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full thottle switch - how ammeters work - more info



Would an old dwell meter work? I still have mine kicking around from
point-type distributors.
----- Original Message -----
From: "marc_scirocco Qu?bec" <marc_scirocco@sympatico.ca>
To: "_Scirocco Mailing List" <scirocco-l@scirocco.org>
Sent: Tuesday, September 23, 2003 6:28 PM
Subject: RE: full thottle switch - how ammeters work - more info


> O2 sensor puts out mV (milivolts).
> Electronic box in the 8V motor picks up the mV off of the O2 sensor and
> transforms it into duty cycle.
> Duty cycle is basically a square wave. 50% on - 50% off when gas/oxygen
mix
> is at 14.7. Neither lean nor rich.
> Little connector close to the master cylinder on an 8V VW has this signal.
> Dwell meter measures this signal on the 90 degrees scale. So you aim for
45
> degrees (90 / 2 = 45) on a Dwell meter for proper mix.
>
> "Fuel Ratio Monitor" gadgets with a bunch of LEDs does pick up the mV off
of
> the O2 sensor, and displays proper mix acording to the proper gas mix
> (rich/lean). Simple and acurrate.
>
> Hope it helps.
>
> Marc
> '83 Scirocco
> '88 Scirocco Slegato
>
> -----Message d'origine-----
> De : scirocco-l-bounces@scirocco.org
> [mailto:scirocco-l-bounces@scirocco.org]De la part de ATS - Patrick
> Bureau
> Envoy? : mardi 23 septembre 2003 14:26
> ? : Dan Bubb; _Scirocco Mailing List
> Objet : RE: full thottle switch - how ammeters work
>
>
> thank you dan, and now I understand it was indeed my confusion causing the
> dumb questions.
>
>
> ATS - Patrick Bureau - txrocco@sbcglobal.net
> ----------------------------------------------
> MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> ICQ:32918816           |AIM:Texasscirocco
> ----------------------------------------------
>
>
> =>-----Original Message-----
> =>From: Dan Bubb [mailto:jdbubb@ix.netcom.com]
> =>Sent: Tuesday, September 23, 2003 1:03 PM
> =>To: ATS - Patrick Bureau; _Scirocco Mailing List
> =>Subject: Re: full thottle switch - how ammeters work
> =>
> =>
> =>Patrick:
> =>I wasn't mad at you. It's just that sometimes these posts get so far
from
> =>the original issue that you have to yell to get your point through!
> =>So, I was kind of yelling to make it through all the informative
> =>posts that
> =>had nothing to do with your situation.
> =>
> =>Yes, you measure mA to set the fuel mixture. But, ONLY on CIS-E! i.e.
16V
> =>Sciroccos. CIS-E is completely different, in an electrical sense, from
> =>CIS-lambda.
> =>CIS-E you measure mA. (16V Sciroccos)
> =>CIS-lambda you measure dwell. (8V Sciroccos with O2 sensor)
> =>CIS-E controls fuel pressure in the lower chambers using a differential
> =>pressure regulator that receives a continous current to control a valve.
> =>Adjusting current through the valve determines fuel flow through the
valve
> =>and the pressure in the lower chamber.
> =>CIS-lambda controls fuel pressure in the lower chambers using a
frequency
> =>valve. The frequency valve receives a pulsed current (pulsed from
> =>full on to
> =>full off probably around 30-60 hz) and the % time that the current is on
> =>determines flow through the valve and therefore pressure in the lower
> =>chamber.
> =>Probably more info than you wanted, but save the mA stuff for the 16V
> =>Sciroccos.
> =>Dan
> =>
> =>----- Original Message -----
> =>From: "ATS - Patrick Bureau" <txrocco@sbcglobal.net>
> =>To: "_Scirocco Mailing List" <scirocco-l@scirocco.org>
> =>Sent: Tuesday, September 23, 2003 1:16 PM
> =>Subject: RE: full thottle switch - how ammeters work
> =>
> =>
> =>> I am sorry if my email offended, it was not ment that way.
> =>>
> =>> well I have ordered a new multimeter that will do Dwell, so that will
> =>solve
> =>> the problem, but now I am confused, if dwell is not mA nor mV , then
why
> =>> everyone talks about a mA reading on the test lead or am I so
> =>dense that I
> =>> am mixing up things together and doing a process of self
> =>confusion and in
> =>> annoyance by everyone with my dumb ass questions..
> =>>
> =>>
> =>> ATS - Patrick Bureau - txrocco@sbcglobal.net
> =>> ----------------------------------------------
> =>> MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> =>> ICQ:32918816           |AIM:Texasscirocco
> =>> ----------------------------------------------
> =>>
> =>>
> =>> =>-----Original Message-----
> =>> =>From: Dan Bubb [mailto:jdbubb@ix.netcom.com]
> =>> =>Sent: Tuesday, September 23, 2003 9:08 AM
> =>> =>To: ATS - Patrick Bureau; T. Reed
> =>> =>Cc: Allyn; scirocco-l@scirocco.org; L F
> =>> =>Subject: Re: full thottle switch - how ammeters work
> =>> =>
> =>> =>
> =>> =>Dwell is NEITHER mA or mV.
> =>> =>I'm not a hotshit electrical engineer and don't know anything
> =>> =>about ammeters
> =>> =>and voltmeters, but I do know that you need to measure dwell on
> =>> =>your car and
> =>> =>you need a dwell meter to do it!
> =>> =>Get a dwell meter. Something that has a scale on it that says
"dwell"!
> =>> =>Then we can quibble about what the setting should be and how much
> =>> =>it doesn't
> =>> =>effect the power your engine makes!
> =>> =>Dan
> =>> =>
> =>> =>
> =>> =>----- Original Message -----
> =>> =>
> =>>
> =>>
> =>> _______________________________________________
> =>> Scirocco-l mailing list
> =>> Scirocco-l@scirocco.org
> =>> http://neubayern.net/mailman/listinfo/scirocco-l
> =>
>
>
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