Page 1 of 1
Injector Wiring
Posted: Sat May 04, 2013 7:44 am
by 8803
I am using a throttle body injection. The injector has only (2) wires. One is +12v and the other is ground according to its manual. The MS2 wiring shows a +12v coming from the Main Relay and another wire coming from Pin 32 of the DB37 connector. Does that mean Pin 32 is an ECU controlled ground?
Re: Injector Wiring
Posted: Sat May 04, 2013 1:27 pm
by DonTZ125
That's exactly how it works - by connecting the injector to ground for a tiny fraction of a second at a time, current flows, the injector opens for that brief moment, and a carefully calculated spurt of fuel is sprayed into the engine.
Re: Injector Wiring
Posted: Sun May 05, 2013 7:36 am
by 8803
The throttle body I am using has a low impedance injector(1.2ohms) I plan on putting an Omite ballast resistor(825F7RS per MS manual) in series to limit current. Where should this resistor be put. In series with the switched 12+ source to the injector or between the MS(pin 32) and injector?
Re: Injector Wiring
Posted: Sun May 05, 2013 7:47 am
by DonTZ125
Don't bother - the MS can be set up for
PWM current limiting, allowing you to run a Lo-Z injector with no resistor.
Re: Injector Wiring
Posted: Sun May 05, 2013 8:25 am
by 8803
DonTZ125
Thanks for the help. One less part to buy and wire. I will start in TunerStudio.
Re: Injector Wiring
Posted: Sun May 05, 2013 11:11 am
by kjones6039
DonTZ125 wrote:Don't bother - the MS can be set up for
PWM current limiting, allowing you to run a Lo-Z injector with no resistor.
DITTO!
IIRC we are using the same injectors. I strictly use PWM and have no problems with it at all!
Ken