$35 shipped 160 degree thermostat - Subaru Forester Owners Forum
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post #1 of 8 (permalink) Old 06-13-2010, 11:59 PM Thread Starter
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$35 shipped 160 degree thermostat

160 degree thermostat from BFM as seen in Ebaymotors.

Subaru Impreza WRX STI Performance parts,BCS,Boost control Solenoids,Thermostats,Port and Polish Services,DIY guides
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post #2 of 8 (permalink) Old 06-14-2010, 04:03 AM
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These may not be a good idea in a modern engine, as a Subaru's OEM t-stat is set at ~195 F. Installing a 160 F model may result in poor fuel economy, emissions, driveability, and performance.

HTH,
Jim / crewzer

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post #3 of 8 (permalink) Old 06-14-2010, 06:24 PM
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Subaru OEM Thermostat are rated at 170 not 195. I always feel the heater are way too hot even in the middle of winter this might be a good solution for me. This would not make any performance difference. The only performance advantage is to reduce the change of detonation if you tune your engine very aggressively.
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post #4 of 8 (permalink) Old 06-14-2010, 08:31 PM
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yeap - 170* F. the very first thing i ever did to my subaru was install a 160* F crucial racing failsafe thermostat. three years later, i've never had any noticeable issues.

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post #5 of 8 (permalink) Old 06-14-2010, 08:38 PM
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^^Same here, I changed mine to the Crucial t-stat about 3 or 4 years ago after having had an overheating/heatsoak episode in triple digit temps. No problems ever since!

-Silke
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post #6 of 8 (permalink) Old 06-15-2010, 05:55 AM
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My N/A car engine's normal operating temp in the ~185 F - ~205 F range. Being somewhat "old school", this suggests to me that the thermostat spec would be ~195 F (90 C = 194 F).

I wasn't able to find a definitive single-number T-stat temp spec. However, the '07 Forester service manual section on the thermostat (see attached) provides the following info:

Quote:
Starting temperature to open:
Non-turbo model: 80 — 84C (176 — 183F)
Turbo model: 76 — 80C (169 — 176F)

Fully opens:
Non-turbo model: 95C (203F)
Turbo model: 91C (196F)
Frankly, I'm not quite sure how a thermostat temp spec is defined these days ("Start to open"? Between "start to open" and "fully open"?). If the spec is based on "start to open", then it looks to me like the reference '07 non-turbo / turbo t-stat specs are 180 F (82 C) / 172 F (78 C).

If the spec is based on something usefully in-between "start to open" and "fully open", then it looks to me like the reference '07 non-turbo / turbo specs are 194 F (90 C) / 185 F (85 C).

FWIW, I'd prefer this definition, as I'm used to a thermostat setting being a target value. However, I also appreciate that mechanical automotive thermostats can only react to coolant temperature, and don't really control it.

Based on the "start to open" definition above, the 160 may be OK in a turbo motor operated in generally warm-to-hot climates or conditions. However, I'd still caution against putting one into a current non-turbo motor, and using a 160 in a turbo motor in cold conditions may not be beneficial.

Regards,
Jim / crewzer
Attached Files
File Type: pdf MSA5T0721A161855 thermostat.pdf (63.0 KB, 105 views)

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Last edited by crewzer; 06-15-2010 at 06:42 AM.
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post #7 of 8 (permalink) Old 06-15-2010, 04:00 PM
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Originally Posted by crewzer View Post
However, I'd still caution against putting one into a current non-turbo motor, and using a 160 in a turbo motor in cold conditions may not be beneficial.

Regards,
Jim / crewzer
I tend to agree on very hot days and higher power levels the engine won't see much difference between the 160 and a higher temp one. Stats are mainly used at lower power conditions to keep emissions and engine efficiencies at optimal values. In other words higher temp is better on low load cooler temp conditions. I suspect engine deposits will be less with a higher temp stat. Turbo..might be an other matter.

Be careful what you wish for.
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post #8 of 8 (permalink) Old 06-15-2010, 04:17 PM
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The OEM NA T-stats are stamped 78C(172F) on the valve, this is the temp at which the valve will begin to open if you were to say heat it in a pot of water and watch it. Contrary to popular belief they do not "pop" open to a fully open state when this temp is reached. As the temp rises they will slowly open to a fully open state, which should relatively correspond to the fully open temp(203F for the NA).

His - 08 X Prem 5mt
Hers - 08 X 4EAT
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