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Old 02-16-2015, 05:11 PM
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My FX4, should throw in a 4R100 and I will send him this 02 navi PCM for cheap.
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Old 02-16-2015, 05:38 PM
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Originally Posted by ibd2328
N/A housing is the exact same, so all the stuff just bolts up. I went with a 195 degree thermostat so we will see it works. The thermostat opens up at exactly 195 via the X4, I just need to calibrate my efan controller to turn on and off accordingly
Originally Posted by ibd2328
Problem is, if you dont get an OEM t-stat the the O-ring has to go on the outside of the housing. In that case don't cheap out, get felpro O ring or OEM T-stat I had a 180 tstat in and it took 30 min for it to get to 200 degree's without fans on.
is that the thermostat you would suggest for the swap? Someone else told me a 150 and that didn't sound right
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Old 02-16-2015, 05:47 PM
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Never go below 180 with a fuel injected engine..
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Old 02-16-2015, 05:48 PM
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I knew it sounded off but why do many lightning owners swap to 150s?
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Old 02-16-2015, 05:54 PM
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Originally Posted by jferg92
I knew it sounded off but why do many lightning owners swap to 150s?
They have the truck's tuned in closed loop at 160 and it helps reduce hotspots in the heads as the coolant never get above 160-170. They also arent looking for mileage just power and not popping head gaskets.
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Old 02-16-2015, 05:57 PM
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Originally Posted by Carcrazygts2
They have the truck's tuned in closed loop at 160 and it helps reduce hotspots in the heads as the coolant never get above 160-170. They also arent looking for mileage just power and not popping head gaskets.
Most don't have a 4qt radiator/coolant capacity either.

Alot really depends on oil pressure and oil temps. OHC/lash adjusters/tensioners react slow at low temps and low oil temps.
Last edited by ibd2328; 02-16-2015 at 06:20 PM.
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Old 02-16-2015, 06:01 PM
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Originally Posted by Carcrazygts2
Never go below 180 with a fuel injected engine..
If you go below 180 that makes the efficiency drop doesn't it?
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Old 02-17-2015, 02:23 AM
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Originally Posted by Cmanjr
If you go below 180 that makes the efficiency drop doesn't it?
I guess it depends on what you want to be efficient. If you want longevity in a modular you should have the standard 180 t-stat. Some of the L's also have larger radiator capacities, aka dual core.

I ran a 170 tstat for about 2 months and my coolant temp never got to 180 at idle. That was with the stock fan setup. If your cooling system is decent you will have the best results with a 180

I only went with a 192 cause of the upgraded radiator and adjustable e-fans for winter time.

@jferg I def wouldnt do the 150. I can only suggest the oem motorcraft one from experience. Have yet to drive my truck with the 192, just let it idle for 30 min.
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Old 02-17-2015, 10:04 AM
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Originally Posted by jferg92
is that the thermostat you would suggest for the swap? Someone else told me a 150 and that didn't sound right
if you don't want to freeze your nuts off in the winter you'll stick with the 192..180 you'll notice it takes longer to heat the cab. It's not a red light truck and 160/150 are for performance all around. Engines run better (fuel atomization) when warm. Your setup will get the best use from a 192
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Old 02-17-2015, 10:37 AM
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Originally Posted by fordmotorsport
if you don't want to freeze your nuts off in the winter you'll stick with the 192..180 you'll notice it takes longer to heat the cab. It's not a red light truck and 160/150 are for performance all around. Engines run better (fuel atomization) when warm. Your setup will get the best use from a 192
Not sure what my truck has but I think it's a 170. My heat sucks but I never thought it could be the t stat. Coolant temp sits around 200-210 via SCT livewire.

Would a 170 tstat do this to me or do I have other issues?
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