Shelby Posted May 4, 2004 Report Share Posted May 4, 2004 what inj resistors you guys runing on the Hawk ecu ?? Link to comment Share on other sites More sharing options...
Gz21 Posted May 4, 2004 Report Share Posted May 4, 2004 I have the four injector driver unit and have 2.0 ohm injectors. Craig Link to comment Share on other sites More sharing options...
Shelby Posted May 4, 2004 Author Report Share Posted May 4, 2004 when you say driver unit , do you mean the inj ground signal wires from the hawk,,thats on the ground circurt right i'm meaning on the power feed to the inj's Link to comment Share on other sites More sharing options...
Gz21 Posted May 4, 2004 Report Share Posted May 4, 2004 Not sure exactly what you mean. When I said four driver unit...I meant the hawk has four separate injectors drivers which grond the injector when it is fired. Craig Link to comment Share on other sites More sharing options...
Shelby Posted May 4, 2004 Author Report Share Posted May 4, 2004 ok what your talking about is on the ecu side what i'm talking about is the power feed to the inj's not the driver side,, every inj system i have ever work'd on has had resistors on the power feed side of their inj's even our tbi had resistors on them,, but i have not heard of a single person mention any thing about useing them on their MPI set up's sure they will work with out them but your takeing a chance of burning out the ecu drivers if an inj was to short and they lessen the curent that the inj will see so as to not burn them out Link to comment Share on other sites More sharing options...
Joel Posted May 4, 2004 Report Share Posted May 4, 2004 The drivers in most aftermarket ECUs will handle either type of injector, although you need to avoid mixing them (open/close times, etc can cause odd AFR results between cylinders). You don't need resistor packs or anything to run either type of injector type (Saturdation or Peak-and-hold). Joel Link to comment Share on other sites More sharing options...
Shelby Posted May 4, 2004 Author Report Share Posted May 4, 2004 thanks joel i figure'd you'd have the answer to the question i know you don't dare do that with an oem ecu Link to comment Share on other sites More sharing options...
Boosted_One Posted May 4, 2004 Report Share Posted May 4, 2004 SDS requires the use of a resistor pack of sorts when you run low impedence. To be honest the choices are much wider using low impedence... Thanks WHATISIT Link to comment Share on other sites More sharing options...
Vanishing Point Posted May 5, 2004 Report Share Posted May 5, 2004 I havent dug through all the wiring yet,but when I ordered the sds they wanted to know the injector impedence. I just assumed they built the resisters in the ECU. I will have to check that out. Tony Link to comment Share on other sites More sharing options...
artinist Posted May 5, 2004 Report Share Posted May 5, 2004 what are the stock injectors? high or low? Link to comment Share on other sites More sharing options...
WTFISIT Posted May 5, 2004 Report Share Posted May 5, 2004 I think that Mike means low impedence. It's hard to find high imp. injectors over 550cc. Low impedence injectors without the resistors will (may) pull too much current through the SDS driver and blow it. I don't plan to test it, I'll take their word. I would think that it makes no difference if you wire them on the ground side (between ECU and injectors) or the hot side. I'm no EE, but something tells me the result is exactly the same. I just plan to use the instructions, which I don't have handy. Link to comment Share on other sites More sharing options...
mikec Posted May 6, 2004 Report Share Posted May 6, 2004 Yup, wired battery-resistor-injector-ECU-ground works, as will battery-injector-resistor-ECU-ground. However, doing it the first way is slightly safer... if a wire gets pinched to ground (the one after the injector going to the resistor or ECU) then the injector sees UNLIMITED current... it'll go wide open spraying fuel AND it'll overheat. Depending on how the injector dies as it overheats, it's possible it could spark, burn, or do something that could ignite the fuel. By having the resistor between the battery and injector, there's no way to over-current the injector. mike c. Link to comment Share on other sites More sharing options...
Boosted_One Posted May 6, 2004 Report Share Posted May 6, 2004 I think that Mike means low impedence. Â It's hard to find high imp. injectors over 550cc. Â Low impedence injectors without the resistors will (may) pull too much current through the SDS driver and blow it. Â I don't plan to test it, I'll take their word. I would think that it makes no difference if you wire them on the ground side (between ECU and injectors) or the hot side. Â I'm no EE, but something tells me the result is exactly the same. Â I just plan to use the instructions, which I don't have handy. Ya I got those flip flopped... the larger injectors are low impedence....thanks for clearing that up. Link to comment Share on other sites More sharing options...
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