Can the V35A-FTS Be Tuned? A Guide to ECU Tuning and Piggyback Systems – Toyota V35A-FTS tuning

Is V35A-FTS Adjustable? A Guide to ECU Tuning and Piggyback Systems — Toyota V35A-FTS Tuning

Toyota V35A-FTS tuning

If you’ve been eyeing the Toyota V35A-FTS engine for your next build, project car, or power upgrade, you’re not alone. This 3.4L twin-turbocharged V6 engine has made waves in performance circles since it debuted in vehicles like the Lexus LS500, Toyota Tundra, and Land Cruiser 300 Series. With cutting-edge engineering, direct and port fuel injection, and a beefy twin-turbo setup, this engine has massive potential. Toyota V35A-FTS tuning

But the question on everyone’s mind is:
Is the V35A-FTS tunable?

The short answer: yes—but with some very important qualifications.

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What You’ll Learn in This Guide

• What makes the V35A-FTS engine special
• The factory settings
• How ECU tuning on the V35A is done
• Piggyback system alternatives
• Challenges and benefits of tuning
• Why the V35A-FTS is an investment worth making
• ✅ And yes, we do sell these engines

So let’s get started.

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What Is the Toyota V35A-FTS Engine?

The 3.4-liter twin-turbo V6 Toyota V35A-FTS engine was employed by the 2018 Lexus LS500 and now the 2022+ Toyota Sequoia and Tundra. It was created to replace the old 3UR-FE V8 with better fuel efficiency, higher torque, and better emissions performance—yet all without losing power.

🔧 V35A-FTS Engine Specs:

• Engine Code: V35A-FTS
• Displacement: 3.4L (3445cc)
• Configuration: 60° V6
• Aspiration: Twin Turbocharged
• Fuel System: D-4ST (Direct + Port Fuel Injection)
• Valvetrain: DOHC, 24 valves, Dual VVT-i
• Compression Ratio: 10.5:1
• Horsepower: Up to 437 HP (on i-Force Max Tundra Hybrid)
• Torque: Up to 583 lb-ft
• Turbochargers: Two single-scroll turbos
• Block Material: Aluminum alloy
• Redline: ~5800–6000 RPM

This engine is especially famous for its low-end torque and throttle response, so it’s little surprise that it’s become a go-to pick for tuners.

✅ Want to purchase a V35A-FTS engine? We provide fully tested, low-mileage engines with full spec information. Instant prices and availability.

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Is the V35A-FTS Tunable?

The Short Answer: Yes—but it’s not easy.

Since the V35A-FTS is a modern engine with advanced electronics, it is tunable—but you’ll need the correct tools, software, and know-how.

Whether you want better throttle response, more horsepower, or custom boost levels, there are two primary tuning methods:

• ECU (Engine Control Unit) tuning / Flash tuning
• Piggyback tuning systems

Let’s break them down.

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ECU Tuning for the V35A-FTS

ECU tuning involves reprogramming the onboard computer to improve performance factors such as ignition timing, fuel injection, turbo boost, and throttle response.

✅ Benefits of ECU Tuning:

• Full access to factory maps and sensors
• Can modify timing, fuel curves, and boost pressures
• More accurate and efficient than piggyback systems
• Unlocks hidden horsepower and torque

🔒 The Toyota ECU Challenge

Toyota’s newer ECUs, like those in the V35A-FTS, are encrypted and locked down. That means you can’t just plug in a tool and flash it like older motors.

To tune the V35A-FTS, you’ll need:

• Bench unlocking or virtual read/write methods
• Specialized software (EcuTek, HP Tuners, or custom solutions)
• A professional tuner familiar with Toyota ECUs

Currently, some tuning shops offer partial support for the V35A platform—especially in the LS500 and Tundra communities.

📈 How Much Power Can You Gain?

• On factory turbos, expect gains of 40–80 HP and 80–120 lb-ft of torque with a conservative ECU flash.
• With aftermarket turbos, intercoolers, and fuel upgrades, 600+ HP is absolutely achievable.

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Piggyback Systems for the V35A-FTS

A piggyback system is a standalone module that intercepts and modifies sensor signals going to and from the ECU.

They’re often used when direct ECU tuning isn’t yet fully available.

🧰 Popular Piggyback Systems:

• JB4 by Burger Motorsports
• Unichip Q+
• ECU Master DET3
• AEM FIC-8

⚙️ How Do Piggyback Systems Work?

These devices adjust input signals like boost pressure, throttle position, and fuel trims, effectively “tricking” the ECU into making more power—while keeping factory safety protocols in place.

✅ Piggyback Benefits:

• No ECU unlocking required
• Quick to install and remove
• Smartphone control (on some models)
• Affordable and reversible

⚠️ Piggyback Drawbacks:

• Less control than ECU tuning
• Risk of CELs or limp mode if not configured correctly
• Cannot adjust transmission tuning or fuel maps directly

Piggybacks are ideal for daily drivers or leased vehicles looking for moderate gains without risking warranty flags.

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Supporting Mods for V35A Tuning

Tuning increases power—and therefore heat and stress. These supporting modifications help keep the engine healthy and maximize gains:

🔧 Recommended Supporting Mods:

• Upgraded intercooler – reduces intake temps
• High-flow air intake – enhances throttle response
• Downpipes / exhaust system – improves flow, reduces backpressure
• Fuel system upgrades – essential for high-boost setups
• Oil catch can – prevents carbon buildup and blow-by
• Transmission tune – for better shifting and torque management

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Tuning Across Different Platforms

🚗 Lexus LS500:

• Smooth, luxury performance sedan
• ECU or piggyback tuning enhances response without ruining refinement
• Great base for stealth or sleeper builds

🛻 Toyota Tundra / Sequoia:

• Tuning improves towing torque and responsiveness
• Excellent platform for off-roaders and overlanders
• Intake + exhaust + tune = massive gains

🌍 Land Cruiser 300 Series:

• Global overlanding and adventure vehicle
• ECU tuning cuts turbo lag and increases crawl torque
• Piggybacks used in areas with strict emissions laws

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Frequently Asked Questions About V35A-FTS Tuning

❓ Will tuning invalidate my warranty?

Yes. Both ECU tuning and piggybacks can void your powertrain warranty. Some tuners offer “stealth” solutions that are harder to detect.

❓ Is the V35A reliable when tuned?

Yes, with limits. The V35A-FTS has forged internals and is built for boost. However, pushing past 600 HP will require internal upgrades and extra cooling.

❓ Can I tune the V35A myself?

Technically, yes—if you have the software, hardware, and technical knowledge. But due to Toyota’s complex encrypted ECUs, it’s safer to use a pro tuner or plug-and-play piggyback.

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Why the V35A-FTS Is a Smart Engine Upgrade or Replacement

This engine is a favorite with tuners and engine swap enthusiasts for many reasons:

• Twin-turbocharged from the factory
• Lightweight aluminum block
• Strong low-end torque
• Modern emissions compliance
• Scalable intake and fuel system
• Compact size compared to old V8s

Whether it’s for a drift car, off-road rig, or sleeper project, the V35A-FTS offers a clean, powerful, and efficient power solution.

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✅ Yes, We Sell the V35A-FTS Engine

Looking to buy a V35A-FTS? You’ve come to the right place.

We offer low-mileage, high-quality Toyota and Lexus V35A engines sourced from:

• Lexus LS500
• Toyota Tundra
• Toyota Sequoia
• Land Cruiser 300 Series

🛒 Why Buy From Us?

• ✅ Quality-tested and warrantied
• ✅ Compression and leakdown tested
• ✅ Includes turbos, sensors, wiring harness (varies by unit)
• ✅ Fast global shipping & expert support
• ✅ Competitive pricing

Whether you’re an individual builder, tuning shop, or importer, we’re here to help you complete your build with a V35A-FTS you can trust.

📞 Call us today to check stock or request a quote.

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🔚 Final Thoughts: Should You Tune the V35A-FTS?

Absolutely—if done properly. The V35A-FTS has the potential to deliver massive gains safely. Whether you want 500 HP or 700+, this engine is built to handle boost with the right tuning.

With more tuning support emerging every day, the V35A-FTS is becoming one of the most exciting modern engines to modify.

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🎯 Ready to Step Up?

📦 Contact us now to get pricing, availability, and shipping options on your V35A-FTS engine—and bring your build to life today.

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