Ever heard someone swear a big diesel dyno number has to be fake? On this episode of the Power Driven Podcast, Todd, Will, and Myer take on the dyno slap myth and get into what really separates the guys making serious diesel horsepower from everybody else. Spoiler: it’s not cheating, it’s obsession.

The guys break down why certain people become the go to experts on one Cummins platform, whether that’s a first gen, a VP44 2nd gen Cummins, or a P pump 12 valve Cummins. Seat time on one diesel engine teaches you things no forum post ever will, like a VP44 builder finding real horsepower differences just by swapping ECMs.

You’ll also hear a great 12 valve troubleshooting story from a recent event. A 1995 Dodge Cummins lost its tach and speedometer, and after 40 minutes with a wiring diagram, the culprit turned out to be a pulled fuel pump fuse in the PDC. On a 95, that fuse also feeds the PCM, so pulling it to “delete” a lift pump that was never there killed the computer.

Then the crew gets into diesel dyno strategy and why dyno slapping isn’t real. Myer explains how his Cummins nitrous kits are staged about 200 rpm apart with fuel ramping in over roughly 1,000 rpm. He opens the wastegates ahead of the spray to keep boost and drive pressure in check, and repeatable dyno runs that line up with the math prove the numbers are legit. They also cover how overfueling a big turbo diesel setup cools the exhaust and snuffs the turbo, and how to set up an AFC on a hot 12 valve so it doesn’t hit full fuel too early.

Myer’s 48RE transmission has been a big part of his season at the Ultimate Callout Challenge (UCC), diesel drag racing events, and dyno days. As far as the crew knows, it’s holding more power than anyone has put through a Turbo 400, and the only maintenance on the truck all year has been an oil change. They explain how transmission slip can scatter an engine and why a Bosch ECM that thinks fast enough is worth every dollar over a factory 849.

You’ll also hear why a 6.4 deck plate isn’t automatically the right call over a 6.7, why common rail diesel trucks dominate turbo limited classes like 72 fast, and the small details that win dyno days: chains instead of loose straps, rear lockouts, a spool, a weight rack, and where the tire sits on the roller.

To wrap it up, a listener writes in to settle the EGT versus EGTs debate once and for all.

If you’re into Cummins builds, diesel performance, diesel tuning, and making real horsepower, subscribe on YouTube and follow the Power Driven Podcast on Spotify, Apple Podcasts, or wherever you listen.

Whether you’re chasing your first 1,000 horsepower out of a P pump 12 valve or building a Cummins that can survive serious dyno abuse, the parts and know-how behind this episode are available at PowerDriven.com. 

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