If that temperature remains high enough for long enough the driver transistor will be damaged. So a lowimpedance 50 lbhr injector will almost certainly be snappier than a highimpedance 50 lbhr injector. You generally have to use an injector with an impedance matching your driver circuit. 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. When selecting injection type custom, where do you define the injector impedance. Lowimpedance fuel injectors usually sideways rally team. This fine on a high impedance injector because the current flow is rather low. Here is an example of a low impedance injectors pulse voltage, current, and fuel flow. I show you the solution to low impedance injectors. The temperature increase will depend on your driving. Aem low impedence injector driver with univeral plug and play harness. The box was only mounted never run in the car and harness never even routed.
Staged injection allows the use of primary and secondary injectors of different sizes. 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. I have a 06 base rsx 5 spd and im debating on if i should go full. 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. The versafueler provides separate peak and hold logic circuits for each injector.
Lowimpedance fuel injectors generally have coils with a resistance of 26 ohms. D1 is included so that the lm1949 sees a simulated darlington. 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. An lm324 opamp or any other having a commonmode input which includes ground is used as a combined levelshifter and lowimpedance driver. Difference between low impedance fuel injector and high. 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.
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. You may prefer to use an oem injector resistor box instead of making you own setup. I didnt really expect to see any problems but if any did exists it would be. 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. Add to cart 160 lb precision turbo ev1 low impedance. A zener not shown could also be used to supply 5v to the lm1949. The injector opening time will change with fuel pressure to, as an example a friend set up a test rig on his desktop. This may be too much for the injectors, especially if you only have one or two lowimpedance injectors per driver. 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. Driver for low impedance injectors toss me an email. Ph injector driver module injector drivers megasquirt ems.
Each injector driver box has 2 channels with 2 injector driver outputs on each channel. Fjo low impedance injector driver powered by rpmware. The high impedance ev14s are not bad, but the low impedance version of them would be even better. Low impedance injectors with a resistance of around 2. This design uses the tried and tested national lm1949 injector drive controller chip.
If it means anything, i would like to keep everything sequential. Another issue is that saturation drivers do not back off the voltage after. A current high enough to create a lot of heat and fry your ecu. 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. Lm1949 injector drive controller check for samples.
The acceleronics versafueler us patent 6836721 simply splices in between your current ecu and the big honkin injectors that your monster motor needs. This depends on the driver signal that your ecu delivers to the injector. The ph injector driver module is optimized for use with 4a peak and 1a hold low impedance fuel injectors. 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. Ms3 with low impedance injectors efi tuning questions. This high current would burn out the injector if used for the entire. Going with a holley efi setup and dont need this any longer. 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. Holley efi 16 injector setup 8 cylinder engines setup of 8. Splice it in, hook it up to switched 12volts and ground, and youre on your way to the races. The peak supplies up to 4 amps to snap huge injectors open. When tesing the injector at 12v and no pressure the injector opened quicker then it did at 14v and 45psi.
Interesting that the install pdf says they are 65lb injectors but the replacement part number 522801 lists them as 80lb. The mapecu dual channel low impedance injector driver drives low. Why do i have a injector resistor pack box in my car. High impedance fuel injectors marren fuel injection. 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 real work is wiring the new injector uscar terminals on tedious, and installing the injectors if you have to remove the upper intake manifold. Ohms law calculations i v r example of low impedance. I have a set of 160lb low impedance injectors that im looking to run on my mod motor with my ms33x. Difference between high and low impedance injectors. Lower impedence dictates a higher current flow is required to properly actuate openclose the injector. Injectors that have too small a flow rating can starve the engine of fuel at full. I wanted to make sure that they performed exactly as expected for both high and low impedance injectors. Consider impedence to be another term for resistance just for this thread. 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.
Since 1986, marren fuel injection has been focused on developing products and services that improve the performance and overall experience for anything efi equipped. An ecu that is designed for a high impedance injector works pretty much like a dumb switch. A low impedance injector plus a resistor is pretty much equivalent to a high impedance injector. It should not really matter if the resistor is before the injector or after the injector. There are two types of injectors, low 24ohms and high 1016ohms impedance. Staged injection allows the use of primary and secondary injectors of different. Fueltech peakandhold injector drivers steve morris engines. Highimpedance injectors typically range from 12 to 16 ohms of impedance, while lowimpedance injectors usually. Unless im mistaking i believe i either need to run resistors or an injector driver.
Sort by price low to high price high to low product name brand latest arrivals popularity. Injectors can be classified in two categories, as either highimpedance or lowimpedance. High impedance injectors above 7ohms no peak and hold boxes are needed. Peak and hold manual features current control driver for low impedance injectors 4. This allows you to use a larger injector than normally possible without hurting idle and low speed driveability. Our injector drivers are designed to be plug and play with ecmlink for dsms. Low or high impedence injectors mr2 owners club forum. Aem low impedance injector driver ford mustang forums. 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. Q3 and q4 are a pushpull low impedance driver for the fet gate. More amps equals more heat which our pcms drivers are not designed for. 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.
On a lowz injector current would be very high, which is. 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. Low impedance injector resistor pack honda how to youtube. Each box can control up to 4 injectors current control driver for low impedance injectors 4 channels available in three current versions. A zener diode d8 drops its supply voltage down from 28v too close to the opamp limit to a safer 18v. The ph injector driver module compensates for low voltage conditions cold weather, startup, etc. The flow during the time when the injector is half open is hard to predict. By adding a resistor box to a high impedance ecu really. If your car came with a low impedance injector and a resistor box, it will need to be bypassed. High impedance injectors on a low impedance harness. All injector dynamics injectors are high impedance. Holley v5 build 110 fuel system injection type custom low.
Low impedance injectors open as fast as stockers, providing smooth idle and crisp throttle response, but your factory ecu cant run them. 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. If you run 12 volts thru them with that low of a resistance you will make a high amount of current. Its perfectly safe and my crx always ran just fine with a resistor box and high impedance injectors. More power means faster response for the same injector architecture. Technical information low and high impedance injectors. Bosch lowimpedance injector for all 4cyl and mk23 vr6 cylinder engines. After selecting fuel systeminjection type custom, i select configure injector sets and enter the following. The injector you measured at 3 ohms is considered a low impedance injector. A high impedance injector 14 ohms used in a 12 volt system would require an operating current of 0. Low impedance injectors siemens deka 220 lb injector.