The oems spend tons of time, money, and energy getting every mpg, hp, and reliability for a given setup and price point.
What makes you think an extremely cheap change of tstat temp change is going to make an improvement.
Here is some tech.
Running an overly cool tstat with no big external oil cooler with cause the oil to degrade faster due to water contaminating the oil due to the greater temperature differences creating condensation.
If you have a scanner than can, watch your fuel trims both short term and long term with a cooler tstat. The ecu will add fuel due to cooler intake air temp, and/or cooler engine temp. Seen it, done it, moved on.
When you run either cooler, you change which cell in the fuel table the ecu uses. To explain this in greater detail would take much more time and words. Google how fuel injection works.
Most factory tunes are more rich than necessary to make the engines last several hundred thousand miles.
If you want more power, lean it out, or advance the timing. Either of which in excess will damage any engine....
Aluminum warps due to temperature swings, not necessarily high engine temps.
Ie: You put in a 160 degree tstat. You start your engine, tstat is closed, engine temp goes up to 200 ish as the tstat opens then drops to 160
As that cold shot of water from the radiator enter then engine.
If you are seeing temp swings, that's bad.
Electric fan conversions,
Cold air intakes, under drive pulleys, etc are all attempts to free up engine hp.
Most people trick* an engine to run more rich by cooler Tstats, so they are able to advance the timing more.
Cooler temps also keep from having preignition or detonation issues with advancing the timing more.
Cold air intakes are pretty self explanatory trying to increase a denser air charge with more oxygen to then engine. An extreme version of the same principle is a dry nitrous system.
Since we are talking about your tow rig, leave it alone. It's what you rely on to drag your rig around and get you home. Stick to simple stuff.
Cold air intake, k & n filter, better exhaust etc. Keep reliability in mind. Underdrive pulleys reduce ps pump pressure, reduce alternator outputs, slow down the water pump, and none of that sounds good for a tow rig.
Mechanical fans are the most reliable and most efficient means to pull air through the radiator at a rate matches to engine speed. Improve them by finding a clutch that locks up sooner than stock, or a fan with bigger or more blades.
Don't try to squeeze every hp out of the truck, you'll get there. It's far better and safer to spend your upgrade money on better or bigger brakes.
Drilled slotted rotors, bigger rotors, bigger calipers. 2500 brake conversion, hydroboost conversion, stainless lines, Kevlar pads, trailer brakes on each axle, breakaway brake box, weight distribution hitch, etc.
Save your electric fan and Underdrive pulleys for the Cherokees. Keep your tow rig as the most reliable and safest transport home. This will allow you to have more fun beating on your rig, with no sub conscious worry of how to get home.
Throw it on the trailer and drag it home.
Get up and go to work the next day.
anyways cause of #4 cylinder so i will change it then.
