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https://www.garrettmotion.com/turbocharger-technology/

I stand corrected. too big would have lag. too small would have excessive exhaust back pressure.

I'd first see how it runs. https://highwayandheavyparts.com/n-12787-adjusting-diesel-engine-injection-timing.html

Over boosting with a huge turbo, would show up with low EGT temps but with lack of power, without the addition of more fuel. When you add fuel to your high boost pressures, the EGT goes up. 15-20lbs of boost should be fine for this engine, but I don't know how much more boost would cause head...

https://www.quora.com/What-do-we-use-in-diesel-engines-rich-or-lean-mixture?share=1

the EGT could be misleading. Be careful of a over lean situation...too much boost, not enough fuel.