Toyota coil paks

[don.broadus at exeloncorp.com]

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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