Both Y. Gordon (“Famous Russian Aircraft – Sukhoi 27”) and P. Butowski (aviation journals articles) give Su-27SM 120 km detection range for a boat and 350 km for an aircraft carrier.

you are not understanding what I am writing to Mspsher. I said what radar in 2004 outperform Su-27SM? real specification not some theory.
the pictures will give you clue that no change in aerodynamics despite increase in internal fuel capacity.
the length of flame shows very strong thrust.