XDI Injectors + Stanadyne RGX HPFP Bundle

XDI High Flow Di Injectors + Stanadyne RGX HPFP for the Gen. V GM LT Direct Injection Engines (LT1/LT4/L86/LT2)

When it comes to unlocking the true potential of your Gen. V LT engine, fuel flow limitations can be a major roadblock. Even with larger cam fuel lobe, and a low side boost-a-pump, it doesn't take long before the stock mechanical fuel pump, injectors and low-side pump struggle to keep up with the fueling needs from ported blowers, more boost, and E85. Although the benefits of Direct Injection are clear, taking your LT4 from a stock 550rwhp to the all to common 800-1,000rwhp + requires an investment in fuel volume availability. Luckily, the bright minds at Stanadyne (the current OEM manufacture of the LT1 and LT4 HPFP’s) listened to the cries for more volume, more durability, and more lift. And boy were those calls answered with what has been dubbed… the RGX. Using the RGX Pump and XDI 70+ Injectors, many shops have seen DYNO numbers over 1,200 horsepower on 93 octane and 1,100 horsepower on E85. This is why simplicity of upgrading the Di components has been such a popular choice for builds aiming for 1,000rwhp or less.

For those who may not know… XDI’s success on many DI platforms could not have been possible without its founder, Uwe Ostmann’s 25 extensive years in motorsports and DI development. Uwe’s journey started in 2001 when he joined the talented team at Bosch Germany in August 2001. Use spent many of those early years developing Diesel High Pressure Nozzles and overcame many challenges related to tuning a common rail based high pressure fuel system.

After leading the Audi Le Mans LMP1 project for four years including fuel system and controls development and developing several key technologies at Bosch Motorsport in Germany, Uwe came to Bosch Motorsport USA in July 2012.

With Uwe’s talent and determination it didn’t take long before he took over the fuel system development of all OEM race projects based on GDI systems, including the Corvette C7.R, the Ford Daytona Prototype 3.5 EcoBoost and some others that cannot be mentioned in detail. He played a vital role in developing advanced combustion analysis systems and custom fuel systems and controls for several research projects with high pressure fuel systems up to 500bar / 7250psi.

In December 2014 Uwe quit Bosch Motorsport to create XDI. The first and only Bosch Motorsport Dealer and aftermarket supplier in the world with focus on high pressure GDI race projects. Since then Uwe has continued to grow XDI’s technology, effectiveness, and product line to not only support several race programs, on wheels and on water, endurance, drift and drag… but even more importantly… your street car!

Stanadyne RGX High Pressure Fuel Pump;

The RGX HPFP pump is the result of Stanadyne’s dedicated to blend OEM reliability with the performance demands of the aftermarket. As a globally recognized leader in fuel system technology, Stanadyne brought its vast expertise to the table to make this project a success, despite the technical challenges. The desire for higher flow and pressure led Stanadyne to develop a larger volume, 350-bar-capable pump for high-horsepower applications. This third-generation design is externally analogous to the original LT4 pump, but is fitted with a larger 12-milimeter plunger, has important internal modifications, and can accept up to an 8.2mm plunger stroke which allows you to safely run a 38% fuel love up to 9,000rpm.

The new Stanadyne RGX “Race Grade Xtreme” High Pressure Fuel Pump is the next evolution of the proven Stanadyne high-output GDI pump platform used in serious LT-based builds. If the original Goliath was built to push the limit of LT4 direct-injection fuel delivery, the RGX is the refined, more durable, motorsports-focused version designed to survive at higher stroke, higher RPM, and higher fuel demand.

For modified LT4, LT1, L86, LT2, and other Gen V GM applications, the high-pressure fuel pump is one of the most important parts of the entire fuel system. The low side can feed fuel to the engine bay, but the HPFP is what turns that supply into the extreme rail pressure required by direct injection.

When you start adding boost, E85, ported or larger superchargers, the stock fuel system quickly taps out and your biggest bottleneck is the OEM fuel system. This may be the biggest crossroads event of your build. Although this is a deep subject, the quick version is… if you are aiming for more than 1,000rwhp, we suggest looking at the Too High PSI Port Injection solutions. Aiming for 1,000rwhp or less… then upgrading the OEM Di System is the easiest path forward. For those who have chosen to upgrade the Di comportment… this RGX HPFP is for you!

Benefits;
-Direct bolt in for all GM Gen. V LT Engines.
-Larger 12mm bore size for 22% more fuel volume.
-Designed up to 350bar operating pressure or 5,000psi.
-Improved spring design for superior high RPM stability.
-Improved Volumetric efficiency over OEM and competing pumps.
-Capable of up to 8.2mm camshaft lobe lift (equal to a 38% fuel lobe)

XDI Fuel Injectors;

As you know, High-Flowing Fuel Injectors are a major component to High HP builds on a Direct Injected platform like the LT4. Although there are several manufactures to choose from, you can always count on Griffin-Motorsports carrying the highest quality and most trusted products on the market. Which is why we only offer XDI Fuel Injectors. Built upon the foundation of the original GM LT4 injector, they provide a straightforward drop-in installation with minimal adjustments to existing ECU injector characteristics. Each injector undergoes meticulous testing at 100bar and 200bar on OEM equipment at XDI, ensuring precise flow matching within ±0.5% for consistent performance. Tested on fully instrumented engines for superior cylinder distribution and stability at pressures up to 3000psi. These injectors are also fully E85 compatible, making them a versatile choice for performance enthusiasts, and the same injector that can be found on our 915rwhp Shop Car.

XDI 30+ Injector Specifications;

• 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 Rail Pressure: 221 bar / 3000 psi

• Fuel Compatibility: all known fuels, all Ethanol blends

• Electric Connector: Bosch EV1

• Driver Profile: XDI, tuning changes needed

• Tuning Support:  Standalone, HPT, MoTeC

• Idle Stability: 0.8 ms at 20 bar

• Static Flow Reference: 10 ms at 100 bar

• WOT Performance and Stability: 6 ms at 200 bar

• Tuning Support: Compatible with HP Tuners and standalone ECUs

XDI 50+ Injector Specifications;

• Static Flow Rate: 26.6 g/sec (2300cc/min @ 100bar)

  • 73% more flow than production LT1/L86 injectors (15.3 g/sec)

  • 50% more flow than production LT4 injectors (17.7 g/sec)

• Max Rail Pressure: 221 bar / 3000 psi

• Fuel Compatibility: all known fuels, all Ethanol blends

• Electric Connector: Bosch EV1

• Driver Profile: XDI, tuning changes needed

• Tuning Support:  Standalone, HPT, MoTeC

• Idle Stability: 0.8 ms at 20 bar

• Static Flow Reference: 10 ms at 100 bar

• WOT Performance and Stability: 6 ms at 200 bar

• Tuning Support: Compatible with HP Tuners and standalone ECUs

XDI 70+ Injector Specifications;

• Static Flow Rate: 30.1 g/sec (2600cc/min @ 100bar)

  • 70% more flow than production LT4 injectors (17.7 g/sec)

  • 2600 cc/min at 100 bar

  • 3700 cc/min at 200 bar

• Max Rail Pressure:193bar / 2800psi

• Fuel Compatibility: all known fuels, all Ethanol blends

• Electric Connector: Bosch EV1

• Driver Profile: XDI, tuning changes needed

• Tuning Support:  Standalone, HPT, MoTeC

• Idle Stability: 0.8 ms at 20 bar

• Static Flow Reference: 10 ms at 100 bar

• WOT Performance and Stability: 6 ms at 200 bar

• Tuning Support: Compatible with HP Tuners and standalone ECUs. Note: Manual cars may experience significant pressure overshoots after shifting, which can cause misfires. Reducing pressure may be necessary in these cases.

Applications;

•High horsepower GM Gen V V8 and V6 direct injection engines including LT4, LT1, L86, L83 and LV3
•E85 conversions of GM Gen V V8 and V6 engines
•2014-2019 C7 Corvette (LT1)
•2015-2019 C7 Z06 Corvette (LT4)
•2016-2022 Camaro SS (LT1)
•2016-2019 CTS-V (LT4)
•2020-2024 CT5-V Black Wing (LT4)
•2017-2023 ZL1 Camaro (LT4)
•2014-2023 Silverado and Sierra with 4.3L LV3, 5.3L L83 and 6.2L L86 engines Not compatible with 6mm shaft injectors
•2015-2023 Suburban, Tahoe, Yukon and Escalade with 5.3L L83 and 6.2L L86 engines Not compatible with 6mm shaft injector

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 RGX HPFP. Important: Note; the RGX and +70% injectors may not meet fueling demands for setups with a 2650 TVS or Whipple blower on straight E85 over 1,100rwhp. In these cases, we recommend supplemental fueling (methanol, PFI) around peak torque, or plan on blending down to the E50/60 range. Planning for more than 1,100rwhp? Then ask us how we can help set you up with a TooHigh PSI Port System to supplement your OEM Di System.

*Global B ECUs may require extra tuning on a case-by-case basis as we learn more about new models. We do not accept returns due to tuning difficulties, but we’re happy to assist with any technical inquiries.

All performance figures are estimates only, assume a fully supported setup, and competent tuner who has experience tuning XDI products. Your results will vary. Final rail pressure should be determined by your tuner. Injectors are non-returnable.

Injectors / HPFP may ship direct from XDI.

INSTALLATION: As you may be aware, these are high tolerance, high performance parts that require a very detailed installation procedure. Not only do you need to make sure you have a quality fuel filter system of 10-microns or less, you need to ensure your pre-load for the HPFP and fastening procedure is followed perfectly. Please email us if you have any questions info@griffin-motorsports.com

PRE-LOAD and LASH “how to” video can be watched HERE

XDI - INSTALL INSTRUCTIONS CAN BE DOWNLOADED HERE.

Compatible with Gen 5 GM LT V8 Engines, including:

• 2014-2019 Chevrolet Corvette C7 (LT1, LT4)

• 2023-2025 Chevrolet Corvette E-Ray (LT2)

• 2020-2025 Chevrolet Corvette C8 (LT2)

• 2016-2023 Chevrolet Camaro SS (LT1)

• 2017-2023 Chevrolet Camaro ZL1 (LT4)

• 2014-2017 Chevrolet SS Sedan (LT1)

• 2015-2023 Cadillac CTS-V (LT4)

• 2016-2023 Cadillac CT6 (LT4, select trims)

• 2014-2023 Chevrolet Silverado/GMC Sierra (LT1, select trims)

• 2015-2023 Chevrolet Suburban/Tahoe (LT1, select trims)

What YOU will need to provide:

• Patience and attention to detail for installation... or, someone like that, who you trust with your beloved, adorned, magnificent, earth shaking, alarm sounding LT4 powered beast! If you are doing this DIY (which is not that bad) be sure to get an extra set of hands. These superchargers are alot heavier than some imagine.

• We strongly suggest upgrading your cooling system while the blower is out of the car because alot of the labor needed to upgrade is already done with the coolant system bleed and blower out of the car. Email us at info@griffin-motorsports.com to discuss your particular set up if you need help, or want to discuss options.

• Although many people have had luck reusing the GM supercharger bolts, Fuel Feed Pipe, and Fuel Crossover Pipe, we strongly suggest you add these items to your cart, as these are ALL one time use only parts.

• This package will require tuning. Email us at info@griffin-motorsports.com if you need a recommendation for a remote tuner.