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There's a lot of dynamics I'm sure (and I'm overly simplifying), but bigger turbos equals bigger power simply because:
1. Bigger compressor (in general) produce less heat at same airflow
2. Bigger turbine and turbine housings provide greater "torque" (less back pressure).
Couple together equals more power.
The trade off? Lag.
But, modern turbos have came along ways!
Smaller compressors are delivering more airflow and turbines have gotten less restrictive and decreasing back pressure. There's the dynamic part.
60mm on one turbo brand may flow more/less than another 60mm.
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