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HIGH FLOW Fuel Injectors

When do you need larger injectors?

When you increase the power of your engine thru either nitrous, bolower or turbo boost above 10 psi or above 500 HP we have found that the factory fuel injector become inadequate. The fuel injector flow must be matched to the airflow requirements of the engine over the entire rpm operating range. The injectors must be able to supply a large amount of fuel at wide-open throttle to prevent high rpm lean out, and transitional amounts to cover all of the operating conditions in between. Supercharged engines in particular place even more rigorous demands on an injectors range because of their increased airflow capability.

Choosing the Correct Fuel Injectors

Electronic fuel injectors have two masters to satisfy. They must accurately match the fuel demands of an engine while meeting the electronic commands of the engine management computer. Obtaining the correct fuel flow amount from a group of injectors in an EFI system is similar to determining the right size jets for a carbureted engine. The fuel flow of both systems must be matched to the airflow requirements of the engine over a broad rpm operating range. The injectors must be able to supply a small amount of fuel to support engine idle, a large amount at wide-open throttle to prevent high rpm lean out, and transitional amounts to cover all of the operating conditions in between. Turbo/superchrged engines in particular place even more rigorous demands on an injectors range because of their increased airflow capability. Just as the wrong-sized jets in a carb can cause driveablity problems such as rough idle, surging, poor throttle response or even high-rpm lean-out causing scattered engine parts, so can incorrectly sized injectors. The following is a guideline equation for approximating fuel flow per injector based on estimates on engine Horsepower (HP) and Brake Specific Fuel Consumption (BSFC). Engine HP must be a realistic estimate of engine output. BSFC is determined from engine dynamometer measurements. It typically ranges from 0.4-0.6 for gasoline powered engines. A BSFC of 0.55 is a reasonable initial estimate for a supercharged engines. The 0.8 multiplier of the "Number of Injectors" helps us derive a practical, maximum "Injector Flow Rate" for each injector based on an effective real world injector operating pulse time and fuel flow. It's unrealistic to establish the fuel flow to the engine based on an injector operating pulse time of 100% (wide open all the time). This formula uses an injector operating cycle based on 80%. Some full race engine management systems may operate at 85-95% duty cycle, but doing so for some time increases the likelihood of overheating the injectors which may cause irregular fuel rates or a decrease in low rpm operation. Injector Flow Rate (lb/hr) = Engine HP x BSFC Number of Injectors x 0.8 For example, to calculate the individual injector size for a 650 HP V8 using 8 injectors and a BSFC of 0.55 Injector Flow Rate (lb/hr) = 650 x 0.55 8 x 0.8 = 55.85 lb/hr Using the formula above injectors with a flow rating of 56 lb/hr static flow at 43.5 psi (3bar) fuel system pressure would be an adequate injector selection. If you have a known injector fuel flow rate you can solve the above equation for a rough estimate of fuel system capacity like this: For example, using the same estimated values from above: Engine HP = 50 x 8 x 0.8 0.5 = 640HP Part # Injector Size HP MAX. Application Price   RPM-462010 62-Lb (EV1) 1200 HP Max. Seimens 62-Lb Fuel Injector (high impedance) EV1 Connector type, Injectors are priced each $ 39.99 (each)   RPM-462011 62-Lb (EV1) 1200 HP Max. Seimens Shorty Design 62-Lb Fuel Injector (high impedance) EV1 Connector type, Injectors are priced each $ 39.99 (each)   RPM-462012 52-Lb (EV6) 900 HP Max. Seimens 52-Lb Fuel Injector (high impedance) EV6 Connector type, Injectors are priced each $ 45.99 (each)   RPM-462013 42-Lb (EV1) 650 HP Max. Bosch Style 42-Lb Fuel Injector (high impedance) EV1 Connector type, Injectors are priced each $ 34.99 (each)   RPM-462014 39-Lb (EV6) 630 HP Max. Seimens 39-Lb Fuel Injector (high impedance) EV6 Connector type, Injectors are priced each $ 41.99 (each)   RPM-462015 RPM Seris Fuel Injector Wire Harness Adapter Exclusive Stanless Steel Positive Locking System Adapts your EV6/EV14 style harness to EV1 injectors, priced each $ 4.99 (each)   FMSM14464-A8 Ford Racing FUEL INJECTOR Adaptor 8PK Adapts your EV1 style harness to EV6 / EV14 injectors Packaged in sets of (8) $ 39.99 (set of (8) Click-On Price to Order MOTOBLUE™ GEN II Billet Fuel Pressure Gauge Kit 05-08 Mustang GT If you were looking to add a new fuel pressure gauge or to tap into the fuel supply safely on your 05-08 Mustang GT, you’re in for a surprise. You will quickly find that there is not a place to access the factory fuel system. FORD has removed the fuel test port on the 05-08 Mustang GT. To accommodate the need of the performance enthusiast, we went to the engineers at MOTOBLUE™ and asked if they could come up with a safe and cost effective solution to this small dilemma. As a result, MOTOBLUE™ developed, tested and has now made available, a fuel pressure rail sensor adaptor/gauge kit for the 05-08 Mustang GT. The MOTOBLUE™ fuel pressure rail sensor adaptor kit allows you to access the factory fuel system with two separate ports. The MOTOBLUE™ Fuel pressure rail sensor adaptor kit includes fuel specific o-ring seals, Two 1/8 ' pipe plug openings, new mounting bolts, auto meter pressure gauge. The kit is hard coat anodized with the signature MOTOBLUE™ Gen II red anodizing. Designed as a direct bolt-on and comes with easy to follow instructions. Installation time is less than 20 minuets. With very basic hand tools. GEN II Billet Fuel Pressure Gauge Kit Features: CNC machined from 6061-T6 aircraft grade aluminum for strength and durability. Kit includes two 1/8' pipe plug opening for fuel access ports. Kit includes fuel specific o-ring seals, 1/8' pipe plug. Kit includes 0-to-60 psi Auto Meter gauge. Hard coat anodized with MOTOBLUE Gen II Red. NO cutting or welding required. Complete with detailed instructions Designed as a direct-bolt-on and require no other modifications. Part # Description Price MTB-410522 GEN II Billet Fuel Pressure Gauge Kit $ 39.99 Click-On Price to Order GT 40 SUPERCAR Fuel Pump Upgrade (255 liter per hr. variable speed high-output pumps) When is it time to upgrade the fuel pumps? We have found that when you increase the power of your vehicle above 500 HP, the factory 110 LPH Fuel pumps will become inadequate. As your engine develops higher levels of power, one critical process is almost always overlooked: fuel delivery and supply. Your engine’s fuel demand must match the airflow requirements of your engine throughout the entire rpm operating range. “Dyno” testing has found that even dual factory 110 liters per hour fuel pumps, run short of volume and pressure above 4000 rpm. We have developed, tested and can now provide the perfect fix for this process Our two-pump GT 40 SUPERCAR Fuel Pump kit will upgrade the stock high pressure, low volume pumps with high performance Ford “race proven” fuel pumps. The GT 40 SUPERCAR Fuel Pumps are variable speed high-output pumps that flow up to 300 liters per hour at 17 volts. With this pump upgrade, your vehicle will be more than capable of maintaining fuel volume without any pressure drop off, and will supply fuel demands up to 800+ hp. Replacement can be accomplished with simple hand tools in under 2 hours Part # Year Engine Description Price RPM-542554 99-08 V6/V8 GT 40 SUPERCAR Fuel Pump UPGRADE Variable speed high-output pump kit In-Tank Replacment Pump Kit Set Of 2 $ 199.99 RPM542552 99-08 V6/V8 GT 40 SUPERCAR Fuel Pump UPGRADE Single Variable speed high-output pump Single In-Tank Replacment Pump $ 129.99 Click-On Price to Order Mustang GT Dual Fuel Pump Upgrade Kit (For the 05-08 Mustang GT) Are you ready to step up to the GT500 fuel Pump Kit? The Mustang GT Dual Fuel Pump Upgrade Kit id designed to fit the 05-08 Mustang GT, It includes harness, dual fuel pumps, drop in housing and fuel pump driver module from the 07-08 SVT Shelby Gt500 Mustang. This kit also includes all installation instunctions and hardware required for a factory upgrade. This kit is highly recommended for any application making over 400 hp and is the same fuel pump kit as used in the 07-08 SVT Mustang 500 hp supercharger kit. Replacement can be accomplished with simple hand tools in under 2 hours Part # Description Price FMS-M-9407-GT05 Mustang GT Dual Fuel Pump Upgrade Kit Ford Racing In-Tank Replacment 2-Pump Kit Includes harness, dual fuel pumps, all installation hardware $ 849.99 Click-On Price to Order