Cruise Data & Notes SCT XCAL fan settings: High 188°/Low 182° (fan shuts off at 176°) Ambient temp: 78° A/C: Off *Non-stop freeway cruise with 3-5sec WOT bursts: Nominal ECT range 174-178° *Saw highest ECT of 180° after a few back to back WOT bursts, lowest ECT was 172° *Fan did not run at all on the freewayMy impressions/interpretation of the data: In the 78° ambient temp it seems the ECT wants to settle around 174° as long as the car is moving at 50+ mph, which is a few degrees cooler than a 4.6L DOHC setup. Short WOT bursts resulted in no more than a 2° rise in ECT. Thermostat seems to flow to rad pretty well by 182° and the stock GT500 fan/radiator setup proved more than adequate, easily controlling temps with the low speed fan. I think this is testament that the GT500 cooling system is pretty well done. It’s hot-side thermostat housing design is superior to the 4.6L DOHC and favors high flow to the radiator, maximizing the larger diaphragm t-stat, with the coolant forced to take a 180° turn around to go back into the bypass. I feel confident that a 182° low fan setting will keep ECT in a target range of 176-184° under most city driving conditions.Independent results: http://www.teamshelby.com/forums/index.php?s=&showtopic=48116&view=findpost&p=800450 http://www.svtperformance.com/forums/shelby-gt500-150/628756-your-opinion-themostat.html#post8804191
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