[Pete]

I had a 55GPM electric WP in my Z for about 4 years, as everybody knows i don't road race or any kind of circle track racing only drag race.
The 55GPM with 160* t-stat with holes and fans on at 170*it was awesome in hot summer traffic if i left my Z idling for a while she would run up to temp fans on at 170* it would cool her down 165* fans would go off it would do this all day long.
Remember the electric pump constantly pumps 55GPM no matter the RPM.
Went back to stock water pump what i notice is my fans run nonstop (fans on 170* same T-stat) in traffic once i start moving and get air to the radiator is the only time she will cool down to 160-165.

I think with stock water pump we need more air to radiator.
Tony Davila has tested/added an extra fan to the front of his radiator and he has mentioned it helped keep temps down.

Hope this helps.
Pete