Toyota coil paks

[Bruce]

Gm unit is alot more compact, and has mounting points.
Bruce



----- Original Message -----
From: <don.broadus at exeloncorp.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 15, 2001 3:43 PM
Subject: RE: Toyota coil paks


> The Toyota 90919-02238 pak is 6.5 inch long
> from boot to top of connector. They look very
> much like the Ford  DOHC COP paks.you could
> connect a plug wire and remote mount the pak.
>
>
>
> -----Original Message-----
> From: Jay Vessels [mailto:jvess01 at yahoo.com]
> Sent: Thursday, November 15, 2001 12:50 PM
> To: gmecm at diy-efi.org
> Subject: RE: Toyota coil paks
>
>
> Hi there!
>
> First, has anyone yet figured out the app. these coils
> are for (i.e. year, model, engine size)?  How big are
> they?
>
> How 'bout this for a drive circuit for sequential coil
> firing (versus waste-spark)?  I'll use a SBC as the
> example but this would work for any distributor car
> with some adjustments.
>
> Mount a Hall Effect sensor in the timing cover so you
> know where #1 is.  Distributor stays in, timed
> normally, EST system intact including module, but no
> coil or plug wires (of course).  On an SBC this gives
> you an easy way to get timing advance as well as an
> oil pump drive.
>
> A 3-bit counter (4-bit 74xx part, set to count 0-7
> then repeat for an SBC) drives a 1-of-n decoder (SBC
> wants 1-of-8).  Counter increments each time the
> module triggers.  Each output line of the 1-of-n
> decoder turns on an indivdual CMOS switch (a pair of
> 4066 parts would work) whose input is driven by the
> EST module and whose output is connected to an
> indivdual coil.  The Hall Effect sensor is used as the
> input to the counter reset line so it can sync with
> the engine.  Might want to have a disable such that it
> doesn't fire ANY coil until the Hall Effect cam sensor
> triggers the first time so no coils are ever fired out
> of sequence.
>
> This method lets you drive n coils indivudually, fires
> them in sequence when the ignition module fires the
> coil (giving you spark advance), and is syncronized
> with the engine through the cam position.
>
> Coil dwell time might be a concern, and there might be
> some circuit timing issues (i.e. make sure the counter
> increments on the falling edge since you'll want it to
> increment BEFORE firing the coil on the rising edge)
> but it sounds reasonable to me.
>
> Doesn't seem to be that complicated of a circuit, the
> hardest part being mounting the cam timing sensor.
> Other issues include the normal EMI and automotive
> power supply concerns.  Just an idea off the top of my
> head.  Anyone care to pick it apart (there's gotta be
> holes in it)?
>
> Jay Vessels
> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
> 1994 Chevrolet Cavalier Z24 Conv., 3.1V6 MPI
>
> --- don.broadus at exeloncorp.com wrote:
> > I have been kicking around a couple ideas.
> > a real crude one for carb apps.would be
> > to add a brush terminal to the rotor to
> > physically make contact with each cap terminal
> > the centrifugal advance would move the rotor
> > to provide limited advance.  The coil term
> > would have +5 VDC on it. A better idea would
> > be an optical shutter wheel. EFI apps. A crank
> > trigger advanced 36 deg would trigger a one shot
> > timer that would be  delayed to clock a
> > counter to fire at 0 deg TDC or no delay
> > for full advance ,might be possible for the
> > EST line to control the one shot. A 4017
> > counter IC would be a good start.
> > Just prelim thinking.
> >
> > -----Original Message-----
> > From: Jeremy Gonyou [mailto:jeremygonyou at yahoo.com]
> > Sent: Wednesday, November 14, 2001 6:54 AM
> > To: gmecm at diy-efi.org
> > Subject: Re: Toyota coil paks
> >
> >
> > Hi Don,
> >
> > How are you controlling those coils?
> > Coil on plug would be a cool project for P4s.  I
> > think
> > it would take some serious EE work unless there is
> > an
> > external controller available...
> > Thinking aloud.  Anybody have similar ideas?
> >
> > Jeremy
> >
> > > Stompin around the junk yard last night
> > > I found 4 Toyota 90919-02238 coil on plug
> > > paks like the LS 1 uses. The car was
> > > crushed so I don't know what year it
> > > was. It was a 4 cyl. DOHC. Until
> > > I can find some LS1 paks the
> > > Toyota ones will work. The connector is
> > > marked 1,2,3,4
> > > 1= +12V
> > > 2=ground
> > > 3=TTL signal
> > > 4=ground
> > > a 5 volt TTL low to high transition will
> > > fire the coil. They draw 6.5 amps even
> > > up to 1KHZ square wave. great spark even at .060
> > > plug gap.
> >
> >
>
>
>
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