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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #1
I want to know if I should go with 190-180-170 or 160 degrees thermostat with a fully built n/a engine ? Does the ecu will had trouble under 180f ?

thank you
 

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Brokedick Millionaire
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40,237 Posts
ecu needs to see 168-170, start with the 180 and see how it goes.

You'll need a water temp gauge to monitor.
 

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Registered
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720 Posts
dont mean to thread jack, but i ordered a Gates Racing 170, is that a good middle ground for a high hp turbo y8?
 

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Brokedick Millionaire
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40,237 Posts
depends on the rest of your cooling system.

Once the Tstat is fully open, it don't matter from there. Thermal runaway if your system can't disipate the extra heat.

By going with a lower temp, you only gonna allow the water to start flowing to the radiator a little sooner, but if the system is not up to capacity it'll still overheat.

Then with the 170 you'll get crappy mileage in colder climate since the engine willl never get out of cold loop.

5-6 MPG better mileage by making the ECU happy with proper coolant temp. I know, I'm running a 170 FailSafe right now due to a weak HG. Last week it got up to 65 degrees and I didn't need heat, so ECU was finally happy.

380 miles, 10.5 gallons = 36.2 mpg

During the cold, 30-31 mpg.....which sucks
 

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Curious George
'99 LX Civic Sedan
Joined
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3,569 Posts
Discussion Starter #8
but stock one is 180 or 190 ?

I'm also running my car suring 'srping/summer/falls' ... we can get temperature near 0 Celsius and up to 35C.
 
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