170 Thermostat?

Well, if you really gotta know, lol...

I'm running a Blueprint Engines 408 high performance, street/strip.

I have a Derale fan controller controlling Derale fans. They have a 15 degree gap between on and off. So with a 180 therm, I would have to have them come on at 198 or so for them to shut off in conjunction with the thermostat. I don't want it to get to 198, that is too close to the top. If I had a 170, I could turn them on at 190 and they would shut off at 175, or 190 to shut them off at 170.

198 is too hot here in Tx where the asphalt gets to 150 easy. When the atmospheric temp is 105, it just won't cool from 198. Too hot. I don't like pushing it to 198 or 195, I could turn my head away from the gauge for 2 seconds and it could go from 195 to 210 in a heart beat, plus, it takes a lot longer to cool from 195 than from 190 even. It is either the 170 or 160 in the summer here, or it won't cool. In the winter, I can run 190 without a problem, but I would still need a 170 therm to do that.

If you know how to set a Derale fancy controller to start and shut off within say 10 degrees, I could keep the 180.