GR Yaris (Gen 1 and 2) MAP Sensor Cooling Duct + Heat Shield Kit (G16E-GTS, 2020+)
GR Yaris (Gen 1 and 2) MAP Sensor Cooling Duct + Heat Shield Kit (G16E-GTS, 2020+)
Fight heat soak from both sides
Every other MAP sensor cooling duct we have seen addresses half the problem. It blows ambient air at the sensor, but the sensor keeps absorbing radiant heat from the hot pipe directly behind it. This kit attacks it from both directions:
- Cooling duct – channels fresh air from the bumper opening directly onto the MAP sensor.
- Radiant heat shield – blocks infrared heat from the hot pipe behind the sensor.
Lower, more stable sensor temperatures than airflow alone, lap after lap.
The problem: ECU power reduction on track
The GR Yaris reads intake air temperature at the MAP sensor on the intake manifold. On track the sensor heat-soaks, typically in the pits, and reports temperatures far higher than the air the engine is actually ingesting. Past the ECU's threshold it pulls timing and boost, and the car goes flat directly after leaving the pits. Stock or tuned, same thing: first heat fine, car sits, next heat the ECU limits boost.
Toyota uses a similar idea on the TG-RR GR Yaris from the 2025 Nürburgring 24h. See image.
How we found it and built the kit: GR Yaris Gen 2 heat soak issue.
What's in the box
- 1 × MAP sensor cooling duct
- 1 × radiant heat shield
Installation
No tools. No drilling, no cutting, no permanent modifications. Fully reversible.
Specifications
| Material | PAHT-CF, carbon fibre reinforced high-temperature polyamide. Made for sustained under-hood heat, resistant to oil and coolant. |
| Finish | Matte black |
| Drainage | 3 drain holes in the duct |
| Developed on | 2024 GR Yaris DAT, track days and Time Attack |
| Made in | Sweden |
FAQ
Does this work on a stock Gen 2 and Gen 1 GR Yaris? Yes. The ECU's heat-related power reduction affects stock and tuned cars alike.
Does this completely eliminate heat soak? No product can. The sensor still sits in a hot engine bay. Airflow plus a radiant barrier keeps it significantly cooler and more stable than a duct alone, which reduces ECU pull-back.
Why do I need a heat shield if I have a cooling duct? The pipe behind the sensor radiates heat continuously. A duct alone has to fight that with airflow. The shield takes the heat source out of the equation.
Can I use it in the rain? Yes, the duct has three drain holes. In extremely heavy rain, check that the sensor is not getting sprayed. If it is, remove the duct.