The factory thermostat on an RB-series or VG30 engine holds coolant temperature near 76.5 °C before it begins to open. Under sustained load or on track, that delay allows coolant temperature to climb and reduces power. The NISMO Low-Temperature Thermostat (part number 21200-RS580) opens at 62 °C so coolant starts circulating through the radiator earlier.
By moving coolant sooner, the NISMO unit slows the rise in water temperature that normally accompanies high-speed or circuit driving. NISMO designed the opening point to stay within the range where the engine’s cold-enrichment function still operates, helping maintain a richer mixture during the period when temperatures are still climbing. The result is more consistent power delivery and reduced heat-related power loss on both street and track.
The thermostat is a direct replacement for the factory unit on RB20DE/T, RB25DE/T, and RB26DETT engines found in R31 through R34 Skylines, as well as the matching VG20 and VG30 family engines used in the 300ZX and related models. It requires no modification to the housing or coolant system.
At Terra Firma Automotive we supply this genuine NISMO Low-Temperature Thermostat so owners of turbocharged and high-output Nissans can control coolant temperature without searching for discontinued or overpriced stock. Choose Terra Firma Automotive for authentic NISMO cooling components.
- Genuine NISMO Low-Temperature Thermostat
- Part Number: 21200-RS580
- Opening temperature: 62 °C (stock approximately 76.5 °C)
- Promotes earlier coolant circulation through the radiator
- Reduces power loss caused by rising coolant temperature under load or on track
- Helps maintain richer mixture during the period of rising temperature
- Direct replacement for factory thermostat
- Fits RB20DE/T, RB25DE/T, and RB26DETT
- Fits VG20E/T, VG30E/T, VG33E, and VG30DE/T/TT
- Compatible with R31–R34 Skyline, Stagea WC34, and 300ZX Z32
- Made in Japan
- Quantity required: 1 per engine
- No housing modification required
- Available from Terra Firma Automotive
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