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Mishimoto Racing Thermostat 154 Degree
Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
Features & Product Details
RallySport Direct is proud to provide you with a large catalog of quality automotive performance and cooling products brought to you by Mishimoto.
This is the Mishimoto Racing Thermostat, and the main purpose of this particular thermostat is to activate at a lower temperature so that the coolant flows through the system earlier. The result is improved cooling efficiency and is ideal for those of you who may live in a warmer climate, or who participate in high-performance driving conditions where the cooling system has to keep up with an engine that lives in the upper-RPM range.
DETAILS:
Specifications
PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED
REVIEWS & CUSTOMER MEDIA
Just got it in today and installed it. The car has not seen 184 yet. Which is what I use to run at. But I'm gonna go for a hard drive an see how it does but so far its excellent.
I bought it originally to replace a stock thermostat. During installation I noticed the currently installed Thermostat was also the 154 degree Mishimoto. I just thought maybe it was a bad one as I didn't know when it was installed. About 4 months later, My car began to overheat again. This time I installed an OEM thermostat. Not worth your time.
I bought the thermostat and installed into my car with a mishimoto radiator. Two days later the car began overheating and I stopped to let it cool off. Contemplating getting a tow i tried to drive it again and ended up being the thermostat was stuck . The product performed well but lasted a mere 2 days. I reccomend you stick with OEM as this could have cause engine failure in the ej25 motor with the increasing high temperatures, my car saw up to 245 degree coolant temp. I reccomend you do not buy this thermostat.
Bought this because i started a new job that requires me to drive my stage 2 bugeye 100 miles a day. The Xline radiator alone brought my temps down about 10 degrees from 195 to 185 and now with the thermostat im running about 20 degrees cooler at 165. I wasnt able to use the gasket thats included because i couldnt get it to seat properly so i had to re use the oem subaru gasket but its okay because i only put it in two months ago. Today it also threw the P0128 code on the way home so i might try and alter the water temp scaling. Great product overall i feel much more confident driving this thing 100 miles a day.
Recieved the product and was impressed how well packaged it was and how it was ready to install. Quick and easy install and works awesome. Car gets max 208* and when I am running it hard in boost, it runs down to 158*. Of course I installed it in the winter so others may experience it differently. I would recoomend this thermostat to anyone building a performance Subaru.
QUESTIONS & ANSWERS
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Q: PO128? bug eye bob 2 years ago
I was wondering if running this thermostat could throw a PO128 coolant code as the car wouldn't hit ideal running temps soon enough on a cold winter night or just a cold start
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A: Yes this can cause that code to be thrown, these arent recommended if you live in a cold climate or somewhere where freezing or below freezing temps are normal.
Tylo R @ RallySport DirectWas this answer helpful?
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Q: OEM vs Mishimoto Racing Terhmostat Chair3 years ago
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A: I have the same issue. I installed a CSF radiator and this thermostat and I keep getting the P0128 error code. I dont know if I should be concerned. Maybe the combo is working too well... I keep resetting my ECU to get rid of the code but it will pop up every few days... anyone else have any input? Do I need to be worried?
Hoang NguyenWas this answer helpful?
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Q: Temperature Jamesg3 years ago
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A: Yes, this thermostat will open earlier than stock. That said, a larger radiator, coolant additive such as Redline Water Wetter, and burping the cooling system would also be good steps to take.
Marcus E. @ RallySport Direct 2 years agoWas this answer helpful?
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Q: Mishimoto racing thermostat 154Degree correct use Henry 3 years ago
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A: It is not necessary to use an aftermarket thermostat with the Mishimoto radiator.
Jared A. @ RallySport Direct 3 years agoWas this answer helpful?
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Q: Big radiator with thermostat Henry 3 years ago
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A: Unfortunately, we would not be able to confirm fitment for JDM models
Devan M. @ RallySport Direct 3 years agoWas this answer helpful? -
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A: So the model in question is USDM EJ257 with big Mishimoto radiator, I want to know if use original thermostat has some problem or is totally necessary use Mishimoto racing thermostat 154Degree
Henry @Was this answer helpful?
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