Mishimoto MMTS-RX7-89 Low Temp Thermostat for 1989-1995 Mazda RX-7 13B

Vehicle Fitment

• 1989-1995 Mazda RX-7 (13B rotary engine)

Features

• Direct-fit low-temperature racing thermostat for Mazda RX-7 cooling system
• Opens at a lower temperature than the OEM thermostat for earlier coolant flow
• Improves cooling efficiency and reduces peak engine temperatures under load
• Ideal for turbocharged and high-performance rotary applications
• Designed to help reduce heat soak in spirited driving and track use
• Precision calibrated at approximately 154.4 °F (68 °C) activation
• Durable construction for reliable long-term operation
• Backed by Mishimoto Lifetime Warranty

Specifications

• Part Number: MMTS-RX7-89
• Thermostat Activation Temperature: ~154.4 °F (68 °C)
• OEM Activation Temperature: ~180 °F (82 °C)
• Engine Compatibility: Mazda 13B rotary
• Fitment Years: 1989-1995
• Fitment Position: Thermostat housing (direct replacement)
• Application: Improved coolant flow timing for enhanced thermal management

Included Components

• 1x Mishimoto low-temperature racing thermostat (MMTS-RX7-89)
• 1x Mishimoto Lifetime Warranty documentation

Product Description

The Mishimoto MMTS-RX7-89 Low Temperature Thermostat is engineered specifically for the Mazda RX-7 rotary engine chassis from 1989 through 1995. Compared to the stock thermostat, this performance unit opens at around 154.4 °F (68 °C), allowing coolant to begin circulating earlier in the warm-up cycle. This helps reduce and maintain lower engine operating temperatures during spirited driving, hot ambient conditions, or performance modifications. Lower thermal load can assist with improved reliability and reduced heat soak for turbocharged or high-output setups.

Installation is straightforward, as this thermostat is a direct replacement for the OEM unit and fits into the standard housing without modification. Built with consistent calibration, quality materials, and backed by Mishimoto's Lifetime Warranty, the MMTS-RX7-89 is a solid cooling upgrade for RX-7 enthusiasts seeking better thermal control for daily driving, road course sessions, or spirited street use.