![]() ![]() The average temps thus far (fall weather 75-80 daily) is 175.dropping to 170 on a descent at highway speed and going up to 180 when i'm climbing a gentle hill. I put in an OEM corolla thermostat (9091603107) and it doesn't go over 190 even if i'm really flooring it up a mountain on a 85 degree day. Now transmission temperatures are a whole other story and need to be addressed if you live in a hot climate and are supercharged. If none of that is applicable or desirable, keep the stock temperature one. If that is what you are after, then put one in. But that extra cooling headroom creates a lot more cooling capacity when I do some spirited driving and full throttle pulls from stopsigns and stoplights. This is a 5VZ-FE we are talking about and Toyota purposely overbuilt it to make it a strong engine. Does it create any sort of extra wear on the engine? I highly doubt it. Because ambient air temperatures can be as much as 140 degrees cooler than the engine coolant where I live, I will often see 165 degree temperatures when going 70 MPH on the freeway on a rainy/snowy day. It fully opens sooner but will still run between 195-210 degrees, 210 being a very hot day in stop and go city driving. You are correct that in the summer it doesn't do squat when it's 90+ degrees outside with the A/C on. I have the 170 thermostat and am also supercharged. But i think for supercharged engines, there is always the issue of ping and so perhaps thats why the cooler stat is recommended.dunno I know trd offered a 160 stat at one point for supercharged engines.i'm assuming that would run at 165 or so on average. If that's true, then this is on the lower range and if i go into colder weather, it will be running at 165 prob. I've heard (but not read) the FSM says normal operating range is 175-205. If i'm going drops to 172 or so.and if i'm going uphill 180.but on average its 175. My usual operating temp (here in socal with around 75-80 degree weather is 170-180. It's the same size/fit as the 4runner 180 oem.just seems to run 10 degrees cooler. I'm running a corolla oem thermostat thats a 170 degree one. Running too cool isn't optimal for engine lubrication and I know certain engine functions rely on input from the coolant temp sensor but I don't know if running 10 degrees cooler would affect any of those systems. ![]() If it does that, then it would make sense that it allows additional cooling benefits. What brand thermostat are you using? Maybe the one you're using opens up further and allows better flow. I've never ran as cool as you are with the 170 degree thermostat. For both thermostats, the engine will eventually get up to operating temp, which is around 188-194. Like I stated above, the thermostat opens sooner, but then it's open, just like the OEM thermostat does at 180 degrees. I've had a different experience than you with that 170 degree thermostat. My main concern is during the winter.the system is now running at say 165 170.are we accelerating wear n tear because the engine isn't at the intended operating temps? Is that something good? It definitely helps give the system a headstart when climbing passes but that's primarily a function of your radiator/cooling system. The main difference is that it seems to run things 10 degrees cooler on average. The next time I'm due for a coolant renewal, I'm going to ditch the 170 degree thermostat because it's doing nothing for me. It's when you're driving in hot ambient temps and driving up a grade that you want your cooling system to be performing well so you don't overheat your engine. It will keep the engine cooler in some circumstances, like driving down a mountain pass with no load on the engine, but that situation is never a concern. Once it's open, it's open, just like the OEM thermostats that open at 180 degrees. Yes, the thermostat opens sooner, but very quickly, the engine will get up to its operating temp anyway. My opinion is, they don't do shit in reality. I don't have a supercharger and I'm running a Stant 170 degree thermostat. ![]()
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