Regan Brown
The Mazda RX7 is a popular car for enthusiasts and owners alike, with many seeking to modify and improve their vehicles. One common area of interest is the fuel injectors, with owners seeking to replace or upgrade stock injectors to improve performance and efficiency. The stock fuel injectors for the Mazda RX7 are 460 cc/min units, and while some seek to increase the size of these injectors for greater fuel flow, others suggest that this may not be beneficial for non-turbo models. When it comes to choosing new injectors, it is important to consider the engine specifications and goals, as well as seeking advice from professionals and other enthusiasts.
| Characteristics | Values |
|---|---|
| Stock size fuel injectors | 460 cc/min units |
| Shape of the clip | Oval |
| Impedance | Low |
| Connector type | Rounded connector socket |
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What You'll Learn
- Stock size fuel injectors for upper and lower sections of the FC NA Vert are 460 cc/min units
- S5 injectors are low-impedance, while S4 injectors are high-impedance
- S4 injectors have a square clip, while S5 injectors have an oval-shaped clip
- S4 injectors have primitive clip-style connectors that can crumble with age
- RX7 fuel injectors are EV1, while RX8 fuel injectors are Denso connectors
Stock size fuel injectors for upper and lower sections of the FC NA Vert are 460 cc/min units
The stock size fuel injectors for the upper and lower sections of the FC NA Vert are 460 cc/min units. These injectors are known to be difficult to find, as they are not readily available as new parts. However, they can be sourced second-hand or from specialist suppliers.
The 460 cc/min fuel injectors are specific to the Mazda RX7, and more specifically, the 1986-1987 models. These injectors are also identified by their red tops and high impedance. It is important to note that the shape of the injector clips can vary, with oval-shaped clips indicating S5 injectors and square-shaped clips indicating S4 injectors.
When considering replacement injectors, it is recommended to consult with specialists and consider the specific engine configuration and goals. It is also important to ensure compatibility with the fuel system and ECU to avoid any issues.
Additionally, there are rebuild kits available for the RX7 injectors, which can be useful for those looking to refurbish or maintain their existing injectors. These kits typically include various components required for injector maintenance.
It is worth noting that while the stock injectors can support an additional 75 HP without an upgrade, increasing the fuel flow on a non-turbo FC is generally not advised. Most people achieve more power by turning down the amount of fuel injected using an aftermarket ECU or AFC.
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S5 injectors are low-impedance, while S4 injectors are high-impedance
The impedance of a fuel injector relates to the electric current used, i.e. the amperage and resistance used by the injector to deliver fuel to the combustion chambers. S5 injectors are low-impedance, while S4 injectors are high-impedance. This means that S5 injectors receive a more powerful electrical signal with a lower impedance of 2.3 to 4.5 ohms. On the other hand, high-impedance S4 injectors use a low-amp current with an impedance of 10.9 to 16.8 ohms.
Low-impedance injectors have a faster response time and are better for high-performance applications where a large amount of fuel is needed. They have a resistance of 2-4 ohms throughout the injector coil. This type of injector runs hotter, and while they were more common in the 1980s and 1990s, they are now mostly used in some aftermarket and race engines.
High-impedance injectors are more common in modern cars and are the standard for OEM engines. They are also called saturated injectors and are a highly cost-effective solution. The drive circuitry of high-impedance injectors is straightforward and utilizes a saturated driver circuit. They have a coil resistance from 8-16 ohms and use a lower current to keep the injector cooler, making them more reliable and improving longevity.
It is important to use the correct type of fuel injector as using the wrong kind will lead to performance issues and could cause problems with your vehicle's ECU and other engine management electronics.
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S4 injectors have a square clip, while S5 injectors have an oval-shaped clip
When it comes to the fuel injectors of the Mazda RX7, specifically the NA S5 variant, it is essential to distinguish between the S4 and S5 injector types. The key difference lies in the shape of their clips: S4 injectors have a square clip, while S5 injectors have an oval-shaped clip. This distinction is important when identifying the correct injectors for your vehicle.
The injectors in the Mazda RX7 play a crucial role in delivering fuel to the engine, and ensuring the engine receives the correct amount of fuel is vital for optimal performance and fuel efficiency. Over time, fuel injectors may become clogged or damaged, necessitating replacement to maintain engine performance.
As you delve into the specifics of the S4 and S5 injectors, you'll find that the S4 injectors are characterised by their square-shaped clips. These injectors are typically found in older models and are known for their primitive clip-style connector design. With age, these connectors tend to crumble and become brittle, leading to potential performance issues.
On the other hand, the S5 injectors feature an oval-shaped clip, marking a departure from the square design of their predecessors. This change in shape is not just a matter of aesthetics; it signifies an evolution in design and technology. The oval clip in the S5 injectors indicates that they are likely to be more modern and may offer improved performance and reliability over the older S4 injectors.
It is worth noting that the impedance of fuel injectors can also vary between the S4 and S5 models. The S5 injectors are known to have low impedance, while the S4 injectors may have either low or high impedance. This difference in impedance can impact the electrical resistance within the injectors and, consequently, the flow of fuel into the engine.
In conclusion, when discussing the stock NA S5 RX7 fuel injectors, it is crucial to recognise the distinction between the S4 and S5 injector types. The shape of their clips, either square for S4 or oval for S5, serves as a visual identifier. Beyond aesthetics, these differences can impact performance, reliability, and the overall driving experience of the Mazda RX7.
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S4 injectors have primitive clip-style connectors that can crumble with age
The stock NA S5 RX7 fuel injectors are the yellow RX 8 Secondaries, which are about 460cc in size, reasonably priced, and readily available. The S5 injectors have an oval-shaped clip, while the S4 injectors have square-shaped clips.
The S4 fuel injectors require specific tools for effective maintenance and replacement. The VAG junior power terminal removal tool is one such example, which is designed to simplify the process of removing and replacing the fuel injector connectors. This tool is inserted from the connector side to slowly pull the wires out. It is important to invest in high-quality tools, as cheap alternatives may not work effectively.
Additionally, the S4 fuel rail requires injector spacers. The specific spacer size depends on the injector size. For instance, 2 1/2" (64mm) injectors require 12mm (7/16") rail spacers, while 1 1/2" (37mm) injectors need 15mm (9/16") injector spacers.
In conclusion, while the stock NA S5 RX7 fuel injectors are readily available, the S4 injectors present challenges due to their primitive clip-style connectors that are prone to crumbling with age. This issue has been widely recognized, and specialized tools and techniques are available to address it.
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RX7 fuel injectors are EV1, while RX8 fuel injectors are Denso connectors
The Mazda RX7 is a popular car for enthusiasts and owners alike. When it comes to fuel injectors, it is important to know the specifics of your car's engine and your goals for it. The stock S5 NA RX7 fuel injectors are low impedance injectors with an oval-shaped clip. However, it is worth noting that finding new stock injectors can be quite difficult as they are not readily available.
There are various options for replacement injectors, and it is important to ensure compatibility with your vehicle. One key difference to note is that RX7 fuel injectors are EV1, while RX8 fuel injectors are Denso connectors. The Denso fuel injectors for the RX8 are yellow in colour and are rated at 3.1 bar fuel pressure. They are available from various suppliers, including Denso and Mazda.
When choosing new injectors for your RX7, it is recommended to seek advice from specialists and consider factors such as the engine specifications and your desired performance goals. The Adaptronic representative, for example, suggested adding a wideband O2 sensor, exhaust gas temperature sensors, and a fuel pressure sensor, in addition to recommending yellow RX8 secondary injectors of about 460cc's capacity.
It is also important to maintain your RX7 fuel injectors properly. They should be cleaned about every 3 years or every 30,000 to 60,000 miles, depending on factors such as driving habits, fuel quality, and vehicle type. Signs that your fuel injectors may need attention include reduced fuel efficiency, rough idling, engine misfires, loss of power, and sluggish acceleration. Regular maintenance can help prevent further damage, poor fuel economy, and increased emissions.
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Frequently asked questions
Stock NA S5 RX7 fuel injectors are low-impedance injectors with an oval-shaped clip.
The main difference between S4 and S5 injectors is the connector type. S4 injectors have a square-shaped clip, while S5 injectors have an oval-shaped one. S4 injectors are also known to use primitive clip-style connectors that can crumble over time.
The stock size fuel injectors for both the upper and lower parts of the FC NA Vert are 460 cc/min units.
Increasing the size of the injectors for more fuel flow is not recommended for a non-turbo FC as it already runs rich from the factory. Instead, most people make more power by turning down the amount injected using an AFC or aftermarket ECU.
The US Adaptronic rep recommends yellow RX 8 secondary injectors, which are about 460cc's, reasonably priced, and readily available.
