GM LT4 +70% Fuel Injector Set

The XDI GM LT4 +70% Injector Set is engineered for high-horsepower GM Gen V V8 and V6 direct injection engines, including LT4, LT1, L86, L83, and LV3 variants. These injectors provide a significant increase in fuel flow, offering 70% more flow than production LT4 injectors and 96% more flow than LT1/L86 injectors, eliminating the need for auxiliary fuel systems. They are designed as a 100% drop-in replacement with an OEM spray pattern and are compatible with all known fuels, including all ethanol blends. Key specifications include a maximum rail pressure of 193 bar (2800 psi) and a static flow rate of 30.1 g/sec (2600 cc/min @ 100 bar). The flow rates are 2600 cc/min at 100 bar and 3700 cc/min at 200 bar. Performance is described as rock-solid and perfectly linear. Testing at XDI ensures each set is flow-matched to within ±0.5% at 100 bar and 200 bar fuel pressure, with documentation provided for idle stability (0.8 ms at 20 bar), static flow reference (10 ms at 100 bar), and WOT performance (6 ms at 200 bar). Installation requires custom tuning, with at least one ECU value change. Stock-like cold start and idle are not expected, particularly on pump gas. Due to their large size, these injectors may impact drivability on pump gas, and manual transmission vehicles might experience pressure overshoots after shifting, potentially causing misfires. Reducing pressure may be necessary. Global B ECUs might require extra tuning on a case-by-case basis. This injector set is compatible with a wide range of GM vehicles, including the C7 Corvette (LT1 and LT4), Camaro SS and ZL1 (LT1 and LT4), CTS-V (LT4), CT5-V Black Wing (LT4), Silverado and Sierra trucks (LV3, L83, and L86 engines), and Suburban, Tahoe, Yukon, and Escalade SUVs. However, they are not compatible with 6mm shaft injectors.