5.9L Cummins Stealth STR vs Stock Turbo! Horsepower, Spool, Towing, Boost, EGT, DrivePressure & More

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Published 2024-01-19

05:23 Tow Test
22:51 Spool-up Test
25:51 Peak Power Test

Nick Priegnitz and the Calibrated Power / DuramaxTuner's R&D team dive into the most extensive turbo testing and analysis for the 2003-2007 5.9L Cummins. Using our chassis dyno, EFiLive Tuning, and 20+ years of experience, Nick compared a Stock, Stock w/Wastegate Mod, and the 5.9L Cummins STR turbo on our 2007 Ram 2500 HD. Nick chose to monitor and log data utilizing the Gale Banks (Banks Engineering) iDash and our in-house Mustang Dyno.

Nick covers the details we found through days of dyno testing. Air-to-Fuel-Ratio, Drive Pressure, Shaft Speed, EGT, Boost, Towing Performance, Spool-up, and of course peak horsepower (with and without lambda limits) are all broken down in an easy-to-follow and easy-to-understand format.

To shop for the 2003-2004 Cummins 5.9L STR click here: duramaxtuner.com/turbo-chargers/3rd-gen-stealth-st…

To shop for the 2004.5, 2005, 2006, and 2007 Cummins 5.9L STR click here: duramaxtuner.com/turbo-chargers/3rd-gen-stealth-st…

Here's the link you've been waiting for: The blog with the data and results from the STR, Mach 1 (Stealth 64), and Mach 2 (Stealth 67)
blog.duramaxtuner.com/blog/5.9l-3rd-gen-cummins-tu…

All Comments (21)

@Duramaxtuner 5 months ago

Here's the link you've been waiting for: The blog with the data and results from the STR, Mach 1 (Stealth 64), and Mach 2 (Stealth 67) blog.duramaxtuner.com/blog/5.9l-3rd-gen-cummins-tu…
@nahrens223 5 months ago

To my knowledge, you guys, banks, and power driven are the only ones putting out any real meaningful info to us diesel performance enthusiasts that wanna keep this form of motor sports alive and well for years to come. Keep it up guys!!
@johnnystanley4469 5 months ago

Nick and the Calibrated power team taking it to another level.
@benwhittaker8630 5 months ago

Thanks for the absolute transparency. I enjoy watching Gale Banks, but sometimes find it frustrating when he says all black smoke is wasted fuel. I understand where he's coming from and support the idea of running clean, I hate people "rolling coal", but I'm glad you've shown why it's done in competition. For MOST non-nitrous setups, you will see absolute peak power with significant soot or of the pipe. It's not wasted fuel, they aren't "bad" tuners, there is a time and place for it. It's refreshing to see people in the industry sharing information openly. Can't wait to see the next round of data comparing the bigger charges.
@brighamwilde2653 5 months ago

I love this! This is absolutely the kind of thing I would do if I had a dyno! Thanks for sharing real data! Can't wait for access to all of the spreadsheets for this whole project.
@Spencersmithfilm 5 months ago

This was great, very insightful. Thanks for putting this one together gentlemen.
@HunterSkiff 5 months ago

2024 starting off with a banger. Loved this
@hadenjohnson2183 1 month ago

Great video guys, I absolutely love all the info!
@jacksonsummers8220 4 months ago

How does this video not have millions of views it definitely deserves it!
@Ozgrade3 21 days ago

Durmax Tuner, Banks Power, WC Fab et al. Engineering & Manufacturing in America is doing just fine.
@highdesertjohn 5 months ago

This is fun and very useful stuff. Thanks for the hard work and tedious details
@Ephesians-yc3xe 5 months ago

This is probably one of the best overall comprehensive factual breakdown on what turbos actually translate into insofar as performance goes for the 3rd gen Cummins I have ever come across. Well done. What does this '06 have in terms of intercooler, intake horns and transmission on the truck as tested?
@joebatic8791 5 months ago

awesome information right here!
@brucebenjamin4964 2 months ago

So impressed with your dedication in testing!! And SO fun to reap these benefits 😂
@kurtgeiger9564 3 months ago

GREAT information!
@patgrantlandjr.8302 4 months ago

Excellent video Nick! I submitted a ticket with you guys tonight regarding my current tuning. My short-term plan is to purchase an aftermarket turbo from you and have my tunes adjusted accordingly. This video was very detailed and helpful.
@jimkillen1065 5 months ago

I appreciate your videos. I probably never have one of the newer common rail trucks . They certainly run good . Thanks for the advice . When i worked at a power plant there was measurement called opacity i think across the stack . I had some learning experience trying to get the smoke dialed out especially when i went from a automatic to a 6 speed in my old truck
@nawzy202 4 months ago

This really helped me decide what's a good turbo for a towing truck thank you
@RGHTBrainDesignDrive 5 months ago

Great video Nick! Looking forward to seeing the Improved vs. STR vs. 64mm vs. 67mm! I think the 64mm is really the sweet spot for towing with a 4.10 Rear Gear on these trucks.
@DavidHerbers 5 months ago

Phenomenal video. Enjoyed all of it. This really feeds us data nerds. I have your MM3 tuning and am torn between your STR and Stealth 64 if I have no plans to update the CP3 or move beyond a 30% over injector. I also live near and tow at elevation in the Rocky Mountains, 35" tires, 3.73s, and a built Goerend 48RE