XDI – High Flow LT4/LT5 Injectors +50%

These high-flow injectors are designed for performance builds demanding increased fuel delivery. They offer significant flow improvements over production LT1/L86 and LT4 injectors and are E85 compatible.

Specifications

LT4 +30% Injectors:

• Static Flow Rate: 23 g/sec (2000 cc/min @ 100 bar)
  • 50% more flow than production LT1/L86 injectors (15.3 g/sec)
  • 30% more flow than production LT4 injectors (17.7 g/sec)
• Max Pressure: 221 bar / 3200 psi

LT4 +50% Injectors:

• Static Flow Rate: 26.6 g/sec (2300 cc/min @ 100 bar)
  • 50% more flow than production LT4 injectors (17.7 g/sec)
• Max Pressure: 221 bar / 3200 psi

LT4 +70% Injectors:

• Static Flow Rate: 30.1 g/sec (2600 cc/min @ 100 bar)
  • 70% more flow than production LT4 injectors (17.7 g/sec)
• Max Pressure: 193 bar / 2800 psi

Note: Due to their large size, these injectors may not deliver stock-like drivability, especially on pump gas. Manual transmission cars may experience pressure overshoots after shifting, potentially causing misfires. Reducing pressure may be necessary.

Requirements

• Fuel System Upgrades: Requires upgraded low-pressure and high-pressure fuel pumps to reach full potential.

Power Potential and Recommended Combinations (LT4 +30%)

• 750–850 WHP on Full E85: Use with minimum +32% cam lobe on LT4 OEM HPFP (up to 3200 psi) or Katech Goliah/LPE HPFP.
• 1000 WHP on Blends or Race Gas (Turbo): Pair with minimum +32% cam lobe on LT4 OEM HPFP or Katech Goliah/LPE HPFP.
• 1000 WHP on Full E85 (TVS2650, Whipple, F1A): Requires +32% cam lobe on LT4 OEM HPFP or Katech Goliah/LPE HPFP and methanol injection, or with our XFP3200 belt-driven fuel pump.
• 1200 WHP on Race Gas (Turbo): Pair with our XFP3600 belt-driven fuel pump.

For Higher Output Applications

• XDI LT4 +70% Injectors are recommended for naturally aspirated (e.g., Nitro-Methane), low-RPM turbo applications, or centrifugal superchargers when combined with the LPE Big Bore pump or Katech Goliath.

Important: The LPE Big Bore + LT4 +70% injectors will not meet fueling demands for setups with a 2650 TVS or Whipple blower on E85. In these cases, we recommend our XFP3200 + 70% injectors or supplemental fueling (methanol, PFI) around peak torque.

---

Tuning Support: Compatible with HP Tuners and standalone ECUs

All performance figures assume a fully supported setup.