Terminator 180 deg Thermostat - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 07-30-2014, 05:18 AM Thread Starter
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Terminator 180 deg Thermostat

I've been doing some research on the Terminator 180 degree thermostat. There's not too much about it on this forum, but other forums have blown up with positive and dissenting comments regarding having such a low temp thermostat.

I understand the concept behind it: trucks with performance mods create more heat, thus the reason to run at a cooler temp. But then there's this whole following of people who believe that the 7.3's are meant to run at hotter temps and that the oil needs to likewise be hot.

There seems to be as many pro-people as con-people. Does anyone here have any thoughts about it? Its a cheap and easy mod, but is it really necessary or helpful?

1996 F350 4x4 CCLB E4OD
Stage 1's, Tony Wildman Tunes, 6637 Intake, 5" Stainless Exhaust, Bilstein 5100's, FPR Spring Mod, Dark Blue CPS, Pillar Gauges (trans temp, pyro, boost), 6.0 Fan Mod, Tru-Cool Max Trans Cooler (and SD Cooler Lines), HPX Crossover, Alum Radiator, 203 Deg DieselSite Thermostat, '08 SD Alum Finned Rear Diff. Cover, PMF RSK (w/ V-Codes)
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post #2 of 5 Old 07-30-2014, 08:00 AM
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This is a gasser to diesel performance myth as far as I am concerned. Will the t-stat lower coolant temps??? Yes. Does a diesel run better at 170* than 200*??? Not a chance. Gassers need a cold block to make good power. Diesel combustion and especially our our HUIE injection method rely on the block being at a proper temperature for proper combustion. The t-stat also changes the temp of the motor oil being used by the high pressure system as well as the turbo. Cooler oil is thicker oil. Neither are good for tight tolerances or high shear environments. If International wanted the engine to be that cool they would have spec'ed it to be that cool. International spec'ed a 203* stat.

Joey's products are race produces that happen to work on the street. If all you do is race then it's a win to use this t-stat. If you use you truck like 99% of us other diesel drivers do then this is not for you. Incomplete combustion will coke your turbo in soot.

But this is just a simple mans opinion.

+ Matt - Star Tiger +
-Bean's: 160/100 (FF Injectors), 2/ 6-POS chips (TW & Beans tunes), Overboost controller, E-Fuel
-BANKs: downpipe, full exhaust, gauges, test pipes, intercooler
-Irate: T-4 kit, IC pipes, 3" Replacement Plenums, BASB Turbo
-Mag-Hytec trans. and pumpkin covers
-6637, CCV, IDM, 6.0 Fan, 49-Federal PCM swap, MAP line Mod
-370 Amp alt., 40k trans cooler, SRP1.1
-twin on-board air w/ 10 gal. tank

Re-pinning '97 Cali PCM to Federal
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post #3 of 5 Old 07-30-2014, 12:15 PM Thread Starter
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Well, that's kind of the direction I was leaning in too.

1996 F350 4x4 CCLB E4OD
Stage 1's, Tony Wildman Tunes, 6637 Intake, 5" Stainless Exhaust, Bilstein 5100's, FPR Spring Mod, Dark Blue CPS, Pillar Gauges (trans temp, pyro, boost), 6.0 Fan Mod, Tru-Cool Max Trans Cooler (and SD Cooler Lines), HPX Crossover, Alum Radiator, 203 Deg DieselSite Thermostat, '08 SD Alum Finned Rear Diff. Cover, PMF RSK (w/ V-Codes)
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post #4 of 5 Old 07-30-2014, 02:04 PM
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I ran a 203 on my 00 for many years. There was 0 difference in performance or MPG. The only thing I did see was the fan running more and high oil temps. I switched to a 180 about a year ago, the fan runs less unfortunately I haven't put enough miles on it to justify a oil change and sample yet.

So far I like the 180 better than the 203. The aftermarket temp gauge is dead on 180 and even in 20* weather warmup time and heat output seemed the same.

For my 95 with a short stem thermostat I tracked down an 192 from International that came with these motors. Install is still about 1 month off due to another part that is on back order.

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post #5 of 5 Old 07-30-2014, 05:54 PM
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Lower temp thermostats might be good for carboureted engines to keep the gas cool and prevent vapor lock, but not for computer controlled engines, most of the ecu's are programmed to run between 195 and 220 degrees, also lower temps just waste fuel and cause excess engine wear.
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