September 21, 2020 1 min read

We get a lot of questions regarding how the SPE Low Temp, High Flow Thermostat works in hotter & colder climates (or during seasonal highs & lows). 

Below you see a graph showing the temperature (in °F) vs time. In this example you can see both the SPE Low Temp (blue) and OEM thermostat (red) reach 175° at around 6 minutes. At this time, the SPE Low Temp thermostat will open whereas the OEM thermostat will continue to climb until it reaches around 195° when it will open. 
How does a thermostat work graph

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.

 

Still have questions? We welcome you to send us an email at sales@spediesel.com. 


4 Responses

Steve Clauter
Steve Clauter

October 29, 2020

I asked my Ford Dealer about installing this thermostat and they thought it might void Ford’s warranty. Any thoughts on this? Thank you.

JOSH WILTSHIRE
JOSH WILTSHIRE

October 29, 2020

If these trucks benefit from running 20 degrees cooler, why did Ford not select that thermostat from the jump? Seems like you have to be giving up either performance, efficiency, or both. Yall make awesome stuff, I’m just on the fence about this one..

Gene Creech
Gene Creech

October 29, 2020

how much would this help a deleted daily driver

Kawika
Kawika

October 29, 2020

Works exactly as advertised. I live in Hawaii where we have hot climates along with steep grade highways. On a stock 6.7 t-stat I would get up to 200° water 210° oil temps on steep grades. With the spe t-stat on same grade I see 180° water 190° oil temps.

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