Fuel Injector Clinic 1650cc High-Impedance Injector Set for LS3, LS7, LSA, L76, L92 and L99

Fuel Injector Clinic 1650cc High-Impedance Injector Set for LS3, LS7, LSA, L76, L92 and L99

Part Number: IS303-1650H

The Fuel Injector Clinic IS303-1650H is a matched set of eight high-impedance fuel injectors for LS3, LS7, LSA, L76, L92, and L99 applications.

Each injector flows approximately 1650 cc/min at 43.5 psi and 1900 cc/min at the GM original-equipment fuel pressure of 58 psi. This provides substantial fuel capacity for high-output forced-induction, E85, and race-fuel combinations while retaining the injector characterization needed for controlled idle, startup, and part-throttle operation.

The 1650H uses stainless-alloy internal valve components and is compatible with pump gasoline, E85, Q16, VP Import, FTW, and other MTBE-oxygenated race fuels. Fuel Injector Clinic individually serial-numbers and tests each injector using its Data Match Technology process.

Key Features

• Set of eight matched port-fuel injectors
• Designed for LS3, LS7, LSA, L76, L92, and L99 applications
• 1650 cc/min nominal flow rate at 43.5 psi or 3 bar
• Approximately 160 lb/hr at 43.5 psi
• Approximately 1900 cc/min at 58 psi or 4 bar
• Approximately 180 lb/hr at 58 psi
• Saturated, high-impedance electrical design
• Stainless-alloy internal valve construction
• Compatible with gasoline, E85, and supported oxygenated race fuels
• Individually serial-numbered injectors
• Matched using Fuel Injector Clinic Data Match Technology
• Application-specific GM ECU data available from Fuel Injector Clinic
• Application-specific O-rings included
• Covered by Fuel Injector Clinic’s lifetime limited warranty for the original purchaser

Kit Includes

• Eight Fuel Injector Clinic 1650 cc/min high-impedance injectors
• Application-specific upper and lower O-rings
• Replacement injector-connector pigtails
• Fuel Injector Clinic Data Match sheet with injector characterization information

Technical Specifications

Flow Rating

• 1650 cc/min at 43.5 psi differential fuel pressure
• Approximately 160 lb/hr at 43.5 psi differential fuel pressure
• Approximately 1900 cc/min at 58 psi differential fuel pressure
• Approximately 180 lb/hr at 58 psi differential fuel pressure
• Flow tested using CF-16B calibration fluid at approximately 90°F

Electrical Configuration

• Saturated, high-impedance injector design
• Compatible with conventional saturated injector drivers
• No external injector resistor pack required in supported applications
• Injector-harness connector conversion required for the listed factory applications

Fuel Compatibility

• Pump gasoline
• E85
• Q16
• VP Import
• FTW
• Other compatible MTBE-oxygenated race fuels

Injector Characterization

• Dynamic slope flow rate for each individually serial-numbered injector
• Individual injector offset-deviation values
• Injector voltage-offset table
• Application-specific GM ECU data available from Fuel Injector Clinic
• Injector data must be entered correctly for the ECU, fuel pressure, and fuel being used

Application Notes

• This injector set is designed for LS3, LS7, LSA, L76, L92, and L99 intake and fuel-rail configurations.
• This listing is for one matched set of eight injectors.
• The current Fuel Injector Clinic product information states that the factory injector connectors must be replaced for this injector set.
• Replacement pigtails are included and may be installed by properly splicing them into the existing injector harness.
• Optional plug-and-play connector adapters may be used instead of modifying the original harness and are sold separately.
• Aftermarket fuel rails, intake manifolds, injector bungs, or unusual combinations may change the required injector length, O-ring size, or electrical connection.
• Confirm fitment before ordering when using non-factory rails or intake hardware.
• The published 1650 cc/min rating is measured at 43.5 psi differential fuel pressure.
• At the GM factory pressure of 58 psi, the injectors flow approximately 1900 cc/min.
• Injector flow changes with differential fuel pressure; ECU configuration must reflect the actual base pressure and manifold-pressure reference strategy.
• Injector characterization data must be entered into the ECU rather than relying only on the nominal flow rating.
• Fuel-system capacity, pump selection, regulator capacity, line sizing, filtration, and electrical supply must be adequate for the intended fuel and power level.
• Power capability is not specified because required injector capacity depends on fuel type, base pressure, brake-specific fuel consumption, duty-cycle target, and engine configuration.

Emissions and Competition-Use Notice

Unless specifically identified as emissions-legal for the applicable vehicle and application, this product is intended for sanctioned competition, off-road, or other non-emissions-controlled use. Installation or use on an emissions-controlled vehicle operated on public roads may violate federal, state, or local law. The purchaser and installer are responsible for confirming and maintaining compliance with all applicable emissions and vehicle-use regulations.