Theoretically the rod to stroke ratios of the 3.5's weren't as good and weren't able to take the rpm's that a 603/602 could, so they set the govenor lower.
What is the consensus on the safe rev limit for a turbo 602/603?
Mine I can take to 5k but I will typically shift at 4500rpm due to the power falling off...
Would 5500rpm be to much, I'm sure it's well out of its volumetric efficiency, but the 602 almost revs like a gasser, so more revs can be useful when burning out or generally ripping

__________________
97 e300d, 78 300Dt, 95 E300d, 94 E320 estate