DemonWorks Tests Derringer & PedalMonster on L5P Duramax

00:00 Today we are fixing one of the biggest issues with the 6.6 Duramax diesel. This is the L5P ZR2. This is the 2500. Now what we have here is a PedalMonster kit. We’ve got the Derringer High Output which comes with the iDash — which I absolutely love. That’s the Dash Pro.

00:16 And then we also have the Stealth Pod that we’re going to be installing on this 2025 Silverado 2500. What we’re going to do is install that today, mount up that gauge, set it all up, and then do a little comparison of stock versus modified.

00:30 First off, let me tell you how I got this truck because I know you’re like, “I’m on a 3.0 Duramax Diesel channel, and all of a sudden, you have a 6.6 Duramax sitting in your garage?” Let me tell you — this is a buddy of mine. He’s owned this for a couple months.

00:41 He’s talked to me about how when he goes to tow, there are some dead spots on the truck, and also when he accelerates off the line. And so, I told him, “Dude, Banks has this awesome setup. The Banks iDash is going to show you everything on the screen just like I have on my truck, and you’re going to be able to control all of this stuff right there.”

00:55 The extra power from the High Output Derringer can be used in multiple settings — there are six total. One being stock, six being the most powerful. What that does is it focuses on the 2200 to 2800 RPM range, which is effectively where you want the most amount of power because that’s where you’ll be sitting most of the time when accelerating up a hill or passing a vehicle — towing or daily driving.

01:13 Now, off the line, these trucks are notorious for their laggy throttle feel because of turbo lag. GM has done a great job introducing newer turbos that work better, but the problem is that this is still a big engine with a big turbo. So, there’s going to be lag inherently in there.

01:25 They also tune that into the throttle pedal, which is just silly — it makes it feel dead. So, with the PedalMonster installed, we’ll be able to adjust what we want as far as off-the-line power and how aggressive we want to get with it.

01:41 That’s up to him because ultimately it’s his truck. But I drove this truck from his house to here, and I’ll tell you — I noticed the lag. Another reason I have this truck is because I’m going to be doing a comparison of the 2500 and my 1500. Both are ZR2s, both are diesels. They both have tremendous torque, but I’ll do a comparison in a later video, so be sure to check that one out.

02:11 Now that I’ve unboxed everything, we’ve got the goodies laid out — you can see the Dash Data Pro there. What we need to do is update it, but we can’t update it until it has power and is installed. So don’t try to do any power mods before you update that.

02:24 I’ll show you how I do that — I’ll connect through my phone and update it. This is the harness we’re going to string across the engine bay to see where it needs to go. Then we’ll plug it in. This is the PedalMonster here — it’s going to go below by the accelerator pedal.

02:50 All of this taps into the back side of the gauge. Like I said, we’ll control it through the app. Once updated, it’ll be fully controllable — buttons on there, super easy. Then we’ll do some driving to show the difference between stock and modified.

03:01 I started spreading out this harness, but realized my wheel legs couldn’t get me up there. I had to grab a kitchen stool — embarrassing, I know. This truck is massive. We’re going to route it through the fender well. The toughest part will be tapping into injector #2 — that’s how the Derringer reads pulse width feedback.

03:46 We’ll mount the Derringer module right there. All right, let’s start getting these in line.

04:21 Before getting too carried away, I keyed on the ignition to power up the Banks iDash. Plugged into the OBD2 port, set it up, connected to the Dash Pro, and started the update.

05:13 Once that powered up, I went into the Banks app, connected to the iDash, and started the firmware update. Remember — you can’t exit the app or turn off the vehicle during the process.

06:10 To silence the annoying chime, I used a screwdriver to trick the truck into thinking the door was closed.

06:40 The update finished — I reconnected the Dash Pro, changed the color scheme to something cleaner (white and black), and continued with the install.

07:10 Next, I removed the A-pillar. Don’t drill with the pillar still on — there are airbags back there. I ran cables through the door, routed them up through the pillar hole, and prepared for the Stealth Pod install.

07:37 Then I started wiring in the PedalMonster, which connects under the accelerator pedal. Zip-tied everything neatly to keep it clear of your feet.

08:22 Routed the Derringer harness down to the grommet and into the cabin — connected everything but didn’t zip tie yet since we’ll test functionality first.

10:22 Next, I paired the PedalMonster. Press the button on the back of the module to enter pairing mode — blinking orange means it’s ready. Connected via the Banks app and updated firmware again.

11:21 Calibration time — must be in park, engine off. Go full throttle, then off. Super easy, took seconds.

12:12 After calibration, I confirmed the Derringer and PedalMonster were recognized by the iDash. Everything was reading perfectly.

13:03 Drilled the pillar for the Stealth Pod, routed the harness, and reinstalled everything. The wiring is clean — nothing rubbing, burning, or dangling.

14:06 Fired up the truck — runs perfectly. Cleared check engine codes through the iDash diagnostics menu.

15:32 Once all codes cleared, I loaded the “Derringer & PedalMonster” gauge layout. You can now adjust PedalMonster sensitivity and Derringer power level directly on the gauge.

16:14 Reverse mode works flawlessly — it automatically reverts to stock throttle sensitivity for safety.

19:02 With everything installed, I took it for a drive. At stock settings, the throttle lag was very noticeable — just like my friend described.

20:33 Switched the Derringer to level 3 — noticeable increase in passing power and throttle response. Turbo spools faster, stronger midrange.

23:04 Now time for the PedalMonster — set it to Sport mode. The throttle response instantly improved.

24:36 There’s still a bit of turbo lag — it’s a big engine — but the feel is drastically better.

25:28 Rolling throttle now feels smooth and lively. Night and day difference.

26:07 I love the PedalMonster for this truck — it transforms drivability without touching the tune.

26:46 Barely pressing the pedal, you get immediate feedback. This setup fixes the sluggish throttle and makes the truck way more fun to drive.

27:04 Overall, total success. My buddy’s going to think it’s a completely different truck. Stay tuned for my next video comparing this 2500 ZR2 to my 1500 ZR2 Duramax — because yes, I compare them both.