So , if its is about 480 at the hubs , and about 550 hp at the engine

With the 2009 R35 GT-R being about 550 hp at the engine , going my calculators the car should be pretty quick.

The performance numbers should be a little better than the "guessed numbers".

If its 550 hp at the engine, and 4000 lbs (with driver) , then my calculators say -

Drag Racing Calculator

11.2 @ 121 . So probably in the 11.5 range would be realistic.