High impedance injectors typically range from 12 to 16 ohms of impedance, while low impedance injectors usually range from 0. High impedance injectors on a low impedance harness. Current control driver for low impedance injectors 4 channels available in three current versions 2a0. Sort by price low to high price high to low product name brand latest arrivals popularity. The drive circuitry for this type of injector is simple and sometimes referred to as a saturated driver circuit. Is the minimum of 8ohm impedance for each injector driver on a sprint 500 a firm limit or just a guide so people dont try and run low impedance injectors. Each injector driver box has 2 channels with 2 injector driver outputs on each channel. Low impedance approximate 5 ohmscan be used with high impedance ecu with the proper setup and 10. It is important to know which type your injectors are. Fuel injectors free delivery possible on eligible purchases. The wiring at the resistor box should have 1 more wire than the number of cylinders, 5 for a 4 cylinder, 7 for a 6 cylinder, etc. The ph injector driver module compensates for low voltage conditions cold weather, startup, etc. An injector used in a saturated driver system requires a high resistance value across its coil 1216 ohms.
Honda engine computers require a total injector impedance of about 10 ohms so a resistor pack is needed whenever the stock saturated injectors are swapped with peak and hold. Changing from high imp to low imp injectors engine. High impedance injectors on a low impedance ecu z31. Gsx0r is a pcprogrammable piggy back controller that allows users to. Ph injector driver module injector drivers megasquirt ems. Fjo low impedance injector driver powered by rpmware. Audio signal injector is a must to have little tool for troubleshooting audio circuits. How do i know if my injector is low impedance or high impedance. Connecting the audio signal injector to the circuit under test you should be able to hear its tone in the speaker of the audio device so that beginning at one end of the circuit you can walk your way around the circuit, following its schematic to find where the tone is lost. Why do i have a injector resistor pack box in my car. The mapecu dual channel low impedance injector driver drives low impedance fuel injectors from ecus designed to drive high impendence saturation injectors. When tesing the injector at 12v and no pressure the injector opened quicker then it did at 14v and 45psi. The ph injector driver module is optimized for use with 4a peak and 1a hold low impedance fuel injectors. Rx7 prior to 1991 run low impedence injectors so the factory came up with this device.
Fuel injectors are controlled by one of two possible injector control circuits called drivers. All injector dynamics injectors are high impedance. Splice it in, hook it up to switched 12volts and ground, and youre on your way to the races. Lowimpedance fuel injectors generally have coils with a resistance of 26 ohms. 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. If you run 12 volts thru them with that low of a resistance you will make a high amount of current. You can measure the resistance across the two electrical terminals of the injector. The real work is wiring the new injector uscar terminals on tedious, and installing the injectors if you have to remove the upper intake manifold. Fuel injector 160 lbhr ev1 minitimer low impedance this accel low impedance fuel injector has a flow rate of 160 lbhr and is ev1 minitimer style. If that temperature remains high enough for long enough the driver transistor will be damaged.
Drives high or lowimpedance injectors with use of peak and hold injector driver box see more. Changing from high imp to low imp injectors changing from high imp to low imp injectors. Fuel components fuel injectors injector drivers engine parts. Superior spray patterns and finest atomization make tuning easy. The acceleronics versafueler us patent 6836721 simply splices in between your current ecu and the big honkin injectors that your monster motor needs. Add the appropriate ballast resistor so that the system impedance is the same with the low impedance injector as your original injector. The most common, using a simple drive circuitry is sometimes referred to as a saturated driver circuit. A peak and hold injector driver is far more complex than simply. Ohms law calculations i v r example of low impedance. Lets say you measure a low impedance injector and find it has 2 ohms or. Bosch lowimpedance injector for all 4cyl and mk23 vr6 cylinder engines. Inside the anodized aluminum enclosure, all circuits are encapsulated to. Injectors can be classified in two categories, as either highimpedance or lowimpedance. Driver for low impedance injectors toss me an email.
Impedance is the electrical resistance of the electromagnetic coil inside of a fuel injector. More amps equals more heat which our pcms drivers are not designed for. High impedance injectors on a low impedance ecu 07082009, 05. Ms3 with low impedance injectors page 2 efi tuning. Above that, the low impedence type peak and hold were easier to control, especially at idle pulse width ie. A fuel injector is a electricalmechanical valve that uses magnetic field from its coil winding when current is applied and pulls the metal pintle back away from its seat to allow fuel to flow. Each box can control up to 4 injectors current control driver for low impedance injectors 4 channels available in three current versions 2a0,5a 4a1a 8a2a. Injectors can be classified in two categories, as either high impedance or low impedance.
Holley v5 build 110 fuel system injection type custom low impedance injectors. Apparently you can get a separate peakandhold injector driver box for these type of applications which would. By adding a resistor box to a high impedance ecu really. It is a simple 2 wire device the installs in line with the positive 12v connection to the injectors. Most large capacity injectors are available in peak and hold form about 2 ohms impedance, whereas most stock injectors from about 92 on are saturated 810 ohms impedance.
This may be too much for the injectors, especially if you only have one or two lowimpedance injectors per driver. Im not sure how low the impedance can be before damage. Each box can control up to 4 injectors current control driver for low impedance injectors 4 channels. An option would be to run a resistor pack from an rx7 or similar. Here is an example of a low impedance injectors pulse voltage, current, and fuel flow. Fueltech peakandhold injector drivers steve morris engines.
Low impedance approximate 5 ohmscan be used with highimpedance ecu with the proper setup and 10. Since so many of the performance injectors back then were low impedance injectors and they were actually. I recommend doing some research on the differences between saturated and peak and hold injectors and the differences advantages disadvantages of a resistor box versus a injector driver box. Current control driver for low impedance injectors 4 channels available in. High impedance injectors vs sprint 500 official haltech forums. If your car came with a low impedance injector and a resistor box, it will need to be bypassed. These have coil resistances 8 ohms or more and are the most common in use today.
Billet atomizer fuel injectors are low impedance 1. High impedance injectors above 7ohms no peak and hold boxes are needed. On a low z injector current would be very high, which is why they are considered peak and hold. Read on how to tell injectors apart, measure them and how to wire up a resistor box. That way if i ever need to go back to the low impedance injectors for whatever reason i can easily. So a lowimpedance 50 lbhr injector will almost certainly be snappier than a highimpedance 50 lbhr injector. You will only need this harness if you are building a custom wiring harness for your system. Auxiliary fuel injector and ignition driver this was a project that i did a long while back while working with a few folks on the efi332 project.
This means that low impedance injectors are no longer the peak of performance when considering fuel injectors. Billet atomizer fuel injectors are compatible with all fuels methanol, ethanol, nitro methane, race fuels a. The flow during the time when the injector is half open is hard to predict. Fueltech peakandhold injector drivers are available in a variety of configurations for your lowimpedance fuel injectors. A current high enough to create a lot of heat and fry your ecu. Im wanting to drive 3 pairs of high impedance injectors but they are only 12. Low impedance injectors can not be just used with our cars you need an injector driver box or computer that is designed to run them. If you are using an oem ecu even if it is flashed, you need to measure the impedance of the oem injectors and choose injectors that match the impedance category highz or lowz of the oem injectors. The mapecu3 and mapecu2 have up to three 3 high current outputs that can be configured to drive up to six 6 high impedance saturation auxiliary injectors.
All the resistor box does is bring up the total impedance of the circuit. On a lowz injector current would be very high, which is why they are considered peak and hold. Since so many of the performance injectors back then were. This allows you to use a larger injector than normally possible without hurting idle and low speed driveability. The temperature increase will depend on your driving. Mustknow information on both high impedance and low impedance honda fuel injectors. Fuel injector impedance and resistor box basics wrenchin. Drives high or lowimpedance injectors with use of peak and hold injector driver box. Highimpedance injectors typically range from 12 to 16 ohms of impedance, while lowimpedance injectors usually. This depends on the driver signal that your ecu delivers to the injector. The fjo low impedance injector driver is built for the racing environment to withstand heat, vibration, dirt and water. When the 50 lbhr highimpedance injectors on the acceleronics test car were replaced with 75 lbhr lowimpedance injectors, the ecu setting that adjusts for sluggishness had to be set back to stock.
Holley v5 build 110 fuel system injection type custom low. So now i will be building the box, i jst cant see paying 400. This fine on a high impedance injector because the current flow is rather low. Stock ecu uses a saturated injector firing scheme which just provides a ground path for the injector for the entire duration of the pulse width. The versafueler provides separate peak and hold logic circuits for each injector. Nov 03, 2003 the dc resistance of the high impedance injector and the combination of a low impedance injector plus the resistor is about the same so the current the ecu saturation driver has to sink is the same but the voltage rise time on the low impedance injector is faster. I made a few prototype parts for the project, this was one that was useful and something that could be. Staged injection allows the use of primary and secondary injectors of different sizes. Back to tech corner injector compatibility with ecus. Technical information low and high impedance injectors.
I made a few prototype parts for the project, this was one that was useful and something that could be used as a primary or auxiliary injector driver. By adding a resistor box to a high impedance ecu really make. 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. The dc resistance of the high impedance injector and the combination of a low impedance injector plus the resistor is about the same so the current the ecu saturation driver has to sink is the same but the voltage rise time on the low impedance injector is faster. The board has its own 5v power supply, which means it is powered by 12v, and is designed to be installed in its own case. Usrt offers the worlds most complete and bestresearched line of injectors for vwaudi cars. The injector opening time will change with fuel pressure to, as an example a friend set up a test rig on his desktop. Low impedance injector designs are mostly used in high flow. An injector operating on a saturated circuit driver high impedence typically has a reaction time of 2 milliseconds, while a peak and hold driver typically responds in 1.
Difference between high and low impedance injectors. High impedance injectors on a low impedance ecu z31 performance. You need bigger injectors, but big high impedance injectors are sluggish. A peakandhold driver circuit utilizes fuel injectors with low resistance coils 22. Bosch 1600 cc 160lbhr fuel injector ev1 0280150842 ford.
The acceleronics versafueler is designed to provide years of troublefree service. He said if the driver in the brain box can source current to flow enough to handle the low impedance injectors, it can certainly handle the opening and holding on the high imp. And i am thinking about stepping up to some 72s which are low impedance because of the lag the high impedance can have on the injector. This allows this unit to drive up to an additional 4 low or 8 high impedance injectors and can be used with any of the haltech ecu engine management systems. Fueltech peakandhold injector drivers are available in a variety of configurations for your low impedance fuel injectors. Apr 01, 2008 mustknow information on both high impedance and low impedance honda fuel injectors. Low impedance injectors open as fast as stockers, providing smooth idle and crisp throttle. A spring returns the pintle to the closed position when no electrical current is flowing. High impedance injectors vs sprint 500 official haltech. Apply heat sink compound on the back of the metal tab on all five to220. Used hondaacura resistor box designed to run low impedance 23 ohm injectors. Running low impedance injectors without a resistor box will substantially increase the temperature of the transistor driver ic due to the increase in current flow. So according to jasons site a low impedance ecu like a 84t ecu should be able to.