[Gmecm] Re: Running V8 with $A1 DIS code

[WopOnTour]

Not really
The formula for duty cycle is ON TIME/TOTAL PERIOD so on that waveform when 
the 60 degree goes low=begin dwell (COIL ON) and will spark (in bypass at 
least) on rising edge of 120 degree portion (after 60 degreees) hence 33%
HTH
WOT
----- Original Message ----- 
From: "William Lucke" <william.lucke at highspeedlink.net>
To: <gmecm at diy-efi.org>
Sent: Sunday, April 17, 2005 8:58 PM
Subject: [Gmecm] Re: Running V8 with $A1 DIS code


> Thanks for sending that diagram.
> Looks like the 4 cylinder uses 66% DC, rather than 33%.
>
>
> Will
>
>
>>Date: Sat, 16 Apr 2005 19:22:41 -0600
>>From: "WopOnTour" <wopontour at hotmail.com>
>>Subject: Re: [Gmecm] Re: Running V8 with $A1 DIS code
>>
>>Really?
>>Every N* IGN REF I've ever scoped was 50% (toggles every 45 degrees to
>>create a 4X) The only IGN REF I've ever known not to be 50% is the 4
>>cylinder engines- which are 60/120 (33%) What pin are you scoping, should 
>>be
>>PIN C (sometimes labeled "fuel control" in the schematics)
>>Regards
>>WOT
>>
>>----- Original Message -----
>>From: "William Lucke" <william.lucke at highspeedlink.net>
>>To: <gmecm at diy-efi.org>
>>Sent: Saturday, April 16, 2005 6:46 PM
>>Subject: [Gmecm] Re: Running V8 with $A1 DIS code
>>
>>
>> > That's a little clearer... thanks.
>> >
>> > So the reference signal from a V6 coil pack is 50% duty cycle, right?
>> >
>> > I think we've found the problem... the Northstar reference signal is 
>> > 33%
>> > duty cycle.
>> > So on a shot pulse, the RPM calculated for that pulse would be 1.5 
>> > times
>> > actual RPM and the RPM calculated from a long pulse would be 2/3 actual
>> > RPM. The calculated RPM would bounce back and forth between these 
>> > values 4
>> > times per revolution... AIUI.
>> >
>> > Any way to get V6 DIS code--any mask--to run with this coil pack?
>> > How does a 33% DC 4X compare to the DRP's from a distributor?
>> >
>> >
>> >
>> > Will
>> >
>> >
>> >
>> >>From: "Programmer" <lwester at lincsat.com>
>> >>Subject: Re: [Gmecm] Re: Running V8 with $A1 DIS code
>> >>To: <gmecm at diy-efi.org>
>> >>Message-ID: <002001c541df$c8dbaf00$4250050a at WESTER2>
>> >>Content-Type: text/plain;       charset="iso-8859-1"
>> >>
>> >>
>> >>No coil pack event every 60 degrees--measurement event, yes.
>> >>My stupidity apologies to the masses...brain got interrupted by typing
>> >>again. By comparing the time between pulses on the DIS V6, after seeing
>> >>the
>> >>7th slot (sync pulse), every other trigger slot is skipped. The second
>> >>pulse
>> >>fires #2/#5, 4th fires #3/#6 and 6th fires #1/#4. There is no coil 
>> >>firing
>> >>event for the other trigger slots--although they're still
>> >>monitored/measured. This actually provides a better timing advance
>> >>signal/measurement.
>> >>Anyways...this is correct for the '730.
>> >>
>> >>Over and out.
>> >>
>> >>P.S. Take a look at the LS1 code, someday...you'll see some pretty wild
>> >>timing values.
>> >>
>> >>Back to lurk mode...
>> >>
>> >>Lyndon.
>
>
>
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