Whats the best temperature for the thermostat to be set on? - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 02-27-2011, 08:20 PM Thread Starter
 
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Whats the best temperature for the thermostat to be set on?

I dont know if this is the right category. But I was wondering if i should change my thermostat temperature.. My friend changed his on his vette and made it a little cooler and it runs a bit smoother. Could the same be said for my 04 GTO? My fans kick on at 226.. is that normal? Could I get better performance by running it a little cooler???
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post #2 of 11 (permalink) Old 02-27-2011, 10:50 PM
 
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Leave the stock thermostat, tune the fans. Mine rarely goes above 197.
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post #3 of 11 (permalink) Old 02-27-2011, 10:57 PM
 
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Originally Posted by nikedo420 View Post
I dont know if this is the right category. But I was wondering if i should change my thermostat temperature.. My friend changed his on his vette and made it a little cooler and it runs a bit smoother. Could the same be said for my 04 GTO? My fans kick on at 226.. is that normal? Could I get better performance by running it a little cooler???
Yes, it reduces heat soak. To get full advantage of the cooler running thermostat is to lower the fan temps. Do a search we have covered this same subject before.
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post #4 of 11 (permalink) Old 02-28-2011, 02:06 AM Thread Starter
 
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:)

Cool thanks much
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post #5 of 11 (permalink) Old 02-28-2011, 08:56 AM
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I'd do what Dan said. Leave the stat and tune the fans. I've never seen any data that shows running the coolant a little lower does much of anything. If it did we'd be running 100* stats. It seems to be one of those "common knowledge" things that gets legs and runs

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post #6 of 11 (permalink) Old 02-28-2011, 02:34 PM
 
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Cool thanks much
Your best bet it to get a 160 thermostat if you ever see a 170 don't bother the stock thermostat is 186. I ran the stock for along time until I started modding I was told by my tuner who has been doing this for along time to run the 160.
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post #7 of 11 (permalink) Old 02-28-2011, 03:28 PM
 
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Leave the stat and tune the fans. I've never seen any data that shows running the coolant a little lower does much of anything. If it did we'd be running 100* stats. It seems to be one of those "common knowledge" things that gets legs and runs
With that said. Why even bother to lower the fan temps?
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post #8 of 11 (permalink) Old 03-01-2011, 07:13 PM
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With that said. Why even bother to lower the fan temps?
Because of water's boiling point and high heat's effect on warp-age and such. Other than "common knowledge" like your tuner professed I've never seen any data on benefit in longevity or performance. In fact running an engine too cool can be detrimental in the long haul. Oddly enough they engineer them to run in a fairly narrow range for peak efficiency

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post #9 of 11 (permalink) Old 03-01-2011, 08:21 PM
 
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Because of water's boiling point and high heat's effect on warp-age and such. Other than "common knowledge" like your tuner professed I've never seen any data on benefit in longevity or performance. In fact running an engine too cool can be detrimental in the long haul. Oddly enough they engineer them to run in a fairly narrow range for peak efficiency
Waters boiling point is higher because of antifreeze and pressure. Stock is not even close to cause damage. I don't think its common knowlage. Tuners don't make money off of thermostats. Besides I trust my tuners knowlage over anyone elses he has been doing this for many years. I never seen any data supporting being bad for an engine, running ~15 or so below stock operating temp. The advertised range on a t-stat is where it starts to open. I haven't seen data that supports both are claims so I'm not agreeing or disagreeing with you.
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post #10 of 11 (permalink) Old 03-01-2011, 09:26 PM
 
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Tune the fans to be close to tstat temp, because, why have a 20-30+ degree temperature swing? Consistency is probably the best. Like I said, the wildest swings on mine are between 189-197, a whole 8 degrees.

BTW, if you want control of the fans below 192, you need to flash a custom operating system to the PCM.
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