019 )Dakota Wrote:  I have a 2003 W900 with a 2002 ISX rated at 550hp, about ""3 YEARS"" ago I blew up the turbo and had Cummins put a new one on,after I got the truck back and took off down the road i got a check engine light and it derated

Is this a recent problem or are you just checking if a 3 year old remedy has a better fix?

I don't know the cm570's terribly great, but, it sounds like your turbo was over speeding and you opened the waste gate to dump boost. What is the peak boost pressure you're reaching? Have you tried to close the waste gate a few turns to see if pressure rises but stays with in specs?