Cooling slim fan Mod issue

[8soupapes]

Hi guys;

I'm preparing my Hdi for a Stage 2 and recently fitted a intercooler with a pair of those 12" chinese slim fans rated at 80W (the OEM's have 120W as I could look)

 

This week I went out to test them and see the water temperature increasing easily over 105º, stopped the car and see the fans giving insufficient amount of air in the lower speed.

Searching on internet looks like the lower and fast speed are controled by the ECU, So is there another way to turn on the fast speed earlier "automatically"?  Lower speed looks useless now