Texas Speed Cam Tune Center
Chopacabracam tune.Matched to your build.
The Texas Speed Chopacabra is popular because it delivers the sound and power truck owners want. Making it start cleanly, idle in gear and drive correctly still requires the tune to match the engine generation, exact cam, controller and installed hardware.
- Texas Speed cam-specific tuning
- GM LS, EcoTec3 and supported HEMI
- Custom, Base and downloadable paths
Step 1 · Choose The Engine Family
Same nickname.
Different tune strategy.
Texas Speed offers platform-specific Chopacabra cams. Match the exact part number, engine generation, controller and hardware before choosing a tune or downloadable file.
Gen III LS
4.8L, 5.3L and 6.0L P01/P59 truck and SUV combinations with vehicle-specific airflow and drivetrain details.
Gen IV LS
Truck, SUV and supported car combinations requiring exact DOD/AFM, VVT, converter and transmission information.
Gen V EcoTec3
Direct-injected L83 and L86 builds where AFM hardware, phaser setup, fuel and torque behavior must match.
HEMI Applications
5.7L and 6.4L applications with exact PCM, security, MDS, VVT, transmission and cam-version requirements.
Include the manufacturer part number or cam card. Platform-specific Chopacabra versions can have different valve events, phaser requirements and supporting hardware even when the marketing name is the same.
Build your truck’s tune
Choose your Silverado or Sierra, then select the exact year, engine, camshaft, transmission and drivetrain. The builder calculates the service price for your combination.
2003–2006 Silverado 1500 5.3L tuning
Configure your tune2014–2018 Silverado 1500 5.3L L83 tuning
Configure your tune2014–2018 GMC Sierra 1500 5.3L L83 tuning
Configure your tuneMatch The Platform. Match The Cam. Build The Tune.
After identifying the engine family, select the exact vehicle, Chopacabra camshaft, transmission, drivetrain and installed hardware. The live builder separates GM and HEMI combinations and routes the build to the correct tune or downloadable file.
Build The Exact Combination
Year, make, model, engine, cam, transmission, drivetrain, tune type, and modifications use the live homepage mapping.
Enter the specifications shown on your cam card. Durations must be measured at .050-inch tappet lift—not advertised duration.
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.
Supporting every possible vehicle, cam, and modification combination would require more than 14,000 separate files, so modification support is not currently offered with downloadable files. 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 exact product page to review its description and compatibility, confirm all seven requirements, and add it to your cart.
No closest file will be substituted. Choose a tune built from your own vehicle file instead.
Year → Make → Model → Engine → Camshaft → Tune Type → Modifications or Download Limits → Buy
- Vehicle
- —
- Engine
- —
- Transmission / Drivetrain
- Not Provided / Not Provided
- Cam
- —
- Tune Type
- —
- Modifications
- —
- Blowers
- LSA: No / Hellcat: No
- Total
- —
Important — Please Read How Remote Tuning Works
Remote tuning has to be done one step at a time. It is not always as simple as sending one file and being finished. A lot of things can affect how fast the process goes: the condition of the vehicle, mechanical issues, whether the data log shows the issues, how many modifications the vehicle has, how quickly we can communicate back and forth, my current workload, and any unexpected problems we run into along the way.
J.R. Jones Racing LLC is an owner-operated, one-person business. I am the only person tuning, reviewing data logs, answering phone calls and text messages, and helping customers. I also do all of the work behind the scenes to build and maintain everything we use, including the website, customer portal, servers, coding, programming, integrations, and continued development. I personally handle every tune. Later revisions and the overall tuning process depend on the work involved, customer feedback and current workload; they have no fixed completion deadline. The Revision 1 guarantee applies only to delivery of the initial file after JRJ receives your stock read. It does not guarantee a completion date for the entire tuning process or a deadline for later revisions. Contact JRJ through the Tune Portal if the promised initial delivery is missed; it will be reviewed as a service issue.
Please read the complete remote tuning checklist and process before you begin. We have to work forward one step at a time. That has proven to be the safest and most efficient way to do this. If we skip steps or try to change too many things at once, it can slow everything down and make us work backward.
Step 3 · Understand The Tune Paths
Sound is easy.
Drivability takes work.
Choose Full Custom when the build needs logs and refinement, Base when you need a controlled starting point, or an exact-match download when every listed requirement is confirmed.
Full Custom Remote Tune
Built from your stock read with datalog review and revisions for supported Chopacabra combinations.
From $269.99- Cold and hot startup
- Idle in Park and in gear
- Airflow, fueling and torque
- Up to five revisions
Base Start / Idle Tune
Built from your stock read to establish startup, idle and initial drivability with one revision.
From $169.99 · One revision- Startup airflow foundation
- Initial idle behavior
- One included revision
- Upgradeable to Full Custom
Downloadable .HPT File
Prewritten file for a confirmed exact year, engine, controller, OS, cam and hardware match.
$99.99- Instant digital delivery
- Check listed compatibility
- No custom revisions
- Use your own stock read
What the tune addresses
Clean up the behavior.
Keep the attitude.
A properly matched Chopacabra tune should preserve the cam’s character while improving the software-side issues created by its changed airflow and torque behavior.
Starts Then Dies
Cold and hot startup airflow, cranking behavior and the transition into running airflow.
Surge / Hunting
Idle airflow, idle spark and the closed-loop control behavior that can make RPM wander.
Stalls Into Gear
In-gear airflow, desired idle, converter load and supported transmission behavior.
Rich / Lean Trims
MAF and VE behavior, injector data, exhaust leaks and the cam’s low-speed reversion.
Slow RPM Return
Throttle follower, airflow decay and torque behavior that can make RPM hang during deceleration.
Poor Shift Feel
Supported shift strategy, torque delivery, tire size, axle ratio and converter changes.
AFM / MDS / VVT
The tune must agree with the lifters, cam gear, phaser, limiter or lockout that is physically installed.
Mechanical Problems
A tune cannot repair vacuum leaks, incorrect cam timing, failed lifters, low fuel pressure or installation faults.
Direct product paths
Pick the generation.
Then verify the match.
These broad tune products are separated by engine generation. Exact-match downloadable products remain in the searchable .HPT library.
Gen III Chopacabra Tune
For supported 4.8L, 5.3L and 6.0L combinations using the correct stock read, controller and hardware.
Open Gen III product ↗Gen IV Chopacabra Tune
For supported Gen IV combinations with exact engine, DOD/AFM, VVT, transmission and converter details.
Open Gen IV product ↗Gen V Chopacabra Tune
For supported L83 and L86 direct-injected builds with complete AFM, VVT/phaser and fuel information.
Open Gen V product ↗5.7L Chopacabra File
Exact-match Compare & Copy file for the listed HEMI vehicle, controller, OS and cam configuration.
Check the 5.7L file ↗6.4L Chopacabra File
Exact-match Compare & Copy file for the listed 6.4L HEMI hardware and operating system.
Check the 6.4L file ↗Find the Exact Chopacabra .HPT
Search by year, engine generation, displacement and cam when the complete combination is already known.
Search all downloads ↗Before the first file
What JRJ
needs from you.
Accurate build information prevents the tune from being based on assumptions.
Straight answers
Chopacabra
FAQ.
Use the Tune Builder when the exact cam version, engine generation or hardware status is not clear.
Back To Tune Builder ↑Can JRJ tune a Texas Speed Chopacabra cam?
Yes, for supported vehicles and controllers. Provide the stock read, exact cam part number or cam card and complete hardware details.
Is every Chopacabra camshaft the same?
No. Texas Speed offers platform-specific versions. Do not choose a tune using only the Chopacabra name.
Do I need an aftermarket converter?
That depends on the exact cam, transmission, vehicle weight, gearing and intended use. Send the converter brand, part number and advertised stall if one is installed.
Does DOD, AFM, MDS or VVT need to be deleted?
The tune must match the hardware actually installed. State whether cylinder-deactivation hardware is retained or mechanically removed and whether VVT is retained, limited, locked or deleted.
Can I buy an instant Chopacabra .HPT file?
Only when the product exactly matches the vehicle, engine, controller, operating system, camshaft and listed hardware. Otherwise choose a tune built from your stock read.
Will tuning fix a failed lifter or bad cam installation?
No. Tuning cannot repair failed hardware, incorrect mechanical timing, vacuum leaks, fuel-pressure problems or installation faults.
Keep the chop. Fix the behavior.
Make it sound mean.Make it drive clean.
Match the real engine, cam and hardware first. JRJ will route the build to the correct Full Custom, Base or exact-match downloadable tune.