ISR Performance 68 Degree VQ35DE Thermostat - Nissan 350Z

Drop operating temperatures on a non HR VQ35DE with the ISR Performance 68 degree thermostat for the Nissan 350Z and Infiniti G35. It opens at 68 degrees Celsius compared with the factory 78 degrees, which lets coolant flow sooner and helps keep heat from building during spirited driving. This is the thermostat without water port for the VQ35DE.

What it changes

• Opening point of 68 degrees C versus 78 degrees C stock
• Coolant circulates through the engine earlier once warmed up
• Lower and more consistent engine temperatures under load

Who should run it

A colder thermostat is a sensible upgrade for high performance VQ35DE builds, cars driven in hot climates, or any 350Z or G35 that sees track time. It does not replace a proper radiator or oil cooler, but it is an inexpensive step that works alongside them.

Fitment

• Nissan 350Z with the VQ35DE (non HR)
• Infiniti G35 with the VQ35DE (non HR)

HR engines use a different thermostat; see the ISR VQ35HR and VQ37VHR version for those. Install with a new gasket and bleed the system fully to avoid air pockets.

All ISR Performance products are designed for off-road use only.

Legal in California only for racing vehicles which may never be used, or registered or licensed for use, upon a highway.