Megasquirt Okay, few more questions
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Joined: Sep 2004
Posts: 4,106
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From: Anchor Bay, CA
Okay, few more questions
I download the newest firmware from the FAQ. Going to flash the MS with it later. But i have a few questions mostly just on what some parameters are.
1. Under Injector Characteristics
What is "PWM Time Threshold (ms) and Injector PWM Period (microseconds) actually DO. I just find people justing random values and i would like to know what im playing with.
2. Under Injector Control
I have ITBS with two injectors for each rotor located on them. So for setting up the injectors, would i selected port or TB injection? When i think TB injection i think single injector feeding multiple sources. My injectors are mounted AT the throttle body. But only serve the rotor they are on.
Also For the number of injectors and the alternating vs. simultaneous. i have it wired right now so that one injector on each rotor fires at the same time. So i think i would need alternating?
1. Under Injector Characteristics
What is "PWM Time Threshold (ms) and Injector PWM Period (microseconds) actually DO. I just find people justing random values and i would like to know what im playing with.
2. Under Injector Control
I have ITBS with two injectors for each rotor located on them. So for setting up the injectors, would i selected port or TB injection? When i think TB injection i think single injector feeding multiple sources. My injectors are mounted AT the throttle body. But only serve the rotor they are on.
Also For the number of injectors and the alternating vs. simultaneous. i have it wired right now so that one injector on each rotor fires at the same time. So i think i would need alternating?
The PWM injector characteristics refer to the signal that your low-imp injectors need to work correctly and not burn up. The time threshold I think should be set to the opening time, since IIRC its the time that the injector signal stays high when first opening. The PWM period defines the time period between PWM high pulses... basically how frequently the signal goes high and low throughout one injector event.
You'd select port injection; TB injection is for what you described, a single large injector feeding multiple cyls.
If you have the secondary injector bit of code turned on, then the alternating vs simultaneous won't do anything, since one injector channel is controlling the primary injectors and the other is controlling the secondary injectors, meaning that you couldnt just tell the primary on one rotor to fire and not the other. I believe that this box is automatically ignored if you have the secondary code running, but i've always set it to simultaneous anyway.
You'd select port injection; TB injection is for what you described, a single large injector feeding multiple cyls.
If you have the secondary injector bit of code turned on, then the alternating vs simultaneous won't do anything, since one injector channel is controlling the primary injectors and the other is controlling the secondary injectors, meaning that you couldnt just tell the primary on one rotor to fire and not the other. I believe that this box is automatically ignored if you have the secondary code running, but i've always set it to simultaneous anyway.
MegaSquirt Mod
Joined: Sep 2004
Posts: 4,721
Likes: 1
From: Maryland
The PWM injector characteristics refer to the signal that your low-imp injectors need to work correctly and not burn up. The time threshold I think should be set to the opening time, since IIRC its the time that the injector signal stays high when first opening. The PWM period defines the time period between PWM high pulses... basically how frequently the signal goes high and low throughout one injector event.
If you have the secondary injector bit of code turned on, then the alternating vs simultaneous won't do anything, since one injector channel is controlling the primary injectors and the other is controlling the secondary injectors, meaning that you couldnt just tell the primary on one rotor to fire and not the other. I believe that this box is automatically ignored if you have the secondary code running, but i've always set it to simultaneous anyway.
Ken
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