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Old 02-07-2014, 01:40 AM   #1
white guys wrx
Scooby Specialist
Member#: 223316
Join Date: Sep 2009
Chapter/Region: MWSOC
Location: MO
2005 STi
& 02 WRX

At the Track mishimoto racing thermostat?

After many hours of reading reviews on mishimoto's oil cooler and other random bits of information I see a fellow leave a review on their Thermostats for his STI. He claimed that he has the Mishi radiator (i have, no noticeable temp drops) the Racing Thermostat cut his temps in half of what they normally operate at???? Is this true? If so.. Would that be harmful to the engine?

<~~ his review

the below is what mishi claims on their website.. I dont know what is true? Cut in half is a lot larger than 8.5

Mishimoto Thermostat Activates at 68 C

OEM Thermostat Activates at 76.5 C

ebay claims Will open up at 60C vs stock 76.5C
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Last edited by white guys wrx; 02-07-2014 at 01:46 AM.
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Old 02-07-2014, 06:28 AM   #2
Big Ron
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
me b4 j00 buy



Always remember to read the sticky threads. If the Mishimoto coolant thermostat does open at 68, that is dangerous and should not be used. There is very little headroom in coolant temperature and while running a cooler thermostat is fine, when you try to apply logic of colder is better, that leads you down a bad road as there must be heat in the engine to run efficiently both for oil and coolant temperature.
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Old 02-07-2014, 06:39 AM   #3
Medium Frank
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
2014 Porsche
GT3 (Currently on Fire)


What if we told you that your car operates better at a warmer temp? And that you in no way need a thermostat/radiator combo that will cut operating temp's in half?
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Old 02-07-2014, 06:48 AM   #4
Scooby Guru
Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
1994 Legacy
"The Silver Slug"


I'd then put a resistor where your coolant temperature sensor sits and ****.

None of this cold running rich AFR bull****.
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