Why a Proper E85 Fuel System Matters for a 600+ HP 2JZ-GTE

Building a 2JZ-GTE to the 600+ horsepower threshold is a milestone many enthusiasts aim for. The legendary Toyota inline-six is known for its robust bottom end and iron block, making it a prime candidate for serious power. However, the stock fuel system is not designed to handle the increased flow demands of E85 at these output levels. E85, a blend of 85% ethanol and 15% gasoline, offers a higher octane rating and superior cooling properties, allowing for more aggressive ignition timing and higher boost without detonation. But it also requires roughly 30% more fuel volume than pump gasoline to achieve the same air-fuel ratio. This makes a dedicated, high-flow fuel system not just an upgrade but a necessity for reliability and performance. The DeatschWerks E85 fuel system is a popular, well-engineered solution that addresses these demands directly.

In this guide, we break down every cost associated with installing a DeatschWerks E85 fuel system on a 2JZ-GTE, including parts, labor, tuning, and unexpected expenses. Whether you are a seasoned DIY mechanic or plan to have a shop handle the work, understanding the true cost of this upgrade will help you budget effectively and avoid common pitfalls.

System Overview: What the DeatschWerks E85 Package Includes

DeatschWerks offers a comprehensive fuel system solution for the 2JZ-GTE that is specifically engineered for E85 compatibility. Unlike generic fuel system components, their parts are designed with ethanol-resistant materials to prevent corrosion and swelling over time. The core components include a high-flow in-tank pump, a set of injectors matched to the pump's output, a fuel pressure regulator, and the necessary lines and fittings. The system is designed to support up to 800+ horsepower on E85, providing a comfortable safety margin for a 600+ HP target. Key specifications include a pump capable of delivering over 400 liters per hour at 58 psi and injectors sized at 1300 cc/min, which are more than adequate for the flow requirements of a high-boost 2JZ.

Detailed Cost Breakdown

Parts Costs

The parts list below reflects pricing as of early 2025 and assumes you are purchasing new components from reputable suppliers. Prices can vary based on sales, vendor choice, and whether you buy individual pieces or a complete kit.

  • DeatschWerks DW400 In-Tank Fuel Pump (part number 9-2040-1000): $310. This pump is a direct-fit upgrade for the 2JZ-GTE and handles E85 with ease. It is brushless and capable of supporting 800+ HP on E85.
  • DeatschWerks 1300cc/min Injectors (set of 6, part number 9-01300-4604): $620. These high-impedance injectors feature a stainless steel design and are flow-matched for consistent delivery across all cylinders.
  • DeatschWerks X-Series Fuel Pressure Regulator (for return-style systems): $165. This regulator maintains a stable 1:1 rise rate with boost, ensuring proper fuel pressure under load.
  • AN Fuel Lines and Fittings (including -6AN feed and -8AN return line, push-lock hose, and threaded adapters): $140. E85 requires lines that do not degrade, and DeatschWerks push-lock hose is compatible with ethanol.
  • DeatschWerks In-Line Fuel Filter (10-micron): $55. A high-flow filter that traps contaminants without restricting flow.
  • Miscellaneous Hardware (clamps, gaskets, sealants, zip ties, electrical connectors): $55. This includes an upgrade to a 40-amp fuel pump relay and wiring kit, which is recommended for the higher current draw.

Total Parts Cost (estimated): $1,345

If you opt for a pre-assembled DeatschWerks 2JZ-GTE E85 fuel system kit, you may save roughly 5-10% over buying individual components. Check with vendors like MAPerformance or Driftmotion for current pricing.

Labor Costs

Labor rates for a professional installation can vary widely by region and shop reputation. The following estimates assume the vehicle is a typical JZA80 Supra or Aristo, with a standard 2JZ-GTE configuration.

  • Professional labor rate (average): $100–$130 per hour.
  • Estimated installation time: 5–7 hours. This includes draining the fuel tank, removing the old pump and injectors, routing new lines, installing the regulator, and bleeding the fuel system.
  • Total labor cost (at $115/hour average): $575–$805.

If you are experienced with fuel system work, you can save this entire cost. However, be aware that working with E85 requires strict cleanliness to avoid contamination, and mistakes can lead to dangerous fuel leaks. Many owners choose professional installation for peace of mind.

Tuning and Calibration Costs

Installing hardware is only half the equation. A modern standalone ECU or a piggyback system like an AEM F/IC or ECUMaster must be recalibrated to take advantage of the new fuel system. Tuning for E85 at 600+ HP is not a simple "canned map" affair.

  • Dyno tuning session (with wideband AFR logging): $300–$500 for a typical 2–4 hour session.
  • Optional remote tuning (e-mail or live): $200–$350 if you have a compatible ECU and datalogging capability.
  • Fuel system priming and leak check (if no tuning needed immediately): $100–$150 if done as a separate service.
  • Total tuning cost (estimate): $350–$500.

Many shops include a basic idle and cruise calibration in the installation labor, but full-throttle tuning is nearly always billed separately. Do not skip this step—running a 600+ HP 2JZ on E85 without proper tuning can cause engine damage quickly.

Additional and Unexpected Costs

When upgrading fuel systems, there are often hidden costs that first-time builders overlook. Here are common additional expenses you should plan for:

  • Fuel system wiring upgrade (larger gauge wiring, relay, and fuse holder): $40–$60. The stock fuel pump wiring may not handle the higher current of a DW400 pump. A relay wiring kit is recommended.
  • Fuel tank cleaning and anti-rust treatment: $50–$100. Old tanks may contain rust or debris that can clog new filters and injectors.
  • New fuel hanger or modified fuel bucket: $0–$120. Some 2JZ chassis require a small modification to the fuel hanger to fit the DW400 pump properly. A pre-assembled hanger kit is available from DeatschWerks for around $100.
  • Consumables (fuel-safe sealant, thread tape, brake cleaner, towels): $30.
  • Fuel tank removal and reinstallation (if required for hanger access): $100–$200 in additional labor.
  • Smoke test for vapor leaks (recommended after fuel line work): $50–$80.

Total additional costs (estimate): $270–$590.

Grand Total Cost Estimate

Adding all categories together gives a clear picture of the total investment needed for a reliable 600+ HP E85 fuel system upgrade using DeatschWerks components.

  • Parts: $1,345
  • Labor (professional installation): $575–$805
  • Tuning and calibration: $350–$500
  • Additional and hidden costs: $270–$590
  • Grand total range: $2,540–$3,240

If you perform all work yourself and have access to a dyno or tuning software, you can reduce the total to approximately $1,700–$2,000. However, most owners should budget on the high end to avoid surprises.

Choosing the Right Components: A Deep Dive

Fuel Pump Selection: Why the DW400

The DW400 is a brushless, turbine-style pump that offers higher efficiency and longer life than traditional brushed pumps. For a 600+ HP 2JZ-GTE on E85, the pump must deliver at least 280 liters per hour at 60 psi (boost referenced). The DW400 exceeds that by a comfortable margin, delivering 320+ LPH at 60 psi. It is also whisper-quiet compared to older Walbro 255 or 450 pumps. The pump is designed for in-tank use and fits with minor modifications to the factory fuel hanger on most 2JZ chassis.

Injector Sizing and Spray Patterns

DeatschWerks 1300cc injectors are a popular choice for the 600–800 HP range. However, not all injectors perform equally on E85. The DeatschWerks units feature a fine-spray pattern that improves atomization of ethanol, which has a higher latent heat of vaporization than gasoline. This helps with mixture homogeneity and reduces the risk of lean spots, especially in high-rpm, high-boost conditions. The 1300cc size provides enough headroom to avoid exceeding 80% duty cycle at your power target, which is critical for injector longevity.

Fuel Pressure Regulation

A return-style fuel system with a rising-rate regulator is the standard for high-horsepower builds. The DeatschWerks X-Series regulator includes a gauge port and vacuum/boost reference nipple. For 600+ HP, you want a 1:1 rise rate so that fuel pressure increases pound-for-pound with boost pressure, maintaining a constant differential across the injectors. This ensures predictable fueling regardless of boost level. The regulator should be mounted near the fuel rail for best response.

Fuel Lines and Fittings

E85 is corrosive to rubber and some plastics. DeatschWerks push-lock hose is made from synthetic rubber with a fluoroelastomer liner that resists ethanol degradation. Use -6AN for the feed line and -8AN for the return line to handle the volume without excessive restriction. All fittings should be aluminum or stainless steel with anodized coatings. Avoid plated steel fittings, as the coating can flake off and contaminate the fuel system.

Installation Considerations for the DIY Builder

If you plan to install the system yourself, there are several technical details that separate a successful installation from a problematic one:

  1. Fuel system decontamination: Before installing new components, have the fuel tank professionally cleaned or inspect it with a scope. Any debris will quickly clog a 10-micron filter.
  2. Wiring upgrade: Run a dedicated 10 AWG power wire from the battery through a 40-amp relay to the pump. Ground the pump directly to the chassis with a 10 AWG wire. Using the stock wiring can cause voltage drop and reduced pump output.
  3. Fuel pump hanger modification: On Supra and Aristo models, the DW400 pump fits into the stock hanger but may require a slight trimming of the rubber grommet. Follow the included instructions carefully to prevent pump vibration or misalignment.
  4. Injector installation: Replace the injector seals and use a light coat of dielectric grease to prevent leaks. Torque the fuel rail bolts to spec to avoid bending the rail or cracking the intake manifold.
  5. Leak testing: Pressurize the system at the fuel pump relay with a scan tool or jumper wire. Check every fitting and seal while the pump runs. Do not rely on visual inspection alone—use a smoke machine or soapy water on suspect areas.
  6. Bleeding air: After priming, crank the engine without starting (or with the fuel pump relay temporarily disabled) to bleed air from the lines. Then start and check for leaks again.

Tuning for E85: What to Expect on the Dyno

Tuning a 2JZ-GTE on E85 at 600+ HP requires a careful approach. The higher fuel volume and different stoichiometric ratio (around 9.7:1 for E85 vs. 14.7:1 for gasoline) mean your ECU must be recalibrated for both fuel table and ignition timing. A skilled tuner will perform the following steps on the dyno:

  1. Fuel pressure verification: Confirm the regulator maintains 43.5 psi base pressure (vacuum line disconnected) and rises with boost.
  2. Injector scaling and dead-time calibration: Input the correct injector data for the DeatschWerks 1300cc injectors into the ECU. Incorrect dead-time values can cause erratic idle and part-throttle behavior.
  3. Wideband air-fuel ratio mapping: Target 11.5:1–11.8:1 at wide-open throttle to maximize power while keeping exhaust gas temperatures safe.
  4. Ignition timing optimization: E85 can run more timing than pump gas. A typical 600+ HP 2JZ on E85 sees 18–20 degrees of timing at full boost, but this depends on your specific turbo, intercooler, and octane quality.
  5. Boost control and wastegate adjustment: Ensure the boost controller and wastegate reference match the fuel pressure rise rate.

Expect your dyno session to last 2–4 hours, with multiple pulls to dial in the fuel curve and ignition timing safely.

Long-Term Maintenance and Fuel System Longevity

E85 fuel systems require a different maintenance regimen than gasoline. Ethanol attracts moisture, which can lead to corrosion and phase separation if the vehicle sits for extended periods. Plan for the following:

  • Fuel filter replacement: Change the in-line fuel filter every 15,000–20,000 miles or annually. E85 can carry more particulates than gasoline.
  • Fuel system inspection: Annually check all rubber hoses for swelling or cracks. The DeatschWerks push-lock hose has excellent ethanol resistance, but older rubber sections should be replaced.
  • Fuel pump relay and wiring check: Loose connections cause voltage drop and reduce pump life. Inspect every 6 months.
  • Ethanol content testing: Even when purchasing E85, the actual ethanol percentage can vary between 51% and 83% depending on the season and region. Use a tester (available from DeatschWerks) and adjust your tune accordingly if the content drifts significantly.
  • Storage considerations: If the car will be stored for more than 30 days, use a fuel stabilizer designed for ethanol, or run pump gas through the system before storage.

Alternatives and Upgrades Beyond 600 HP

While the DeatschWerks system described here is sufficient for 600–750 HP on E85, if you are targeting 800+ HP, consider these additional upgrades:

  • Dual pump setup: Two DW400 pumps in parallel for flow rates above 500 LPH.
  • Larger injectors: DeatschWerks 1650cc or 2200cc injectors for 800+ HP.
  • Billet fuel rails: Factory 2JZ-GTE fuel rails can flex under high fuel pressure. An aftermarket billet rail with larger bore reduces pressure drop and supports higher flow.
  • Fuel cell upgrade: For race applications, a dedicated fuel cell with internal baffling prevents starvation during high-G cornering.

These upgrades add $300–$800 to the parts budget but open the door to reliable 800+ WHP operation.

Real-World Owner Experiences

Forum reports from Supra and Aristo owners who have installed the DeatschWerks E85 system consistently highlight three things: the pump is quiet, the injectors idle smoothly even at large size, and the overall install is straightforward with basic mechanical skill. One owner on Supraforums reported a total cost of $2,800 including professional installation and a local dyno tune, with his car making 635 whp on 22 psi with a Precision 6266 turbo. Another DIY owner spent $1,650 by installing the system himself and using a remote tuning service. The common takeaway is that the DeatschWerks system provides a reliable foundation without the need to mix and match parts from multiple manufacturers.

Final Considerations Before Pulling the Trigger

Before purchasing, check your current fuel system configuration. If you still have the stock non-return system (with the pressure regulator in the tank), you will need to convert to a return-style system, which adds extra labor and some additional fittings. Verify that your ECU supports the required injector sizing and that it can run a flex-fuel sensor if you plan to alternate between E85 and pump gas. Some owners use a Flex Fuel setup to automatically adjust the tune for varying ethanol content—this adds approximately $200–$300 for a GM-style flex fuel sensor and controller but provides flexibility.

For most builders targeting 600+ HP on E85, the DeatschWerks E85 fuel system represents a proven, cost-effective solution. The total investment of $2,500–$3,200 is modest compared to the cost of a blown engine caused by fuel starvation or improper system design. By planning for all costs—parts, labor, tuning, and maintenance—you ensure your 2JZ-GTE build is not only powerful but reliable for years of aggressive driving.

For a deeper technical look at E85 fuel system design, refer to the comprehensive guide on DeatschWerks' E85 knowledge base. To compare injector flow requirements, check the RC Engineering fuel calculations page. For community build logs and dyno results, Supraforums offers an extensive 2JZ-GTE technical forum.