Staged injection allows the use of primary and secondary injectors of different sizes. The primary injectors are always used, and may be stock or other injectors with a rapid opening time and good spray pattern., The secondary injectors activate based on driving conditions, and may be larger than the primary injectors. The injector sizes and dead times for each set of injectors do not need to be the same. eg stock 310cc injectors can be used until boost, at which point both 310cc and 1300cc injectors are used.
It also is possible to use two independent fuel systems for each set of injectors. eg the secondary injectors may use E85 or race gas.
Staged injection requires ECU outputs. Currently this is only supported by the s300 & KPro as almost all FlashPro ECUs do not have accessible outputs.
| Restriction | |
| Sales Region | Unrestricted |
- Four channel injector driver with activation input.
- Drives both peak and hold (low impedance) and saturated (high impedance) injectors.
- Injector current control to ensure both rapid injector operation and low injector temperature.
- Replaces unreliable resistor boxes
- Housing sealed to IP65 (water resistant)
- Activation input allows easy injector staging.
The Hondata injector driver allows either the use of high or low impedance injectors without a resistor box either as injectors slaved to the ECU injector output or as staged injectors.
Features:
| • | Four channel injector driver with activation input. |
| • | Drives both peak and hold (low impedance) and saturated (high impedance) injectors. |
| • | Injector current control to ensure both rapid injector operation and low injector temperature. |
| • | Replaces unreliable resistor boxes |
| • | Housing sealed to IP65 (water resistant) |
| • | Activation input allows easy injector staging. |
Installation
Staged injectors allow the use of primary and secondary injectors of different sizes. The primary injectors are always used, and may be stock or other injectors with a rapid opening time and good spray pattern. The secondary injectors activate based on driving conditions, and may be larger than the primary injectors. The injector sizes and dead times for each set of injectors does not need to be the same. eg stock 310cc injectors can be used until boost, at which point both 310cc and 1300cc injectors are used.
It also is possible to use two independent fuel systems for each injector.
Voltage and Current Waveforms The following are sample voltage and current measurements from injectors used to illustrate the difference between high and low impedance injectors and the stock ECU vs Hondata Injector Driver.
In each example voltage is green, current is yellow, horizontal scale is 1ms per division.
 Stock ECU, high impedance injectors
Stock high impedance injector driven by the ECU. The current rises slower than the voltage because of the inductance of the injector, reaching a peak of 1 Amp. When the injector is de-energized, the induction of the injector creates a reverse voltage spike. Note that you can make out the slight change in current when the injector has opened, around 1.2ms.
 Injector Driver, high impedance injectors
Stock high impedance injector driven by the Hondata Injector Driver. Almost the same as the ECU waveform, except the back voltage clamping is a little better.
 Stock ECU, low impedance injectors
Low impedance injector driven by the ECU. The current scale has changed, so the peak current is 4 Amps. This current will eventually overheat both the injector and ECU output.
 Injector Driver, low impedance injectors
Low impedance injector driven by the Hondata Injector Driver. The injector current rises to 4 Amps to open the injector quickly, then is reduced to 1 Amp to hold the injector open. Because the injector current is reduced twice the voltage has two backwards spikes rather than one. |
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