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Old 04-01-2012, 09:35 AM   #1
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160 degree Tstat question

If I'm running a ud pulley would a 160 degree Tstat be worth puttin in? Next time I go to the dyno I'm going to have the fans programmed to come on sooner but I've heard this Tstat does nothing? Advice?
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Old 04-01-2012, 10:14 AM   #2
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I have been told by some top tuners not to use them as these engines are designed to run at the warmer temps, take that for what its worth.
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Old 04-01-2012, 10:16 AM   #3
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I've heard the same, it does nothing. What I've been told by mechanics is that its possible to be more of a problem than helpful.
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Old 04-01-2012, 11:15 AM   #4
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I've read to where the LS engines like the higher temps but I was curious with the ud pulley and slower water pump rotation would it put it back to the normal operation temps or be a headache. 2 for no and 1 lsx doc for yes. Other opinions?
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Old 04-01-2012, 11:25 AM   #5
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LOL, I put a 160 degree in ever LSx car I have ever owned and built, worth every penny! I've been working on these motors for about 13 years.

Motors running 'higher temps is good for emissions and that's it. Why do you think people let they cars cool off between runs at the track and get better times? Following you guys' logic you car should get faster the more it gets hot lapped and heat soaked.
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Old 04-01-2012, 11:48 AM   #6
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Quote:
Originally Posted by The LSX Dr. View Post
I have the same set up on my Silverado with no problems. With the combination of the underdrive pulley and lower temp t-stat it puts the engine in the optimum operating temp. Keep in mind there are variables on what the climate is where you live.

With a 160° T-stat the engine will typically run in the mid 180°s.
The stock T-stat is rated at 186°. The engine will run a bit over 200°. There is the ability to fine tune operating temperature with fan settings.
Told by all tuners aluminum engines run best 190-205 for best power,so yeah set fans to be on 185-200 or so as stat will run in that range anyway. My old ls1 ran right at 190(fan 1) and 200(fan 2). was good for 5 hp
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Old 04-01-2012, 02:17 PM   #7
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http://performanceunlimited.com/cobr...hermostat.html

Years ago I ran across the above link. Near the bottom of the page was the reason I've never ran a thermostat colder than 180 (stock on my Impala SS was 195). But my cars have always been high mileage daily drivers. Being in the mid west, during the winter, even the 180 wouldn't allow the cabin to get warm even after my 26 mile drive to work.
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Old 04-01-2012, 03:56 PM   #8
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I read your link and it makes a good arguement and I didnt consider this until I did the UD pulley and noticed it runs a lil bit warmer and its going to get real hot here in NC pretty soon. I figure for 30 bucks cant hurt.
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Old 04-01-2012, 04:00 PM   #9
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What about your ring gap? Aren't you running your rings at a larger gap at a lower temperature? Seems like a bad idea.

Alos, heat soak is more about the intake temps not the block temps, no?

Quote:
Originally Posted by SUX2BU View Post
LOL, I put a 160 degree in ever LSx car I have ever owned and built, worth every penny! I've been working on these motors for about 13 years.

Motors running 'higher temps is good for emissions and that's it. Why do you think people let they cars cool off between runs at the track and get better times? Following you guys' logic you car should get faster the more it gets hot lapped and heat soaked.
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Old 04-01-2012, 04:43 PM   #10
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What about your ring gap? Aren't you running your rings at a larger gap at a lower temperature? Seems like a bad idea.

Alos, heat soak is more about the intake temps not the block temps, no?
What most people don't understand is that you run a 160 degree thermostat so your car runs at 175-185 degrees.

A 160 degree thermostat

WILL NOT

make your car run at 160 degrees.

It means the thermostat is closed until 160 degrees. At 160 degrees the thermostat begins to slowly open and isn't fully open until about 185 degrees (put one in a pot of boiling water and watch it work, it's actually pretty cool).

The absolute coolest my car runs is maybe 177ish and the hottest it runs is about 186ish.

Quote:
Originally Posted by IndeedSS1 View Post
http://performanceunlimited.com/cobr...hermostat.html

Years ago I ran across the above link. Near the bottom of the page was the reason I've never ran a thermostat colder than 180 (stock on my Impala SS was 195). But my cars have always been high mileage daily drivers. Being in the mid west, during the winter, even the 180 wouldn't allow the cabin to get warm even after my 26 mile drive to work.
Reading that article it looks like even more of a reason to run a 160 degree thermostat. But then again, it also looks like they don't understand how a thermostat works.

Quote:
That "magic" number lies in the 175-180 degree range, which requires a 180 degree thermostat..The all too commonly used 160 degree thermostat is way too low to be considered for performance or engine longevity.
Like I said earlier a 160 degree will put you temps in the 175-185 degree range. Exactly where their graph says is the best.
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Old 04-01-2012, 04:48 PM   #11
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How can any tuner say that running an LS motor at 185* is bad? Lol

Thats rediculas!
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Old 04-01-2012, 04:54 PM   #12
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How can any tuner say that running an LS motor at 185* is bad? Lol

Thats rediculas!
Those must be some really good tuners!

My tuner puts a 160 degree thermostat in EVERY car. His personal 5th gen runs 9s in the 1/4 and he is shooting for mid 8s this year.
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Old 04-01-2012, 06:44 PM   #13
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Ok SUX2BU and LSX doc sold me. 160 tstat ordered. Thanks for all the opinions and such.
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Old 04-01-2012, 07:19 PM   #14
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