GM Custom ECU & Transmission Tuning
Drivability-first custom tuning for GM trucks, SUVs, cars, and swaps. Performance you feel on every mile — not just at wide-open throttle.
How We Tune
Most tuning shops focus on peak horsepower numbers. We focus on how the vehicle drives. A proper tune transforms the entire experience — idle quality, throttle response, shift behavior, cruise, towing. You should feel the difference every time you drive, not just when you're at wide-open throttle on a dyno.
Every tune is custom-calibrated to your specific vehicle, modifications, and driving needs. We don't use canned files or one-size-fits-all templates. We review your setup, build the calibration from scratch, and refine it based on your data logs until it's dialed.
Custom Engine Tuning
Full calibration work across the entire operating range — not just a WOT fueling pass. Every tune addresses the areas that matter most for daily driving and real-world performance.
Fuel Calibration
VE table and MAF calibration built to your injectors, intake, cam, and headers. Closed-loop and open-loop fuel targets optimized for your setup.
Spark & Timing
Spark advance tables calibrated per-cylinder if needed. Knock sensor tuning, spark vs. load curves, and fuel-quality-specific timing (87, 91/93, E30, E85).
Torque Management
Torque reduction tables adjusted to eliminate unnecessary throttle blade closure and spark retard during shifts — cleaner, faster shifts without the jarring cutback.
Idle & Part-Throttle
Idle airflow, idle spark, and throttle follower tables tuned for a stable, smooth idle — even with aggressive cams. Part-throttle response shaped for your driving style.
Cooling & Fan Control
Fan activation temperatures, AC fan staging, and coolant strategy adjusted for your climate and cooling setup. Keeps temps in check without running fans unnecessarily.
Speed Limiter & Rev Limiter
Top speed limiter removed or raised. Rev limiter adjusted to match your cam profile and valvetrain. Tire-size-based speedo correction included.
Additional Engine Calibration Options
Flex Fuel Enable — Enable E85 or flex fuel capability on supported platforms. Fuel, spark, and injector scaling calibrated for ethanol blends from E0 to E85.
AFM / DOD Disable — Disable Active Fuel Management / Displacement on Demand to eliminate lifter tick, oil consumption, and the rough V4/V8 transition. Full-time V8 operation with recalibrated fuel economy tables.
VVT Calibration — Variable Valve Timing cam phaser tables tuned for your cam profile. Critical for aftermarket cam swaps on VVT-equipped engines.
MAF Sensor Rescale — Recalibrate the MAF transfer function for aftermarket intakes, larger MAF housings, or LS swap MAF conversions.
Injector Scaling — Flow rate, offset, and short pulse width tables updated for aftermarket injectors. Proper scaling is the foundation of accurate fueling.
Transmission Tuning
Transmission calibration is where most tunes fall short. Factory shift logic is tuned for emissions compliance and NVH targets — not for how you actually drive. We recalibrate shift timing, line pressure, torque converter clutch (TCC) strategy, and converter slip targets to match your powertrain and driving conditions.
Shift Point Calibration
Shift schedule tables reprogrammed for your gear ratio, tire size, and power output. Upshift and downshift points tuned to keep the engine in the powerband where it belongs.
Line Pressure
Increased line pressure for firmer, more positive shifts. Critical for high-torque applications. Calibrated per-gear to balance firmness and longevity.
TCC Lockup Strategy
Torque converter clutch lockup and unlock points adjusted for your gear ratio and tire size. Eliminates lugging on light throttle and improves fuel economy at cruise.
Converter Slip Management
Slip targets calibrated to your torque converter — stock or aftermarket. Proper slip management means smoother TCC engagement and less heat buildup.
Supported Transmissions
| Transmission | Common Applications |
|---|---|
| 4T65 | FWD GM cars — Impala, Grand Prix, Monte Carlo, LeSabre |
| 4L60E | GMT800 trucks, Camaro, Corvette, S-10, Trailblazer |
| 4L80E | HD trucks, Suburban, Express, swap builds |
| 6L80 / 6L90 | GMT900 trucks, Camaro, G8, CTS-V, Trailblazer SS |
| 8L90 | K2XX trucks (2014+), Corvette C7, Camaro SS |
| 10L80 | T1XX trucks (2019+), Camaro ZL1, CT5-V |
| 68RFE | Ram HD trucks (Mopar) |
Supported Engine Platforms
| Platform | Engines | Notes |
|---|---|---|
| Vortec | 4.3L V6, 4.8L, 5.3L, 6.0L, 8.1L | Gen III iron/aluminum block; Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche, Express, Savana, Astro, Safari, S10, Sonoma, Blazer, Jimmy, Escalade |
| LS Gen III | LS1, LS6 | Corvette, Camaro, Firebird/Trans Am, GTO, CTS-V |
| LS Gen IV | LS2, LS3, LS7, L76, L77, L92, L99 | VVT/AFM and non-VVT variants; Corvette, Camaro, CTS-V, G8, SS, Caprice PPV, Trailblazer SS, SSR, Silverado, Sierra, Tahoe, Yukon, Escalade |
| LT Gen V | LT1, L86, LT4, L83, L87 | Direct injection — requires DI-specific calibration; Corvette, Camaro, CTS-V, CT5-V, Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade |
| Vortec I6 | 4.2L LL8 (Atlas) | Trailblazer, Envoy, Rainier, Ascender, Bravada, Saab 9-7X |
| 3800 V6 | L36, L67 (supercharged), L32 (supercharged) | Grand Prix, Impala, Monte Carlo, Bonneville, Regal, Riviera, LeSabre, Park Avenue, Lucerne, Firebird, Camaro, Intrigue, Lumina |
| 3400 V6 | LA1, LNJ | Grand Am, Alero, Impala, Monte Carlo, Venture, Silhouette, Montana, Aztek, Rendezvous |
| V6 (High Feature) | 3.6L LFX/LGX, 3.0L LF1 | Camaro, ATS, CTS, CT4, CT5, Colorado, Canyon, Equinox, Terrain, Traverse, Acadia, Enclave, Impala, LaCrosse, SRX, XT5, XT6, Blazer |
| Turbo L4 | 2.0T LTG, 2.5L LCV | ATS, CTS, CT4, Malibu, Equinox, Terrain, Colorado, Canyon, Regal, Envision, Traverse, Blazer, Acadia |
| Ecotec L4 | 2.2L L61, 2.4L LE5/LE9 | Cobalt, HHR, Malibu, Ion, G5, G6, Aura, Vue, Equinox, Terrain, Verano, Sunfire, Cavalier, Alero, Grand Am, Captiva Sport |
| Duramax V8 Diesel | 6.6L LB7, LLY, LBZ, LMM, LML, L5P | Silverado 2500HD/3500HD, Sierra 2500HD/3500HD, Express, Savana, Kodiak, Topkick |
| Duramax I4/I6 Diesel | 2.8L LWN, 3.0L LM2, LZ0 | Colorado, Canyon, Express, Savana, Silverado 1500, Sierra 1500, Tahoe, Yukon, Suburban, Escalade |
| Gen I / Mark IV-VI V8 | 5.0L L03, 5.7L L05/L98, 7.4L L19/L29 | TBI or early MPFI; C/K Trucks, G-Vans, Camaro, Firebird, Corvette, Caprice, Roadmaster |
| Gen II LT V8 | 5.7L LT1, LT4, 4.3L L99 (V8) | 0411 PCM swap supported — replace factory OBD-I/OBD-II controller with P01 0411 for full tuning capability; Corvette, Camaro, Firebird, Impala SS, Caprice, Roadmaster, Fleetwood |
| Atlas I4 / I5 | 2.8L LK5, 2.9L LLV, 3.5L L52, 3.7L LLR | Colorado, Canyon, Hummer H3, Isuzu i-Series |
| High Value V6 | 3.5L LX9/LZ4, 3.9L LZ9/LGD | 60-degree OHV; Impala, Monte Carlo, Malibu, G6, Aura, Uplander, Relay, Terraza, Montana SV6, Lucerne |
| Small Ecotec (Family 0/SGE) | 1.4T LUJ/LUV/LE2, 1.8L LUW/LWE | Cruze, Sonic, Trax, Encore, Spark, Volt (Range Extender) |
| Northstar V8 | 4.6L L37/LD8/LH2, 4.4L LC3 (Supercharged) | DeVille, Seville, STS, DTS, SRX, XLR, Bonneville GXP, Lucerne CXS |
Swap & Conversion Tuning
Engine and transmission swaps need more than just a performance tune — they need the calibration rebuilt to match the new combination. We handle all the integration work that makes a swap actually drivable.
Axle Ratio & Tire Size Correction — Speedometer, shift points, TCC lockup, and torque management recalibrated for your actual gear ratio and tire diameter.
Transmission Swap Support — 4L60E to 4L80E, 4L80E to 6L80, manual-to-auto, and other common swap combinations. Includes shift logic, line pressure, and TCC calibration for the new trans.
Security System Delete — VATS, Passlock, and SKIM delete for swap builds where the original security system is no longer present or compatible.
PCM Swap & OS Migration — Running a different PCM than the vehicle came with? We handle OS compatibility, VIN programming, and recalibration for the new controller.
MAF / Speed Sensor Conversion — Scaling for different MAF sensors, VSS sources, or signal conversions required by your swap.
0411 PCM Swap (Gen II LT1/LT4) — Replace the factory OptiSpark-era PCM with a P01 0411 controller for full LS-style tuning capability. Includes calibration, VIN programming, and security delete. Turns an otherwise limited OBD-I platform into a fully tunable setup.
How Mail-Order Tuning Works
We tune customers nationwide. You don't need to be local — here's how the process works with HP Tuners.
Contact Us With Your Setup
Tell us your vehicle, engine, transmission, modifications, and what you want out of the tune. We'll confirm pricing and what we need from you.
Read Your PCM & Send the File
Using HP Tuners VCM Suite, read your PCM's current calibration and email us the file. If you don't have HP Tuners, we also offer Buy-A-ECM options where we ship you a pre-programmed module.
We Build Your Tune
We build the calibration for your specific combination — not a canned file, not a template. Every table is set for your hardware.
Flash, Log, Revise
You flash the tune, drive it, and send us data logs. We review the logs and send revisions. This cycle repeats until the tune is dialed — idle, part-throttle, cruise, WOT, and transmission all verified.
Done — Drive It
Once the logs are clean and you're happy with how it drives, the tune is finalized. If anything changes down the road (new mods, different fuel), we can revise.
Recent Tuning Examples
Tuning Pricing
| Service | Starting At |
|---|---|
| Custom Engine Tune (mail-order, includes revisions) | Contact for pricing |
| Engine + Transmission Tune | Contact for pricing |
| AFM / DOD Delete Tune | From $150 |
| VIN Change / Programming | From $100 |
| Module Cloning (mail-in) | $150 |
| Buy-A-ECM (pre-programmed, shipped to you) | Varies by platform + core |
All mail-order tunes include revisions until the tune is dialed. We don't charge per-revision — we charge per-job and work until it's right.
Ready to Get Your Vehicle Tuned?
Tell us about your vehicle, mods, and goals — we'll get you a quote and a plan.