Reische Performance Thermostat 170 Degree Performance GT 1996-2004/2007-2010/F-150 Raptor 2010-2014

Reische Performance:
Reische Performance Thermostat 170 Degree Performance GT 1996-2004/2007-2010/F-150 Raptor 2010-2014 is rated 5.0 out of 5 by 3.
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  • 170 Degree Thermostat
  • For Modular Motors
  • Includes Rubber Gasket
  • Includes Rubber Gasket

Reische Performance 170 Degree Performance Thermostat for all 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009 and 2010 GT Mustangs and all 2010, 2011, 2012, 2013 and 2014 F150 Raptors.

Keep your GT Mustang or F150 Raptor's engine at an optimum running temperature with help from Reische Performance and their 170 degree performance thermostat! This American made, modified premium thermostat has a larger heat motor/spring assembly for more precise temperature control along with a heavy gauge chrome plated steel housing. This is a direct-fit replacement for your original or aftermarket-stock thermostat.

- 1996-2004 4.6L SOHC GT Mustangs
- 2007-2010 4.6L 3V SOHC GT Mustangs
- 2010 5.4L SOHC F150 Raptor
- 2010-2014 6.2L SOHC F150 Raptors

Additional Fitments:
1999-2004 5.4L S/C SVT Lightning F150
- 1997-2010 4.6/5.4L SOHC F150
- 1992-2011 4.6L SOHC Crown Victoria

Whether you are using an aftermarket radiator or not, this performance thermostat will provide the best possible heat dissipation from your setup along with a faster warm up time and better cold weather performance than a 160 degree unit or a thermostat with holes drilled in the diaphragm. Reische believes the 170 degree opening temperature is the ideal balance for high performance engines, providing high flow to your radiator by mid-180 temperatures while still providing good all season performance. With proper fan settings your coolant temperatures in cool weather will be in the 170s and in hot weather the 180s, giving those running high levels of timing and/or boost added protection against engine-damaging detonation as well as maximum power output.

Will I benefit from a low temperature thermostat?

A lot of people ask this question and the short answer is, probably. Typically, Reische does not recommend one if your engine is still running on the stock tuning; simply because a cooler engine does not necessarily make more horsepower. Sure, you may lose a few degrees of incoming air temperature and see some small gains, but primarily you should think of lower coolant temperatures as protection against engine-damaging detonation. Remember the knocking sound you heard when trying to accelerate an overheating vehicle? That is detonation and this can quickly destroy a high horsepower engine being pushed to maximum performance. Aside from possibly saving your engine there are a couple ways that a low temp thermostat can actually help make more power.

An engine at 185 degrees can run more timing advance safely than one running at 205 degrees, so tuning, along with a low temp thermostat, can make some significant gains. If you're using a handheld programmer, chip or custom tune then yes, it is definitely recommended to use a Reische Performance 170 degree thermostat. Running an engine cooler has been an A-B-C of high performance since the early days of hot rodding, ask your dad or grandfather. Those guys were pulling their thermostats out or drilling holes in them because they knew they could run more timing by doing so.

What are the possible negative effects of a low temperature thermostat?

If the engine does not reach a high enough temperature for the computer to leave warm-up mode then fuel economy will drop dramatically. This is the reason Reische does not produce or recommend for street use: 160 degree thermostats, running no thermostat at all or drilling holes in a thermostat. However, in all the time Reische has been producing their 170 degree performance thermostats, there has not been one complaint of anyone losing fuel economy. Reische thoroughly believes 170 degrees is the best balance overall.

Another concern is oil temperature and viscosity. If the engine oil does not get hot enough to burn off certain contaminants then the oil's effective life will be reduced. Lab testing has not shown any significant contaminant increases using a Reische 170 degree thermostat in cold weather, but to be safe, Reische recommends changing your oil more frequently if you plan to operate your vehicle regularly in cold climates. Also, effective oil viscosity is increased with lower temperatures so it is recommended to use a quality 0W-30 (or 5W-30) synthetic oil for most late model applications. In extreme cold environments it may be best to run an OEM temperature thermostat, but above all just monitor your coolant temperature carefully when you have concerns. If you observe sustained engine coolant temps below 165 degrees then it is recommended to swap the OEM thermostat back in for the colder months.

*Not for use on 2005-2006 GT Mustangs; please use RT4D.

Please Note: This Reische Performance thermostat ships with a new o-ring and fan setting recommendations for popular handheld tuners.

Tech Tips: Thermostats tend to have faulty operation or stick after years of service. Replace the thermostat during regular tune-ups to keep everything working properly. Adding new coolant with the thermostat will help keep your engine running at its proper operating temperature.

Beware of aftermarket companies who sell the same universal thermostat for all Ford engines. Reische Performance thermostats are the only ones designed to precisely fit each application, making them the best performing low temperature thermostats on the market. Order your 1996-2004/2007-2010 GT Mustang and 2010-2014 F150 Raptor Reische Performance 170 Degree Performance Thermostat from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Vehicle Fitment

This product will fit the following Mustang years:

Rated 5 out of 5 by from 170 thermostat I put this thermostat on my ford e350 5.4 it keeps temp at 180-183. Before was 195 with stock that was 192 all goodn hank you..
Date published: 2016-04-25
Rated 5 out of 5 by from Thermostat Great product works as advertised and super easy install
Date published: 2017-12-27
Rated 5 out of 5 by from Perfect drop-in replacement The 170F works as advertised, better than 180, not going to cause problems like a 160F. I installed this in my 07 GT, and just a word to the wise, 07-10 GT's use a different thermostat location from 05-06. The 07-10 3V t-stat is located UNDERNEATH the intake manifold. You need to remove the belt and alternator in order to use a wrench on the innermost bolt to loosen it so the housing can slide out. There's no way to torque it properly, just rely on hand torque. Doing my own boiling water test, the T-stat is pretty much fully open around 180F. You can opt to change your fan settings to take advantage of the cooler temps, or not. I found that in cooler ambient temperatures (60F or below), the cooling system naturally wants to hang around 184-194F without the use of the fan during normal driving (freeway/local with adequate airflow). So targeting 190F with the fan settings is a good way to go. If you follow the included settings, your fan will run all the time which might be great for the track, but not necessary on the street. In the summer with the 190F fan setting, I only hear the fan after long trips, using the A/C obviously, and when I'm driving it fairly hard. If it is a cool summer night and I'm cruising, the fan won't necessarily run. I run the 4S on the GT and the 4D on my 2014 Taurus SHO EcoBoost, and in the winter time the Taurus SHO coolant temps stay around the high 170s to low 180s during coasting. I can even see the temperature bar graph on the dash drop down if I coast longer than 5 seconds. I never noticed any improvement/impact on fuel economy, knock, or performance. I found I could set the fan to maintain about 200F with the stock 192F t-stat, so you're realistically looking at a drop of 10F with this 170F t-stat if you ran custom fan settings with the stock t-stat. After much experimentation, I'll tell you that on the EcoBoost and newer Fords, just set desired ECT to 190F, and re-scale the ECT vs Fan Speed table so the top columns are reduced by 22F (the difference between 170 and 192 t-stat ratings). Don't touch the A/C or Trans tables. I did at one point and it caused my fan to keep running all the time for some odd reason. Bottom line: Not mandatory, harder to install on 07-10 GT's, offers about a 10F drop in ECT (or 20F if you want to run the fan all the time).
Date published: 2017-09-15
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