Injector Wiring
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Injector Wiring
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?
1970 Honda N600 600cc Twin
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DonTZ125
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Re: Injector Wiring
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
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?
1970 Honda N600 600cc Twin
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DonTZ125
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Re: Injector Wiring
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
DonTZ125
Thanks for the help. One less part to buy and wire. I will start in TunerStudio.
Thanks for the help. One less part to buy and wire. I will start in TunerStudio.
1970 Honda N600 600cc Twin
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kjones6039
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Re: Injector Wiring
DITTO!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.
IIRC we are using the same injectors. I strictly use PWM and have no problems with it at all!
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7