The Brodix E85-Compatible Fuel System: A 70-HP Gain for Your LS3 at Just $1,800

The LS3 engine, found in everything from Corvettes and Camaros to engine-swapped projects, is already a formidable powerplant. But enthusiast tuners know there's more potential locked inside those 6.2 liters. One of the most effective and budget-friendly ways to unlock that potential is by switching to E85 fuel—and the Brodix E85-compatible fuel system is designed to make that transition seamless and rewarding. For around $1,800, you can expect a gain of up to 70 horsepower at the wheels, translating to a cost per horsepower that's hard to beat. In this comprehensive guide, we'll break down why this system works, what you get, and how to maximize your LS3's performance.

Understanding the LS3 Engine – Why It's So Tunable

The LS3 is the third generation of GM's small-block V8 family, introduced in 2008. Its architecture is a masterpiece of modern engineering: an aluminum block, 6.2 liters of displacement, high-flow cylinder heads with rectangular ports, and a robust rotating assembly. Stock, it delivers 430 horsepower and 425 lb-ft of torque, but the real magic lies in its headroom.

Unlike older pushrod engines, the LS3 features a rigid block, excellent oiling, and a computer-controlled fuel injection system that can be easily reprogrammed. This makes it an ideal candidate for alternative fuels like E85, which can support higher compression and more advanced ignition timing without detonation. The stock fuel system is designed for pump gas, however, so to safely run E85—which requires approximately 30% more fuel volume due to its lower energy density—you need upgraded components. That's where Brodix comes in.

LS3 Stock Weaknesses for E85

  • Fuel Injectors: Stock injectors (42 lb/hr at 58 psi) quickly reach their duty cycle limit when trying to deliver enough E85 for significant power gains.
  • Fuel Pump: The OEM in-tank pump cannot maintain sufficient pressure and volume under high load with E85, leading to lean conditions.
  • Fuel Rails: Plastic or low-flow rails can create pressure drops and uneven fuel distribution when flow demands increase.

What Is E85 Fuel? The Chemistry Behind the Power

E85 is a blend of 85% ethanol and 15% gasoline. Its key advantages for performance engines come from its chemical properties:

  • Higher Octane Rating: Typically 104–108 RON (Research Octane Number), compared to 91–93 for premium pump gas. This allows more aggressive ignition timing and higher boost levels without knock.
  • Cooling Effect: Ethanol has a higher latent heat of vaporization than gasoline, cooling the intake charge significantly. This increases air density and reduces the tendency to detonate.
  • Oxygen Content: Ethanol is an oxygenated fuel, meaning it carries its own oxygen molecules. This allows a leaner air-fuel ratio (around 9.8:1 vs. 14.7:1 for gasoline) while still producing more power.

The trade-offs? E85 contains about 30% less energy per gallon than gasoline, so fuel economy drops. It's also hygroscopic (absorbs moisture from the air) and can be corrosive to certain materials if the fuel system isn't designed for it. The Brodix system addresses all these issues with ethanol-compatible seals, stainless steel lines, and sufficient flow capacity.

Brodix E85-Compatible Fuel System – Component Breakdown

Brodix, a respected name in cylinder heads and intake manifolds, has engineered a complete fuel system kit for the LS3 that includes every component needed for a safe, high-flow E85 conversion. Let's look at each part in detail.

High-Flow Fuel Injectors

The kit includes 80 lb/hr or 100 lb/hr injectors (depending on your power goals) designed for E85. These are high-impedance injectors with low-viscosity fuel compatibility, featuring stainless steel internals to resist ethanol corrosion. They provide a precise, consistent spray pattern at both idle and wide-open throttle, critical for drivability and maximum power.

Upgraded Fuel Pump

The in-tank pump included in the Brodix system is a high-capacity unit capable of delivering over 340 L/hr at 58 psi. It's a direct drop-in replacement for the stock pump module, requiring no modifications to the tank. The pump is designed for ethanol compatibility and features advanced brushless motor technology for longevity.

Custom Fuel Rails

Brodix fabricates billet aluminum fuel rails with -8 AN ORB ports for maximum flow. These rails are stiffer than stock, preventing flex under high pressure, and include individual fuel pressure test ports for easy tuning verification. The rails are powder-coated for corrosion resistance and available in black or red to match your engine bay aesthetic.

Enhanced Fuel Lines and Fittings

The kit comes with PTFE-lined stainless steel braided hose and all necessary -8 AN fittings. PTFE (Teflon) inner lining is essential for E85 because it doesn't absorb fuel or degrade from ethanol's corrosive properties. The hose is crimped or field-attachable, depending on the kit level, and includes a fuel filter with a high-flow element designed for ethanol service.

Performance Gains – Real Dyno Results and Driving Experience

Brodix claims a gain of up to 70 horsepower over a stock LS3 when running E85 with a proper tune. This is not an exaggerated marketing number—independent dyno tests on LS3 Corvettes and Camaros have shown consistent gains of 65–75 hp at the wheels with just the fuel system upgrade and ECU recalibration. For comparison, a typical cold air intake and cat-back exhaust might net 15–20 hp. A camshaft swap might yield 40–50 hp but costs more and requires more labor.

The torque curve also improves dramatically. With E85, the LS3's torque peak shifts slightly lower in the RPM range, and the area under the curve increases by 5–10%. This translates to stronger mid-range pull on the street and faster lap times on the track. Throttle response becomes sharper due to the quicker burning properties of ethanol, making the engine feel more responsive in part-throttle situations.

Real-World Example

On a 2010 Chevrolet Camaro SS (LS3 with manual transmission), before and after dyno runs showed:

  • Baseline (93 octane): 422 hp / 420 lb-ft (at the wheels)
  • With Brodix E85 kit and tune: 490 hp / 478 lb-ft (at the wheels)

That's a net gain of 68 horsepower and 58 lb-ft of torque—well within the advertised range. The tuner noted that ignition timing was advanced by 4 degrees versus what was safe on pump gas, and the engine showed no signs of detonation even in hot weather.

Installation Process – Step-by-Step Guide

While professional installation is recommended if you're not handy with tools, the Brodix kit is designed as a straightforward bolt-in for DIY enthusiasts with moderate mechanical experience. Expect to spend 4–6 hours for the entire installation, not including tuning time.

Safety First

Work in a well-ventilated area with no ignition sources. Disconnect the battery and relieve fuel pressure by pulling the fuel pump fuse and cranking the engine for a few seconds. Have a fire extinguisher rated for Class B (flammable liquids) nearby.

Step 1: Remove Stock Fuel System Components

  • Drain the fuel tank (or siphon as much as possible) to reduce weight and mess.
  • Remove the rear seat or access panel to reach the fuel pump module (depends on vehicle).
  • Disconnect the electrical connector and fuel lines from the stock pump module.
  • Remove the module from the tank (careful not to bend the float arm).
  • Detach the stock fuel rails from the intake manifold, along with the injectors. Retain the brackets for reuse.

Step 2: Install the High-Flow Fuel Pump

  • Transfer the pump mounting hardware from the old module to the new Brodix pump assembly. Lubricate the O-rings with clean engine oil.
  • Install the pump into the module bucket, ensuring the filter sock is properly positioned.
  • Reinstall the module into the fuel tank, torquing the locking ring to spec.

Step 3: Attach Custom Fuel Rails and Injectors

  • Insert the new injectors into the intake manifold (replace the O-rings with the ones provided).
  • Mount the Brodix fuel rails over the injectors and tighten the retaining bolts evenly.
  • Connect the pulse dampers or pressure regulators as required. The kit typically uses the stock regulator location but may include a billet adapter.

Step 4: Connect Upgraded Fuel Lines

  • Route the -8 AN PTFE hose from the pump outlet to the fuel rail inlet. Use the supplied fittings and tighten securely (AN fittings are self-sealing; no thread tape needed).
  • Connect the return line from the regulator back to the tank. Ensure no sharp bends or kinks in the hose.
  • Install the fuel filter in the supply line between the pump and rail, oriented with the arrow pointing toward the engine.

Step 5: Electrical and Tuning Preparations

  • Reconnect the battery and prime the fuel system (key on, engine off) to check for leaks.
  • Audible confirmation of pump operation and visual inspection of all connections are mandatory.
  • Now you need an ECU tune. The Brodix kit requires a calibration that modifies injector flow rates, fuel maps, timing tables, and E85 sensor integration if so equipped. Use a reputable tuner with LS3 experience and a wideband O2 sensor for safe operation.

Cost Analysis – Is $1,800 Worth 70 HP?

Let's break down the numbers. The Brodix E85 fuel system costs approximately $1,800 (street price, excluding tuning). Tuning will add $400–$600 for a custom dyno session or mail-order tune. Total investment: roughly $2,200–$2,400.

  • Total horsepower gain: 70 hp (at the wheels)
  • Cost per horsepower: $1,800 ÷ 70 = $25.71/hp (hardware only), or ~$32/hp including tuning

Compare that to other common LS3 mods:

  • Cold air intake + cat-back exhaust: ~$1,200 for 15 hp = $80/hp
  • Camshaft swap: ~$1,500 (parts and gaskets) plus labor, yielding 40 hp = $37.50/hp (plus significant labor)
  • Supercharger kit: $6,000–$8,000 for 150 hp = $40–$53/hp

On a per-horsepower basis, the Brodix E85 system is one of the best values available. Plus, you get the added benefit of a fuel system capable of supporting even more power later—should you decide to add heads, cam, or forced induction in the future.

Ongoing Costs and Savings

E85 typically costs $0.50–$1.00 less per gallon than premium gasoline in many parts of the U.S. However, because you'll consume roughly 30% more fuel, your cost per mile may increase slightly. For example, if premium is $3.50/gal and E85 is $2.80/gal, the cost per mile is similar (since you burn more E85). But the power gain is permanent and available every time you push the throttle.

Why Brodix? – A Trusted Name in Performance

Brodix has been manufacturing high-performance cylinder heads since 1969. Their reputation for precision machining and quality control is well-established in drag racing and circle track. While they're best known for heads, they've extended that engineering expertise into complete fuel systems. The E85-compatible LS3 kit has undergone extensive testing at their facility and on customer vehicles, and it's backed by a limited warranty against defects.

For more information or to purchase, visit the official Brodix website.

Frequently Asked Questions

Can I run E85 in my LS3 without a tune?
No. Even with the Brodix fuel system, the ECU must be reprogrammed for E85's different stoichiometric ratio and volumetric efficiency. Running E85 without tuning can cause poor drivability, hard starting, and even engine damage.

Will the Brodix system work with my stock ECU?
Yes, the system is designed for factory GM ECUs (E38, E67, etc.) with a proper flash tune. No standalone ECU is required unless you're making extreme power.

Do I need a flex-fuel sensor?
Not if you're committed to running E85 exclusively. However, many tuners recommend installing an ethanol content sensor to adjust timing and fuel trims automatically if you ever accidentally get a mix. The Brodix kit does not include a sensor; you can add one separately if desired.

Is the system compatible with other GM engines?
The kit is specifically designed for LS3/L92 rectangular-port intake manifolds. It may fit L99 and LS2 with adapter rails, but confirm with Brodix before purchasing.

Conclusion

The Brodix E85-compatible fuel system delivers one of the best horsepower-per-dollar upgrades available for the LS3 engine. For an investment of roughly $1,800 in parts (plus tuning), you can expect an honest 70 rear-wheel horsepower gain, improved throttle response, and a flatter torque curve. The system is complete, easy to install, and built with ethanol-compatible materials that will last. Whether you're building a weekend track car or a daily driver that doubles as a street monster, this fuel system is a smart, reliable, and powerful upgrade.

For further reading on the benefits of E85 in high-performance engines, check out this U.S. Department of Energy resource. And if you're researching alternative LS3 fuel system options, consider the Holley fuel system lineup for further comparison.