High impedance injectors on a low impedance harness. Our injector drivers are designed to be plug and play with ecmlink for dsms. Lower impedence dictates a higher current flow is required to properly actuate openclose the injector. 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. An lm324 opamp or any other having a commonmode input which includes ground is used as a combined levelshifter and lowimpedance driver. I show you the solution to low impedance injectors. The high impedance ev14s are not bad, but the low impedance version of them would be even better.
You generally have to use an injector with an impedance matching your driver circuit. Highimpedance injectors typically range from 12 to 16 ohms of impedance, while lowimpedance injectors usually. I didnt really expect to see any problems but if any did exists it would be. I wanted to make sure that they performed exactly as expected for both high and low 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. Here is an example of a low impedance injectors pulse voltage, current, and fuel flow. High impedance injectors above 7ohms no peak and hold boxes are needed. Aem low impedence injector driver with univeral plug and play harness. Fjo low impedance injector driver powered by rpmware. Peak and hold manual features current control driver for low impedance injectors 4.
I have a 06 base rsx 5 spd and im debating on if i should go full. Holley efi 16 injector setup 8 cylinder engines setup of 8. 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. Each channel supplies full battery voltage to a fuel injector. 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. Difference between low impedance fuel injector and high.
A current high enough to create a lot of heat and fry your ecu. I have a set of 160lb low impedance injectors that im looking to run on my mod motor with my ms33x. Splice it in, hook it up to switched 12volts and ground, and youre on your way to the races. Holley v5 build 110 fuel system injection type custom low. High impedance fuel injectors marren fuel injection. When selecting injection type custom, where do you define the injector impedance. A high impedance injector 14 ohms used in a 12 volt system would require an operating current of 0. All injector dynamics injectors are high impedance. The mapecu dual channel low impedance injector driver drives low. Its perfectly safe and my crx always ran just fine with a resistor box and high impedance injectors.
Why do i have a injector resistor pack box in my car. The hondata injector driver allows you to use high or low impedance injectors without a resistor box either as injectors slaved to the ecu injector output, or as staged injectors. The ph injector driver module is optimized for use with 4a peak and 1a hold low impedance fuel injectors. When tesing the injector at 12v and no pressure the injector opened quicker then it did at 14v and 45psi. Each box can control up to 4 injectors current control driver for low impedance injectors 4 channels available in three current versions. 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. Injector type select low impedance or high impedance, both sets must be. The injector you measured at 3 ohms is considered a low impedance injector.
A low impedance injector plus a resistor is pretty much equivalent to a high impedance injector. This may be too much for the injectors, especially if you only have one or two lowimpedance injectors per driver. Low impedance injector resistor pack honda how to youtube. Low impedance injectors open as fast as stockers, providing smooth idle and crisp throttle response, but your factory ecu cant run them. The fjo low impedance injector driver is built for the racing environment to withstand heat, vibration, dirt and water. There are two types of injectors, low 24ohms and high 1016ohms impedance. The peak supplies up to 4 amps to snap huge injectors open. If your car came with a low impedance injector and a resistor box, it will need to be bypassed.
If you run 12 volts thru them with that low of a resistance you will make a high amount of current. Add to cart 160 lb precision turbo ev1 low impedance. The temperature increase will depend on your driving. So now i will be building the box, i jst cant see paying 400. The flow during the time when the injector is half open is hard to predict. A zener diode d8 drops its supply voltage down from 28v too close to the opamp limit to a safer 18v.
Ph injector driver module injector drivers megasquirt ems. Lowimpedance fuel injectors usually sideways rally team. More amps equals more heat which our pcms drivers are not designed for. On a lowz injector current would be very high, which is.
Injectors that have too small a flow rating can starve the engine of fuel at full. Lm1949 injector drive controller check for samples. Low impedance injectors siemens deka 220 lb injector. Sort by price low to high price high to low product name brand latest arrivals popularity. Going with a holley efi setup and dont need this any longer. It should not really matter if the resistor is before the injector or after the injector. By adding a resistor box to a high impedance ecu really. Staged injection allows the use of primary and secondary injectors of different.
Technical information low and high impedance injectors hondata. This allows you to use a larger injector than normally possible without hurting idle and low speed driveability. After selecting fuel systeminjection type custom, i select configure injector sets and enter the following. The box was only mounted never run in the car and harness never even routed. This fine on a high impedance injector because the current flow is rather low. 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. Unless im mistaking i believe i either need to run resistors or an injector driver. Ms3 with low impedance injectors efi tuning questions. If that temperature remains high enough for long enough the driver transistor will be damaged. Another issue is that saturation drivers do not back off the voltage after.
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. More power means faster response for the same injector architecture. Driver for low impedance injectors toss me an email. All the resistor box does is bring up the total impedance of the circuit. An ecu that is designed for a high impedance injector works pretty much like a dumb switch. Description downloads 4 channel low impedance injectors driver unit. 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. 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. Lowimpedance fuel injectors generally have coils with a resistance of 26 ohms. So a lowimpedance 50 lbhr injector will almost certainly be snappier than a highimpedance 50 lbhr injector. This depends on the driver signal that your ecu delivers to the injector.
Aem low impedance injector driver ford mustang forums. The high end drivers are peak and hold mode people often incorrectly call a low impedance injector peak and hold and more common drivers are saturation mode. Difference between high and low impedance injectors. Bosch lowimpedance injector for all 4cyl and mk23 vr6 cylinder engines. D1 is included so that the lm1949 sees a simulated darlington.
This high current would burn out the injector if used for the entire. Low impedance injectors with a resistance of around 2. A zener not shown could also be used to supply 5v to the lm1949. Interesting that the install pdf says they are 65lb injectors but the replacement part number 522801 lists them as 80lb. 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. Lm1949 1features description the lm1949 linear integrated circuit serves as an 2 low voltage supply 3v 5. The versafueler provides separate peak and hold logic circuits for each injector.
This design uses the tried and tested national lm1949 injector drive controller chip. Impedance is the electrical resistance of the electromagnetic coil inside of a fuel injector. Q3 and q4 are a pushpull low impedance driver for the fet gate. Consider impedence to be another term for resistance just for this thread. Injectors can be classified in two categories, as either highimpedance or lowimpedance. Ohms law calculations i v r example of low impedance. The ph injector driver module compensates for low voltage conditions cold weather, startup, etc. 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.
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 injector opening time will change with fuel pressure to, as an example a friend set up a test rig on his desktop. Technical information low and high impedance injectors. Since 1986, marren fuel injection has been focused on developing products and services that improve the performance and overall experience for anything efi equipped. Staged injection allows the use of primary and secondary injectors of different sizes. You may prefer to use an oem injector resistor box instead of making you own setup. 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. Low or high impedence injectors mr2 owners club forum. Each injector driver box has 2 channels with 2 injector driver outputs on each channel. Using a 12 ohms impedance injector on a 3 ohms driver circuit will fail it to open because of too few power transferred, and vice versa it will make your driver circuit overload.