Turned up detroit feels sluggish

looks like 900 at 30 psi thats not all that good boost leak maybe

 

Yup. Could very well be a boost leak but being that it's sporatic leads me to believe it's a sensor or wiring issue.

 

Anyone else notice he's going 95 in the first video?

 

You might want to familiarize yourself with the metric system

 

i was doing 120 earlier today

 

I'm familiar with it. I didn't see it was KMH until I rewatched it and paused on the speedometer.

 

I have the same problem,ddec 4 and no power hard to keep speed up even with an empty trailer, hauled with a guy with an old ddec 2 no mods or tunes to ecm and he flew by me uphill and with a headwind and was gone like I was standing still, stupid thing is truck runs great never skips a beat just dead on the pedal, drives me insane

 

What are you making for boost and what's the horsepower currently set to?

 

Boost is just under 30 psi on gauge, horsepower is unknown all the stickers are missing off the motor all I have is the engine serial # ecm says year 2000 ddec Iv but it's in a 97 Freightliner the truck build sheet engine serial number is different than the one on engine so guessing the motors been changed

 

Based on your boost it's probably a 470 or 500. It should pull pretty decent. If they put the old DDEC 3 ecm on that DDEC 4 engine when they swapped it, that could effect the way it runs but usually when you have the boost, you have the horsepower. Are you running it low in the RPMs? How heavy are you hauling?