How Much Horsepower Can 440Cc Injectors Handle?

Determining the appropriate fuel injector size for a 450 horsepower engine involves considering various factors such as the engine type (naturally aspirated or with a power adder) and the desired horsepower range. Fuel injectors are rated based on their flow rate, which is the amount of fuel they can deliver in pounds per hour (lbs./hr.). Here’s a revised breakdown of injector flow rates for different horsepower ranges:

• For a naturally aspirated engine producing 350 to 450 horsepower, a suitable injector size would be around 30 lbs./hr.
• If your engine is naturally aspirated and falls within the 300 to 375 horsepower range, you can opt for 36 lbs./hr. injectors.
• For engines with a power adder like a turbocharger or supercharger aiming for 425 to 540 horsepower, 36 lbs./hr. injectors are appropriate.
• If your power-adder-equipped engine targets 350 to 450 horsepower, you should consider 42 lbs./hr. injectors.
• For even higher power levels, such as 500 to 625 horsepower in naturally aspirated engines or 410 to 525 horsepower with a power adder, 42 lbs./hr. injectors are suitable.
• Engines pushing 540 to 690 horsepower naturally aspirated or 450 to 575 horsepower with a power adder should use 46 lbs./hr. injectors.

These injector flow rates help ensure that your engine receives the right amount of fuel to support its specific power output, whether it’s a naturally aspirated or power-adder-equipped setup. Keep in mind that these values are approximate guidelines, and other factors like fuel pressure and engine tuning also play a crucial role in achieving optimal performance.

What is the flow rate of a 440cc/min injector? To clarify, this injector has a static flow rate of 42 lb/hr when operating at a fuel pressure of 43.5 PSI (300kPa) with gasoline. This means that it can deliver 42 pounds of fuel per hour while maintaining a fuel pressure of 43.5 PSI (300kPa), which is equivalent to a flow rate of 440 cc/min.

How much horsepower can 550cc injectors handle? Typically, 550cc injectors are capable of supporting up to 350 wheel horsepower (whp). This power output can be achieved at 15 pounds per square inch (psi) of boost using a GT30R turbocharger or at 10-12 psi with a GT35R turbocharger. It’s a common practice among enthusiasts to install injectors larger than their specific power requirements to ensure sufficient fuel delivery. For instance, in the case of the author’s setup on April 9, 2007, they opted for 740cc injectors with their 2871R turbocharger, knowing that this choice would prevent the injectors from reaching their maximum capacity, thereby maintaining reliable fueling for their application.

Flow Rate Definition, Calculating Horsepower Range

Injector Flow Rate	Naturally Aspirated Engine	Engine w/ Power Adder
30 lbs./hr.	350-450 hp	300-375 hp
36 lbs./hr.	425-540 hp	350-450 hp
42 lbs./hr.	500-625 hp	410-525 hp
46 lbs./hr.	540-690 hp	450-575 hp