High-Flow Engine & Transmission Oil Cooler Thermostat

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100% of 100

As low as $199.00

Part #
FSM Configurator

Free shipping on USA orders over $99

  • Improved Racing's Flow Series Motor Sport (FSM) oil thermostat is a universal solution that can be used with any oil cooler on any vehicle or industrial application flowing up to 20 GPM (75.71 LPM).
  • Trusted by professional race teams, OEM's, and military contractors.
  • Accelerates fluid warmup time and maintains a minimum fluid temperature.
  • Patented high-flow design with no valves, springs, or other obstructions in the primary oil flow.
  • Features -10AN female O-ring boss ports. Optional adapter fittings available in various sizes.
  • Lifetime warranty. Made in the USA.

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Part # FSM Configurator
Customize High-Flow Engine & Transmission Oil Cooler Thermostat
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High-Flow Engine & Transmission Oil Cooler Thermostat
High-Flow Engine & Transmission Oil Cooler Thermostat

In stock

Free shipping on USA orders over $99

$199.00

Summary

    Improved Racing's Flow Series Motor Sport (FSM) oil thermostat is a high-performance, high-flow, universal fluid temperature control solution that can be used with any oil cooler on any vehicle or industrial application flowing up to 20 GPM (75.71 LPM).

    The patented internal design (US patent 9,772,632) minimizes the pressure drop by strategically locating the bypass valve mechanism completely out of the primary fluid flow. This design is ideal for demanding applications that require low flow restriction in a compact and lightweight design.

    Many professional racing teams, supercar manufacturers, and military contractors rely on Improved Racing's thermostats for the advantages they provide in competition and in critical operating environments. Our professional engineering team has experience customizing thermostats and supporting a mulitude of custom applications. Please inquire if you need a customization to support your application.

    Improved Racing maintains exceptionally high quality-control standards. Every single Improved Racing thermostat undergoes rigurous inspection, functional testing, and certification before it leaves our doors. We manufacture them in the USA to the strictest standards and back them with a lifetime warranty – your guarantee of lasting performance and peace of mind.

    The FSM thermostat features female -10AN O-ring boss threads and is available with optional fittings in 3/8" or 1/2'' hose barb or AN fittings in -6AN, -8AN, -10AN, or -12AN. The included brackets allow for multiple mounting options.

    Why Use an Oil Thermostat?

    High performance vehicles require large oil coolers to ensure that the oil does not overheat during strenuous use. These coolers also introduce the danger of over-cooling the oil and delaying engine warm-up, resulting in horsepower loss, excessive engine wear and reduced gas mileage. Oil thermostats perform the critical function of bypassing the oil cooler until the oil has reached its minimum operating temperature.

    Operation

    Improved Racing FSM Inline Thermostat Flow Diagram

    Features and Benefits

    • Reduces excessive engine wear and horsepower losses while improving gas mileage by preventing oil temperatures from dropping below optimal levels.
    • Maintains a minimum fluid temperature according to the typical stabilization temp in the table below, +/- 2°F (+/- 1°C).
    • Patented, high flow, low pressure drop design locates the valve assembly completely out of the primary fluid flow.
    • Allows a small percentage (less than 10%) of fluid to continually circulate through the cooler to eliminate air pockets and prevent cold fluid trapped in the cooler from shocking the system.
    • Thermostat can never fail in such a way that fluid flow is blocked.
    • Rebuildable.
    • 6061-T6 billet aluminum construction with black MIL-A-8625 Type II anodized finish.
    • Lightweight at just 12.7 ounces (360g) without brackets or fittings.
    • Supersedes part numbers ENV-100 and EUN-1000.

    Temperature Rating Specifications

    Part Number Typical Stabilization Temp Activation Temp Full Flow Temp Recommended Application
    FSM-135 135ºF (57ºC) 131ºF (55ºC) 153ºF (67ºC) Trans, Diff, PS Fluid
    FSM-145 145ºF (63ºC) 140ºF (60ºC) 163ºF (73ºC) Trans, Diff, PS Fluid
    FSM-165 165ºF (74ºC) 160ºF (71ºC) 181ºF (83ºC) Trans, Diff, PS Fluid
    FSM-185 185ºF (85ºC) 180ºF (82ºC) 203ºF (95ºC) Engine Oil (Street & Strip)
    FSM-205 205ºF (96ºC) 200ºF (93ºC) 221ºF (105ºC) Engine Oil (Street & Strip)
    FSM-215 215ºF (102ºC) 212ºF (100ºC) 233ºF (112ºC) Engine Oil (Road Racing)




    Unrestricted oil flow through Improved Racing high-flow in-line thermostat

    Valve assembly is housed completely between the two ports. No valves, springs, or thermal motor interrupting the primary oil flow!



    Improved Racing FSM Thermostat Dimensions
    Compact dimensions (shown in inches)



    Improved Racing FSM Thermostat mounting bracket configuration options
    Brackets allow for multiple mounting configurations



    Adapter fittings available for FSM thermostat
    Available with 3/8" or 1/2'' hose barb fittings or AN fittings in -6AN, -8AN, -10AN, or -12AN

    Applications

    • Engine, transmission, differential, and industrial fluid cooling applications flowing up to 20 GPM (75.71 LPM).
    • Passenger car automotive, marine, and experimental aircraft engine oil cooling systems.
    • Automotive and truck power steering fluid cooling systems.
    • Diesel and gas truck transmission fluid cooling systems.
    • Diesel and gas truck differential and transfer case fluid cooling systems.
    • Not for use with corrosive fluids. If used with water, a distilled water solution with a lubricant such as ethylene glycol must be used.

    Includes

    • 1x Remote thermostat block.
    • 2x Zinc-plated steel mounting brackets and screws.
    Specifications
    Part #
    FSM Configurator
    Brand
    Improved Racing
    Part Weight
    12.7 oz (360g)
    Primary Material
    6061-T6 aluminum
    Finish
    Type II Anodized
    Color
    Black
    Minimum Operating Temperature
    -40°F (-40°C)
    Maximum Operating Temperature
    302°F (150°C)
    Inlet Port Size
    -10AN O-Ring Boss Female
    Outlet Port Size
    -10AN O-Ring Boss Female
    Maximum Operating Pressure
    300 psi (20.68 bar)
    Max Recommended Flow Rate
    Up to 20 GPM (76 LPM)
    Fluid Compatibility
    Coolants
    Engine oil
    Power Steering Fluid
    Transmission fluid
    Instruction Manuals
    FSM inline fluid thermostat, all temperatures
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