[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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
=>
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l