radiator fan

[bryantkalagian]

i got one 12" electric fan on a cxracing radiator for my rb25det. it runs at a good temp now for daily driving, but i want to put a second 9" on a switch that i can turn on when im running hard at the track or in that nice summer stop and go traffic. does anyone know what CFM i should get? thanks

[Fibre guy]

Wow, one 12 is working for you?There's no standard test for fan companies to use for "CFM". One companies will be 1200 to them but only 800 to another.The best way to decide is to look at the fan blade design, fan AMP draw, and RPM. There is no magical way of moving lots of air without draw and RPM.

I say if that 12" is working great for you but another one just like it. You could easily fit both of them on the pull side.