full thottle switch

[txrocco at sbcglobal.net (ATS - Patrick Bureau)]

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
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=>-----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" <jdbubb@ix.netcom.com>
=>> >To: "Rhett Farnum" <rocco_crossing@hotmail.com>, <t.piwonka@ttu.edu>,
=>> >  <scirocco-l@scirocco.org>
=>> >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" <t.piwonka@ttu.edu>
=>> > > >To: "scirocco" <scirocco-l@scirocco.org>
=>> > > >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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=>> > > >Scirocco-l@scirocco.org
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=>> > >
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