Nostrum High Performance Stage 3 DI Injectors - BMW / N55 / S55 | H705-1605

They’re finally here! The long awaited Stage 3 injectors for the N55 & S55 are available. Flowing a ridiculous 85% more fuel than the stock injector while still maintaining a 250bar operating pressure rating, the Stage 3’s are what you want when you have a 4 digit horsepower goal in mind. Developed to have an OEM equivalent spray pattern, the Stage 3’s deliver unparalleled performance without sacrificing idle quality or drivability.  

Being that everything is installed like a factory part, there’s no need to worry about secondary injection controllers, filling meth tanks, clogged meth injectors, or any of the other complex solutions that remove layers of protection and safety from your engine. Our injectors operate with all the OEM ECU’s engine management system diagnostics and safety functions – resulting in a much happier and responsive system! 

Inside the box, you will find everything you need to get your new injectors installed quickly, including pre-installed decoupling rings and detailed instructions for a no nonsense install. When you are ready to tune, we can get you set up with one of our trusted certified tuners, or we have injector tuning data available for your existing dealer or tuner.  

Take your Nostrum Stage 3 injectors to the limit by pairing them with our HPFP upgrade kit, flowing an incredible 36% more fuel than the stock pumps! That additional fuel flow allows for significant torque increases earlier in the rev range, and provide the injectors with all the fuel they need to make more peak horsepower, when properly tuned. Get the best deal by bundling up! 

Nostrum back all of our parts with a limited lifetime warranty.  We have customer service and calibration engineers on staff to provide you with any support that you may need, from install to tuning. 

WHP potential on Gasoline::
1000 WHP (Calculated assuming 24 MPa fuel pressure and 328 g/(kW/hr)

WHP potential on E85::
730 WHP (Calculated assuming 24 MPa fuel pressure and 328 g/(kW/hr)

Flow Rate:: 20.2 g/s @ 100 bar

Flow rate increase over Stock:: 85%

Max Operating Pressure:: 250bar / 25MPa / 3625psi

Tune required?: Yes

Recommended Tuning Suite:: Ecutek, MHD & Bootmod3

Contact us for tuning recommendations!

Support@nostrumshop.com or 734-548-8677

Frequently ask questions:

• Will these also fit an S63?
  
  Yes, but they are batched in sets of 6. For sets of 8, see: 

• I see a lot of mentions about OEM equivalent spray patterns. What does that mean and why is it important?
  
  The spray pattern of an injector (the spray geometry and its mass distribution) is designed to optimally interact with an engine air flow inside the combustion chamber to improve fuel evaporation and create a homogenous air-fuel mixture that results in a higher combustion quality. The combustion quality directly impacts the vehicle’s cold start performance, idle stability, overall drivability, NVH, knock propensity, soot and other constituent tailpipe emissions.  
  
  The spray pattern is specific for each engine application. Installing an injector from another engine model, inevitably makes the spray distribution’s interaction with the air flow inside the combustion chamber sub optimal. This typically results in improper mixture formation leading to cold start and drivability issues, engine misfires, increased knock propensity and soot. Additionally, the wrong spray pattern can result in liquid fuel impinging in the cylinder walls, causing oil dilution and thereby increasing mechanical wear to engine components.