Calling all Tuners

Dear Tuners & Builders,

You've seen it all—from gimmicky signal modifiers to flashy capacitors that promise performance but deliver little more than disappointment. As a tuner or builder, your reputation depends on supporting products that offer real performance, proven reliability, and uncompromising safety for your customers.

When it comes to E85 fueling, eFlexFuel kits stand apart from traditional E85 tuning approaches. We understand that in the tuning world, “different” can raise red flags. But with eFlexFuel, different means better. Our kits are a premium, effective solution to add to your toolbox—helping you deliver top-tier E85 fueling without compromise.

New to eFlexFuel? We encourage you to review this technical overview with an open mind. If you haven’t held one of our Control Units or explored its capabilities firsthand, you may be underestimating its potential.

We’re not here to replace ECU-based E85 tuning—it has its place. Our goal is to provide tuners and builders with an additional high-quality E85 fueling solution that complements your builds and enhances the customer experience.

Not every customer wants to commit to a fixed ethanol percentage, unlock their ECU, or manage maps and fuel blends manually. Our kit offers flexibility: grab the E85 handle when available, or fill up with gasoline when it’s not—no tuning, no hassle.

Sincerely,
The R&D Team at eFlexFuel

Now let’s cut through the noise and focus on what matters: real gains, precise fueling control, reliability, and everyday flexibility.

First, What eFlexFuel Kits Actually Do (and Don’t Do)

eFlexFuel Kits DO

• Enable seamless operation on E85, gasoline, or any blend—automatically.
• Dynamically adjust injector pulse width based on ethanol content to maintain proper stoichiometry.
• Manage only the ethanol-specific fueling, leaving baseline fueling untouched.
• eFlexPro includes built-in Load and RPM calculations—no external sensors required.
• Supports custom 3D fuel mapping (Load × RPM × Fuel Delivery) for precise ethanol fueling and target AFR/Lambda control.
• Offers injector deadtime/latency adjustment for smooth operation with larger injectors at low loads.
• Supports Bluetooth connectivity via the free eFlexApp and eFlexTuner software.
• Includes 2× optional 0–5V analog inputs for advanced tuning via eFlexTuner.
• Backed by a 5-year warranty with free product registration.

eFlexFuel Kits DO NOT

• Modify the vehicle’s ECU or OBD systems.
• Alter ignition timing or boost control.
• Trigger check engine lights (CEL/SES).
• Require special tuning (except minor deadtime adjustments for large injectors).
• Require map switching, fuel testing, or manual input from the driver.

Dyno-Proven Gains: No Timing or Boost Adjustments

The Takeaway:

These gains are achieved solely through eFlexFuel’s intelligent fueling adjustments based on ethanol content—no changes to timing or boost. The dyno results reflect out-of-the-box performance. Optional AFR tuning can further enhance results, allowing engines to fully capitalize on ethanol’s high octane, faster combustion, and cooling properties.

Why Tuners Are Turning to eFlexFuel for E85 Flex Fuel Tuning

1. It Complements, Not Competes

• eFlexPro doesn’t interfere with your ECU or override your calibrations. It adds a dynamic, ethanol-aware fueling layer on top of your optimized gasoline tune.
• You maintain full control over timing, boost, and advanced strategies—while eFlexFuel handles ethanol-specific fueling adjustments.

2. Injector Size? No Problem.

• eFlexTuner provides precise deadtime and latency adjustments, ensuring smooth idle and accurate fueling even with large injectors.
• Percentage-based corrections mean eFlexFuel scales fueling for any injector size—from OEM to 1,500cc+—as long as your gasoline tune is solid.

3. Real Tuning Tools

• 3D Fuel Mapping: Adjust ethanol fueling by RPM, load, blend percentage, or sensor input—just like traditional tuning platforms.
• Wideband Integration: Log AFR via 0–5V analog input. Analyze and refine with precision.
• Autotune (Beta): Use wideband logs to auto-generate maps based on real-world lambda data.

4. Fuel-Based Logic with Custom Capabilities

• Not tied to a specific injector size or vehicle. While harnesses and ethanol sensor adapters are vehicle-specific, the control unit and software are universal.
• Works flawlessly on everything from bolt-on street builds to high-horsepower standalone ECU setups.

Addressing Tuner Concerns Head-On

“What About Big Injectors?”

• Deadtime Tool: Adjust injector latency in eFlexTuner to eliminate rich stumbles or lean spikes at low load.
• Percentage-Based Corrections: Scales with injector size. Just ensure your pump gas tune is solid—eFlexFuel handles the rest.

“No timing control? There won’t be any gains.”

• Dyno results prove otherwise. eFlexFuel + E85 delivers real gains without timing changes.
• While timing adjustments can enhance performance, the core gains come from optimized fueling and ethanol’s inherent properties—like faster flame speed, charge cooling, and high oxygen content.

“It’s just a piggyback—I can’t trust it on a high-dollar build.”

• eFlexPro is engineered for everything from stock vehicles to high-performance builds. With VelvetTouch+ signal processing, optional sensor integration, and advanced mapping, it’s a real-time, data-driven controller—not a basic resistor box.

“I need to see the data and make my own maps.”

• eFlexTuner offers full 3D mapping, datalogging, and analog sensor integration. If you can tune an ECU, you can tune ethanol AFRs with eFlexTuner—without risking ECU lockouts or bricking.

“What if I’m unsure whether my customer’s fuel system is ready for E85?”

• We verify compatibility for every order. Just list your mods—especially injectors and fuel system type—and we’ll confirm flow and connectors before shipping. System safeguards prevent lean conditions or injector overdrive.

Strengths and Limitations: Straight Talk

Pro Tuning Workflow: How Tuners Use eFlexFuel with Custom Tuning

1. Dial In Your Custom Gasoline Tune
   Use HP Tuners, Cobb, VFTuner, or your preferred platform to set timing, boost, and fueling for pump gas.
2. Confirm Fuel System Capacity
   Most OEM fuel systems support eFlexFuel + E85. Use our B2B portal or configurator to confirm. High-power builds may need upgraded injectors and pumps.
3. Install eFlexPro
   No ECU flashing or OBD interference. Uses existing sensors and injectors.
4. (Optional) Map Ethanol Fueling
   • Dyno or Street: Adjust 3D maps while monitoring wideband. Immediate results.
   • Wideband Logging: Wire your wideband to the analog input, log, and refine.
   • Autotune (Beta): Generate maps from wideband logs automatically.
5. Customers Enjoy True Flexibility
   Fill up with gasoline, E85, or any blend—no re-flashing or manual adjustments needed.

How It Works: Tuner-Grade Fuel Control

eFlexPro + eFlexTuner: The Tuner’s Edge

• 3D Fuel Mapping: Adjust AFR by RPM, load, ethanol content, and sensor input—no locked ECU tables.
• Deadtime Adjustments: Fine-tune injector latency for smooth operation, even with large injectors.
• Sensor Integration: Wire in wideband O2, MAP, MAF, or TPS for precision tuning. Supports 0–5V analog signals.
• Virtual Load Sensor: Enables load-based mapping without tapping factory sensors—ideal for standalone ECU builds.

Why It’s Not a Basic Piggyback

• Patented eFlexTuner: Full 3D mapping, deadtime control, and datalogging capabilities.
• Virtual Load Sensor: Enables precise mapping without OEM sensor interference.
• eFlexApp Integration: Monitor ethanol content, injector duty, temps, and switch drive modes via smartphone.
• Wide Injector Compatibility: Percentage-based logic and deadtime tools ensure smooth operation across injector sizes.
• OEM-Grade Reliability: Finnish-engineered, VelvetTouch+ signal processing, and backed by a 5-year warranty.
• Dynamic Fuel-Based Logic: Real-time pulse width correction based on exact ethanol blend.

eFlexFuel: A Tool for E85 Flex-Fuel Performance

If you’re already using a professional tuning platform, you understand the power of E85. But creating a reliable, automatic flex-fuel tune that adjusts to real ethanol percentages is often a challenge. Most kits lack the control, data, and reliability needed for serious builds. That’s where eFlexPro and eFlexTuner come in—providing the precision fueling layer your customers deserve, without interfering with your core ECU strategies.