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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 08-04-2009, 04:23 PM   #1
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160 Thermostat

Is their any tuning required for a cooler Thermostat? Any idea how would a stock PCM would respond? Thanks.
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Old 08-04-2009, 09:55 PM   #2
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You can do it, I did it in my 06 Vett. The coolant temps jump a lot more because the fans aren't programed correct. Going down the freeway, my temps would be 170, then in stop and go traffic it would be at the stock 210. Program the fans and it would run 170 all the time.

The thermostat helps A LOT though, atleast on my LS2 Vett. Business partner and I had identical cars running identical times at the drag strip. We did a top speed run(on airport runway) and our cars pulled dead even from 40-130. Then from 130-160 my car pulled 3 cars on him, it was like I sprayed the car. The only thing we can think is my car stayed cool on the big end where his just didn't. So you can figure, when we started the run my car was at 170ish and he was already at 200/210.
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Old 08-04-2009, 10:49 PM   #3
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I would advise against it for a stock HP motor. Leave it stock temp.
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Old 08-04-2009, 10:58 PM   #4
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just tune the fans to come on sooner
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Old 08-04-2009, 11:15 PM   #5
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like theFett said, you can do it. tho while you are at a standstill, your temps will still climb to 210 until your fans come on. while you are moving it will keep you cooler tho.
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Old 08-04-2009, 11:20 PM   #6
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I did it to my car...

You can certainly do it...but for the full benefit you need to adjust your fans either with a tune, or a handheld programmer. I sell both!

It will not cause negative effects if it is not tuned...you will just get better results if you do adjust for it!
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Old 08-04-2009, 11:26 PM   #7
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The fans on the camaro come on at 190 this car dos not get passed 210, In this part of AZ the temp is 110+ this time of the year.
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Old 08-04-2009, 11:33 PM   #8
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a colder stat doesnt really help you once your heatsoaked to death.
my ls1 eventually ran 190 in summer with a 160. i expect the camaro to be no different.
i say tune and 160 and a blower! ask zz for his shizzaZZLE.
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Old 08-05-2009, 03:00 AM   #9
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Not only that if your engine blows and they find that t-stat you could be in for a nice bill because it voids the warranty. Guess how much Crate LS3 or L99 is, installed?

Lot more than a thermostat costs.
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Old 08-05-2009, 03:51 AM   #10
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I would adjust the fans to come on sooner if you are worried about it. Even with a colder thermostat the car will still heat up to the factory temps because the fans are adjusted to come on at a certain temp.


If you combined the thermostat and fan tuning, you will have lower overall temps.
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Old 08-05-2009, 01:56 PM   #11
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Just like everyone else said, ECM must be reprogrammed, to take full benifit of the lower thermostat. I added a 160 after my tuner told me to put one in because of the 100+ temps during the summer months. Don't harm the car during the winter.
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Old 08-05-2009, 03:55 PM   #12
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Great info, Thanks!
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Old 08-05-2009, 07:55 PM   #13
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This question will forever be a debate of preference. I personally am in the group for a cooler running engine. My reason however is not for the obvious heat soak/performance line. I look at it in the long term. When you can reduce operating temperatures for years,you will without a doubt extend the life of the pump. This is a fact that cannot be refuted. Period.
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Old 08-05-2009, 07:59 PM   #14
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Wouldn't a non-GM reflash kill your warranty faster than a cooler thermostat?
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Old 08-05-2009, 08:10 PM   #15
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All you are changing when you do the 160 is when the fan comes on and off. Nothing else.
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Old 08-05-2009, 08:13 PM   #16
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Wouldn't a non-GM reflash kill your warranty faster than a cooler thermostat?
yes.
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Old 08-06-2009, 10:37 PM   #17
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I would adjust the fans to come on sooner if you are worried about it. Even with a colder thermostat the car will still heat up to the factory temps because the fans are adjusted to come on at a certain temp.


If you combined the thermostat and fan tuning, you will have lower overall temps.
Just a FYI about fan settings. My L99 low fan is programmed from the factory to come on at 221 and off at 210 degrees. Hi fan comes on at 228 degrees and off at 217 per EFILive. The A/C will also turn on the fans usually quicker with high hi-side pressures a lot of the time. A 160 thermostat should have the temp settings reprogrammed to work correctly.
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Old 08-06-2009, 10:58 PM   #18
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Just a FYI about fan settings. My L99 low fan is programmed from the factory to come on at 221 and off at 210 degrees. Hi fan comes on at 228 degrees and off at 217 per EFILive. The A/C will also turn on the fans usually quicker with high hi-side pressures a lot of the time. A 160 thermostat should have the temp settings reprogrammed to work correctly.
to work more efficiently. the t-stat will still work the same whether you have the fans turned on sooner or not.
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Old 08-07-2009, 10:52 AM   #19
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to work more efficiently. the t-stat will still work the same whether you have the fans turned on sooner or not.
That is a better choice of words. The thermostat will work the same but the coolant temp should be cooler with lower fan temp settings.
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