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160 Thermostat Hypertech question

This is a discussion on 160 Thermostat Hypertech question within the General Help forums, part of the LSx Technical Help Section category; I just install the 160 thermostat in my 2002 trans am. The temp still sits right below 210. There doesn't ...

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    WS9 + Y82 = Trans Am 6speedTAthistime's Avatar
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    160 Thermostat Hypertech question

    I just install the 160 thermostat in my 2002 trans am. The temp still sits right below 210. There doesn't seem to be any change. does this happen because of the dummy switch that only shows overheat condition? Or should it read lower?

    any bit of help is appreciated.

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    Member chieftransam's Avatar
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    i have this same problem..

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    Slow SS
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    a 160 degree thermo just opens up at 160, witout the rest of your cooling system backing it up it won't really make a difference. IE: changing fan settings to come on sooner, better radiator, get the crap out from infront of the rad.

    Personally I dont really agree with changing thermo temps. Unless you are running a power adder that benifits from it (FI/N20), AND your car is tuned to run correctly. The thermostat doesn't keep your engine cool, it keeps your engine warm enough to run correctly. Messing with it without a tune does goofy stuff like ruining fuel economy because your computer never goes into a closed loop.

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    Life in the Fast lane sunsetorangess's Avatar
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    Quote Originally Posted by dlbrando View Post
    a 160 degree thermo just opens up at 160, witout the rest of your cooling system backing it up it won't really make a difference. IE: changing fan settings to come on sooner, better radiator, get the crap out from infront of the rad.

    Personally I dont really agree with changing thermo temps. Unless you are running a power adder that benifits from it (FI/N20), AND your car is tuned to run correctly. The thermostat doesn't keep your engine cool, it keeps your engine warm enough to run correctly. Messing with it without a tune does goofy stuff like ruining fuel economy because your computer never goes into a closed loop.
    yepp, He speaks the truth, unless you tell your computer its there your just wasting your time.
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    WS9 + Y82 = Trans Am 6speedTAthistime's Avatar
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    I'm getting tuned monday, and the tuner told me to get a 160 thermostat. i just thought that it would be a little cooler then the stock thermostat.

    But i see what you are saying.

    Thanks for your help

    I'll see what happens after the tune.
    thanks again

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    Opening the coolant flow sooner and turning the fans on earlier help to ensure that you do not reach the 220+ degrees that happens in hot weather and slow traffic. Lower temps are required when tuners optimize your air/fuel and timing. When these hottest temperatures occur your ignition timing will be retarded because within your PCM are tables that associate engine temperature with performance to protect your engine from detonation (knock). By cooling your engine a little more the PCM can keep your timing in the better performance matrix where it can maintain more timing advance to improve performance and fuel economy. Fuel economy is usually not mentioned with a cooler running engine because this is considered a performance modification and higher octane fuel is used for a more aggressive driving style.

    This modification isn't much different than driving your car on a cool day as opposed to a hot one and that should give you some idea of its potential and effect. There is a point where being too cool will keep your engine in a commanded closed loop mode where a/f stoichiometric is not achieved and the engine oil cannot become hot enough to purge away fuel contaminants. Generally a 160 thermostat and lower fan-on temps do not cause this. Removing a thermostat altogether does....

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    Slow SS
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    not sure, ls1 stock is what like a 185 thermo. I went through this on a jeep forum and it took a Jeep tech to convince people of it. Granted, a jeep runs a 195 thermo so the radical change to a 160 will cause it to dump fuel in order to warm the engine up to its correct operating temp. I have a friend who is going through this now, and when he switched back to a temp range within his computers limits his gas milage and power magically increased again.

    Running too cold a thermo, no thermo, and one that flows much faster than designed can all cause your car to run hotter, or not well at all. The last two can actually run hotter because the coolant doesnt spend enough time in the radiator to dissipate heat, flows too fast.

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    MOTOR CITY MARO' SSTODD's Avatar
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    Your gage is basically a "dummy gage" so it will not show that change from 187 to 160. But the computer knows and that is the reason a tune is needed.

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    Grand Imperial Wizard Sarge's Avatar
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    Stock tstat and fan settings resulted n 205-210 for me.
    160 Tstat and lower fan temps turn on resulted in 190 temps very consistantly....unless I just sit in traffic all day and themn it goes up to 210 again.....the biggest thing you can do is have the fans come on at like 180.....

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    Junior Member gbenz's Avatar
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    Where do you take car to get tuned? Do they have a dyno as well? I am in the Cincy area as well!
    No matter where you are is where you are!

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    Junior Member sreve's Avatar
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    put a 180* in mine, gauge still reads 210* although i can see the change with a scan tool. the only gauge half way right is the speedo.

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    Quote Originally Posted by 6speedTAthistime View Post
    I'm getting tuned monday, and the tuner told me to get a 160 thermostat. i just thought that it would be a little cooler then the stock thermostat.

    But i see what you are saying.

    Thanks for your help

    I'll see what happens after the tune.
    thanks again
    After the tune, I would suggest switching back to the stock stat. You are gonna use so much gas with the low stat.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    I think 98 F-bodys are the only ones that read somewhat close to actual temp.

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    After the tune, I would suggest switching back to the stock stat. You are gonna use so much gas with the low stat.
    why? mine doesn't use anymore with the lower t-stat.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by mrr23 View Post
    why? mine doesn't use anymore with the lower t-stat.
    You are in Florida where it is warm and he is in Ohio where it is cold. The engine needs some heat so that it can run efficient in the cold.

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    Senior Member mrr23's Avatar
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    so, because you are up north, you should put the factory 210* t-stat back in?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by mrr23 View Post
    so, because you are up north, you should put the factory 210* t-stat back in?
    I am not sure if the factory stat is 210*, but Harris Speed Works suggested putting the factory stat back in for the winter months.

    I was getting horrible gas mileage and the engine wouldn't heat up. It would run around 160*, I would have to let it idle for a long time, then when I started driving it dropped way to low.

    I put the factory stat back in and it warms up faster and stays at around
    175* and my gas mileage is back to normal.

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    Senior Member mrr23's Avatar
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    ah, now we're narrowing down the reason why. for the winter months, put it back in.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by mrr23 View Post
    ah, now we're narrowing down the reason why. for the winter months, put it back in.
    I don't understand your statement?

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    Senior Member mrr23's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    After the tune, I would suggest switching back to the stock stat. You are gonna use so much gas with the low stat.
    Quote Originally Posted by 9t8z28 View Post
    I don't understand your statement?
    when you made your first statement, you didn't explain why, other than he's gonna use so much gas.

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