Bosch Injectors
Fuel Injector Overview
A fuel injector is an
electronically operated solenoid that opens and closes to deliver precise
amounts of fuel to the engine for each combustion cycle.
Modifying an engine to
produce more power typically involves increasing the volume of air it can burn
along with fuel. This increased air volume means the engine will also require
more fuel to maintain a specific range of air-to-fuel ratio for safe operation.
If you have a programmable ECU, you can increase fuel delivery by adjusting the
fuel map, which in turn increases the injector’s operating duty cycle. Ideally,
injectors should operate at around 80% duty cycle or lower when the engine is
producing peak power. If they exceed this, upgrading to larger injectors may be
necessary.
When selecting injectors, it’s also important to consider the type
of fuel being used. Certain fuels, such as E85, require injectors that are
approximately 40% larger to deliver the necessary amount of fuel. Proper
injector sizing ensures the engine operates optimally and safely when modified
to produce more power.
Available Kits
Injector Flow Matching
Injector flow matching is the process of measuring and grouping fuel injectors based on their exact fuel flow rates to ensure that each injector in the matched set delivers identical amounts of fuel throughout engine operation, maintaining consistent air-fuel ratios across all cylinders. Once flow matching is completed, each injector is marked with a colored dot on the injector body. Injector groups are assigned colors blue, red, or yellow.
- Flow matching helps achieve uniform fuel delivery across all cylinders.
- Ensures a consistent air-to-fuel ratio for optimal engine performance.
- Allows for more precise tuning with using Haltech’s Nexus Software Programmer.
- Promotes balanced power output throughout the
rev range.
NSP Injector Setup
Haltech Nexus Software Programmer (NSP) is the
software used for tuning and programming Haltech Elite and Nexus ECUs. To configure your map with the correct injector settings for
Bosch injectors:
1. Go to the Navigation Tree on the left side of the software, expand the Fuel Tuning node, and then click Stage 1.
2. Click the “Select Stage 1 Injectors” button in the main window.
3. Choose the appropriate Bosch injector from the list, then
click OK.
Following the steps above will update the "Injector Dead Time" and "Injector Flow Rate" tables in your map based on the selected injector. If you wish to view or modify these tables, the NSP software provides the option to show these settings.
Injector Data
Fuel Injector Adapters
Haltech also offers fuel injector adapters designed to provide flexibility when installing aftermarket injectors across a range of engine configurations. These adapters facilitate compatibility between injectors and aftermarket fuel rails with varying bore diameters and heights. By accommodating differences in injector body dimensions and mounting requirements, they help ensure a secure and leak-free installation.
Injector Wiring Information
Wiring a fuel injector involves properly connecting it to
the engine’s electrical and fuel management system. The injectors must be
correctly wired to an injector output and a 12V switched power supply.
• Wire stripper
1.) Cut the injector output and injector power supply wires to the required length, then insert them through the rubber boot.
2.) Strip the wires, then crimp the pins onto each wire—starting with the conductor crimp, followed by the insulation crimp.
3.) Slide the crimped wires into the connector.
4.) Slide the rubber boot onto the connector to protect the
pins and provide strain relief.
Related Articles
Injector Dead Time
An attempt at explaining injector dead time in a different way, while trying to make it easier to understand what is going on. What Is Injector Dead Time? Injector dead time is exactly what it says. It is the amount of time between the point where ...Dead Time
(example only) Fuel Injector Dead Time is the mechanical delay from when the injector solenoid coil is energised to when the injector stars flowing fuel. It is also known as 'injector lag time' or 'injector latency'. Dead Time is unique for every ...Flow
This table sets the flow rate of the fuel injectors fitted to each injector output in the injection stage. If multiple injectors are fitted per injector output, this is the combined flow rate of all injectors per output. This data is usually supplied ...Fuel Injectors
All Injectors share a common +12V supply voltage. The ECU injector output completes the circuit to ground when fuel delivery is required. When using the Haltech long flying lead harness this is already pre-terminated, injector power is supplied via a ...Fuel Return Flow Sensor
A Fuel Return Flow sensor is used to monitor the amount of fuel flow returning to the tank. It is most commonly combined with a Fuel Flow sensor to exactly calculate the fuel being consumed by the engine by measuring the fuel flow before and after ...