Unpacking ACES Fuel Injection: A UK Guide

For many classic car enthusiasts and restorers across the UK, the dream of modern reliability and efficiency often leads to exploring Electronic Fuel Injection (EFI) conversions. Amidst a growing market, new players consistently emerge, promising cutting-edge solutions. One such brand that has garnered significant attention, particularly through its online presence, is ACES Fuel Injection. But what exactly does ACES bring to the table, and is it the right choice for your cherished project?

ACES Fuel Injection positions itself as a pioneering force in the automotive aftermarket, dedicated to crafting advanced engine management systems and ignition components. Built on a robust foundation of electromechanical engineering, the brand prides itself on a team keenly attuned to the latest technological advancements. Their core mission revolves around delivering efficient, top-notch solutions to the global automotive community, aiming to lead the engine management technology landscape. This commitment to innovation and quality is designed to appeal to both the seasoned professional and the enthusiastic DIY mechanic.

The ACES Philosophy: Innovation and Design

At the heart of ACES Fuel Injection's product development is a strong emphasis on innovation. Their electromechanical engineering background isn't just a marketing claim; it underpins their approach to designing components that are not only effective but also forward-thinking. This dedication is evident in their comprehensive product range, which aims to provide complete solutions for modernising a vehicle's fuel delivery and ignition systems.

A standout design choice, and one frequently highlighted by users, is the strategic placement of the Engine Control Unit (ECU). Unlike some competitors who integrate the ECU directly into the throttle body, ACES opts for an external mounting solution, typically within the passenger compartment. This design choice is critical for heat management. Electronic components, especially sensitive ECUs, are highly susceptible to performance degradation and failure when exposed to excessive heat. By locating the ECU away from the engine bay's intense temperatures, ACES aims to enhance the system's longevity and reliability, a significant advantage for long-term vehicle operation.

The 'Kill Shot' System: A Closer Look

Among ACES Fuel Injection's offerings, the 'Kill Shot' TBI (Throttle Body Injection) system is a prominent product. User experiences suggest that this system, when fully operational, can deliver impressive results. For instance, one user reported their '70 Malibu, equipped with a 'Kill Shot' master kit, started instantly with a mere touch of the key after an engine rebuild. The system performed flawlessly during the critical engine break-in period, maintaining consistent performance.

The 'Kill Shot' master kit often includes a 7-inch monitor, which provides invaluable real-time data. For vehicles lacking modern instrumentation, such as classic cars with only 'idiot lights', this monitor becomes an essential tool. It allows users to track vital parameters like engine temperature, monitor the system's transition into closed-loop operation, and observe runtime, providing a detailed insight into the engine's behaviour and the EFI system's learning process. This level of monitoring is crucial for fine-tuning and ensuring optimal performance, especially during the initial learning phase of the ECU.

Installation and Initial Setup

One of the appealing aspects of ACES Fuel Injection systems, as reported by users, is their relative ease of installation. Despite the complexity typically associated with converting to EFI, the process can be surprisingly straightforward, even for individuals with limited mobility. However, it's worth noting that, like with any kit, occasional discrepancies can arise. One user encountered a situation where all the necessary parts for the O2 sensor installation were not included in their 'Kill Shot' kit, necessitating a separate acquisition. While this can be a minor inconvenience, it's a reminder to thoroughly check the kit contents against the installation manual before beginning work.

Furthermore, the installation of certain components, such as spark plug wires, might require customisation. ACES's plug wires, notable for their impressive carbon wire construction, often need to be cut to the correct length. For this task, a dedicated plug wire tool, such as those available from brands like NAPA, can significantly simplify the strip and crimping process, making it a worthwhile investment for DIY enthusiasts.

Performance Nuances and Troubleshooting

While the initial startup and break-in experiences with ACES systems are often positive, some users have encountered challenges during the tuning and learning phase. A recurring issue reported is the system running very rich and failing to enter closed-loop operation. This indicates an overly rich fuel mixture and a lack of proper feedback control from the O2 sensor to the ECU. Addressing such issues typically requires careful diagnosis, potentially involving adjustments to fuel pressure, verification of sensor readings, or ensuring all components are correctly installed and functioning.

Another critical incident reported involved an ignition coil failure, leading to a complete loss of spark. While individual component failures can occur with any system, this highlights the importance of readily available replacement parts and responsive technical customer support. The user's experience with slow customer support responses in this instance underscores a potential area for improvement for ACES Fuel Injection.

A unique incident involved the 7-inch monitor's magnetic power cord. If it inadvertently comes into contact with a metal surface, it can ground out the system, potentially blowing fuses and disrupting fuel pump operation. While easily remedied by disconnecting the faulty lead, this serves as a cautionary tale for handling components during installation or transit, emphasising the need for careful cable management.

Compatibility and Component Considerations

When considering an ACES Fuel Injection system, prospective buyers should be aware of specific component compatibilities. The ECUs, for instance, are not designed to run low impedance injectors. This is a crucial piece of information for anyone planning to use specific injector types or upgrading their fuel system, as it dictates the range of compatible injectors. Furthermore, ACES wiring harnesses utilise EV6 style connectors rather than the more common EV1. While not a deal-breaker, this distinction means users need to ensure their injectors, or any aftermarket components, are compatible with the EV6 standard, or be prepared to use adapters.

Why Choose ACES Fuel Injection?

• External ECU Design: The primary advantage is the ECU's placement outside the engine bay. This significantly reduces exposure to extreme heat, potentially extending the unit's lifespan and improving overall reliability compared to systems with integrated ECUs. This thoughtful heat management is a major selling point.
• Ease of Installation: Despite being a comprehensive EFI conversion, many users report the system is relatively straightforward to install, making it accessible for competent DIY mechanics.
• Comprehensive Kits: The 'master kits' often include a valuable 7-inch monitor, providing essential real-time data for monitoring and tuning, especially beneficial for classic cars.
• Quality Components: Aspects like the carbon wire plug leads demonstrate attention to detail in component quality.
• Initial Performance: Reports of instant starts and smooth engine break-in indicate strong initial performance when the system is correctly installed and configured.

Considerations Before You Buy

• Customer Support Responsiveness: Some users have experienced slow response times from customer support, which can be frustrating when troubleshooting critical issues.
• Component Compatibility: Be aware of the ECU's inability to run low impedance injectors and the use of EV6 connectors. Ensure your existing or planned components align with these specifications.
• Potential for Missing Parts: While not universal, isolated incidents of missing minor components (e.g., O2 sensor parts) have been reported, necessitating a thorough check of the kit contents upon arrival.
• Learning Curve for Tuning: Like any aftermarket EFI system, there can be a learning curve involved in achieving optimal tuning, especially if initial running issues like richness occur.

Frequently Asked Questions (FAQs)

Is ACES Fuel Injection a good system for a classic car?
ACES Fuel Injection systems show significant promise, offering advanced features and an advantageous external ECU design for improved reliability. User experiences are mixed, highlighting ease of installation ease and good initial performance, but also occasional issues with missing parts, customer support responsiveness, and initial tuning challenges. It can be a good system, but requires patience and attention to detail.

Who makes ACES Fuel Injection?
ACES Fuel Injection is a brand that manufactures its own line of performance engine management systems and ignition components. It is not a re-branded product from a larger, well-known manufacturer, but rather an independent entity focused on its own product development and innovation.

What are the common issues reported with ACES EFI systems?
Common issues reported include occasional missing minor parts in kits (e.g., for O2 sensor installation), slow customer support response times, initial running rich conditions that prevent closed-loop operation, and isolated component failures like ignition coils. There was also a specific incident with the monitor's magnetic power cable causing a system short.

Can ACES EFI ECUs use low impedance injectors?
No, ACES Fuel Injection ECUs are specifically designed not to run low impedance injectors. This is an important component compatibility factor to consider when planning your fuel system.

Where is the ACES EFI ECU typically installed?
A key design advantage of ACES EFI systems is that the ECU is designed to be installed inside the passenger compartment, away from the intense heat of the engine bay. This helps to protect the sensitive electronics and potentially prolong the life of the unit.

Is ACES EFI easy to install for a DIY enthusiast?
Generally, yes, ACES EFI systems are reported to be relatively easy to install for a DIY enthusiast, even for those with certain physical limitations. However, it's always advisable to thoroughly review the instructions, check for all included parts, and be prepared for minor adjustments or the need for specific tools like plug wire crimpers.

Conclusion

ACES Fuel Injection presents itself as a compelling option for those looking to upgrade their vehicle's fuel and ignition systems. Their commitment to innovation, particularly with the external ECU design, addresses a significant concern for electronic longevity in hot engine environments. While the systems generally offer ease of installation and strong initial performance, potential buyers should be mindful of the reported challenges, such as customer support responsiveness and specific component compatibilities. For the informed enthusiast willing to navigate these nuances, ACES Fuel Injection could indeed be a valuable addition to their automotive project, bringing modern efficiency and reliability to classic motoring.

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