JRJ Racing · LS3 and L99 cam tuning
LS3 & L99 Cam Remote Tuning
Get your LS3 or L99 cam tune built from the car's own read. Give Jason the exact engine, cam and transmission combination, then choose the service and supported modifications that fit your build.
Personally tuned by Jason
Work directly with Jason—the owner and tuner who built and tuned these combinations in the shop.
Built around your vehicle
Your original stock read, exact cam and installed parts guide the tune.
Support through your Tune Portal
Keep your files and feedback together. Full Custom includes datalog review and up to five revisions.
Build your LS3 or L99 cam tune
Choose your vehicle and exact cam, select Base or Full Custom, then add your installed modifications.
HP Tuners required · equipment & credits
Requires supported HP Tuners MPVI2, MPVI3 or MPVI4 equipment for your exact vehicle. Hardware, licensing and required controller access are separate. RTD and TDN are not currently supported.
Vehicle first. Tune path before modifications.
Choose each part of the vehicle in order. After the camshaft, confirm the transmission and drivetrain, then select the tune type so the builder can show only the options supported by that path.
Enter the specifications shown on your cam card. Durations must be measured at .050-inch tappet lift—not advertised duration.
Choose how far you want to take it
Complete the vehicle fields above to choose your tune. Click a card to choose your service. Service selected. Choose your installed modifications below.
Selected service: scope, revisions & turnaround
Modifications & options · select your installed parts
Paid selections are matched to the existing Shopify tune add-on products and added with the tune. Free and unlisted details stay attached to the order.
Downloadable .HPT files are limited to the selected supported camshaft calibration or supported DOD/AFM/MDS/VVT delete calibration. They do not include tuning changes for blowers, headers, intakes, injectors, fuel systems, heads, converters, transmissions, tire size, gear ratio, or other add-ons.
Downloadable files cover the listed cam or delete setup and do not include modification add-ons. If your vehicle has additional modifications, choose a Base Tune or Full Custom Remote Tune.
Shopify is verifying that the exact file is available for sale.
Open the library with this selection, then review the listed file details and all seven buyer requirements. If no matching file is listed, choose a remote tune built from your own read.
No closest file will be substituted. Choose a tune built from your own vehicle file instead.
Vehicle → exact cam → transmission → service → modifications
- Vehicle
- —
- Engine
- —
- Transmission / Drivetrain
- Not Provided / Not Provided
- Cam
- —
- Tune Type
- —
- Modifications
- —
- Blowers
- LSA: No / Hellcat: No
- Total
- —
From your build to your tune
Your tune, one step at a time
After checkout, your Tune Portal keeps the build details, files and conversation in one place.
- 01
Configure your tune
Use the builder to choose your vehicle, cam, service and installed modifications.
- 02
Upload your stock read
After purchase, use your Tune Portal to send the original read, cam card and complete build details.
- 03
Receive Revision 1
Revision 1 is guaranteed within 24–72 business hours after JRJ receives your stock read. This guarantee applies to the first revision only.
- 04
Log, review and refine
Full Custom includes datalog review and up to five revisions for the purchased setup. Later submissions enter the queue in the order received; there is no guaranteed completion date.
Your private Tune Portal
One place for every file and conversation.
Upload your stock read, receive your tunes and send feedback directly to Jason. Full Custom datalogs and revisions stay with your order.
- Original reads & delivered tunes
- Datalogs & revisions
- Messages & order progress
How we work through your revisions
Revision 1 is guaranteed within 24–72 business hours after JRJ receives your stock read. The tune is based on your original read and the build details you provide. Follow the delivery instructions and report how the vehicle behaves.
Base Tune includes one revision. Full Custom includes datalog review and up to five revisions for the purchased setup. The next adjustment depends on the logs, feedback and issues identified; there is no fixed sequence that fits every build.
After Revision 1, progress depends on vehicle condition, installed parts, mechanical or installation issues, tuning equipment and the quality of the logs. It also depends on when you have time to log and upload, when JRJ receives usable files and the time needed to review them.
Logs and follow-up requests enter the queue and are handled in the order received. Waiting for logs, answers, parts or repairs pauses the next step. A new submission does not start another 24–72-business-hour guarantee.
JRJ will work carefully and in good faith to help with your purchased service. Remote tuning cannot guarantee perfection, mechanical stability or a specific power result. Review the service and refund terms before ordering.
What changes in the tune?
Give Jason the exact LS3 or L99 cam card, the installed transmission, and the clutch or converter details. For an L99 conversion, record the completed AFM and VVT hardware changes. Full Custom adds datalog review and refinement for the combination you supply.
Startup & idle
Starting airflow, idle control and in-gear behavior are reviewed against the cam and operating data. Describe when a stall, surge or restart problem occurs.
Airflow & fueling
Provide the intake, injectors, fuel and sensor information. Relevant airflow and fueling changes must be assessed with the correct component data.
Valve & torque control
Select the cam and any installed cylinder-deactivation or VVT hardware changes applicable to your engine. The tune must reflect the parts actually installed.
Transmission & converter
Identify the transmission, converter, tire diameter and axle ratio. Their effect on the driving experience belongs in the build information.
The controller, service selected and installed hardware determine which adjustments are available. tune is not a repair for incorrect mechanical installation.
Have these details ready
- Select your year, make, model and engine in the dropdowns
- Select Stock Cam or the exact installed cam from the full list
- Original stock read, controller and operating-system ID
- Installed cylinder-deactivation and VVT hardware, where equipped
- Transmission, converter, axle ratio and tire size
- Injectors, fuel type, intake, exhaust and other changes
For an LS3, include the actual transmission and clutch or converter. For an L99 cam swap, also identify the AFM lifters and VVT or phaser arrangement that remain after the work. See the Camaro cam guide or Corvette cam guide for vehicle-specific details.
Technical reference
LS3 and L99: keep the differences clear.
Factory references help identify the starting point; your completed hardware is what JRJ needs.
LS3 or L99. Match the whole car.
LS3 engine reference
| Specification | Details |
|---|---|
| Displacement | 6.2L |
| Engine family | GM Gen IV |
| Fuel system | Port injection |
LS3 or L99. Match the whole car.
L99 application reference
| Specification | Details |
|---|---|
| Displacement | 6.2L |
| Factory example | Fifth-generation Camaro SS with automatic transmission |
| Deactivation system | Factory AFM-equipped L99 |
Technical reference
Explain the cam and drivetrain changes.
Keep any conversion details attached to the original vehicle and read.
LS3 or L99. Match the whole car.
Document the completed cam setup
| Specification | Details |
|---|---|
| Cam identity | Manufacturer, exact part number and cam card with duration, lift and lobe separation |
| Valvetrain | List the actual cam, lifter and phaser hardware |
| Airflow & fuel | List the installed intake, exhaust, injectors and fuel |
LS3 or L99. Match the whole car.
Keep the drivetrain with the build
| Specification | Details |
|---|---|
| Transmission | Actual installed unit |
| Converter / clutch | Identify the fitted parts and relevant changes |
| Final drive | Tire size and rear gearing |
LS3 or L99. Match the whole car.
The equipment and read
| Specification | Details |
|---|---|
| Tuning platform | Confirm supported HP Tuners equipment |
| Optional interface | Add an MPVI4 to the remote tune |
| Separate items | Vehicle credits and required controller access |
Choose the actual vehicle and engine in the builder. Record the transmission, cam part number and the hardware retained or changed. Do not select LS3 to describe an L99 conversion without explaining the original engine, controller and completed changes.
Straight answers
LS3 / L99 tuning questions
Can I add an HP Tuners device?
Yes. Use an HP Tuners MPVI2, MPVI3 or MPVI4 supported for your exact vehicle. Add the MPVI4 in the remote-tune builder if needed; vehicle credits and controller-access requirements remain separate.
What drivetrain details should I include?
Identify the installed transmission and converter or clutch, along with tire size and rear gearing. Select supported tuning add-ons that apply to those changes.
Why does the builder keep LS3 and L99 separate?
Chevrolet identifies the L99 used in fifth-generation automatic Camaro SS models as an AFM-equipped version. That engine and its installed hardware need to be described accurately rather than treated as a generic LS3 selection.
What if my L99 has been converted during the cam swap?
Keep the original vehicle and engine identity clear. List the installed cam and lifters, then state whether VVT is retained, limited or locked out. Include the converter and transmission changes so Jason can work from the completed build and its original read.
Can a Camaro LS3 tune be used in a Corvette LS3?
Do not assume that matching engine names makes the whole file interchangeable. Use the actual vehicle and original read for remote tuning; any downloadable reference has its own application requirements.
Does Stage 2 or Stage 3 identify the cam I need tuned?
Use the exact cam card and part number. A stage label alone does not describe duration, lift, lobe separation or the installed hardware. Check the Stage 2 or Stage 3 guide, then review the cam, stage and service charges for your actual selection.
Sources & application notes
Technical references identify the engine and equipment discussed. The builder and original stock read determine the selected application; these specifications are not a power-gain promise.