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Understanding E85 Fuel and Its Advantages for Performance Vehicles
E85 fuel, a blend of 85% ethanol and 15% gasoline, has become a popular choice among performance vehicle owners in Nashville due to its high octane rating and cooling properties. The increased octane rating, typically between 100 and 105, allows for more aggressive ignition timing and higher boost pressures without detonation. Additionally, ethanol’s high latent heat of vaporization cools the intake charge, reducing intake air temperatures and further suppressing knock. This combination enables significant power gains over pump gasoline when the engine is properly tuned. For Nashville drivers who attend track days at Music City Motorplex or run their cars on the street, an E85 conversion can unlock up to 20–30% more horsepower compared to running standard 93 octane fuel, depending on the forced induction setup.
Beyond raw power, E85 offers practical benefits specific to the Nashville area. Many local gas stations carry E85 at prices that can be $0.50 to $1.00 less per gallon than premium unleaded, providing daily driving cost savings. Ethanol is also a domestically produced fuel, reducing reliance on foreign oil, and it burns cleaner than gasoline, producing fewer tailpipe emissions. For performance enthusiasts who want to combine horsepower with a smaller environmental footprint, E85 conversion is a compelling upgrade.
Key Components of an E85 Conversion Kit
A complete E85 conversion kit typically includes several components designed to handle ethanol's corrosive nature and higher fuel flow requirements. Understanding these parts helps Nashville vehicle owners select the right kit and avoid compatibility issues.
High-Flow Fuel Injectors
E85 requires roughly 30–40% more fuel volume than gasoline to achieve the same air-fuel ratio due to its lower energy density. Standard injectors quickly reach their duty cycle limit. A quality conversion kit includes injectors sized appropriately for the target horsepower level—commonly 1000cc to 1300cc for moderate builds and 2000cc or larger for high-boost applications. Look for injectors with ethanol-resistant seals and materials.
Fuel Pump and Pressure Regulator
The factory fuel pump often cannot supply enough volume for E85. Kits include a high-flow in-tank or inline pump, such as a Walbro 525 or AEM 340lph model, along with an adjustable fuel pressure regulator to maintain consistent pressure under wide-open throttle. Some kits also include a fuel pump controller or rewire harness to handle increased current draw.
Fuel Lines and Fittings
Ethanol can corrode rubber and older nylon fuel lines. Most conversion kits provide PTFE-lined (Teflon) hoses and stainless steel or nickel-plated brass fittings that resist ethanol degradation. For Nashville vehicles with existing aftermarket fuel systems, verify that lines are ethanol-compatible; otherwise, replacement is necessary.
Flex-Fuel Sensor and Wiring
Flex-fuel capability allows the engine to automatically adjust timing and fuel delivery for varying ethanol content, from E0 to E85. A flex-fuel sensor (e.g., GM style or Bosch) sends the ethanol percentage signal to the ECU. Kits include the sensor, pigtail, and wiring harness for integration with aftermarket engine management systems like Holley Terminator X, FuelTech, or Motec.
Engine Control Software/Tune
No conversion is complete without a proper calibration. Many kits include a preloaded tune file for common platforms (LS, LT, Coyote, EcoBoost), while others require professional dyno tuning. The ECU must be programmed to target richer air-fuel ratios (around 9.0–9.8:1) for E85 and to accommodate increased fuel flow.
Top E85 Conversion Kits for Nashville Vehicles
Nashville's performance community spans a wide range of vehicles—from late-model muscle cars and turbo imports to lifted trucks. The following kits have proven reliable on local builds and are available through regional or online suppliers.
1. FuelTech FT550 Flex-Fuel System
The FuelTech FT550 is a stand-alone engine management system with built-in flex-fuel control. It comes with a premium ethanol sensor, wiring harness, and software that supports real-time ethanol content adjustment. The kit is ideal for heavily modified cars running 1000+ horsepower, as it offers eight injector outputs, dual knock control, and onboard datalogging. Nashville tuners appreciate the FT550's ability to seamlessly switch between gasoline and E85 without requiring a reflash. The system is compatible with virtually any engine—LS, Gen 3 Hemi, 2JZ, and more. Pricing starts around $1,800 for the base system, excluding injectors and pump.
2. AEM Flex-Fuel Kit (30-2130)
AEM’s Flex-Fuel Kit is a popular choice for Nashville enthusiasts running AEM Infinity, Series 2, or even factory ECUs with a separate controller. The kit includes a robust ethanol content sensor, plug-and-play harness, and a calibration tool for selecting fuel blend parameters. Its compact design fits easily into engine bays of vehicles like the C6 Corvette, Ford Mustang GT, and BMW N54. Installation is straightforward, and AEM provides technical support for custom tuning. Estimated power gains on a moderate setup are 20–40 whp when swapping from pump gas to E85. Retail price is approximately $350–$450.
3. APS Power Flex Fuel Kit
APS Performance offers a comprehensive flex-fuel conversion kit designed for forced induction applications. It includes a 525lph fuel pump, PTFE-lined hoses, -6AN fittings, ethanol sensor, and a programmable fuel controller. The kit supports up to 1,200 horsepower on E85 and is compatible with both carbureted and EFI systems. It's a favorite among Nashville's turbocharged Supra and Nissan GT-R owners due to its plug-and-play nature and robust build quality. APS offers custom calibration for specific vehicle platforms. Prices range from $1,200 to $1,800 depending on component selection.
4. Radium Engineering Dual Pump Hanger with Flex-Fuel
For vehicles requiring massive fuel volume (800+ whp), Radium Engineering's dual in-tank pump hanger assembly includes provisions for an ethanol sensor and supports two pumps (e.g., two 525lph units). The hanger is CNC-machined from billet aluminum and uses ethanol-resistant PFTE feed lines. It is vehicle-specific for popular platforms like Subaru WRX/STI, Mitsubishi Evo, BMW E9X, and Honda S2000. While not a complete "kit" alone, it is often combined with Radium's flex-fuel sensor kit and necessary injectors. This setup is preferred by Nashville shops that build dedicated race cars and want the utmost reliability.
5. DeatschWerks DW400 Flex-Fuel Ready Pump and Injectors
DeatschWerks offers a cost-effective solution for mild E85 conversions up to 650 horsepower. Their DW400 in-tank fuel pump (265lph at 43 psi) is ethanol-safe and comes with a wiring kit. Combined with their 1000cc or 1300cc injectors, the package provides reliable fuel delivery for street-performance vehicles. The kit works with most factory ECUs after a custom tune. It's a budget-friendly option for Nashville drivers with cars like the Ford Focus RS, Mazdaspeed3, or Nissan 350Z.
Installation Considerations and Professional Tuning in Nashville
Installing an E85 conversion kit requires mechanical experience with fuel systems and ECU tuning. For most Nashville performance enthusiasts, professional installation and dyno tuning are strongly recommended to maximize safety and power output.
Ethanol Compatibility of Existing Components
Before installing a kit, inspect all fuel system parts that contact fuel: the fuel tank, filler neck, rubber hoses, o-rings, gaskets, and fuel filter. Ethanol can degrade rubber and cause swelling or cracking. Replace any non-compatible components with ethanol-rated versions. Stainless steel or PTFE braided lines are preferred. For older vehicles (pre-2000), the fuel tank may require cleaning and coating to handle ethanol.
Fuel System Flow and Pressure Testing
After installation, perform a fuel pressure and flow test at the rail to confirm the pump and regulator provide adequate volume under boost. A typical target is 58–60 psi base pressure for return-style systems. Many Nashville tuners use a pressure gauge and graduated cylinder to measure flow at idle and wide-open throttle.
Dyno Tuning for E85
E85 requires a different tuning strategy than gasoline. The air-fuel ratio target is richer (lambda 0.70–0.85), and ignition timing can be advanced significantly. Professional tuners in Nashville, such as Nashville Tuning Solutions and Music City Motorsports, offer custom dyno calibrations for Holley, HP Tuners, Cobb AccessPort, and other platforms. Expect to pay $400–$800 for a full E85 dyno tune, which includes several pulls to optimize power and safety.
Important: Running E85 without a proper tune can cause engine damage from detonation or excessively rich mixtures. Always consult a qualified tuner before driving the vehicle on E85.
Nashville-Specific Factors: Fuel Availability and Regulations
Nashville has a growing network of E85 stations, though availability varies by area. According to popular fuel tracker sites, there are at least 25 E85 pumps within a 30-minute drive of downtown, with concentrations along the I-24/I-65 corridors and in suburban centers like Murfreesboro, Franklin, and Hendersonville. Major retailers include Mapco Express, Murphy USA, Shell, and Kroger. However, not all stations carry E85 year-round; blend percentages can drop to E70 during winter months to aid cold starts. A flex-fuel sensor automatically adjusts for varying ethanol content, making flex-fuel kits a superior choice.
Check E85 Prices and Stations Near Nashville
Tennessee does not have specific regulations prohibiting aftermarket fuel system modifications for street use, but all vehicles must pass an annual emissions inspection in Davidson County. Flexible-fuel conversions that maintain or reduce tailpipe emissions are generally acceptable, as long as they don’t disable factory emission controls. Be sure to keep the catalytic converters in working order and use a tune that stays within legal emissions limits. Some aftermarket ECUs support OBD-II compliance if needed.
Frequently Asked Questions About E85 Conversion Kits
Q: Can I run E85 in my daily driver with an E85 conversion kit?
A: Yes, provided the kit includes flex-fuel capability. A flex-fuel sensor and tune allow the engine to run on any blend from E10 to E85 without issue. However, cold starts in temperatures below 20°F can be difficult on pure E85; some users blend in a gallon of gasoline or use a block heater.
Q: Will E85 damage my fuel injectors or fuel pump?
A: Only if they are not ethanol-rated. High-quality aftermarket injectors use ethanol-resistant materials (stainless steel, Viton, PTFE) that last for many years. Fuel pumps with brushed motors or plastic components may fail prematurely if used with ethanol. Always choose pumps explicitly labeled as E85-compatible.
Q: How much horsepower gain can I expect from an E85 conversion?
A: Typical gains range from 5–15% on naturally aspirated engines and 15–30% on turbocharged or supercharged engines when tuned properly. The exact gain depends on fuel system capacity, ignition timing increases, and whether the original fuel was limiting power due to knock.
Q: Can I install an E85 conversion kit myself?
A: If you are experienced with fuel system upgrades (replacing lines, pump, injectors) and can wire the flex-fuel sensor, a DIY installation is possible. However, the ECU tuning must be done by a professional unless you have experience with aftermarket engine management. Many manufacturers recommend professional install for warranty support.
Q: Is E85 bad for my engine in the long term?
A: No, ethanol itself is not harmful. In fact, it reduces carbon deposits and engine wear due to its cooling effect. However, if the fuel system is not properly sealed with ethanol-compatible materials, leaks can occur. Routine oil changes are still critical because ethanol can cause fuel dilution in the oil if the engine runs rich—use a high-quality oil tested with ethanol blends.
Q: Do I need to replace my fuel tank for E85?
A: Not necessarily. Modern steel fuel tanks are fine; older tanks with internal rust may need cleaning. Some plastic tanks can swell with ethanol, but most OEM tanks since the 1990s are ethanol-tolerant. If you have concerns, consult a specialist.
Conclusion
Converting your performance vehicle to run on E85 is one of the most effective modifications for unlocking additional horsepower and improving overall drivability in Nashville’s climate and driving environment. With a carefully selected E85 conversion kit—whether a complete stand-alone system like the FuelTech FT550, a modular kit from AEM, or a vehicle-specific solution from APS or Radium—you can achieve significant power gains while potentially saving on fuel costs. Remember to prioritize ethanol-compatible components, professional tuning, and an understanding of local fuel availability. By investing in a quality conversion, your Nashville performance car will perform at its peak at the track, on the backroads, or during daily commutes.
Ready to start your E85 conversion? Contact a local Nashville tuner or visit the manufacturer websites listed above to find the best kit for your vehicle and driving goals.