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Gale Banks comparing competitive diesel inline tuners vs the Banks Derringer on the dyno
Banks Insider, Banks Videos, iDash Pro, iDash Pro, Tuner

Inline Tuners vs Derringer: Real Diesel Safety

In Gale Banks’ latest video, he dives into a critical topic: the risk of using unsafe inline tuners vs the Derringer. While some tuning boxes may look like a great deal, the damage they can do to your diesel engine could cost thousands—making any savings meaningless.

What makes the Banks Derringer different? It’s not just performance—it’s protection. Unlike many generic tuners, the Derringer inline tuner includes active safety systems that monitor parameters like exhaust gas temperature, transmission slip, and fuel rail pressure. Without these protections, inline tuners can cause severe engine damage under load or in towing situations.

Banks Derringer tuner module with iDash SuperGauge in-cab digital display
The Banks Derringer connects via OBD-II to provide 6 on-the-fly power levels and active safety monitoring.

The Derringer tuner with iDash is currently available for:

Full Video Transcript

00:00 I’m Gail Banks. Over the next few minutes, I’m going to explain why the Daringer is the only inline tuner you should consider for your Ford 67 Superduty. All the others belong right here. The Daringer is the only smart tuner available because it has OBD connectivity that allows it to safeguard

00:24 your truck and it delivers the power that it promises. We bought and tested all the competitive tuners on the same truck, on the same day, in the same weather, on the same dyno, and over the same road. AF AG TS Performance Stealth stock, we’ve got 389 horsepower at the

00:46 road surface. For those of you looking at buying the Daringer, the peak for you guys, 443 horsepower and a best gain of 59 horsepower. The AF Scorcher, best gain of 33. TSMP8, best gain of 26 horsepower. The Stealth, 24 horsepower, best gain. And then we get to AG Diesel.

01:08 And this falls under the heading of did they actually put in additional fuel? 14 horsepower, best gain. Why bother? Daringer is the only smart tuner available. So, what makes it smart? This OBD cable. It’s what connects a Daringer to your truck’s ECU, allowing it to tune

01:27 dynamically. The Daringer is the only tuner on the market to include a watchdog circuit. When everything is working as it should, the signals flow through the relays, get processed by the Daringer CPU, and then flow out to the truck’s ECU. But if the daringer senses

01:46 an issue or loses power, it goes into failsafe mode where it seamlessly returns your truck to stock power. We’ve got our first test. We put in stealth. Let’s go see what happens. I’m going to floor it and turn off the 5V powering the board in the unit. Now, let’s accelerate this thing

02:09 up 3,000 RPM. I’ll flatoot it. Whoa. Accelerator pedal is totally dead. There’s nothing. Absolutely nothing. The engine just shut off. I’ve got the daringer installed now. Once again, 2500 RPM. Punch it. Whoop. Still pulling. And I’m running into this guy in front of

02:37 me. Didn’t fail. Still running with stock power. I can turn the box back on and we got a lot more power. That’s what I call a good test of a failsafe system. So, if you’re looking for power, efficiency, reliability, and safety, there’s no other tuner like the Daringer. Can I get somebody to take out

02:57 the trash?

CAN-Bus Watchdog Architecture: Inline Tuners vs Derringer

Generic inline tuners operate as crude analog signal modifiers. These devices splice into sensor wires to falsify fuel rail pressure. Because they lack OBD-II connectivity, they cannot read actual engine operating conditions. They remain completely blind to coolant temperatures, transmission slip, and exhaust heat. When towing up steep grades, these dumb boxes continue injecting fuel into heat-stressed cylinders. This uncontrolled fueling leads to melted pistons, damaged injectors, and burned transmissions.

The Banks Derringer functions as an intelligent microcomputer connected to high-speed CAN-bus data. It actively monitors vital powertrain parameters and adjusts calibration automatically in real time. If exhaust gas temperatures rise or transmission clutches slip, the Derringer trims power safely. Furthermore, it features a physical hardware watchdog circuit with electromechanical relays. If the module ever loses power, it seamlessly restores stock factory operation without stalling your truck.

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