THIS IS WHERE DYNCAL STARTED.

Before Dyncal. Before diesel tuning became the industry it is today. Before everybody with a laptop called themselves a tuner.

There was Me.

I've been pushing, testing, racing, breaking, fixing, and tuning Duramax trucks since 2008 — back when EFI Live Duramax tuning was still new territory.

I built a reputation in the Duramax world the old-fashioned way: by doing it, proving it, and setting records along the way.

That experience is behind every Duramax tune we build today.

YOUR DURAMAX. OUR TUNING.

Our Custom EFI Live Duramax Tuning is built in-house for your specific truck, modifications, and intended use.

No generic one-size-fits-all file.

Choose from multiple power levels and either a Single Tune or DSP5 tuning with five selectable tunes available right at your fingertips.

CP3 conversion tuning is also available for supported 2011+ Duramax applications.

FIVE TUNES. ONE SWITCH.

Go DSP5 and completely change the personality of your Duramax without having to reflash the ECM every time.

Turn the switch. Pick your tune. Let it eat.

DSP5 gives you up to five selectable tunes on the fly, so you can have different power levels and setups ready whenever you want them.

A DSP5 switch is required for DSP5 tuning. If your truck already has one, you're good to go. If not, we offer DSP5 switches separately.

BUILT BY A DURAMAX TUNER. NOT A TUNE RESELLER.

There's a difference between selling tune files and actually knowing how to tune a Duramax.

We've been doing this for nearly two decades.

From the early EFI Live days to today's trucks, the knowledge behind Dyncal comes from years of hands-on Duramax tuning, testing, competition, and figuring out what actually works.

I didn't show up yesterday.

And we're damn sure not learning on your truck.

- Tunergeek

WANT THE ALLISON DIALED IN TOO?

Don't forget about the other half of the equation.

Custom Allison transmission tuning is available separately for supported applications.

Power is good.

Power with a transmission that's ready for it, is better.

HOW IT WORKS

Build your tune by selecting your truck and desired options when ordering.

Once we have the information we need, we'll build your custom tune file and deliver it electronically.

You'll then use EFI Live software and a compatible EFI Live device to flash the tune into your truck.

IMPORTANT — THIS IS TUNING ONLY

This product includes the custom tune file only. An EFI Live device is NOT included.

You must have a compatible EFI Live device to flash the tune into your vehicle.

Using an EFI Live AutoCal? Your AutoCal must be linked to Dynamic Calibration before our tuning can be installed. If it's currently linked to another tuner, contact us and we'll help you figure out what needs to happen.

You may also need an available EFI Live VIN license for your vehicle.

Don't have an EFI Live device? We offer EFI Live AutoCal V3 packages with Duramax tuning pre-installed and ready to flash.

DURAMAX TUNING SINCE 2008.

BUILT BY Tunergeek. POWERED BY DYNCAL.

Flash it. Switch it. Stand on it.