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160 Thermostat?

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Old Oct 1, 2008 | 02:11 PM
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Default 160 Thermostat?

Okay, I have LT's, LS6 intake, and CAI. I just picked up an SC (Vortech) to install on my 99. I noticed a lot of people are running the 160 degree thermostat. What is the advantage of doing this? How about 180 degree? 160 seems a bit too cool... Carbon build up with a 160?

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Old Oct 1, 2008 | 02:58 PM
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the LS-x motor runs best at about 180 degrees, installing a 160 stat will help it run about 180.
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Old Oct 1, 2008 | 03:02 PM
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Old Oct 1, 2008 | 04:44 PM
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Is there a 180 available? Seems like that would be the best.
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Old Oct 1, 2008 | 04:58 PM
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Modify yours, you can adjust the temp to what works for you.

Link
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Old Oct 1, 2008 | 09:35 PM
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Originally Posted by DBLX
Is there a 180 available? Seems like that would be the best.
Yes - from Autozone.

I have it. Now the operating temps are completely dependent on outside air temps. (the stock radiator is the weak link)

At speed, cruising on the freeway, it varies from 189* when it's 55* outside to 205* when its over 100* outside.

To take advantage, I need to change the radiator.

On the track (damn hot day at 106*) the temps ran 238*

Mitch
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Old Oct 2, 2008 | 12:06 AM
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Originally Posted by DBLX
Is there a 180 available? Seems like that would be the best.
A 180*F stat will not lower the ECT from stock, even at highway speeds. A 160*F stat will keep the ECT at ~172*F-176*F at highway speeds.

Russ Kemp
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Old Oct 2, 2008 | 07:10 AM
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Originally Posted by DBLX
Is there a 180 available? Seems like that would be the best.
The stock thermostat is 187 degrees; so installing a 180 degree thermostat will make very little difference in engine coolant temperatures.
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Old Oct 2, 2008 | 07:39 AM
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Check my website - under simple C5 mods.

A 160 TStat with a manual fan control switch will give you the ability to keep the temps down at the track - even as you are waiting to get to the line on hotter days.

As stated about, the therm. temp is NOT the temp your car will run at during normal driving.
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Old Oct 2, 2008 | 08:11 AM
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Ok. So the stock thermostat is 187*? Then I agree switching to 180* is pointless. However, if I go to 160, should my temp stay 160*? Is the radiator just not that efficient?
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Old Oct 2, 2008 | 08:17 AM
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Originally Posted by DBLX
Ok. So the stock thermostat is 187*? Then I agree switching to 180* is pointless. However, if I go to 160, should my temp stay 160*? Is the radiator just not that efficient?
The stock TStat on my 1999 was a 192.

Anyway -- NO - the TStats temp is NOT that temp your car will run at. There are many factors.

changing the Tstat is one of the great Corvette hot topics.
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Old Oct 2, 2008 | 12:31 PM
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i switched my 99 c5 to a 160 after the cam swap and also changed my fans to come on at 180 instead of 220 and it seems to keep the care pretty cool added about 12 more horses
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Old Oct 2, 2008 | 01:12 PM
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I have a 160 thermo, and fans come on at 190. I normally run right at 190 to 194.
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Old Oct 2, 2008 | 04:44 PM
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I tried a German 160 this summer. In the kitchen, it began to pop open at 174, then when cooling down, it closed completely right about 160.
On the road in 95 degree temps, it would stabilize at about 174.
Of course, in town, it went on up and cycled within the fan on/off temps of 200-190.
I personally think 174 is a tad too cool for longterm use, and being concerned it would go even cooler during the winter, I replaced it with a modified stocker, which stabilizes about 183 in 90 degree weather.
What I would really love is for the car to run between 180-190 under all circumstances. But everyone has a pet temp.

DG
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Old Oct 2, 2008 | 10:45 PM
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Originally Posted by vettenuts
Modify yours, you can adjust the temp to what works for you.

Link
Excellant thread and it certainly falls in line with the OP's question. How did it turn out? Running temps? Oil temps?
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Old Oct 3, 2008 | 06:16 AM
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Originally Posted by tlc0706
Excellant thread and it certainly falls in line with the OP's question. How did it turn out? Running temps? Oil temps?
Unfortunately, shortly after writing that I had an accident and never got to work on the car. I am planning to start my installation next Monday night though.
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Old Oct 3, 2008 | 10:57 PM
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Good luck with the wrench turning Vettenuts. I just finished my AFR205 install, and made a quick 1st to 2nd pull last night. Even though I was pretty rich @ upper 11 AFR, it put a big smile on my face when it continued to burn the tires through 2nd gear. Anybody's butt dyno can feel that kind of difference over stock LS1 heads.
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Old Oct 4, 2008 | 08:27 AM
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Originally Posted by tlc0706
Excellant thread and it certainly falls in line with the OP's question. How did it turn out? Running temps? Oil temps?
Following vettenuts excellent writeup, I modified my factory 187 degree thermostat with a .100" shim.

On my stock LS1 engine, highway coolant temps. run between 182-186 degrees, and oil temps. run between 195-205 degrees.
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Old Oct 4, 2008 | 08:30 AM
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Originally Posted by Quicksilver Vert 01
Following vettenuts excellent writeup, I modified my factory 187 degree thermostat with a .100" shim.

On my stock LS1 engine, highway coolant temps. run between 182-186 degrees, and oil temps. run between 195-205 degrees.
Great, have you driven it recently now that temps are starting to drop?
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Old Oct 4, 2008 | 08:31 AM
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Originally Posted by chevy406
Good luck with the wrench turning Vettenuts. I just finished my AFR205 install, and made a quick 1st to 2nd pull last night. Even though I was pretty rich @ upper 11 AFR, it put a big smile on my face when it continued to burn the tires through 2nd gear. Anybody's butt dyno can feel that kind of difference over stock LS1 heads.
Thanks, have been working with Tony on this since last summer (2007) so I am anxious to get going.
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