http://www.not2fast.com/turbo/maps/t04e-60.gif

If the Air flow you need is calculated right and it goes through the center of the map, its in its highest efficiency range, which would be a good choice as you would have a good spool, and meet your power goals, with a good power band. Also if the other turbos are in the map, their efficency is just less than the T3. The T04b is probably the worst turbo ( for your setup) on the map, since it has a pretty large turbine housing, and a decent size compressor wheel.


Here is a good read, with the formula that I use when trying to calculate turbos for customers

http://www.turbobygarrett.com/turbob...o_tech103.html