TRX4 Scale Engine Radiator Upgrade TRX4ZSP56C by GPM  [TRX4ZSP56C]

Scale engine cooling for TRX4 builds

This TRX4ZSP56C engine radiator from GPM is an RC-scale accessory designed to add active cooling to models identified as TRX4 Trail Crawler V8 LS3. The unit combines a small axial fan and a radiator body that sits near the motor area to simulate engine cooling while the welded temperature sensor governs fan activation.

The temperature sensor is set to engage the fan at around 35°C (±5°C) and to stop near 25°C (±5°C). The fan specification lists an airflow of roughly 3.25 CFM (±10%), providing steady air movement through the radiator core whenever the sensor triggers.

Construction mixes metal and engineered plastic: the main housing uses aluminum and stainless steel, while the external cover and exhaust pipe are moulded from black heat-resistant ABS. Overall assembly dimensions are 52mm x 63mm x 71mm and the kit is supplied as a single engine radiator unit (1 pcs) for scale fitment in the motor bay.

Fitment notes for TRX-4 variants should be followed carefully: installing on a TRX-4 Defender may require removal of the exhaust manifold side for clearance and trimming of the original body post crossbar to align with the intake pipe. For front-engine conversions the manifold can be mounted to the original damper mount and fender after manifold removal, provided a flat-style front damper mount such as GPM Racing #TRX4028 or an equivalent is used to clear left and right manifolds.

This radiator is intended as a realistic cooling accessory to influence model airflow and requires bodywork or mount changes on some TRX-4 builds; check clearance and mounting style before fitting.