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RAM 5.7 HEMI Tune Guide

Remote tuning support for 5.7 HEMI RAM builds including MDS delete, cam swaps, long tube headers, converter tuning, transmission tuning, gear ratio changes, tire size corrections, and drivability improvements.

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1. Identify Your HEMI Setup

Year, Controller, MDS, And VVT Matter

The right calibration depends on the truck year, controller, MDS status, VVT strategy, transmission, and supporting modifications.

5.7Stock 5.7 HEMI

Factory configuration with MDS active where equipped. Tune work can improve drivability and shift quality where supported.

MDS5.7 HEMI With MDS

MDS is the Chrysler/RAM cylinder deactivation system. JRJ needs to know if it is still active.

DELMDS Delete

Mechanical MDS delete requires tune changes so the calibration matches the installed hardware.

CAMCammed HEMI

Cam swaps require cam card/specs, idle work, startup behavior, and VVT strategy details.

MODLong Tubes / Converter / Gears

Supporting mods affect fueling, airflow, shift feel, speedometer correction, and drivability.

2. MDS And VVT Notes

MDS Disable Is Not The Same As Mechanical Delete

  • MDS is Chrysler/RAM cylinder deactivation.
  • Tune-only MDS disable keeps factory hardware installed.
  • Mechanical MDS delete requires matching calibration changes.
  • Cam swaps may require MDS delete depending on parts.
  • VVT may be retained or locked depending on cam and goals.
  • JRJ needs the installed hardware details before tuning.
3. Common HEMI Tune Goals
DDDaily Driver Tune
MDSMDS Disable
DELMDS Delete Tune
CAMCam Swap
LTLong Tube Headers
CONConverter Tune
GRGear / Tire Correction
TCMShift Quality
IDLIdle / Stall Fix
FANFan Settings
4. Cammed HEMI Planning

Send Cam Card / Specs Before Tuning

  • Cam card or cam specs required
  • Idle airflow and idle spark calibration
  • Startup and cold start behavior
  • VVT retained or lockout strategy
  • Converter, gears, and tire size
  • Long tubes, cats, or exhaust status
  • Injector size if changed
  • Transmission behavior notes
5. What JRJ Tunes

HEMI Calibration Areas

MDS

MDS logic

IA

Idle airflow

SPK

Idle spark

STA

Startup airflow

VVT

VVT strategy

AIR

Fuel / airflow model

TRN

Transmission behavior

CON

Converter behavior

FAN

Fan settings

TIR

Tire / gear correction

6. Common HEMI Problems

When Tuning Helps And When Diagnosis Comes First

Starts Then Dies

Likely cause may include airflow, startup, or tune setup issues.

Send: stock file, cam specs, codes, logs.

Stalls Into Gear

Idle airflow, converter, or transmission behavior may need work.

Send: converter, transmission, cam specs.

Idle Surge

Idle airflow, spark, or fuel model may need refinement.

Send: idle log and full mod list.

Throttle Hang

Drive-by-wire, airflow, or calibration setup can contribute.

Send: logs and current behavior notes.

Rich / Lean Trims

Airflow model, exhaust leaks, or injector data may be involved.

Send: injector info, exhaust setup, logs.

Poor Shift Feel

Shift timing, pressure, torque model, or tire size can affect feel.

Send: transmission, gear, tire size.

Converter Issues

Converter stall and lockup behavior may need calibration changes.

Send: converter stall and use case.

Long Tube Codes

Exhaust sensor and catalyst setup must match the installed parts.

Send: headers, cats, sensor details.

Speedometer Wrong

Gear ratio or tire size changes can throw speed calculation off.

Send: measured tire size and gear ratio.

Fan Settings

Fan on/off settings may need correction for the build.

Send: thermostat and cooling setup.
7. What To Send JRJ

File, Hardware, And Build Details

  • Stock read file
  • Calibration details screenshot
  • VIN
  • Year / model
  • Engine
  • Transmission
  • Cam card/specs
  • MDS status
  • VVT retained or locked
  • Injectors
  • Headers / cats
  • Converter
  • Gear ratio
  • Tire size
  • Current codes
  • Logs if available
8. Your Tune Journey

Purchase To Revision

1

Purchase

Choose the right tune path.

2

Read

Save the stock file.

3

Upload

Send file and details.

4

Review

JRJ checks the setup.

5

Built

Your tune is created.

6

Flash

You flash the tune.

7

Logs

Send logs for revisions.

9. Shop Your HEMI Build

Choose The Tune Path That Fits

JRJ

Build Your Tune

Custom tune path for your 5.7 HEMI build.

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MDS

HEMI MDS Delete Tune

For MDS delete setup and hardware support.

Shop Now
CAM

HEMI Cam Tune

Cam swap tune with idle, VVT, and startup support.

Shop Now
LT

Long Tube Tune

For headers, cats, and exhaust setup details.

Learn More
AI

Ask Tuner AI

Get help choosing the right tune path.

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10. FAQ

Frequently Asked Questions

Can JRJ tune a 5.7 HEMI?

Yes, many 5.7 HEMI RAM workflows can be supported when the year, controller, tuning access, and stock read file are compatible.

What is MDS?

MDS is Chrysler/RAM cylinder deactivation. It can command certain cylinders off under light-load conditions when factory hardware and calibration allow it.

Do I need a tune after MDS delete?

Yes. Mechanical MDS delete work requires calibration changes so the tune matches the installed hardware.

Can JRJ tune a cammed HEMI?

Supported cammed HEMI workflows require accurate cam specs, MDS status, VVT status, converter details, exhaust details, and logs when available.

Do I need to know my VVT setup?

Yes. JRJ needs to know if VVT is retained or locked because the calibration path changes.

Can JRJ tune long tube headers?

Long tube header support is available where the vehicle and workflow are supported. Send header, cat, sensor, and code details.

Can JRJ correct gears and tire size?

Gear and tire correction is available where supported. Send exact gear ratio and measured tire size.

Do I need HP Tuners credits?

Most HEMI remote tuning workflows use HP Tuners. Credits are sold separately by HP Tuners and may be required for supported ECM and TCM access.

What file do I send after purchase?

Send your stock read file, calibration details screenshot, VIN, year/model, engine, transmission, build details, codes, and logs if available.

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Choose The Right Platform. Get The Right Tune.

Send JRJ the correct stock file, HEMI setup, MDS status, VVT strategy, and build details so your tune starts from the right foundation.

Build Your Tune