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Old 06-15-2001, 04:41 PM   #1
Scooby Specialist
Member#: 3773
Join Date: Jan 2001
2002 WRX Sedan
2006 Outback 3.0R

Post 180 deg. thermostat

I know it is common practice to switch to a lower temp. thermostat for performance reasons and while I know many of the German and American car owners do it I don't recall hearing it mentioned in these forums.
Is there a reason why I shouldn't do it? Who sells them?
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Old 06-15-2001, 05:33 PM   #2
Scooby Specialist
Member#: 4520
Join Date: Feb 2001
Location: LAS VEGAS
93 STi V.4 RA


If your car runs cold you can build up carbon deposits in your combustion chambers alot quicker, and you will defineitly loose gas milage.......your tail pipe emissions will suffer too.
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Old 06-15-2001, 05:52 PM   #3
Jan Shim
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Member#: 6366
Join Date: May 2001
Location: Brunei Darussalam
1998 WRX Wagon (Ret)


If the US spec WRX shares the same thermostat as Japanese/Euro/Aus spec WRX, the thermostat opens at 76C (169F). When temps reach 96C (205F) fan kicks when vehicle speed exceeds 19kph/12mph.

A 82C(180F) thermostat will delay the opening 6c later which is no big deal really. I have an ARC (Abbey Road Company) 68C (154F) thermostat that I am going to fit as soon as I get my hands on a bottle of RedLine WaterWetter and 7 litres of distilled water.
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Old 06-18-2001, 07:52 PM   #4
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Member#: 3773
Join Date: Jan 2001
2002 WRX Sedan
2006 Outback 3.0R


I guess the theory is that if the coolant is running cooler (180 deg rather than 210 deg, or whatever) then the head temps would be slightly lower and should result in less chance of detonation.
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Old 06-19-2001, 07:29 AM   #5
Scooby Newbie
Member#: 1031
Join Date: Mar 2000
Location: PA, USA
2002 WRX

Default Is it true?

OK here is what has happened here in the states with "other" cars... The ECU monitors engine temp. when its not up to "operating temp" the ECU assums that the engine has just started and is warming up, thus running a richer mixture. People here have put in a coolder thermostat and caused poor running, clogged catts/O2 sensors, poor milage, etc... Keep an eye on this "possible" problem. Please post if you have a problem with running cooler temps........................
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