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Thread: Ecotec Cooling System

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    Ecotec Cooling System

    Let me start out with I'm completely lost with how coolant flows through the ecotec.

    Ok so last friday I'm doing working on my tune a bit and notice my engine temp start to climb above normal. Pulled the thermostat out and test it. Not opening. So I decide, well if it was stuck shut, why not remove it and see what happens. So I've removed the stat and have idled and driven the car. It gets close to op temp but does not get too hot.

    I've searched and searched, I know how they work and I know the purpose of a thermostat, to heat an engine up faster. My question is what other negatives might exist with the thermostat not being in there?

    From what I can tell this is actually a good thing for a car that has no heat to begin with and is only driven on warmer days. Engines typically operate better at lower temps. So anyone have any more input on this?

    I don't plan on putting one back in unless someone can make a valid argument as to why I need one. I don't care why a normal car would need one, but I'm talking in my application. Is it needed?
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    I think its bad for a engine to be running too cool, i think its got a optimum range that the thermostat helps keep it at. I searched and just found that its too get the engine up to temp quicker to prolong internal parts life.
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    Yeah I read that too, but wouldn't parts last longer at lower operating temps? Think logically not what's being fed to you. Think beyond the "green" thoughts and theories that influence almost everything we read. I would think the exact opposite would apply. Cooler temps would result in longer lasting parts.
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    engines do better when they're run at the temperatures they're designed to run at.

    Before the advent of the heated O2 sensor, if you were to run without a t-stat, it would take forever, if at all, to go into closed loop.

    If you are curious as to which way the coolant flows in our system, typically where the t-stat is would be the outlet. The wax pellet in the t-stat is on the engine side and is what keeps coolant from leaving the engine until its warmed to open. Not to say all motors operate the same, but typically wherever the t-stat is that is usually the outlet from the motor back to the radiator.

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    My car never goes into closed loop. I don't even have an upstream o2 sensor anymore. Even if I did have an upstream, I've got hpt and could have closed loop happen sooner in the temp range.

    If you guys are wondering how the hell I've got this thing running open loop all the time and have the afr's good, it's called countelss hours of tuning and monitoring to get it just right. I've got it now getting about 28-30mpg's that's with the occasional rip through 3rd. That's 80lb/hr injectors and all open loop. I've not ran my eco in closed loop for almost a year and a half now. It does just fine without it.
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    OMG, the treehuggers must LOVE your car!!!

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    If you are not running the O2s then no you don't need the Stat in there. It should also prolong the life of your water pump as well.
    Other than taking a long time to heat up I don't see any negatives for your application.
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    Hopefully someone can help me remember correctly. But I test drove a G6 2.4L, and the temp gauge I THINK read 260red, 250 middle and 100 on the low end, after warmed up sat right around the 250 mark, which caught my attention because 250 is HOT.

    Now Idk about the ST cobalt race cars, but I know the BMWs in the GT and GT2 classes run those motors around 260 as well, I doubt its for emissions lol.

    I assume they run that hot to help atomize fuel and overall help the combustion.

    I run mine at 182F, but I also have a HUGE coolant system, if it starts to creep up, I can hold the RPMs to 2k or so and the temp will come back down without even using the rad fan.

    Id like to hear some input as well.
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    i ran with mine always open threw a CEL, but i didnt notice to much of a draw back from it, aside from it being winter and me having to wait for the heater to work x_x and my operating temp is arounf 190*f, car loves that #, but during DD i see it range from 190*-220*f...220 being stopped in traffic on a hot summer day


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    Hopefully someone can help me remember correctly. But I test drove a G6 2.4L, and the temp gauge I THINK read 260red, 250 middle and 100 on the low end, after warmed up sat right around the 250 mark, which caught my attention because 250 is HOT.

    Now Idk about the ST cobalt race cars, but I know the BMWs in the GT and GT2 classes run those motors around 260 as well, I doubt its for emissions lol.
    EcotecFiero Quoted Post
    Damn, that's really hot. It probably is for emissions. Do you know if they are running EGR on those motors?

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    Which motor?
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    Which motor?
    EcotecFiero Quoted Post

    any of them that are running that hot. Figure they gotta be doing something to control detonation running that hot.

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