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Windows Desktop Transmission Calibration Software Suite

The HDR Performance MOPAR Transmission Tool Suite is a Windows desktop software package designed to help professional tuners and experienced enthusiasts build, review, visualize, and organize transmission shift schedules for supported MOPAR platforms.

The current download includes two dedicated programs in one ZIP package:

• HDR Performance RFE Transmission Tool for 45RFE and 545RFE applications

• HDR Performance 8HP Transmission Tool for supported 8HP GEN 1 and GEN 2 applications

Separating the transmission families into dedicated programs provides a cleaner workflow while retaining the calibration logic, table-generation features, visual graphs, vehicle-speed calculations, and .HDRPT project support developed for each platform.

The software converts desired engine RPM targets into transmission output-shaft-speed values, helping simplify the process of creating usable shift tables for HP Tuners. Generated tables can be reviewed as output-shaft speed, calculated engine RPM, or estimated vehicle speed before being transferred into the vehicle calibration.

Supported Transmissions

RFE

• 45RFE

• 545RFE

8HP GEN 1

• 8HP45 / 845RE

• 8HP70

• 8HP90

8HP GEN 2

• 8HP50 / 850RE

• 8HP75

• 8HP95

Key Features

• Dedicated RFE and 8HP Windows desktop applications

• Generate upshift and downshift tables from engine RPM targets

• Global or individual shift-point control

• Global or individual minimum and maximum upshift RPM targets

• Global or individual minimum and maximum downshift RPM targets

• Engine-RPM-to-output-shaft-speed calculations

• Adjustable upshift trigger buffer

• Part-throttle upshift and downshift scaling

• Anti-hunt separation protection

• Monotonic table-shape protection

• Optional table smoothing

• Custom 8HP transmission gear ratios

• Import HP Tuners tables and shift matrices

• Support for HP Tuners Copy with Axis data

• Retain imported accelerator-pedal axes and stock table shapes

• Compare generated values against active stock or reference tables

• Copy generated OSS rows and matrices for transfer into HP Tuners

• Save and reopen complete projects using the exclusive .HDRPT format

• Installed Windows desktop applications with no browser required

Interactive Shift-Curve Graphs

Both programs include interactive visual graphs that make it easier to review shift behavior across accelerator-pedal position.

Depending on the selected program, the graph can display:

• Output Shaft Speed

• Calculated Engine RPM

• Estimated Vehicle Speed

• Generated shift curves

• Active stock or imported reference curves

• Individual shift transitions

• Upshift groups

• Downshift groups

• Complete transmission curve overviews

Hover over the graph to review exact pedal-position and output values. Individual curves can also be hidden or displayed using the graph legend.

Vehicle-Speed Calculations

Enter the vehicle’s:

• Final-drive ratio

• Tire diameter in inches

The software can then display estimated vehicle speed throughout the generated tables, reference tables, and interactive graphs.

Vehicle-speed calculations are provided for analysis and reference only. Final-drive ratio and tire diameter do not alter the generated HP Tuners output-shaft-speed calibration values.

45RFE / 545RFE Features

The RFE program supports all eleven included upshift and downshift tables:

• 1–2 Upshift

• 2–1 Downshift

• 2–2 Prime Upshift

• 2 Prime–2 Downshift

• 2 Prime–3 Upshift

• 3–2 Prime Downshift

• 2–3 Upshift

• 3–4 Upshift

• 4–3 Downshift

• 4–5 Upshift

• 5–4 Downshift

RFE calibrations include global or individual minimum and maximum RPM targets for each applicable shift. Upshift curves are generated first, and paired downshift curves are then limited by the selected anti-hunt separation to help reduce shift cycling.

8HP Features

The 8HP program generates a complete 12-row by 14-column upshift and downshift matrix.

It includes:

• Seven upshift transitions

• Seven downshift transitions

• Global or individual RPM targets

• Minimum and maximum RPM endpoints

• GEN 1 and GEN 2 transmission ratios

• Optional custom gear ratios

• Imported stock/reference matrix comparison

• Accelerator-pedal-axis importing

• Configurable curve strategies

• Change highlighting

• Matrix and pedal-axis copying

HP Tuners Table Importing

The software supports importing HP Tuners table data using Copy with Axis.

This allows the programs to retain:

• Accelerator-pedal axis values

• Shift-column labels

• Existing OSS table or matrix values

• Factory or previously modified curve shapes

After pasting the copied data into the appropriate import panel, select the import button and enable the imported-data option before generating the new calibration.

.HDRPT Transmission Profiles

The included .HDRPT project system allows complete transmission projects to be saved without manually recording every setting.

Saved projects can include:

• Selected transmission

• Minimum and maximum RPM targets

• Global and individual shift targets

• Imported tables or matrices

• Imported pedal axes

• Shift scaling

• Anti-hunt settings

• Trigger buffers

• Final-drive ratio

• Tire diameter

• Custom transmission gear ratios

• Curve strategies

• Graph preferences

• Generated table or matrix data

Open the saved .HDRPT profile later to review, revise, or continue building the transmission calibration.

Product Delivery

The current product download is supplied as one ZIP package containing both Windows desktop programs.

The package includes:

• RFE Transmission Tool installer

• 8HP Transmission Tool installer

• Updated combined user guide

• Supporting documentation

Each program installs separately and can be launched from its own Windows desktop or Start Menu shortcut.

System Requirements

• Windows 10 or Windows 11

• 64-bit Windows computer

• HP Tuners VCM Editor is required to transfer generated values into an actual vehicle calibration

• A PDF reader is recommended for the included user guide

Important Information

This software is a calibration-assistance, calculation, visualization, and table-generation tool. It does not directly connect to, read, write, or flash a vehicle.

All generated values must be reviewed by a qualified tuner before being entered into a calibration or flashed to a vehicle. Actual shift behavior may be affected by converter slip, torque management, clutch pressure, shift delay, tire size, final-drive ratio, transmission condition, operating-system strategy, and other calibration settings.

Vehicle-speed output is an estimate based on entered tire diameter, final-drive ratio, and output-shaft speed. Actual road speed may vary.

Beta software: Features, calculations, supported platforms, and interface functions may continue to be refined as development progresses.

Edit with Confidence

Import Fuel, Spark, Custom, and supported structured 4D tables while preserving the original calibration as an untouched reference.

• Separate Imported Reference and Edited Working Copy

• Direct numeric and percentage-based adjustments

• Horizontal, vertical, and 2D interpolation

• Adjustable smoothing strength and direction

• Editable and resizable table axes

• Independent undo and redo history

• Update the reference without importing the table again

• Copy edited tables back into Haltech NSP

Analyze Real Datalogs

Load and play back long Haltech CSV datalogs while tracing the engine’s operating position across the tables and graphs.

• Synchronized playback, seeking, zooming, and panning

• Configurable multi-graph LOG workspace

• Live Fuel, Spark, Custom, and VE-map cell tracing

• Lambda, Short-Term Fuel Trim, and Long-Term Fuel Trim analysis

• Minimum-hit filtering and user-controlled correction limits

• Custom PID histogram and log-data matrix tools

See Every Change

Review tables using multiple visual comparison modes:

• Color-mapped cell matrices

• 2D line graphs and heat maps

• 3D surfaces and wireframes

• Edited-versus-reference overlays

• Difference views

• Dark Mode, Light Gray, and Battlezone-inspired Retro Green themes

Designed for Every Experience Level

Choose Beginner, Novice, or Expert mode to match the amount of control and information you want on screen.

Complete projects can be saved in the dedicated HDRHT format, preserving tables, references, axes, graph settings, analysis maps, supported 4D layers, themes, and project details.

Built by a tuner, for tuners—designed to improve table control, speed up datalog review, and keep detailed calibration work organized.

Current 4D Compatibility

Structured 4D importing has been verified with alcohol-percentage Axis 0 tables used in flex-fuel Spark and Fuel configurations. Other 4D structures or scaling formats may not yet be officially supported.

Beta Software Notice

HT Buddy is actively developed using real-world tuning feedback. Always review calculated corrections and edited tables before writing changes to an ECU.

Third-Party Disclaimer

HDR Performance HT Buddy is independently developed companion software. It is not manufactured, sponsored, affiliated with, or endorsed by Haltech. Haltech and NSP are trademarks of their respective owner.

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⚠️ Important Note: This is an add-on package only and must be purchased in conjunction with an HP Tuners-based GM or Dodge Tune. Orders placed without a qualifying base tune will be subject to cancellation.