Installed NOx Filter, Now Won't Make Boost
 

It would take a lot to make it to 34 lbs w/ my delete pipe, now it takes a lot more to make it to 15. That's if it doesn't hit 1400 deg. first. Wondering if maybe the Nox Filter is plugged off severely??

? did you just put the catalytic converter back on? or did you install an aftermarket DPF on your truck? either way Montana isn't getting emissions laws anytime soon so I'd just take it back off

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and I have a cat laying in my garage, you pay shipping or come to Bozeman and it's yours

Is it plugged, or is my turbo crapped out??

well sounds like it's plugged, but i don't know, I've only ever taken them off never put em back on, if it was making 34psi of boost prior to installation i would say it's plugged, how hard would it be to take it back off? i'd hate to tell you one thing, but at least if you take it off and boost climbs normally again you'll know the problem

Another reason I put it on was because it took a lot to make it past 25. Figured it was too wide open (if that makes sense). I'll have to have a new piece of pipe made I guess. :argh:

are you running any sort of aftermarket tuning? because i know my truck when stock struggled to get up into the 30 range with a totally free flowing exhaust

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these he351's don't go bad that often i don't think unless pushed ridiculously hard so i don't think that is the issue

Running a Smarty JR.

K it should make boost regardless of if the NOX filter is on or not, any codes? if you have an open area and a good friend check for boost leaks, because it's an 06 it has the metal end caps on the intercooler whereas the 05 prior have the plastic and i've seen those separate at the ends and have similar symptoms as you're having only they wouldn't make over 2lbs of boost, and they replaced the turbo that they thought was bad and sure enough the intercooler was split at the ends, i guess it's possibly a crack in the intercooler, I just don't know, Internet diagnosis is not fun

Isn't that the truth.....
I like to always put exhaust together with those wide band clamps (Like they use on the big rigs!). That way it is real easy to take it back apart if need be. I'll see if I can post up some pics of mine.

No matter what: You can't have the exhaust 'too open' or too free flowing!! The turbo is the restriction in our exhaust and ideally we would want no pipe on the exhaust side turbo for it to work at it's very best. Since that isn't possible, we install the largest pipe we can and make it as free flowing as possible. A diesel engine doesn't like any restriction in the exhaust!! (And gassers only like a very little!!)

Last night, out of curiosity, I turned it around. Went on a little trip out of town just a bit ago, and as I was climbing a hill, I noticed a little black smoke. So I hammered it, and if the wind wasn't blowing like it was, I'd a choked out the driver behind me lol. So however much of whatever was in there, is gone Johnson. Drives like I don't have the filter installed for now. :tu: