Willard is an old school Dodge Ram 2500 with a 5.9 Cummins build that has been pushing the limits of what a stock VP44 can do. Last time on the dyno this diesel truck laid down serious power on the Aggressor 67-9 turbocharger, and now we have bigger fuel injectors in it. One question on the table: is the pump the ceiling or were the injectors holding it back?
This is real diesel engine testing on a real dodge ram 2500 Cummins. No guessing, no forum opinions. We strap it to the dyno at max effort and let the data talk. If the bigger injectors move the needle, we know the VP44 still has room. If they don't, we know exactly where this stock pump lives and what that means for your own build.
After the injector test we are not walking away. The 67-9 comes off and an Aggressor 62-9 turbocharger goes on. Two completely different setups, same diesel power, same tune. The dyno graph comparison between the two is going to show you exactly what turbo size does on a VP44 truck and where you actually feel the difference on the street and on the hook.
If you are building a Cummins diesel and trying to figure out what a stock pump can support before you start throwing parts at it, this is the video that answers it. Head to the Power Driven Diesel YouTube channel and pull up the Willard playlist to follow this build from day one. Subscribe and hit the bell so you do not miss the tow test coming next.
Everything you need to build your own second gen is at PowerDriven.com. If you're chasing horsepower on a VP44, the links are below.
Shop Power Driven Diesel: https://www.powerdriven.com
- Power Driven PowerJet Injectors for 98.5-02 VP44 Cummins
https://powerdriven.com/products/power-driven-powerjet-injectors-for-98-5-02-vp44-cummins
-Power Driven Aggressor 67-9
https://powerdriven.com/products/power-driven-aggressor-67-9-turbocharger?_pos=5&_sid=707f32b14&_ss=r
-Power Driven Aggressor 62-9
https://powerdriven.com/products/power-driven-aggressor-62-9-turbocharger?_pos=3&_sid=626528d4d&_ss=r
0:00 Intro — Willard on the dyno 0:50 VP44 limit vs injector limit
1:42 Dyno run — bigger injectors, Power Level 10
2:30 Results and injector recommendations for VP builds
3:09 Cold start and drivability issues with big injectors on a VP
4:15 Turbo swap — 62mm replaces the 67/9
5:11 Dyno run — 62mm at Power Level 10
5:58 Dyno graph comparison — 62mm vs 67/9
7:27 What this means for your VP44 build
9:05 Willard playlist callout and wrap up
Power Driven Diesel is a specialty performance shop engaged in the engineering and development of high-performance turbo diesel technologies.
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