just to put this question into perspective, the car I'm talking about is a 2007 Alfa Romeo 159 1.9l jtdm turbodiesel.
So, I was driving it and I needed a bit of life out of the engine, so to get the turbo to kick in I revved the engine to around 3500 rpm before shifting into 2nd and 3rd gear (I was merging into the highway). That's when my brother scolded me, saying to never high rev (remember, 3500 rpm max) a diesel engine in 1st and 2nd gear, even if it's in temperature.
I say it's bonkers, and you can "high" rev a diesel in low gears as much as you can in high gears. Otherwise, how can you get the turbo to kick in when launching?
Who would be right here? If you have any sources for your answer that would be great, so I can show my brother proof of whether he's right or wrong.