How do I make radiator fans start at a lower temp?

[ALarracuente]

Hello Gents:

I wish my 99 Boxster would start the fans a tiny bit sooner that it does. They actually start a quarter of an inch before the 220 mark. I guesstimate is 200 or so.

It is 85+ all year round here in Puerto Rico and traffic jams are common. I have a lower temp thermostat 160F from LN Engineering and the car takes a while to get to that level. Even then, I wish they would start a little sooner. I know what heat can do to cars in the long run.

What would be the best way to accomplish this?
Does the DME controls this or is it a thermostat switch like other cars?
Does anybody have any suggestions on the suggested temperature?

I think 180-185 should be ideal to me. I use 15w50 M1 oil all year round.

Thanks beforehand for your comments and ideas,
Fred Larracuente