Thermo fans - twin vs single.

[1TUFGQ]

Hi guys

I've had a crack at searching but not coming up with much.
Can anyone point me to good threads on thermo fans please.
I'm looking for info on twin vs single and what's best, also cfm rates.

I have an XF Fairmont with a 400, I think the twin thermo fans are EF/EL.
They do keep it cool but i'm looking to improve the cooling without going clutch fan (no room).

Opinions on AU - FG fans please?.
Do the BA - FG turbo cars have differing fan blades between Turbo and NA?.

Thanks in advance and merry xmas from across the ditch.
Admin, please move to correct forum if need be.