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SVT Shelby GT500
Your Opinion on themostat.
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<blockquote data-quote="jm@ReischePerf" data-source="post: 8743052" data-attributes="member: 48129"><p><strong>Prototype Test Results In!!</strong></p><p></p><p>I'm very pleased with the results and happy to announce that production of this thermostat is a go. They should be available from me or Lethal Performance within a week :banana:</p><p></p><p></p><p><strong>FORD 5.4L DOHC IDLE ECT DATA</strong></p><p>Test vehicle: 2007 Shelby GT500 w/OEM radiator (03 DSG Snake)</p><p>Control conditions: 5 min hot idle with A/C on low, cooling fan on</p><p>Logging performed: August 31, 2009</p><p></p><p>*Stock OEM thermostat (Motorcraft RT1185): Sustained ECT of 196° @ IAT 98° - hood open</p><p>*170° Performance Thermostat (Ford 5.4L DOHC): Sustained ECT of 182° @ IAT 160° - hood closed!!</p><p></p><p><strong>Cruise Data & Notes</strong></p><p>SCT XCAL fan settings: High 188°/Low 182° (fan shuts off at 176°) </p><p>Ambient temp: 78°</p><p>A/C: Off</p><p></p><p>*Non-stop freeway cruise with 3-5sec WOT bursts: Nominal ECT range 174-178° </p><p>*Saw highest ECT of 180° after a few back to back WOT bursts, lowest ECT was 172°</p><p>*Fan did not run at all on the freeway</p><p></p><p>My impressions/interpretation of the data:</p><p></p><p>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 the 182° low fan setting will keep ECT in a target range of 176-184° under most city driving conditions.</p></blockquote><p></p>
[QUOTE="jm@ReischePerf, post: 8743052, member: 48129"] [b]Prototype Test Results In!![/b] I'm very pleased with the results and happy to announce that production of this thermostat is a go. They should be available from me or Lethal Performance within a week :banana: [B]FORD 5.4L DOHC IDLE ECT DATA[/B] Test vehicle: 2007 Shelby GT500 w/OEM radiator (03 DSG Snake) Control conditions: 5 min hot idle with A/C on low, cooling fan on Logging performed: August 31, 2009 *Stock OEM thermostat (Motorcraft RT1185): Sustained ECT of 196° @ IAT 98° - hood open *170° Performance Thermostat (Ford 5.4L DOHC): Sustained ECT of 182° @ IAT 160° - hood closed!! [B]Cruise Data & Notes[/B] 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 freeway My 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 the 182° low fan setting will keep ECT in a target range of 176-184° under most city driving conditions. [/QUOTE]
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