Difference between low impedance fuel injector and high. D2 reduces the fet turnoff time, at the expense of a rise in the fet drain voltage. Here is an example of a low impedance injectors pulse voltage, current, and fuel flow. Im wanting to drive 3 pairs of high impedance injectors but they are only 12. The mapecu dual channel low impedance injector driver drives low impedance fuel injectors from ecus designed to drive high impendence. Description downloads 4 channel low impedance injectors driver unit. These injectors provide excellent linearity with no discernible bounce at low pulse widths as commonly found in other injectors. Interesting that the install pdf says they are 65lb injectors but the replacement part number 522801 lists them as 80lb. 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 high impedance or low impedance.
Splice it in, hook it up to switched 12volts and ground, and youre on your way to the races. High impedance injectors usually about 1216 ohms can take a 12 supply directly, without a form of current control. This may be too much for the injectors, especially if you only have one or two lowimpedance injectors per driver. Your microsquirt efi controller will limit the injector current to 5 amps per driver. Driver for low impedance injectors toss me an email. This product allows the use of low impedance injectors with ecus designed for high impedance injectors only. Lowimpedance fuel injectors usually sideways rally team. With peak and hold drivers, the 12v is still delivered to the injector but current rises. Sep 18, 2005 with a high impedance injector 100% of the driver output goes into switching the injector. Our reputation is based on products that keep on working even under the harshest conditions.
The way you worded it is weird we are a participant in the amazon services llc associates program, an affiliate advertising program designed to provide a means for us to earn fees by linking to amazon. As a professional engineer with over 15 years experience in designing electronic systems for aerospace and military applications, fred originally focused the company on developing products for use in defense markets around the world. An injector used in a saturated driver system requires a high resistance value across its. Dec 30, 2018 fjo injector driver sep 20, im not aware of any problems running them off the stock turbo injector drivers and resistor. Highimpedance injectors typically range from 12 to 16 ohms of impedance, while lowimpedance injectors usually range from 0. Jun 19, 2007 low impedance injectors go as high as 160lbhr. There are only two types of products in this business. Fjo injector driver sep 20, im not aware of any problems running them off the stock turbo injector drivers and resistor. Also low load and driveabily is increased, as well as duty cyle of 815% reduction. Standalone low z injector drivers opinions ive used fuel timing piggy backs quite a but but never used one of these. Here is an example of a low impedance injector s pulse voltage, current, and fuel flow.
Ultimately if your ecu is able to correctly control a low impedance injector then there should be minimal difference. High impedance injectors typically range from 12 to 16 ohms of impedance, while low impedance injectors usually range from 0. Low impedance peak and hold injectors have a resistance of between 2 and 4 ohms. Running low impedance injectors on stock ecu w moates. Peak and hold injectors may also be called current sensing or current limiting driver. Rpmware is a dedicated team of industry veterans focused on creating incredible software applications for performance shops, warehouse distributors and manufacturers. These units are lowimpedance and require peak and hold injector drivers or additional resistors for saturation drivers. Low impedance and high impedance injectors cannot be used interchangeably without modification of the injector drivers.
This includes whether to buy a kit from a company such as drag or assemble your own kit, addressing the cooling, pcv, ignition, and drivetrain systems to make them work better with. I didnt really expect to see any problems but if any did exists it would be. Quantity add to cart email this product to a friend. I have the computer, manual, pinout, tuning software, 4cylinder wiring harness, tach adapter, lowimpedance injector driver, wideband oxygen sensor controller is. Testing has revealed nearly double the temperature when using low impedance injectors on the wrong. When tesing the injector at 12v and no pressure the injector opened quicker then it did at 14v and 45psi. Since replacing my resistors with an fjo aem also offers peak and hold module i. Lets say you measure a low impedance injector and find it has 2 ohms or. Above that, the low impedence type peak and hold were easier to control, especially at idle pulse width ie.
Early hondas used low impedance injectors with a resistor. The drive circuitry for this type of injector is simple and sometimes referred to as a saturated driver circuit. High vs low impedance injectors turbo buick forum buick. A valve and spring assembly from a current highz injector may weigh less than rd of the assembly from an older injector.
The versafueler provides separate peak and hold logic circuits for each injector. May 17, 2014 a low impedance injector driver is required to alter the current through the injector and prevent the injector coil burning out. Q3 and q4 are a pushpull low impedance driver for the fet gate. A low impedance injector creates a much stronger magnetic field opening the injector faster. An injector used in a saturated driver system requires a high resistance value across its coil 1216 ohms. Torque fjo injector occurs fjo injector a disproportionate amount of power is diverted to one wheel causing the car to steer without you turning the steering wheel. The mapecu dual channel low impedance injector driver is a true 4. The acceleronics versafueler is designed to provide years of troublefree service.
The ph injector driver module compensates for low voltage conditions cold weather, startup, etc. 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. Lowimpedance fuel injectors generally have coils with a resistance of 26 ohms. Fuel injector impedance and resistor box basics wrenchin. I wanted to make sure that they performed exactly as expected for both high and low impedance injectors. Difference between high and low impedance injectors.
The flow during the time when the injector is half open is hard to predict. With a high impedance injector 100% of the driver output goes into switching the injector. Highimpedance injectors, also called saturated fuel injectors, are sent a 1112amp current signal to open, and that current stays on until the injector closes. The injector opening time will change with fuel pressure to, as an example a friend set up a test rig on his desktop. Fjo racing lowimpedance injector driver this product allows the use of lowimpedance injectors with ecus designed for highimpedance injectors only.
Ms3 with low impedance injectors page 2 efi tuning. Technical information low and high impedance injectors. These have coil resistances 8 ohms or more and are the most common in use today. Ph injector driver module injector drivers megasquirt ems. Low impedance injectors with a resistance of around 2. This can easily be measured by a multimeter across the two electrical terminals. The most common, using a simple drive circuitry is sometimes referred to as a saturated driver circuit. This design uses the tried and tested national lm1949 injector drive controller chip.
With older generation injectors the low impedance design was implemented to help improve response or latency. These units are low impedance and require peak and hold injector drivers or additional resistors for saturation drivers. High impedance injectors vs sprint 500 official haltech forums. Todays high impedance injectors, however, are able to outperform those older low impedance injectors at larger flow rates due to their newer designs, tighter manufacturing tolerances and much lighter moving parts. High impedance injectors vs sprint 500 official haltech. May 17, 2018 torque fjo injector occurs fjo injector a disproportionate amount of power is diverted to one wheel causing the car to steer without you turning the steering wheel. Put a peak and hold injector driver in with peak and hold injectors and you can idle in the 14s stock idle is 14. Peak hold vs saturated injectors honda d series forum. Note that it covers a portion of the proto area and the high side driver circuit on a v1. Low impedance injectors open as fast as stockers, providing smooth idle and crisp throttle response, but your factory ecu cant run them. The low impedance injector driver is built for the racing environment to withstand heat, vibration, dirt and water. Fjo low impedance injector driver thanked 8 times in 7 posts. But as long as the injector drivers take the injector pulses from the stock wiring harness then convert the signal from the eec that would normally go to highimpedance injectors to drive the lowimpedance injectors, then i dont see a problem. Fjo low impedance injector driver powered by rpmware.
That extra current flowing through them causes a lot more heat within the injector. Injectors are either high impedance or low impedance. For low impedance injectors, ground the gnd hole on the adapter board to a gnd hole on the main board do not connect to sg. Aug 18, 2016 the majority of injectors are high impedance. Oct 22, 2018 fjo racing products is very pleased to fjo injector a standalone low impedance injector driver. Fjo racing products is very pleased to fjo injector a standalone low impedance injector driver. The ph injector driver module is optimized for use with 4a peak and 1a hold low impedance fuel injectors. High impedance fuel injectors marren fuel injection. The acceleronics versafueler us patent 6836721 simply splices in between your current ecu and the big honkin injectors that your monster motor needs. You generally have to use an injector with an impedance matching your driver circuit. Bosch lowimpedance injector for all 4cyl and mk23 vr6 cylinder engines. High vs low impedance injectors general tuning discussion. Just use the datalogs to figure out what the injector slopebreakpointoffset should be.
Fjo 341b programmable standalone ems with wideband. High impedance saturated injectors have a resistance of between 10 and 14 ohms. Low impedance injectors siemens deka 220 lb injector. The fjo driver allows the injector to hit its peak current, causing it to. Since 1986, marren fuel injection has been focused on developing products and services that improve the performance and overall experience for anything efi equipped. The thing with low impedance injectors are that they need a driver to work properly. 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. Add to cart 160 lb precision turbo ev1 low impedance. A peak and hold injector driver is far more complex than simply. Holley efi fuel injectors feature a precision lapped disc valve, highquality brass windings, and hightemp orings. What is the difference between low impedance and high. Fuel injectors are controlled by one of two possible injector control circuits called drivers.
Need rubber wrx fuel injector oring or fuel injector. Sep 09, 2006 above that, the low impedence type peak and hold were easier to control, especially at idle pulse width ie. The low impedance injector driver allows the mapecu3 or mapecu2 to drive as many low impendence injectors as required using a single switched output. This high current would burn out the injector if used for the entire injector opening time therefore the low impedance. I have read that the aem injector driver does not like the bosch s. Peak and hold manual features current control driver for low impedance injectors 4. The peak supplies up to 4 amps to snap huge injectors open. It is important to know which type your injectors are. A low impedance injector driver is required to alter the current through the injector and prevent the injector coil burning out. The fjo low impedance injector driver is built for the racing environment to withstand heat, vibration, dirt and water. This was stateoftheart 12 years ago, and it is still more powerful and capable than many programmable options on the market today. Oct 09, 2012 highimpedance injectors, also called saturated fuel injectors, are sent a 1112amp current signal to open, and that current stays on until the injector closes. Injectors can be classified in two categories, as either highimpedance or lowimpedance.
721 968 1341 214 1175 1370 529 457 952 505 731 1239 230 1451 228 70 1010 1464 685 783 391 379 895 914 821 880 103 849 618 472 921 511 1036 1171 959 1378 341 485 1122 10 889 823 394 1356 365 1370