Description

Syvecs SyvTCM – ZF 8HP Transmission Control

Standalone Control for the ZF 8HP45 and 8HP70

The Syvecs SyvTCM provides complete standalone control of supported ZF 8HP45 and 8HP70 Gen1 rear-wheel-drive automatic transmissions.

Designed for engine conversions, restomods, motorsport vehicles and custom installations, the SyvTCM allows the highly capable ZF 8HP transmission to be installed into vehicles that were never originally equipped with it.

The system can operate alongside a Syvecs ECU, aftermarket ECU, OEM engine management system or an older engine installation with minimal electronics.

By combining flexible CAN communication, direct sensor inputs, internal torque modelling and advanced transmission strategies, the SyvTCM provides everything required to achieve fast, smooth and repeatable gear changes across a wide range of vehicle applications.

Supported ZF 8HP Transmissions

The current SyvTCM 8HP control package supports selected:

ZF 8HP45 Gen1 RWD transmissions
ZF 8HP70 Gen1 RWD transmissions

Only compatible Gen1 rear-wheel-drive mechatronic units with supported Bosch TCU hardware can be used.

The Bosch TCU identification number must be checked before purchasing a transmission, as compatibility cannot be confirmed from the gearbox casing or donor vehicle alone.

Supported TCU identification numbers and example applications can be found in the Syvecs 8HP Quick Start Manual.

Important: Not every Gen1 ZF 8HP mechatronic unit is compatible. Later units using the larger 2048 KB memory configuration are not currently supported.

A Complete Standalone 8HP Solution

The SyvTCM communicates directly with the original ZF transmission controller while managing the engine, vehicle, shifter and driver inputs required for correct gearbox operation.

This makes it possible to retain the original ZF hydraulic and clutch-control system without relying on the complete electronics package from the donor vehicle.

The SyvTCM manages:

Gear selection
Automatic shift scheduling
Manual and paddle shifting
Multiple transmission modes
Engine torque reporting
Torque-reduction requests
Downshift protection
Torque-converter lock-up
Launch-control integration
Transbrake operation
Reverse-light control
Transmission diagnostics
Gearbox safety and limp strategies

Works with Almost Any Engine Management System

When used with a Syvecs ECU, the required engine and vehicle data can be exchanged directly over CAN.

For other aftermarket or OEM ECUs, the SyvTCM can use a supported CAN protocol or its fully configurable Generic CAN Receive and Transmit functions.

The SyvTCM can also obtain important signals through its physical inputs. This makes the system suitable for older or unusual applications where little or no CAN data is available.

Engine speed can be obtained from:

Syvecs ECU CAN
Supported aftermarket ECU CAN
Supported OEM CAN
Generic configurable CAN
A frequency-based engine-speed signal
An injector or other suitable pulsed signal

Vehicle speed can be obtained from:

The ZF 8HP output-shaft speed
OEM or aftermarket CAN
Wheel-speed sensors
A suitable physical frequency input

Where the engine ECU cannot provide calculated torque values, the SyvTCM can generate its own estimated engine torque using configurable RPM, manifold-pressure, throttle-position and pedal-position tables.

Multiple Shifter Options

The SyvTCM supports several OEM and motorsport-style gear-selection options, allowing an installation to retain a factory appearance or use a simplified competition layout.

OEM Electronic Shifters

Supported options include:

BMW F-Series electronic shifter
Dodge electronic shifter
Toyota Supra A90 electronic shifter
VAG PQ electronic shifter

Depending on the selected shifter, supported functions can include:

Park, Reverse, Neutral and Drive selection
Manual mode
Sport mode
Gear-position indication
Shifter illumination
Park-button operation
Transbrake activation

CAN Keypads

The SyvTCM can also operate with:

Grayhill / MoTeC CANopen keypads
Generic CAN keypads
Custom CAN switch panels

Keypad buttons can be assigned to functions including Park, Reverse, Neutral, Drive, Manual mode, Sport mode, calibration selection and transbrake.

Paddle-Only Control

For motorsport and simplified custom installations, the transmission can be operated using two paddles and a brake input without a conventional electronic shifter.

A typical paddle-only configuration provides:

Right paddle for Drive and upshifts
Left paddle for Reverse and downshifts
Both paddles together for Neutral
Brake input for safe Drive and Reverse selection
Configurable Manual and Automatic mode switching

Built-in speed and brake interlocks help prevent unsafe Park or Reverse selection.

Multiple Transmission Modes

The gearbox behaviour can be changed to suit different vehicles, driving styles and operating conditions.

Available modes include:

Street

Smooth clutch application and progressive shifts for normal road use.

Sport

Faster shift times, increased clutch pressure and a more responsive automatic shift strategy.

Track

Rapid gear changes and higher clutch pressures for circuit and high-performance applications.

Dynamic

Smooth operation at low load, with significantly faster shifts as engine load and torque increase.

Off-Road

Progressive low-load operation with revised low-gear behaviour for off-road applications.

Drag

Dedicated functionality for drag-racing applications, including launch and transbrake integration.

Transmission modes can be selected using a supported OEM shifter, keypad, physical input or configurable CAN signal.

Automatic and Manual Shift Control

The SyvTCM provides fully configurable Automatic and Manual shift strategies.

Automatic upshift schedules can be calibrated based on:

Engine speed
Throttle position
Pedal position
Vehicle speed
Selected transmission mode
Current gear
Engine load and torque

Different shift schedules can be configured for road, sport and competition use.

In Manual mode, gear changes can be requested through the OEM shifter, paddles, keypad or CAN. Configurable protection strategies can prevent a downshift if it would cause excessive engine speed.

Temporary Manual mode can also be enabled while driving in Automatic mode. A paddle request can place the transmission into Manual mode for a configurable period before automatically returning to Drive.

Torque-Based Shift Management

Accurate torque information is essential for controlling clutch pressure and shift quality within the ZF 8HP transmission.

The SyvTCM supports:

Actual engine torque
Potential engine torque
Driver-demanded torque
Gearbox torque limits
Shift torque-reduction requests
Configurable torque multipliers
Internal torque estimation
Engine torque limiting during transmission faults

Torque values can be received directly from a compatible ECU or calculated internally by the SyvTCM.

During a gear change, the SyvTCM can transmit torque-reduction requests to the engine controller. A compatible ECU can then use ignition retard, fuel cut, throttle control or another suitable strategy to achieve the requested torque reduction.

This coordinated control reduces stress on the transmission while helping to deliver faster, smoother and more consistent shifts.

Launch Control and Transbrake

The SyvTCM 8HP control package includes advanced launch functionality for drag-racing and high-performance applications.

Available features include:

First- or second-gear launch
Custom Drive modes for Street mode below X torque and Track above X torque
Transbrake control
Controlled staging bump
Configurable bump behaviour
CAN-based launch request
Engine and transmission launch synchronisation
Temperature and operating-condition safety checks

Diagnostics and Gearbox Monitoring

The SyvTCM communicates directly with the ZF transmission controller and makes important gearbox information available within Syvecs SCal.

Available functions include:

Read and clear transmission DTCs
Reset gearbox adaptations
Monitor transmission fault and limp status
View selected and requested gear
View input-shaft and output-shaft speeds
Monitor gearbox oil temperature
Monitor shift state
Monitor torque-converter lock-up
Monitor gearbox torque requests
Monitor individual clutch activity

Fault and limp information can also be transmitted to the engine ECU, allowing engine torque to be limited if the transmission reports a problem.

High-Speed Data Logging

The SyvTCM includes powerful onboard logging to help installers and calibrators analyse gearbox operation and shift quality.

Logging can be performed:

Directly to a connected PC
To the SyvTCM’s internal logging memory
To a compatible USB memory stick

Available logging data includes:

Selected and requested gear
Input- and output-shaft speeds
Shift state and shift time
Individual clutch activity
Gearbox oil temperature
Torque-converter lock-up
Actual, potential and requested engine torque
Gearbox torque-limit requests
Paddle and shifter inputs
Transmission fault and limp status
Engine and vehicle data received over CAN

Recorded data can be opened and analysed using Syvecs SView software.

Key Features

Standalone control of supported ZF 8HP45 and 8HP70 Gen1 RWD transmissions
Compatible with Syvecs, aftermarket and OEM engine controllers
Suitable for modern and classic engine installations
Internal torque model for ECUs without torque calculations
Configurable Automatic and Manual shift strategies
OEM electronic shifter support
Paddle-only control
CAN keypad support
Multiple road and motorsport transmission modes
Torque-based clutch and shift management
Engine torque-reduction requests
Automatic upshift control
Downshift over-rev protection
Launch-control integration
Transbrake and staging-bump functionality
Reverse-light output
Direct gearbox DTC reading and clearing
Gearbox adaptation reset
Transmission fault and limp monitoring
High-speed internal and USB data logging
Live calibration through Syvecs SCal
Flexible Generic CAN Receive and Transmit
Physical inputs for non-CAN engine installations

Bring Modern 8-Speed Performance to Almost Any Vehicle

The ZF 8HP combines excellent road manners, rapid gear changes and substantial torque capacity, making it an ideal transmission for modern performance builds, engine conversions and restomod projects.

The Syvecs SyvTCM removes the dependency on the original donor vehicle electronics and provides the control, flexibility and calibration tools required to integrate the transmission into a completely different vehicle platform.

Whether the application is a comfortable road car, high-powered drag vehicle, track car, off-road build or classic conversion, the SyvTCM provides a professional standalone solution for unlocking the full potential of the ZF 8HP.