Derringer L5P Tuner for the 2017-2019 Duramax: Real Power is here!

Banks Power’s latest Derringer inline tuner is now available for the 2017-2019 Chevy/GMC 2500/3500 6.6L Duramax L5P.

The Derringer tuner — When it comes down to it, you want a real L5P tuner. You want something that makes big power and doesn’t kill your truck. After all, you just spent a lot of money on that beast. The Banks Derringer L5P tuner is the only option you should be considering. Look, the other guys claim big numbers and we call bulls—t! We tested every other tuner on the same dyno, same day, same weather conditions, with the same technician… Same damn test, period! There’s only so much you can do by just intercepting the fuel rail pressure sensor. That’s where all the others fall short. The Derringer is the only tuner that actually utilizes your truck’s ECM to make intelligent calculations!

After months of testing, the results are in and we can’t wait to share them.

Check out the data below, followed by Derringer’s jaw-dropping list of features.

Wheel Horsepower - 2017+ GM Duramax L5P 6.6L
Wheel Torque - 2017+ GM Duramax L5P 6.6L
Wheel Horsepower Best Gain - 2017+ GM Duramax L5P 6.6L
Wheel Torque Best Gain - 2017+ GM Duramax L5P 6.6L
Dollars per Horsepower Gain - 2017+ GM Duramax L5P 6.6L
50-70 mph Time - 2017+ GM Duramax L5P 6.6L
Claimed versus Reality - 2017+ GM Duramax L5P 6.6L

NOTE: Dr. Performance and Stealth share the same circuitry. Test vehicle: 2017-19 Chevrolet Silverado 3500 Dually 6.6L Duramax L5P. Factory intake and exhaust. All tests run on the same truck, same day, same conditions. Tested on a Mustang Dynamometer, 10-second sweep.

Banks Derringer with iDash SuperGauge
Banks Derringer with iDash SuperGauge

The Derringer is available as a system with the iDash 1.8 Super Gauge. The Derringer with iDash system is available with data logging and without data logging.

How the Derringer does what it does, and why.
There’s no easy way to make more power your daily driven L5P with GM’s ECM and factory turbo, no magic flash or special “chip” available. We had to go the tuner route, and making an inline tuner for your truck was no easy task. We have almost a thousand man-hours into Derringer development. Fortunately, we’ve been making tuners for 20 years, so we know what we’re doing.

The Derringer is a plug-and-play microcomputer designed for easy installation. It’s waterproof for convenient under hood mounting and connects to the iDash 1.8 Super Gauge for the ultimate information and power selection, unlocking three additional power levels.

Unlike the fixed tuning used by others, the Derringer calibration is continuously adjusting to provide you the peak possible performance under every driving condition. By utilizing the OBD-II data’s power, the tuner intelligently fine-tunes its calibration on the fly without you having to change its power level.

  • Exhaust Gas Temperature (EGT) – The Derringer senses your engine’s EGT and intelligently modulates fueling to maintain a safe maximum EGT, protecting your turbo and engine.
  • Altitude compensation – The Derringer senses ambient air pressure, controlling the turbocharger to maintain added boost and power as altitude increases.
  • Diesel Particulate Filter (DPF) Regen – The Derringer tuner constantly monitors your DPF regen status and will optimize its calibration to ensure the regen process completes successfully.
  • Accelerator Pedal Monitoring – The Derringer senses the accelerator pedal position to roll in additional power progressively, optimizing part-throttle fuel economy and giving maximum power when you ask for it.
  • Coolant Temperature Monitoring – The Derringer senses coolant temp to control added power. During warmup, no power is added below 120° F, and then power is ramped in and fully available above 150°. If the coolant overheats for any reason, the Derringer starts removing its power at 230° F, and additional power is totally removed if you exceed 240° F.
  • Full Power Timer – If set on Sport level, the Derringer allows for 30 seconds of wide-open throttle before transitioning to the recommended power level for sustained tow/haul. (Our research has shown that the stock L5P when at full power, will hit 1450° EGT and, after a minute or so, will pull out fuel to cool things down. So, we do the same thing.)

TransCommand® Active Transmission Safety System
In addition to AutoRate Adaptive Tuning, the Derringer utilizes key engine and transmission parameters to enhance shift performance and improve your transmission’s longevity. Because the competitors lack the essential OBD-II data, they always add power at wide-open throttle—no matter what! This can cause excessive transmission slip, torque converter clutch slip, and even 170 HP engine derates for the transmission to complete the shift. This harms the overall performance and degrades your transmission. The Derringer is meticulously calibrated and extensively tested to modulate power during shifting, optimizing performance, and safety properly.

  • Intelligent Shift Tuning – The transmission shift request signal is monitored to optimize the power level before the shift protecting the transmission, increasing shift speed, and avoiding ECM power derates.
  • Boost and Fuel by Gear – Gear based calibration allows for optimum traction and performance.
  • Torque Converter Clutch Slip Monitoring – The Derringer adjusts to modulate TCC slip to safe levels.
  • Transmission Slip Monitoring – The Derringer adjusts calibration to modulate transmission slip to safe levels

The Derringer is the only tuner on the market to include ‘Active Safety,’ an active failsafe system that utilizes bypass relays to smoothly transition your vehicle to stock power levels in the event of any trouble signs in the Derringer. The system constantly monitors various parameters over 50 times a second to ensure that everything is operating as it should. If any competitive tuners lose power or fail in any way, they will instantly trigger a “limp home” mode where all power is lost, and the vehicle dangerously slows to a crawl. If the same fault condition occurs to the Derringer, it will gracefully remove its additional power and return to stock power levels without a hitch.

  • Internal self-diagnostics checks the health of the system 50 times per second
  • Monitors MAP and FRP signals for out of range condition (disconnected or short circuit)
  • Watchdog timer constantly monitors CPU activity
  • Active safety engages if 12-volt power is lost to the Derringer tuner

Additional Features

  • Simple plug and play installation with easy removal for dealer service
  • Warranty friendly: no reflash required and no traces left in ECM
  • 3 power levels with on the fly level changing (with switch)
  • Rugged, waterproof design
  • LED Derringer status indicator
  • CARB EO applied for

Additional Features with iDash 1.8

  • 6 power levels with on the fly level changing using iDash
  • Optimized Derringer layout to view vital data
  • Regen status displayed over power level when Regen is active
  • Power added bar graph shows Derringer power being added
  • On-screen Derringer Status Indicator
  • Datalog up to 100 Derringer, engine, or transmission parameters through microSD card
  • Corrects MAP and FRP parameter to accurate readings
  • Update Derringer software and calibration through iDash 1.8 using microSD card
  • Expand the system with other Banks Bus products
    • Ambient Air Density Module
    • 4-CH Analog Sensor Module*
    • 4-CH Thermocouple Module*
    • Advanced Water-Methanol Module*
    • More coming soon

*Module coming soon

Banks range of sensor modules for the iDash SuperGauge and DataMonster

Stock L5P Turbo Limits
The factory turbo is done at 505 flywheel hp, that’s a gain of 60 horsepower. Above that point, the turbine drive pressure increases dramatically, as does EGT, and no more boost is available to add horsepower safely. Anyone who claims to deliver more doesn’t understand this engine.

  • Derringer connects to your OBD-II port. It sees the whole picture.
  • After thousands of man-hours on the dyno and crunching data in the engineering office, we had the best gains – 61 hp and 112 lb-ft of torque to the wheels.
  • Derringer delivers 505 hp and 1001 ft-lb of torque at the flywheel!
  • Only $479. Less than $8 per hp

The Derringer L5P tuner is the most sophisticated inline tuner available for the Chevy/GMC 2500/3500 6.6L Duramax L5P. We hope you have as much fun driving with it as we did making it.