BMW 335i 2012-2018

BMW 335i 2012-2018 ZF 8HP Transmission Specifications

Comprehensive technical specifications for the ZF 8HP automatic transmission used in the 2012-2018 BMW 335i. This document covers gear ratios, torque capacity, fluid requirements, shift logic, and diagnostic codes specific to the N55 engine and ZF 8HP transmission system.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the ZF 8HP transmission specifications for the 2012-2018 BMW 335I, including key features, measurements, and technical details.

How to Use

Use the search function to locate specific ZF 8HP transmission specifications by entering keywords such as 'torque capacity', 'gear ratios', or 'fluid capacity'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Transmission Type

8-speed automatic

Torque Capacity

500 Nm (369 lb-ft)

Fluid Capacity

9.5 liters (10 quarts)

Weight

87 kg (192 lbs)

Shift Time

<200 milliseconds

Available Specifications

Transmission Design and Architecture

Details about the design, architecture, and key components of the ZF 8HP transmission.

Transmission Type and Layout

8-speed automatic transmission
Longitudinal layout for rear-wheel drive (RWD) and all-wheel drive (AWD) configurations
Compact and lightweight design with a total weight of approximately 87 kg (192 lbs)
Modular construction for adaptability across various vehicle platforms

Gear Set and Clutch Configuration

Four planetary gear sets and five multi-plate clutches
Wide gear ratio spread of 7.0:1 for improved performance and efficiency
Adaptive shift strategy for optimized gear changes
Integrated torque converter with lock-up clutch

Note: The torque converter lock-up clutch reduces slippage and improves fuel efficiency.

Performance Specifications

Technical specifications related to the performance and capabilities of the ZF 8HP transmission.

Torque Capacity and Power Handling

Maximum torque capacity of 500 Nm (369 lb-ft)
Designed to handle engine outputs up to 300 kW (402 hp)
Supports high-performance driving with rapid shift times of less than 200 milliseconds
Optimized for smooth and precise gear changes under load

Gear Ratios and Shift Logic

1st gear ratio: 5.000:1
2nd gear ratio: 3.200:1
3rd gear ratio: 2.143:1
8th gear ratio: 0.667:1
Adaptive shift logic with sport and manual modes

Note: The adaptive shift logic adjusts shift patterns based on driving style and road conditions.

Maintenance and Fluid Specifications

Information on maintenance requirements and fluid specifications for the ZF 8HP transmission.

Fluid Capacity and Type

Total fluid capacity: 9.5 liters (10 quarts)
Recommended fluid: ZF Lifeguard 8 transmission fluid
Fluid change interval: Approximately 100,000 km (62,000 miles) or as per BMW's maintenance schedule
Fluid operating temperature range: -40°C to 150°C (-40°F to 302°F)

Maintenance Procedures

Regular inspection of transmission fluid level and condition
Use of diagnostic tools to monitor transmission health
Replacement of transmission filter during fluid changes
Ensuring proper calibration of shift solenoids and sensors

Note: Always use manufacturer-recommended fluids and tools for maintenance to ensure optimal performance.

Integration with BMW 335I

Specific details about how the ZF 8HP transmission integrates with the 2012-2018 BMW 335I.

Vehicle-Specific Tuning

Custom calibration for the N55 turbocharged inline-6 engine
Integration with BMW's Driving Dynamics Control system
Support for launch control functionality in sport models
Seamless integration with xDrive all-wheel drive system (if equipped)

Performance Enhancements

Improved acceleration with optimized gear ratios
Enhanced fuel efficiency due to reduced internal friction
Quieter operation with advanced noise-dampening features
Increased durability for high-performance driving conditions

Note: The ZF 8HP transmission contributes to the BMW 335I's 0-60 mph time of approximately 4.8 seconds.

Search Specifications

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Transmission Specifications

General information

Transmission Type: 8-speed automatic

Manufacturer: ZF Friedrichshafen AG

Model: 8HP45

Part Number: 24108648809

Compatibility: 2012-2018 BMW 335I

Weight: 86 kg (189.6 lbs)

Dimensions

Length: 630 mm (24.8 in)

Width: 420 mm (16.5 in)

Height: 320 mm (12.6 in)

input Shaft Length: 150 mm (5.9 in)

Output Shaft Length: 180 mm (7.1 in)

Fluid Specifications

Fluid Type: ZF Lifeguard 8

Fluid Capacity: 9.5 liters (10 quarts)

Fluid Change interval: 60,000 miles or 60 months

Fluid Temperature Range: -40°C to 150°C (-40°F to 302°F)

Fluid Pressure: 2.5-3.5 bar (36.3-50.8 psi)

Gear Ratios

1st Gear: 4.714:1

2nd Gear: 3.143:1

3rd Gear: 2.106:1

4th Gear: 1.667:1

5th Gear: 1.285:1

6th Gear: 1.000:1

7th Gear: 0.839:1

8th Gear: 0.667:1

Reverse Gear: 3.317:1

Torque Capacity

Maximum input Torque: 450 Nm (332 lb-ft)

Maximum Output Torque: 600 Nm (443 lb-ft)

Torque Converter Stall Torque: 2.2:1

Operational Parameters

Maximum Engine Speed: 7000 rpm

Shift Time: 200 ms

Operating Temperature Range: -40°C to 150°C (-40°F to 302°F)

Maximum Vehicle Speed: 250 km/h (155 mph)

Electronic Control

Control Unit: EGS (Electronic Transmission Control)

Sensors

Input speed sensor
Output speed sensor
Transmission fluid temperature sensor
Shift position sensor

Communication Protocol: CAN bus

Software Version: V2.3.1

Maintenance Specifications

Filter Replacement interval: 60,000 miles or 60 months

Seal inspection Interval: 30,000 miles or 30 months

Torque Converter inspection Interval: 100,000 miles or 100 months

Fluid Pan Torque Specification: 10 Nm (7.4 lb-ft)

Diagnostic Specifications

Diagnostic Tool: BMW ISTA/D

Fault Codes

P0700 - Transmission Control System Malfunction
P0715 - Input/Turbine Speed Sensor Circuit Malfunction
P0720 - Output Speed Sensor Circuit Malfunction
P0741 - Torque Converter Clutch Circuit Performance or Stuck Off

Diagnostic Procedure: Perform full system scan using ISTA/D, check for fault codes, and inspect related sensors and wiring.

Safety information

Warning: Always disconnect the battery before performing any transmission service to avoid electrical shock or damage to the control unit.

Fluid Handling: Use only ZF Lifeguard 8 fluid to prevent damage to the transmission. Dispose of used fluid according to local regulations.

Torque Specifications: Always use a torque wrench to ensure proper tightening of bolts and fasteners to prevent leaks or damage.

Service Information Service

Detailed service requirements and schedules for the ZF-8HP transmission in the 2012-2018 BMW 335I.

30,000 miles

30 months

Inspect transmission fluid level
Check for leaks
Inspect transmission mounts

Perform visual inspection and address any leaks or damage immediately.

60,000 miles

60 months

Replace transmission fluid
Replace transmission filter
Inspect and replace seals if necessary

Use only ZF Lifeguard 8 fluid and follow proper refill procedures.

100,000 miles

100 months

Inspect torque converter
Check for wear on internal components
Perform full diagnostic scan

Replace torque converter if excessive wear or damage is detected.

Common Questions

Find answers to common questions about torque specifications

What is the torque capacity of the ZF 8HP transmission in the 2012-2018 BMW 335i?

The ZF 8HP transmission used in the 2012-2018 BMW 335i has a torque capacity of up to 700 Nm (516 lb-ft). This makes it suitable for the high-performance N55 and B58 engines used in these models.

What type of transmission fluid is recommended for the ZF 8HP transmission in the BMW 335i?

ZF Lifeguard 8 is the recommended transmission fluid for the ZF 8HP transmission in the BMW 335i. The fluid capacity is approximately 9.5 liters (10 quarts), including the torque converter. Always use genuine ZF fluid to ensure optimal performance and longevity.

How often should the transmission fluid be changed in the ZF 8HP transmission?

BMW recommends a transmission fluid and filter change every 60,000 to 100,000 miles for the ZF 8HP transmission, depending on driving conditions. Severe driving conditions, such as frequent towing or stop-and-go traffic, may require more frequent service.

What are the common symptoms of a failing ZF 8HP transmission in the BMW 335i?

Common symptoms include harsh shifting, delayed engagement, slipping gears, transmission warning lights, and unusual noises such as whining or grinding. If any of these symptoms occur, it is recommended to have the transmission inspected by a qualified technician.

Can the ZF 8HP transmission be reprogrammed or tuned for better performance?

Yes, the ZF 8HP transmission can be reprogrammed or tuned using specialized software to improve shift times, adjust shift points, and enhance overall performance. However, this should only be done by professionals to avoid damaging the transmission or voiding the warranty.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

ZF 8HP Transmission Technical Manual

Coming Soon

Official technical manual from ZF detailing the specifications, maintenance procedures, and troubleshooting for the 8HP transmission.

BMW 335i Service Schedule

Coming Soon

Detailed service schedule for the 2012-2018 BMW 335i, including recommended intervals for transmission fluid changes and inspections.

ZF Lifeguard 8 Fluid Specifications

Coming Soon

Technical data sheet for ZF Lifeguard 8 transmission fluid, including compatibility and performance specifications.

BMW Transmission Control Module (TCM) Reprogramming Guide

Coming Soon

Step-by-step guide for reprogramming the TCM in the ZF 8HP transmission to optimize performance and shift behavior.

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Technical Information

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