BMW ZF8 Transmission · Gearbox Software

xHP
GEARBOX
SOFTWARE

The Complete Guide to ZF8 Gearbox Tuning for BMW

xHP Flashtool is the industry-leading software solution for BMW's ZF8HP automatic gearbox. It recalibrates shift logic, torque management and response characteristics at a fundamental level – transforming the way your BMW drives without a single hardware change.

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xHP Dealer Worldwide

ST3

What Is xHP?

xHP Flashtool is a professional gearbox calibration software developed specifically for BMW's ZF8HP automatic transmission – one of the most widely used and capable automatic gearboxes in the world.

The ZF8HP is an 8-speed automatic fitted to a vast range of BMW models from 2009 onwards. From the factory, BMW calibrate the gearbox conservatively – prioritising smooth operation, economy and refinement over outright performance.

xHP completely rewrites the gearbox's control software. Shift speeds, torque limits, gear hold logic, launch control, kickdown behaviour and sport mode characteristics are all recalibrated to unlock the transmission's full capability.

Unlike a simple gearbox remap or TCU flash, xHP is a complete software platform with multiple stages, driver-configurable profiles and the ability to be adjusted remotely via the xHP smartphone app.

What xHP Recalibrates

Shift Speed

Up to 40% faster

Torque Limits

Raised to match engine tune

Shift Points

Fully recalibrated per mode

Launch Control

Optimised for max traction

Gear Hold Logic

Holds gears under braking

Gear Display

Current gear shown at all times

Driver Profiles

Comfort / Sport / Sport+

Software Stages

xHP Stages Explained

xHP is available in three stages for road use. The stage you need depends on your engine tune and how you use the vehicle.

ST1

Entry Level

Faster shift speeds in Sport mode
Gear display enabled
Improved Sport mode shift points
Minor torque limit increase
Suitable for stock engines

ST2

Performance

Significantly faster shifts
Increased torque limits
Launch control optimised
Gear hold under deceleration
Stage 1 engine tune compatible

Key Features

xHP delivers improvements across every aspect of how the ZF8HP operates – not just faster shifts, but smarter, more intelligent gearbox behaviour throughout.

Faster Shift Speeds

Stock ZF8HP shifts are deliberately slowed for refinement and comfort. xHP dramatically reduces the time between gear changes – particularly noticeable in Sport and Sport+ modes where the difference is immediate and significant.

Torque Limit Removal

The factory gearbox software imposes torque limits to protect the transmission for a standard engine. When you remap the engine, these limits become a bottleneck. xHP removes them, allowing the gearbox to handle the full output of your tuned engine.

Smarter Gear Logic

xHP recalibrates how the gearbox decides when to change gear. Under load it holds gears longer and at higher revs. Under braking it downshifts more aggressively to match engine braking. The result is a gearbox that actually responds to how you're driving.

Launch Control

xHP optimises the launch control system for maximum acceleration from a standing start. Slip management, torque delivery and clutch engagement are all calibrated to get the car off the line as quickly as possible without wheel spin or drivetrain stress.

Smartphone App Control

xHP includes a dedicated smartphone app that allows the driver to switch between calibrated profiles, monitor gearbox temperature and adjust behaviour on the fly. Comfort, Sport and Sport+ modes can all be configured independently.

Gear Display

xHP enables a real-time gear position display on the instrument cluster or iDrive screen, showing which of the 8 gears is currently selected across all driving modes – including Comfort where this information is otherwise hidden by BMW.

Stock vs xHP

Standard Software vs xHP

The ZF8HP is an excellent gearbox. But BMW deliberately limit its behaviour from the factory. Here's what changes with xHP installed.

Stock BMW ZF8HP

Slow, comfort-biased shift speeds in all modes
Torque limits set for a standard engine
Early upshifts to maximise economy
Sport mode shifts feel soft and delayed
Gearbox unaware of engine tune level
No gear display in Comfort or Auto mode
Launch control heavily restricted from factory
Conservative kickdown behaviour

With xHP Stage 3

Dramatically faster shifts in Sport & Sport+
Torque limits raised to match your engine tune
Gear hold logic keeps you in the power band
Sport mode shifts feel immediate and decisive
Gearbox and engine calibrated together
Gear display active across all modes
Optimised launch control for max acceleration
Aggressive downshifts under heavy braking

Compatibility

Compatible Vehicles

xHP supports a wide range of BMW and other ZF8HP-equipped vehicles. If your car has a ZF8HP automatic gearbox, it's almost certainly compatible.

BMW

F & G Series · Petrol & Diesel

1 Series (F20/F21, G20)
2 Series (F22/F23, G42)
3 Series (F30/F31, G20/G21)
4 Series (F32/F33/F36, G22/G23)
5 Series (F10/F11, G30/G31)
6 Series (F06/F12/F13)
7 Series (F01/F02, G11/G12)
8 Series (G14/G15/G16)
X3 / X4 (F25/F26, G01/G02)
X5 / X6 (F15/F16, G05/G06)
M2 / M3 / M4 (select variants)

BMW

Engines – Petrol & Diesel

B57 – 3.0 diesel (20d, 30d, 40d)
N57 – 3.0 diesel (30d, 35d, 40d)
B47 – 2.0 diesel (18d, 20d)
N47 – 2.0 diesel (18d, 20d)
B58 – 3.0 petrol (30i, 40i)
N55 – 3.0 petrol (30i, 35i)
N63 – 4.4 V8 petrol
S55 – 3.0 petrol M engines
S58 – 3.0 petrol M engines

Not Sure?

If your BMW has a ZF8HP automatic gearbox, it's almost certainly compatible. Get in touch and we'll confirm for your specific model.

Why Choose Us

Why DC Remapping UK for xHP

xHP is only as good as the installer. The software needs to be configured correctly for your specific engine tune level, driving style and vehicle specification. Getting this wrong can result in gearbox stress, poor driveability or missed performance.

As a #2 ranked xHP dealer worldwide, we have fitted more xHP installations than almost any other company on the planet. We configure every installation specifically to the vehicle – not a generic Stage 3 written for a different car.

Ranked #2 xHP dealer worldwide – among the most experienced installers on the planet
Every xHP install configured specifically for your engine tune and vehicle
Combined engine and gearbox calibration on our 4WD linked dyno
Torque limits set to match your exact engine output – not a generic figure
xDrive and 4WD vehicles tuned safely on our mechanically linked rolling road
Customers travel from across the UK for our xHP installations

xHP Dealer Worldwide

Ranked second globally across the entire xHP international dealer network. One of the most experienced ZF8 gearbox calibration specialists anywhere in the world.

Bundle & Save

Combine a Stage 1 engine tune with xHP Stage 3 for the complete N57/B57 transformation. The two calibrations work together – gearbox torque limits are set to match the exact engine output for a seamless, cohesive result.

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