Cummins x15 hill pull weird noise

I have the same thing on my 22 performance. Pulling hard in 1500-1600 rpm usually in 17 gear doing about 65 mph but also in other gears. Took it everywhere including Cummins. Fuel pump was not aligned, they fixed that. Made it a tad quieter but noise and vibration is still there. Sounds like a Blackhawk helicopter. No body seems to know what noise is. Great video. I showed them mine too. No help on issue. When this guy blows I’m not rebuilding. Gonna put in a 60 series or N14.

 

Does it always do that on a hard pull? almost sounds like a regen in progress.

 

Emission motors don’t like to rev to 2000 rpm . Many will cut back on power to maintain emissions.. check out a power curve graph on your engine you might be surprised.

 

I’ll say what an old boss of mine said when I told him the truck sounded weird.
“Just run it, if it breaks then we will know what the problem is.”

That truck still going and it’s got like 1.2 million last i looked.

 

It’s not the emissions. My performance x15 runs high rpm an efficiency x15 less. Some techs thought it was fuel delivery, others ride height. Spent weeks at multiple shops. Nobody can fix a truck anymore.

 

OMG that's high RPM's! That's why!
I've never had an older truck over 1550 and my 2022 X15 never over 1650. Anything over that sounds like asking for trouble.
My 6nz runs 1300 and doesn't know what a load is!
New ones have no power at all until at higher rpm but that's too much. New trucks have no low end torque at all. I think they rigged it that way for higher RPMs and more heat to burn cleaner. IMO

 

My 2021 x15 500 e sounds like that at any rpm.
If you don't have the gears, then fine, 2k rpm might be manageable, but if you have another gear that can keep it closer to 1500, it would sure help the fuel usage and longevity.