Thermostat Calibration - Engine Temperature Optimization
Recalibrates the map-controlled thermostat for a lower, more performance-friendly running temperature.
Modern engines use a map-controlled electronic thermostat, and from the factory it targets a fairly high coolant temperature to favour emissions and fuel economy.
A higher running temperature reduces the density of the intake charge and adds heat soak under load, which can cost a little performance and place more thermal stress on the engine when it is worked hard.
Thermostat Calibration lowers and stabilises the target temperature, commonly by around 5-10 C, by editing the thermostat control map in the ECU. The engine then runs cooler and draws in denser air.
It suits performance-oriented driving and warm climates, and pairs well with Stage 1 or Stage 2 where the extra cooling headroom is useful. The change is specific to your ECU and is fully reversible to stock.
Advantages & Features
- Lower, controlled coolant temperature
- Denser intake charge
- Reduced heat soak under load
- Useful in warm climates
- Complements Stage 1 / Stage 2
- Fully reversible to stock
Related solutions
Price
Paid with credits from your account balance. The credit amount for your ECU is shown after the file is analysed, before you confirm. See credit packages
Frequently Asked Questions
What does thermostat calibration change?
On engines with a map-controlled thermostat the ECU decides when the thermostat opens. We lower the target so the engine runs cooler, which helps intake temperatures and knock resistance on tuned engines.
Which engines have a map-controlled thermostat?
Many VAG, BMW, Mercedes and Ford engines; if your car has a mechanical thermostat the ECU cannot change it. The analysis shows whether it applies to your file.
Which file do I need to upload?
A full read of the original ECU file. It is usually combined with Stage 1 or Stage 2.
How long does it take?
Typically 10-45 minutes when prepared by a tuner.
Is thermostat calibration reversible?
Yes, by flashing the original file back.
Does a cooler engine affect emissions or warm-up?
Warm-up is unchanged; only the fully-warm target drops a few degrees. Emission monitoring is not altered by this option.