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Low temp thermostats?

This is a discussion on Low temp thermostats? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by pajeff02 Isn't the open loop to closed loop factory set around 140 degrees? Closed loop enable is ...

  1. #21
    Moderator Cutlass's Avatar
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    Quote Originally Posted by pajeff02 View Post
    Isn't the open loop to closed loop factory set around 140 degrees?
    Closed loop enable is actually 92*F unless the intake air temp is -4*F or colder, than its 140*F.
    So...yeah...I'm not really sure what warm-up mode 160 stat affects here?
    Last edited by Cutlass; 07-04-2010 at 04:45 AM.

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    Quote Originally Posted by Cutlass View Post
    Closed loop enable is actually 92*F unless the intake air temp is -4*F or colder, than its 140*F.
    So...yeah...I'm not really sure what warm-up mode 160 stat affects here?

    I had 140 in my head for some reason. Didn't realize it kicked over that low -- good info to have. Thanks!

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    Senior Member tatertot91's Avatar
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    180 Should be fine

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by pajeff02 View Post
    I had 140 in my head for some reason. Didn't realize it kicked over that low -- good info to have. Thanks!
    yeah I didn't really realize it was that low either. I just opened up HPTuners and looked it up in in the factory tune file for my 99 WS6.
    Its under Engine>Fuel Control>OL & CL> Closed Loop Enable ECT vs. IAT

  5. #25
    Moderator Firebirdjones's Avatar
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    Just get the 160. You'll find that all the LS1 stats are limited by design anyway and don't actually operate at the advertised 160 temp. They actually don't crack open until around 170-173 degrees anyway. They are fully open around 176 degrees. So the cars will run in the mid 170's to about 180 degrees most all the time with the 160 stat.

    You really need to log the car and see where the temps fall at a steady cruise and while in traffic. Then you can program the fans accordingly.

    I found (with my 160 stat) on a cool day and a steady cruise without the fans on the motor would fluctuate between 174-176 degrees. On a warmer day (say 80 degrees or more) it would fluctuate at 178 to 182 on a steady cruise.
    So I found programming the 1st fan to come on at 185 and the second fan to come on at 190 degrees, and shutting them both off at 180 degrees seemed to work well enough, and it's not killing the fans running them all the time. Once at a steady cruise the car runs cool enough to keep the fans off.

    There is also a setting in there to run the fans after the engine is shut off for up to 2 minutes if I remember correctly. I have both of my cars set to run when the temp is 200 degrees. So I can tell if the engine is running a tad warm if the fans are still running after I shut the car down. I usually only notice this on the hottest of days (95+) when I'm blasting the A/C, and idling around in a parking lot for an extended period before shutting it off.
    Last edited by Firebirdjones; 07-04-2010 at 08:10 AM.

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    Quote Originally Posted by Cutlass View Post
    yeah I didn't really realize it was that low either. I just opened up HPTuners and looked it up in in the factory tune file for my 99 WS6.
    Its under Engine>Fuel Control>OL & CL> Closed Loop Enable ECT vs. IAT

    Just found it as well. I did a read on my latest tune from Frost and saved an extra copy that I can play with. It's exactly the same as what you posted.

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    Be carefull,,,even if you know of others in your area that run a 160.,,,your driving style on start up and age of the motor (or wear of the rings that is) can cause you to be sad one day when that 160 install caused you problems down the road..

    One should ask themselves is the HP gain (after programming for the new thermostat) worth the money and or sacrifice of engine long term logistics,,,as in would a 160 vs 180 truly be worth it,,,or would a 180 and programming be the safer manner,,,

    I am going with 160 since I already bought it and installed it,,but if I had it to do over again it would be a 180...
    Dont forget that the rings seat best when its at a proper temperture,,,and that if the rings dont seal great you loose pressure and blow by is much greater,,,so at least I hear,,

    I could be totally wrong with all I said,,,after all,I have friends that voted for that idiot obama,,,,

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    cant think of any HARM that would come from a 160 stat.........anyone???

  10. #30
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    Quote Originally Posted by sjsingle1 View Post
    cant think of any HARM that would come from a 160 stat.........anyone???
    Nope, like I said,,,since these LS1 stats operate at 172-175 degrees anyway there isn't much difference between that and say,,,,a 180 stat. I run the 160's in both of our 4th gens, have been for years.

    But for the record,,,I've been running 160 stats (that actually work at 160) in all my other vehicles, many of which went through Ohio winters. Chevelle motor has been together like that for over 12 years with alot of racing, no ring sealing problems with that motor. I've been waiting for the day the short block shows signs of wear so I can build the one I want, but it isn't even hinting at giving up yet.
    70 formula has had the 160 since 1999 and it's still going strong. Ventura has had a 160 in it since 1985, still kicking fine. My 79 454 pickup that I use to pull a 10,000 lbs. trailer has always had a 160 in it,,,,with 102,000 miles on the clock now and runs like a top.
    I have others as well but you get the idea. I've never had issues running 160 stats in anything.

  11. #31
    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by rajiv1998 View Post
    Overcool? How? I didnt know 20-30 degrees below could cause a problem. I can see it doing damage in the winter maybe, but didnt know the engine could be damaged if its a few degrees below operating temp.
    The PCM will read that the engine is not at normal operating temperature, and your A/F ratio will be rich until it reaches operating temperature. The problem with using a 160F is that the PCM never reads the engine as normal operating temperature.

    I would also go with a 180F, that is what I am running in my vehicle.

    I believe most supercharged engines run a 160F.

    SteveC

  12. #32
    Moderator Firebirdjones's Avatar
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    The 160 stat won't affect fueling at all. These cars are programmed in the factory tune to go into closed loop at somewhere around 100 degrees. After that all fueling is controlled through the 02 sensors at part throttle.

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    old timer blue02Z's Avatar
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    So many wives tales in here hahaha! 160* is fine to run. Firebirdjones states the truth that they really arent 160* anyway.

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    Quote Originally Posted by blue02Z View Post
    So many wives tales in here hahaha! 160* is fine to run. Firebirdjones states the truth that they really arent 160* anyway.
    x2, I verified everything firebirdjones said on my own car with my scantool. The 160's run at about 180 anyway so no way it is "too cold".

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    free 160 stats for eveyone

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