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Alientech KESS3 vs Alientech KESS V2: Ultimate Technical Comparison By Simon White, Master Tuning File Writer & IMI Approved Trainer
For over a decade the Alientech KESS V2 has been a go-to tool for ECU remapping professionals, offering stable and reliable performance. However, with the launch of the new Alientech KESS3 we wanted to explore the differences. This article provides a definitive technical comparison of the new Alientech KESS3 and its predecessor, the KESS V2, helping you to understand if it’s time for you to upgrade.
Here is a quick comparison of Alientech KESS3 vs Alientech KESS V2:
| Feature | Alientech KESS V2 | Alientech KESS3 |
| Tuning Methods | OBD Only | OBD Bench and Boot |
| Replaces | Standalone OBD Tool | KESS V2 and K-TAG |
| Processor Speed | Standard | Up to 7x Faster |
| Software | K-Suite | Alientech Suite |
| Vehicle Updates | Discontinued | Active Subscription |
| TCU Support | Limited | Extensive |
Hardware and Processing Power
The most significant upgrade in the KESS3 is its new hardware and processing power. It features a processor that is many times faster than the one in the KESS V2 and has been proven to be at least seven times faster in processing power. The extra speed comes from the higher-performance CPU, faster memory and I/O and streamlined communication protocols. For a professional tuning garage, this speed means a faster turnaround for remapping jobs, saving valuable time in the workshop and better customer service. The KESS3 unit is also newly designed, featuring a protective rubberised layer to help absorb shocks and bumps, making it more durable for a workshop environment.
Tuning Methods: OBD, Bench and Boot
One of the biggest advantages of the Alientech KESS3 is that it combines three different tuning methods into a single tool. The KESS V2 was primarily an OBD tool, meaning it connected to the vehicle’s On-Board Diagnostic port. For more advanced tuning that required a direct connection to the Engine Control Unit (ECU), a separate tool, the K-TAG, was needed.
The KESS3 integrates the functions of both the KESS V2 and K-TAG. It supports:
- OBD Tuning: The standard method of connecting through the diagnostic port. It is quick and easy for a wide range of vehicles.
- Bench Tuning: This method allows you to connect directly to the ECU’s pins without needing to open the unit itself. It provides access for more complex jobs.
- Boot Tuning: For the most in-depth work, Boot mode involves opening the ECU and connecting directly to the circuit board. This gives access to all the unit’s data areas and is often required for the very latest or most protected ECUs.
Having all three methods in one device streamlines the tuning process and removes the expense of buying and maintaining two separate tools.
Vehicle Coverage and Protocols
The Alientech KESS3 offers huge vehicle coverage and a more flexible way of accessing tuning protocols. Protocols are essentially the communication languages needed to talk to different ECUs. With the KESS V2, protocols were often bundled together.
The KESS3 allows for a more tailored approach. You can purchase protocols specifically for the vehicle types you work on, such as cars, motorbikes, agricultural vehicles and marine engines. This is a much clearer and more user-friendly system than the older K-TAG, which required you to purchase protocols by specific ECU families. The list of supported vehicles is constantly updated, ensuring the tool remains relevant for years to come. In the KESS 3 vs KESS 2 debate on coverage, the KESS3 is the clear winner for future-proofing your business.
Software: Alientech Suite vs K-Suite
The KESS3 operates on a brand new software platform called the Alientech Suite. This replaces the older K-Suite software used by the KESS V2 and K-TAG. The Alientech Suite is designed to be much faster, more intuitive and easier to navigate. The streamlined interface helps you select the correct vehicle and tuning method quickly, reducing the time it takes to start a job. This modern software makes the whole tuning process smoother from start to finish.
ECU and TCU Tuning Capabilities
The Alientech KESS3 is designed for comprehensive tuning of both the Engine Control Unit (ECU) and the Transmission Control Unit (TCU). TCU tuning, also known as gearbox remapping, is becoming increasingly popular, allowing for adjustments to gear shift speeds, torque limits and launch control. The KESS3 provides extensive support for TCU tuning across a wide range of modern automatic and dual-clutch transmissions, giving tuners an additional service to offer their customers.
[do you have a specific example of a tune that the KESS v2 couldn’t do that the KESS3 could because of the limitations of using the older tool?]
Understanding Master vs Slave Versions
When purchasing an Alientech KESS3 you will need to choose between a Master or a Slave version. The right choice depends on how you plan to work, you may run a tuning business or it may be a hobby for you. Here’s the two options:
- Master Tool: A Master tool reads and writes files in an open format. This means if you have the knowledge and software like ECM Titanium you can edit the remapping files yourself. You are completely independent and can also manage a network of Slave tools.
- Slave Tool: A Slave tool reads and writes files in an encrypted format that can only be modified by its designated Master. This is perfect for businesses that want to perform the remapping but rely on a trusted file provider for the tuning files. It is a more affordable entry point and connects you to a network of expertise.
The KESS3 Subscription Model Explained
Unlike the KESS V2, the KESS3 operates on a subscription model. This is a significant advantage as it ensures your tool never becomes outdated. An active subscription provides continuous access to the latest protocol updates developed by Alientech. This means as new vehicles and ECUs are released, your KESS3 will be updated to support them. This future-proofs your investment and ensures you can always work on the latest models without needing to buy new hardware.
Things to Consider Before Upgrading
- Initial Protocol Investment: While the KESS3 hardware is a single purchase, protocols for different vehicle types (e.g. Cars, Bikes, Agricultural) are activated separately. This allows you to pay only for what you need but is an important initial cost to factor into your budget.
- Professional Tool Investment: As a genuine, professional-grade tool, the KESS3 represents a significant investment compared to hobbyist tools or risky clones. It is designed for businesses that prioritise safety, reliability and ongoing support.
- Transition to New Software: The KESS3 uses the modern Alientech Suite. While user-friendly, users accustomed to the older K-Suite software for KESS V2 will need to familiarise themselves with the new interface and workflow.
Safety and Recovery Features
The KESS3 is built with key safety features to protect both the user and the vehicle’s ECU. It automatically performs checksum correction, a vital step that ensures the data written to the ECU is not corrupt. It also includes a recovery mode, which means that if the writing process is interrupted for any reason, you can often recover the ECU without it becoming permanently damaged, giving you peace of mind during the tuning process.
KESS3 Myth Busters
When a new tool as advanced as the KESS3 is launched, questions and misconceptions often arise. Let’s address some of the common myths we have seen and provide the reality of what this powerful tool can do.
| The Myth | The Reality |
| “KESS3 is just a rebranded KESS V2” | KESS3 is a completely redesigned all-in-one tuning tool built from the ground up. |
| “KESS3 is too expensive” | It provides better long-term value than competitors by combining multiple tools into one. |
| “KESS3 doesn’t support as many vehicles” | With over 95,000 protocols and frequent updates new ECUs are added constantly. |
| “KESS3 is too difficult for beginners” | It features a user-friendly interface and comprehensive training is available. |
| “KESS3 can’t read locked ECUs” | Bench and Boot modes are specifically designed to allow access to locked ECUs. |
| “Subscription fees are too high” | The subscription ensures you receive regular updates and lowers long-term costs. |
| “KESS3 doesn’t allow DTC removal or map editing” | KESS3 is for reading and writing files. It integrates with editing software like ECM Titanium for map modifications. |
| “KESS3 doesn’t support gearbox tuning” | Extensive TCU tuning is supported including ZF DSG and Mercedes transmissions. |
| “KESS3 lacks safety features” | It includes crucial safety functions like checksum correction recovery mode and safe writing. |
Alientech KESS3 vs KESS V2: Frequently Asked Questions
What is the main difference between KESS V2 and KESS3?
The biggest difference is that KESS3 combines OBD, Bench and Boot tuning into one tool, replacing both the KESS V2 and K-TAG. It also has a much faster processor and uses the new user-friendly Alientech Suite software.
Can I trade in my KESS V2 for a KESS3?
Yes, there are often trade-in promotions available for owners of genuine Alientech KESS V2 and K-TAG tools. These offers can provide significant discounts on the protocols for a new KESS3 device, making the upgrade more affordable.
Do I need a K-TAG if I have a KESS3?
No. The KESS3 is an all-in-one tool that includes all the Bench and Boot tuning functions previously handled by the K-TAG. You no longer need a separate device for direct ECU work.
Does KESS3 support gearbox (TCU) tuning?
Yes, the KESS3 has extensive capabilities for TCU remapping, allowing you to tune a wide variety of automatic and dual-clutch transmissions.
Is KESS3 suitable for beginners?
Yes, the new Alientech Suite software is very user-friendly and easy to navigate. The tool guides you through the process, making it suitable for those new to tuning. Furthermore, comprehensive training and support are available to help you get the most out of your tool.
Is KESS3 a good tool for someone starting out?
The KESS3 is an excellent tool for learners, specifically the Slave version. Starting with a genuine Slave tool is the safest and most effective way to enter the tuning industry. It allows you to perform the read and write operations on the vehicle while relying on an experienced Master for the professionally modified tuning file. This setup provides a safety net, giving you access to expert support while you build your skills.
What Professional Tuners Say About the KESS3
Here is what professional tuners who have made the upgrade are saying about their experience: [have you got any specific kessv3 reviews we can add here?]
Who is the KESS3 NOT for?
If you are a hobbyist on a tight budget who only works on older cars then the right decision for you may be to continue using the Alientech KESS v2.
Conclusion: Is the KESS3 Upgrade Worth It?
When considering the Alientech KESS3 vs Alientech KESS V2, the benefits of upgrading are clear. The KESS3 is faster, more powerful and significantly more versatile than its predecessor. By combining OBD, Bench and Boot tuning into a single unit, it streamlines your workflow and expands your capabilities. With its modern software and flexible protocol activation, the KESS3 is not just a new tool but a future-proof platform for any professional tuning business. Alientech has confirmed that support and updates for the older KESS V2 and K-TAG will eventually end, making an upgrade to KESS3 essential for staying current with new vehicles and ECUs.
A Warning on Clone Tools vs Genuine Alientech Tools
When searching for tuning tools, you will undoubtedly encounter cheap “clone” versions of the KESS V2. While the low price is tempting, using a non-genuine tool is incredibly risky. These unauthorised copies often use stolen software and poor-quality hardware, leading to a high risk of failure. A failed write with a clone tool can permanently damage a vehicle’s ECU, resulting in a repair bill that is many times the cost of a genuine KESS3.
Crucially, clone tools come with zero technical support, no warranty and no updates. When something goes wrong, you are completely on your own. Investing in a genuine Alientech KESS3 is an investment in reliability, safety and professional support for your business.
About the Author: Simon White
Simon White is a master tuning file writer and qualified automotive engineer. As an IMI (Institute of the Motor Industry) approved lead trainer for the VIEZU Technical Academy, he has trained hundreds of professional tuners from around the globe. Simon’s deep, hands-on expertise with the full range of Alientech tools makes him a leading authority on their practical application.
Why Buy Your ECU Remapping Tools from Alientech Tuning?
At Alientech Tuning, we are your one-stop shop for professional tuning equipment. We provide 100% genuine Alientech tools and offer a service that goes beyond just the sale. Our dedicated technical support team is on hand to assist with installation, setup and any questions you may have. Crucially, if you encounter a problem with a vehicle or a protocol, our expert support is here to guide you through it.
We offer free online demonstrations so you can see the tools in action before you buy. Whether you are looking for a Master tool or a Slave tool, we have the right solution for you. We also provide professional online tuning training courses on how to use Alientech KESS3 vs KESS V2 so that you can learn to write your own tuning files. With fast worldwide shipping and tax-free sales for international customers, we make it easy to get the best tools for your business.