That's beside the fact you're likely running E85 to run more power. Full E85 requires somewhere in the ballpark of 30-40% more fuel flow than 91/93 octane at the same power. However, it puts a lot of stress on any fuel system. E85 mixes are a great way to improve peak boost, timing, and overall engine safety. You opt for a turbo that's within its efficiency range at that power. If you want the same 800whp you don't buy a turbo that's absolutely caked at 800whp. You likely build it to handle 900-1000whp. If your goal is 800whp you don't build out the motor to handle 800whp.
This applies to everything from fueling, to turbos, to engine limits. However, we believe it's a good idea to build in some headroom. A lot of the numbers we mention in this post are nearly maxing out the fueling system. We'll reference power numbers as best we can but we cannot stress the importance of data-logging and paying attention to fuel flow and AFR's. It's kind of a follow up note to the above. Not only for our readers, but also for ourselves. We always like to throw in these reminders. This will be the first fueling mod most N54 owners will want to knock out. Anyways, in general a FBO N54 running E30 or E40 fuel will just about cap out the LPFP. It's also important to note meth injection will play a role as it acts as supplemental fueling. Pump gas will be a bit easier on fueling, however stock turbos can't make over 425whp on pump gas.
Running much more than E30 or E40 fueling is going to cap the stock LPFP quickly. That said, let's lay out the fueling limitations of the stock N54 system: If you intend to push the stock fueling limits keep an eye on HPFP and LPFP pressures, fuel trims, and AFR's. Data-logging is an important and valuable method to keep an eye on fuel flow. Some of it comes down to the health of your stock LPFP, HPFP, and injectors. *Fueling limitations will vary from N54 to N54 even with the same mods, boost, fuel, etc. This will be a quick overview, and we'll add to it throughout the post as we discuss each of the mods individually. *N54 500whp JB4 Integrated Port Injection Kit Pictured N54 Stock Fueling Limitationsīefore diving into any upgrades let's discuss the limits of the stock fueling system. Additionally, we will discuss a few of the best options on the market for all N54 fueling mods. What are the limits of the stock N54 fueling system? At what power do N54 LPFP's, HPFP's, or port injection become necessary? How does E85 factor into all of this? We plan to answer all of these questions and then some. This post will serve as a complete guide to N54 stock fueling limitations and upgrades available.
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