With the 5.9 Cummins, 50-hp or 75-hp injectors are about the maximum injector size with the factory turbo. Though, you can still out-do the factory turbo by adding too much fuel. Also, the way the fuel is injected in a diesel engine allows it to make more use of more fuel.īy feeding more fuel into this massively-compressed engine, it’s only natural that you can unlock more power. Consider that the stock turbo size is 62mm, which is absolutely massive in comparison to what you may find on a gas engine. Well, this is partly because of the turbo on the motor. Why is this? With gas engines, just dumping a ton of fuel in an engine that’s not at wide open throttle is harmful to performance-and they have twice the RPM capabilities that diesels do. And the bigger the injectors are, the more power you’ll gain. Suppliers to consider for your shopping cart are BD Power, Scheid Diesel, and Sinister Diesel. Some suppliers guarantee that adding bigger fuel injectors will increase wheel power by at least 60 hp-even with just the smallest upgrades. Even build plans aiming to make a mere 300 hp feature bigger injectors in place of the factory ones. What you will find in your studies, is that virtually every Cummins build (at least the serious ones) has fuel injectors thrown in the mix. This upgrade, paired with a better fuel system will be key to supporting big power builds.ĪFe Power, ATS, and BD Diesel Performance are just a few great names to turn to for durable diesel intake and exhaust manifolds. Hence why swapping the intake and exhaust manifolds is next on our list of worthy 5.9 Cummins mods. They will do the truck well with builds up to about 300 hp, but more than that will require some better flow. Source: ATS Diesel Facebookįactory-cast equipment is built to work, not perform. ATS is the original inventor of the arc-shaped intake manifold, which set the standard across the industry. It’s really cool that late-model stuff often won’t need much attention in this area, but unfortunately, the 24-valve Cummins doesn’t fit the criteria. Just like the fact that many Cummins builds won’t be well-supported by the factory camshaft, the same holds true for the factory manifolds. Canadian-based Colt Cams, known for its performance and drivability, is a go-to choice as well. Hamilton Cams is a popular brand that diesel enthusiasts turn to when they’re looking to harness more power, torque, and pulling strength. It also makes sure the spent fuel can escape. Even with direct injection, this is critical to making sure the right amount of air is being introduced to the burn. But when you start aiming to produce over 400 hp, it’s a must-have upgrade.Īftermarket cams are responsible for when, how far, and how long the valves open up. Most mild builds will leave the stock cam untouched. While turbos and fuel injectors certainly make for major gains, they can only help so much without the use of an aftermarket cam. Diesel engine builds almost always surround the concept of upping the amount of fuel and air introduced to the engine. Upgraded CamsĪs the first real upgrade on our list of 5.9 Cummins mods, let’s talk about camshafts. Quality brands like Bully Dog, DiabloSport, Superchips, Hypertech, and ATS Diesel Performance are all great places to start your search. My advice is to take your time and do the homework on what your ultimate goals are, so you can better decide which tuner will help you unlock the most potential with your particular engine. With that in mind, selecting the right programmer will depend on what you toss at it. And when you start tackling some of the other recommended 5.9 Cummins mods, you will certainly want an aftermarket programmer to take advantage of them. Why? Because even with a base engine, you can reap some serious rewards with an aftermarket programmer.
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