Description
Timed Relay – Pre-Configured for ZF 8HP with RM-Primis Control
When installing a ZF 8HP transmission with RM-Primis control, proper power management is critical for long-term reliability and transmission health. The ZF 8HP requires its Transmission Control Unit (TCU) to remain powered for at least 45 seconds after engine shutdown. This delay ensures that all adaptation values (shift learning, clutch pressure calibration, and internal data) are stored correctly, preventing drivability issues and premature wear.
Our pre-configured timed relay is designed specifically for this purpose. It monitors the ignition ON/OFF signal and, once the engine is turned off, automatically keeps the transmission powered for the required time before shutting it down. This fully automated process removes the need for manual wiring hacks or external controllers, ensuring seamless and consistent operation every time you switch off your car.
Key Features & Benefits:
Plug-and-Play Setup: Pre-configured time for RM-Primis ECU control and the ZF 8HP platform.
Critical Adaptation Storage: Keeps transmission powered long enough for safe data saving.
Extended TCU Life: Prevents corruption of adaptation values, improving reliability and shift quality.
Automatic Operation: No driver input required – the relay senses ignition and handles the delay on its own.
Compact & Durable Design: Built to handle automotive conditions with robust housing and automotive-grade components.
Optimised for Motorsports & Swaps: Perfect for custom installations, engine swaps, and performance builds using the ZF 8HP.
This timed relay is an essential accessory for anyone running a ZF 8HP with RM-Primis. Without it, shutting the car off too quickly can result in incomplete data storage, leading to erratic shifting or the need to re-learn adaptations. By adding this relay, you ensure the transmission behaves exactly as designed – smooth, consistent, and reliable.
For schematics, please check HERE
