When thermostats are in the closed position heat increase over time is based on the engine’s physical ability to create the heat. Therefore, the time to reach a specific temperature does not change. For example, the factory thermostat and the SPE thermostat will reach 175° in the same amount of time. The only thing that affects the time to reach opening temp, is ambient temps which will affect both thermostats the same way. To summarize, the only thing that changes is the overall temperature, not how long it takes to get to that temperature.
**The high flow ability of the SPE thermostat has been engineered to help with how quickly it can cool and maintain temperature. This has no effect on how long it takes to get up to opening temperature since it's in the closed position up to that point.
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