NEWStanadyne/XDI RGX High-Pressure Fuel Pump
The RGX High-Pressure Fuel Pump is a whole new generation, developed in collaboration with Stanadyne, represents a cutting-edge, modular solution engineered to address the fuel flow limitations of the stock Gen V LT mechanical fuel pump, enabling significantly higher power outputs.
The RGX Fuel Pump demonstrates exceptional performance, supporting over 1,500 horsepower on gasoline and 1,300 horsepower on E85 fuel. These results were achieved exclusively with direct injection (DI) on C16 fuel & turbos with additional testing yielding over 1,300 horsepower on full E85.
It is important to note that these figures reflect engine dyno results and are not directly representative of wheel horsepower (whp) due to drivetrain and supercharger losses. Turbocharged setups have achieved 1,100–1,150 whp, while supercharged configurations with a 2650 supercharger have reached up to 1,000 whp. These benchmarks serve as guidelines, with actual performance varying based on specific drivetrain and forced-induction setups.
RGX Features
- Direct Bolt-In for all GM Gen V LT engines
- 12mm Bore Size for enhanced fuel flow
- Up to 220 bar operating pressure
- Enhanced Spring Design for superior stability at high RPMs
- Improved Volumetric Efficiency over OEM and competing pumps
What’s New: RGX vs Goliath
| Feature |
Goliath |
RGX |
| Plunger Architecture |
Large-plunger |
Improved large-plunger |
| Max Cam Lift |
7.85mm (+38% Fuel Lobe) |
Up to 8.2mm (optimized plunger and retainer) |
| Spring & Spring Seat |
— |
New design |
| Internal Flow Path |
— |
Optimized |
| High-RPM Output |
— |
Consistent high-pressure output at Xtreme RPM |
| LT2 Fitment |
— |
Inlet fitting relocated to fit LT2 engines |
This pump provides a reliable, high-performance fueling solution for extreme builds, ensuring efficient fuel delivery and high RPM stability.
One example for a combination with not enough preload is Aftermarket LTR block and LME valley cover plus a 38% fuel lobe on the camshaft. This one needs a skinnier RGX base plate (-0.060). This is an option to purchase during checkout.
Stanadyne Goliath & RGX Warranty Terms
Stanadyne warrants to Distributor that the Stanadyne Products sold hereunder will be free from defects in material and workmanship for the period of 12 months/12,000 miles from the date of delivery by Stanadyne. Notwithstanding the preceding, and based on the intention of usage of product, all product is sold and provided “as is” and “with all faults” and without warranty of any kind, express or implied. Stanadyne may provide information to Distributor relating to the Stanadyne Products, including information regarding performance, quality, physical properties, weights, etc. Such information is intended as providing general guidance only and does not constitute any part of the basis of any contract between the parties. Such information does not constitute a guarantee or warranty. THIS WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES NOT EXPRESSLY SET FORTH HEREIN, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR CONFORMANCE TO DISTRIBUTOR’S SPECIFICATIONS. Stanadyne’s sole liability and Distributor’s exclusive remedy under this warranty is the repair or replacement, at Stanadyne’s option, of Stanadyne Products not conforming to such warranty that are, at Distributor’s or original end user’s expense, removed from the vehicle or equipment and delivered to Stanadyne or to a person or entity specified by Stanadyne. Stanadyne shall have no liability under this warranty for defects that are not identified within the warranty period. A defect shall be deemed “identified” within the meaning of this paragraph only if (i) the Stanadyne Products have been delivered to Stanadyne (or a person or entity specified by Stanadyne) for the purpose of remedying such defect, or (ii) Stanadyne (or a person or entity specified by Stanadyne) has received a written notice from Distributor or original end user specifying such defect and stating that Distributor or original end user intends to seek warranty coverage promptly.
