Picking the Best L5P Upgrades for Your Duramax
If you're hunting for the best l5p upgrades in order to finally wake upward your 2017–2023 Duramax, you are already aware these trucks are solid through the factory but definitely possess some untapped potential. The L5P engine brought a lot of improvements on the older LML, just like a stronger stop and better heads, but GM still left a lot on the table when it comes to throttle response and pure pulling energy. Whether you're searching to tow the heavy fifth-wheel with no breaking a sweat or you simply want that "throw you back in the seat" sensation, there are a few specific parts that actually make a difference.
Starting with Airflow and Intake
Most people start their build with a chilly air intake since it's a relatively cheap and easy afternoon project. Whilst the stock airbox on the L5P isn't terrible, it's designed more for quiet operation than maximum flow. When you're planning upon adding more energy or a beat later, you're heading to need more air to maintain those EGTs (exhaust gas temperatures) within check.
A good S& B or even Banks Ram-Air consumption is usually the particular go-to here. These systems open upward the airway plus let the turbo breathe. You'll see a little even more turbo whistle—which let's be honest, we all want—but more importantly, it smooths out the power delivery. It's not going to give you 50 horsepower on its own, however it lies the foundation for every other modification one does down the road.
The Fine tuning Hurdle and ECM Unlocking
We all can't discuss the best l5p upgrades without addressing the elephant in the room: the particular locked ECM. In contrast to older Duramax motors where you can just plug in a tuner and go, the L5P's engine control module is usually locked down firmer than a carol. To actually beat these trucks, you usually have to deliver your ECM out there to be revealed or buy the pre-unlocked one from a company like HP Tuners.
It's a bit of a hurdle and a piece of change, but it's the one biggest "night plus day" difference you may make. A good clean tune can add anywhere from 50 to 150+ horsepower while actually improving your fuel economy if you possibly can keep your feet from it. It furthermore fixes that frustrating dead pedal feeling where you strike the gas and wait a full second for the truck to decide it's time to move.
Why A person Need a Lift Pump
One of the weirdest things about the L5P through the factory is that will it doesn't possess a lift water pump in the container. It relies on the high-pressure injection pump (the Denso HP4) to suck fuel all the way from the tank to the engine. While the particular HP4 is the great pump plus way more dependable than the old CP4, asking it to do all of that work creates a lots of stress and can lead to fuel starvation whenever you're pushing the particular truck hard.
Installing a FASS or AirDog lift pump is 1 of these "insurance" upgrades. It sits on the frame rail and pushes the steady, pressurized stream of clean, air-free fuel to the particular engine. Not only does this take the load out of your expensive injection pump, but it furthermore adds extra purification. Modern diesel injectors have tolerances thinner than a human hair, so keeping dirt and water out of all of them will be the best method to avoid a $5, 000 fix bill.
Much better Fuel Filtration
Speaking of gas, these aftermarket lift pumps use filter systems that are much simpler to find plus cheaper to replace than the OEM types. Plus, they usually have a water separator that's much more effective. If you reside in a cool climate or purchase fuel from doubtful stations, this is usually easily one of the best l5p upgrades for long-term reliability.
Fixing the particular Exhaust Bottleneck
If you're maintaining the emissions products intact, you're the bit limited on what you can do with the exhaust system, but there are still ways to enhance flow. The manufacturing plant downpipe for the L5P is notoriously limited. It's got a few ugly bends plus collapses that creates back pressure right at turbo charged outlet.
Changing in a high-flow downpipe helps the particular turbo spool upward faster and helps drop those EGTs whenever you're hauling the heavy load upward a grade. It's a tight squeeze to install, however your turbo will thank you for it. If a person want to move one step further, appear into a "stealth" or "screamer" turbocharged. These are drop-in replacements that appear stock on the outside but have upgraded internals in order to move way more air without requiring a bunch of custom fabrication.
Strengthening the particular Transmission
The Allison transmission behind the L5P is legendary, but it isn't bulletproof—especially once you start adding 100+ horsepower using a tune. For the particular 2017-2019 trucks along with the 6-speed, a person really have to be careful about "limping" the transmitting if you get too aggressive.
One of the best l5p upgrades for your driveline is a TCM (Transmission Control Module) tune. This increases the line pressure inside the trans, which assists the clutches hold tighter and helps prevent slipping. It also changes the change points so the particular truck isn't continuously hunting for gears. If you have the 2020+ versions with the 10-speed Allison, tuning continues to be an option and the actual truck feel much more athletic plus less like a heavy work horse.
The MAP Sensor Spacer
This is the small, cheap imod that most people neglect, but it's actually a genius fix. Due to the way the EGR (Exhaust Fuel Recirculation) works upon these trucks, the particular MAP sensor—which actions boost pressure—tends to get caked within oily soot. When that sensor gets covered in gunk, it sends poor data to the particular computer, and your own performance suffers.
A MAP messfühler spacer moves the sensor out of the immediate path of this soot. It's a 10-minute install and expenses very little, however it keeps your engine running the method it's supposed in order to for much longer. It's probably the best "bang for your buck" reliability imod available for an L5P.
Improving the Intercooler Pipes
The manufacturing plant intercooler pipes on the L5P are made from plastic and make use of quick-connect clips which are prone to seeping or even blowing away under high boost. If you've actually had a boot blow off while towing, you know it sounds like the gunshot and leaves you stranded along with zero power.
Swapping these away for heavy-duty silicon boots and stainless steel pipes is a great move. Not only do they look a lot better beneath the hood, yet they also eliminate the risk associated with a boost leak. Most aftermarket kits are usually larger in diameter than the stock ones, too, which more helps with that objective of having as much air in to the motor as possible.
Handling the High temperature
If you do a great deal of heavy towing in the summer time, you could also want to look at a bigger aftermarket intercooler. The particular L5P runs sizzling by nature, and keeping those intake air temperatures down is key to preserving power. When the particular computer sees the particular air getting too hot, it will pull back the particular fuel to protect the engine, which usually means you reduce power right when you need it most on the steep climb.
Conclusion
Building the perfect Duramax doesn't mean you have to do everything at once. If you're simply starting out, get an intake plus a MAP sensor spacer to get items moving. When you're ready for the large gains, check out the ECM unlocking and also a lift pump. The best l5p upgrades are the types that balance performance with longevity. These types of trucks are costly, and while we all want more rate, keeping the engine healthy so it can hit 300, 500 miles could be the real goal. Focus on the airflow and gasoline delivery first, and the rest associated with the build can fall right into place.