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full thottle switch
Patrick,
I think you're missing the point. A $7 multimeter or a $5000 multimeter...
it doesn't make any difference.
When you connect an ammeter across a battery (or any source of power, such
as a connector to the differential pressure regulator or whatever the 8v
equivalent is), the ammeter measures the flow of current from one lead to
the other. It is designed to be used in a circuit to measure the flow
through that (resistive) circuit. It has virtually no resistance of its
own.. so when you connect the leads, (at least in a perfect world) the
current goes to infinity and the voltage drops to zero across the meter
(bad!). If it weren't for the fuse built in to your ammeter, you would see
the insulation melting and bubbling off the ammeter leads.
-Toby
On Fri, 19 Sep 2003, Patrick Bureau wrote:
> well I think its my 7$ multimeter taht is not worth crap.
> so I bought an OTC automotive digital multimeter to solve the problem
> as we have in the past gotten a Dwel multimeter to get a proper reading on this car
>
>
> "T. Reed" <treed2@u.washington.edu> wrote:
> Uh... that's not good!
>
> You ought to try to remember that whenever you connect an ammeter to
> something you are shorting it out!
>
> -Toby
>
> On Thu, 18 Sep 2003, ATS - Patrick Bureau wrote:
>
> > my setup is CIS with knock box 2L 8v.
> >
> > I tried to get mA from the testing plug (near brake booster) but I can
> > onlyget mVolts from it.
> >
> >
> > ATS - Patrick Bureau - txrocco@sbcglobal.net
> > ----------------------------------------------
> > MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> > ICQ:32918816 |AIM:Texasscirocco
> > ----------------------------------------------
> >
> >
> > =>-----Original Message-----
> > =>From: scirocco-l-bounces@scirocco.org
> > =>[mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Dan Bubb
> > =>Sent: Thursday, September 18, 2003 11:08 AM
> > =>To: Rhett Farnum; t.piwonka@ttu.edu; scirocco-l@scirocco.org
> > =>Subject: Re: full thottle switch
> > =>
> > =>
> > =>Got me!
> > =>They may have a ground or power wire in common, but that's all.
> > =>Maybe somebody rewired your car?
> > =>Using the cold start injector to provide additional fuel has been
> > =>hashed out
> > =>endlessly by everybody thinking they need more fuel, but it's a crummy
> > =>solution because 1) the distribution between cylinders sucks 2)
> > =>there is no
> > =>control over the quantity of fuel injected, it's either off or on.
> > =>Doesn't keep people from trying it.
> > =>If your WOT switch does activate your cold start injector you might think
> > =>about rewiring back to the original schematic cause it would certainly be
> > =>injecting more fuel than your engine needs.
> > =>Dan
> > =>
> > =>
> > =>> If it doesn't use the cold start injector why is my switch
> > =>wired to it???
> > =>>
> > =>>
> > =>>
> > =>> Peace Out,
> > =>> Rhett
> > =>> Rocco_crossing
> > =>> '83 Rocco (autocross ready, tune up, install harness, and finally I may
> > =>get
> > =>> to makeing it look better!!)
> > =>>
> > =>>
> > =>>
> > =>>
> > =>>
> > =>> >From: "Dan Bubb"
> > =>> >To: "Rhett Farnum" , ,
> > =>> >
> > =>> >Subject: Re: full thottle switch
> > =>> >Date: Thu, 18 Sep 2003 08:01:34 -0400
> > =>> >
> > =>> >It does not use the cold start injector!
> > =>> >The cold start injector is used only when the engine is
> > =>cranking (and not
> > =>> >always then) and no other time.
> > =>> >
> > =>> >The full throttle switch increases DPR current on CIS-E (16V), which
> > =>> >increases fuel flow through the normal injectors.
> > =>> >On CIS-lambda (8V) it increases the duty cycle of the frequency valve
> > =>again
> > =>> >increasing fuel flow through the normal injectors.
> > =>> >
> > =>> >On CIS-lambda closing the switch almost always increases
> > =>engine speed and
> > =>> >smoothes out the idle (especially if you have a big cam) because the
> > =>engine
> > =>> >goes open loop (stops looking at O2 sensor output) and richens the
> > =>mixture
> > =>> >and most engines like to idle richer than stochiometric.
> > =>> >NOTE: I guess this assumes your car is correctly tuned and FV
> > =>duty cycle
> > =>> >oscillates around 50% at idle.
> > =>> >
> > =>> >On CIS-E closing the switch again causes the engine to go open
> > =>loop. DPR
> > =>> >current is supposed to go to 16mA if engine speed is over 2500
> > =>RPM. On my
> > =>> >car DPR current goes to a steady 8mA with the car idling. I'm not
> > =>> >absolutely
> > =>> >sure how the engine will respond by closing the switch at idle. I would
> > =>> >assume if the mixture is set at 10mA (Bentley recommended setting) then
> > =>if
> > =>> >it goes to 8mA by pressing the switch the engine will lean out a little
> > =>and
> > =>> >drop a few RPM. In any event I don't think it will make a huge
> > =>difference
> > =>> >as
> > =>> >long as your mixture is tuned correctly.
> > =>> >Dan
> > =>> >
> > =>> >
> > =>> > > It uses the cold start injector. If you ahve voltage that means you
> > =>> >injector
> > =>> > > is either shot or clogged. Try fom fuel inj. cleaner and if that
> > =>doesn't
> > =>> > > work replace. ~$5 at a bone yrd.
> > =>> > >
> > =>> > >
> > =>> > >
> > =>> > > Peace Out,
> > =>> > > Rhett
> > =>> > > Rocco_crossing
> > =>> > > '83 Rocco (autocross ready, tune up, install harness, and finally I
> > =>may
> > =>> >get
> > =>> > > to makeing it look better!!)
> > =>> > >
> > =>> > >
> > =>> > >
> > =>> > >
> > =>> > >
> > =>> > > >From: "Robert Piwonka"
> > =>> > > >To: "scirocco"
> > =>> > > >Subject: full thottle switch
> > =>> > > >Date: Thu, 18 Sep 2003 00:48:07 -0500
> > =>> > > >
> > =>> > > >When I press the full throttle switch at idle should the car bog
> > =>down?
> > =>> > > >Cause it doesn't. However I tested the voltage on the output and I
> > =>> >gets
> > =>> > > >12v
> > =>> > > >when activated and not 12v when not, so it appears to be working.
> > =>> > > >
> > =>> > > >Also how does the full throttle switch richen the mixture? Does it
> > =>> >change
> > =>> > > >the dpr current or use the cold start injector or what?
> > =>> > > >
> > =>> > > >Thanks
> > =>> > > >Robert Piwonka
> > =>> > > >
> > =>> > > >
> > =>> > > >_______________________________________________
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> > =>> > >
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>
> ATS - Patrick Bureau - txrocco@sbcglobal.net
> '85 2.0L Prowler Orange, Kamei X1 Rocco
> '84 1.8L Silver Restoration and '83 Rocco Trailer Project
>
>
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