I'd Like to test a way of determining opening time

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Bluehaze
MegaSquirt Newbie
Posts: 33
Joined: Thu Apr 28, 2011 3:07 pm
Location: Melbourne, Australia

I'd Like to test a way of determining opening time

Post by Bluehaze »

G'day All.
Firstly, I'd like to say it's been just over a year now since I first fired up my MS'ed 1961 Holden, and it's been an absolute hoot :D . Lots of tuning, learning, a bit of dyno time where I even converted the dyno bloke who'd never seen a MS system. After about 3000 kilometers, I have a reliable, smooth and a surprisingly torquey inline six. A big thanks to all those helpful experts who have so far shared their wisdom.
Anyhow... :idea:
I have a theory regarding determining the true opening time for my injectors. So far, all I've read that this is a "Best Guess" setting, usually condidered around 1mS at 13.2 volts. (Please correct me if I'm missing something)
So, I figured could it be as simple as to get the motor running at a constant state, say 2000 rpm at no load, and switching between 2 squirts per and 1 squirt per cycle. Doubling the pulsewidth and conversely halving the cycles leaves us with the only constant masked off being injector open time. So, say if the EGO reading drops when the pulses are doubled, then the opening time may be a bit long. From here its just a case of fiddling with the opening time until the EGO remains unchanged when switching between Two and One squirts per cycle.
Does that theory hold water?
1961 Holden with 3.3l inline 6 megasquirt fuel and ignition.
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kjones6039
Master Squirter
Posts: 618
Joined: Sat Jul 22, 2006 7:02 pm
Location: Eureka, Nevada USA
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Re: I'd Like to test a way of determining opening time

Post by kjones6039 »

That's exactly the same way that a lot of other users are doing it....................

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
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