The manual indicated the following:
If you have low impedance injectors (less than 4 Ohms), set the:
PWM Time Threshold to 1.0 msec, and
PWM Current Limit to 75% (30% if you have installed the 'Flyback Board' daughter card).
You will tune these after getting the engine running. See “Setting the PWM Criteria†in this section. Failure to perform these steps can result in damage to your injectors.
I'm using low-Z injectors (Rover SD1 3.5 liter system) I have retained the OEM injector resistor pack. It was my understanding (iffy at best) that the resistors protected both the MS and the injectors.
Do the above requirements for PWM still hold as a start point? Why?
Thanks in advance.
Jack
Initial setup
Forum rules
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Initial setup
Good judgment comes from experience.
And where does experience come from?
Experience comes from bad judgment.
. . . . . . . Mark Twain
And where does experience come from?
Experience comes from bad judgment.
. . . . . . . Mark Twain
-
Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Initial setup
Jack,
If you are using resistors to limit the current to the injectors (many OEMs do this) then you treat the injectors as if they were high-impedance.
So if your total resistance (injector+resistor) is about 6 ohms or greater, set the PWM% to 100%, and the time threshold to 25.4 msec.
Lance.
If you are using resistors to limit the current to the injectors (many OEMs do this) then you treat the injectors as if they were high-impedance.
So if your total resistance (injector+resistor) is about 6 ohms or greater, set the PWM% to 100%, and the time threshold to 25.4 msec.
Lance.
Initial setup
Lance,
Thats' what I thought, but given the magnitude of the downside, toasted components, I'm glad I asked.
Thanks again,
Jack
Thats' what I thought, but given the magnitude of the downside, toasted components, I'm glad I asked.
Thanks again,
Jack
Good judgment comes from experience.
And where does experience come from?
Experience comes from bad judgment.
. . . . . . . Mark Twain
And where does experience come from?
Experience comes from bad judgment.
. . . . . . . Mark Twain
-
Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Initial setup
Jack,
Yeah, absolutely - injectors aren't cheap, and it'd be a shame to fry some!
Lance.
Yeah, absolutely - injectors aren't cheap, and it'd be a shame to fry some!
Lance.