Early hondas used low impedance injectors with a resistor. Megasquirt support forum msextra maximum low impedance. I just realized mustang injectors are high impedance so ill just use a set of those and everything will be fine. Here is an example of a low impedance injectors pulse voltage, current, and fuel flow. They handled the wiring and programming and tuningand charged you a pretty penny to do so.
Apr 07, 2009 if you are running high impedance injectors greater than 10 ohms, then set the. Injector drivers can drive high impedance injectors directly, or low impedance injectors with inline resistors 8 independent ignition outputs, with support for sequential ignition ignition outputs are compatible with many ignition modules and smart coils with internal ignitors. This value is a static value that the megasquirt will use to command ignition timing. The injectors are used with 6 ohm series resisters in the original djetronic circuitry limiting maximum current at.
Now, hoping matt cramer addresses the next question i have. Controlling both ignition and injection in an extremely compact form factor it is a very capable system at a very attractive price point. Here is an example of a low impedance injectors pulse voltage, current, and. Ph injector driver module injector drivers megasquirt ems. Megasquirt mustang plug and play gen 2 ecu tuner kit 8693 5. The ultimate provides 10 programmable peak and hold injector channels for driving any saturated high impedance or peak and hold low impedance injectors as well as loads of additional io eliminating the need for any other controllers, saving you unneeded complexity and weight. Diy autotune megasquirt engine management systems now available at summit racing setting up and tuning an efi engine for ludicrous power used to be something best left to a dedicated tuning shop.
If you are running low impedance injectors you should also pickup the flyback board kit as an upgrade to the unit. For lowimpedance injectors less than 3 ohms, you need to limit the current to avoid overheating the injectors. So i wanted to try megasquirt first with my previous setup on the 2. The megasquirtmicrosquirt is a community supported project aimed at the experienced installer and knowledgeable enthusiast. New injectors will specify which type they are or list the ohms. This allows full current to the injectors throughout the pulse width. This little ecu has thousands of users and is flexible and user friendly. Megasquirt support forum msextra high or low impedance. Since power is voltage times current, more current means more power. Pimp engine management systems made in the usa there are three different ecus in the pimp family currently available pimpx, pimpxs, and pimpxshift, all of which are ms3 megasquirt 3 based, plus one legacy version pimp that was ms2 megasquirt 2microsquirt based that we still sell parts, services, and accessories for but is no longer available new. Megasquirt mustang plug and play gen 2 ecu tuner kit 9495 5.
It resembles a v3 board in its features, only without provisions for large numbers of low impedance injectors. Add to cart 160 lb precision turbo ev1 low impedance. If you are not comfortable with this then the megasquirt and microsquirt systems perhaps arent for you. Megasquirt mustang plug and play gen 2 ecu tuner kit 86. Width modulation pwm, which is a software solution built in to megasquirt. This is a lot to ask an injector line up consisting of only a handful of options. The ms1 cpu is endoflife and available while supplies last. The fuel injector drives will max out at 5 amps each, enough to drive one low impedance or 4 high impedance injector per bank. For low impedance injectors less than 3 ohms, you need to limit the current to avoid overheating the injectors. If i decide to use low impedance 440cc injectors, does a stock bodied. I am using the original the djetronic injectors bosch 0280150034 and these are low impedance at 2. If i am set up for low impedance injectors, am i using pwm, a flyback board or resistors.
Injectors that have too small a flow rating can starve the engine of fuel at full power. High impedance injectors can run on 12 volts without problems. I think that stock gpz1100 injectors are low so that is something for everyone to be aware of who might use stock hardware. I thought the low impedance injectors would be better, i heard they are more responsive at lower rpm. Megasquirt pnp gen2 for 9000 miata track dog racing. Low or high impedence injectors mr2 owners club forum. Our line of universal and vehiclespecific fuel injectors includes flow rates from 15 lbs. No need for injector resistors and injector pwm should be turned off.
If you are running high impedance injectors greater than 10 ohms, then set the pwm time to 25. When it comes to replacing fuel injectors, step one is shopping at summit racing. The high impedance ev14s are not bad, but the low impedance version of them would be even better. If you are running lowimpedance injectors you should also pickup the flyback. If you are running high impedance injectors greater than 10 ohms, then set the. The symtech labs ph injector driver module is the only. Lowimpedance injectors require some form of current limiting. Low impedance injectors siemens deka 220 lb injector. It includes four peak and hold fuel injector drivers allowing for use of high impedance hiz or low impedance low z injectors. If you are running highimpedance injectors greater than 10 ohms, then set.
Weve got all the top brandsdeatschwerks, venom, acdelco, bosch, delphi, fast, and many others. This is also an excellent tool for testing your megasquirt ecu while you are. Injectors and fuel supply megasquirtr faq main page. To do sequential, you need to wire injectors to the ms3x output above. As i recall, megasquirt defaults to high impedance in the setup. The highresolution megasquirti code can help in this situation, but you lose the pwm current limiting mode so you have to run resistor packs with peak and hold lowimpedance injectors. The mspnp2 includes a very impressive feature set allowing you to convert a distributor based engine to distributorless ignition and sequential or semisequential fueling. I intend use megasquirt to drive 2 banks of 4 injectors using pwm with a duty cycle of 25% to limit injector powerheat dissipation.
The right fuel injector must combine the elements of fitment, coil impedance, flow rate, and tuning data into one injector specific to your engines needs. To get everything to fit without lots of heat sinking, microsquirt uses the st vnd5n07 from stmicroelectronics to drive the injectors. The amount of time required to open and close the injectors is specified in megasquirt as the injector opening time usually about 1. Low impedance injectors with a resistance of around 2. It includes four peak and hold fuel injector drivers allowing for use of highimpedance hi. The bitzracing cis to efi kit uses the megasquirt ecu for fuel management customized for the bitzracing efi kit.
Fjo low impedance injector driver powered by rpmware. Generic ms3 wiring, if you do lowimpedance injectors, you must wire fuel to the db37 in nonsequential. Fuel injectors are not a onesizefitsall type of product. The factory wiring wasnt designed with pwm current limiting in mind. If the resistance is between 8 and 16 ohm you have high impedance injectors. The microsquirt is a great matchfor 4cylinder engines and can also runv6, v8 and other engines too. What resistance to use with low impedance injectors. If i am set up for high impedance injectors, are my pwm setting correct, or am i at risk of burning something out. This will tell the megasquirt to ignore our ignition table and hold a fixed advance. If you are running highimpedance injectors greater than 10 ohms, then set the pwm time to 25. This can easily be measured by a multimeter across the two electrical terminals. The ecu itself will drive low impedance injectors, but with stock wiring it can experience noise issues.
The microsquirt is a great match for 4cylinder engines and can also run v6, v8 and other engines too. Designed with the diy tuner in mind to give your mustang all the options of a custom engine management system at a fraction of the cost. Diy autotune megasquirt engine management systems now. So lowimpedance injectors must have some form of current limiting. Builtin 2step rev limiter launch control with flat shift. Low impedance fuel injectors are preferred over high impedance, or saturated, fuel injectors for their precision and quick response time.
It includes four peak and hold fuel injector drivers allowing for use of highimpedance hiz or lowimpedance lowz injectors. If you are running lowimpedance injectors you should also pickup the flyback board kit as an upgrade to the unit. Both types can be used with megasquirt although high impedance tend to be easier to use. We also host a program called mspnp on demand where we can create. Tuning software is windowsmac based and is fully customizable. More power means faster response for the same injector architecture. Your megasquirt system supports either type of injector. You need to set the pwm parameters to match your injectors. They made high impedance injectors that far back, but the turbo application required more fuel flow thus low impedance. Low impedance injectors typically react faster and are more precise, but there are many high quality high impedance fuel injectors available these days. The software application you use to tune and configure your megasquirtii or. Microsquirt is a miniature, watertight version of megasquirt. Easy to install and setup, this standalone ecu comes with a 5.
If you want to use megasquirt to control a distributorbased ignition, this is often the best choice. The microsquirt is the latest addition to the popular megasquirt family. It is by being supported by the online community that enables the product to be offered at such low prices. The v3 microsquirt fuel injector drivers will clamp the current flow at 5 amps each, enough to drive one lowimpedance injector, or up to 4 highimpedance injectors, per bank.
Driver for low impedance injectors i know their is a convertor box, which i own one, but i would like to simplify the process, by just simply modding the pcm drivers. If you are unsure, measure them with your meter on the ohms setting. For up to 4 highimpedance injectors per bank, the driver will be fine, and high impedance. Low impedance injectors require some form of current limiting. Megasquirt mustang plug and play gen 2 ecu tuner kit 94. Technical information low and high impedance injectors. Megasquirt pnp2 standalone ecu by add serious tuning potential to your 19941995 5.
I know the ecm for the grand nationals can be altered to do this, since i have had it done to mine. The highresolution megasquirt i code can help in this situation, but you lose the pwm current limiting mode so you have to run resistor packs with peak and hold low impedance injectors. Check out the broad offering, there is something for everyone. What impedance injectors is it currently set up for. Our online catalog represents only a small fraction of the items we carry. Lower rev limit is the level at which the the fuel is reenabled in fuel cut mode.
Megasquirt has pulse width modulation to limit the current. Its simple physicslower resistance means that you get more current for a given voltage. Do i need low impedance or high impedance injectors. Note that it covers a portion of the proto area and the high side driver circuit on a v1. Onboard peak and hold drivers support both high and low impedance injectors no external ballast resistor is needed. Injector dynamics id2000 2200cc high impedance fuel injector the finest monstersized fuel injector available on the market, the injector dynamics id2000 fuel injectors are a. The fjo low impedance injector driver is built for the racing environment to withstand heat, vibration, dirt and water. However, you cant do this if you have low impedance injectors. 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.
Pimpx includes capability of controlling 4 low impedance injectors. If you have low impedance injectors less than 4 ohms, set the. It has been used in all sorts of conversions from drag cars to land speed record vehicles. Efi express is a company dedicated to providing quality upgrade parts, hardware, and software for a range of european vehicles. Designed for use with megasquirt ems systems, the symtech labs ph injector driver module supplants the injector drivers on either v2.
Controlling both ignition and injection in an extremely compact form factor itis a very capable systemat a very attractive price point. I have used some of the fuel maps posted in other threads as well as some other sources to get a basic fuel map set up. Qs on fricfrac ms setup and injector impedance megasquirt. Allows removal of stock maf sensor, if so equipped. We also have included a manifold pressure sensor thats good for up to 44psi of boost for you boost junkies while maintaining plenty of resolution for incredibly accurate control for you naturally aspirated guys too.
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