Waste Spark Coils

[James Ballenger]

	I use the "smart", meaning auto-dwell, ignitors for two reasons.  The
Haltech does not control dwell explicitly and I am not confident in it's
ability to keep our coils charged at the high end and not fry them at the
low end.  The second reason is our engine.  It will rev to 14,100 rpm and
idle at 1,400rpm.  With this extremely high and low rev range, a constant
dwell would not work which necessitates the "smart" units.

	If your aftermarket unit supports a dwell function, then you could use the
much less expensive "dumb" ignitors, those without auto-dwell.  I think
there is a way to use dumb ignitors with a low revving engine without a
dwell function by keeping a constant dwell but I think this would depend on
your ECU.

Good Luck,
James Ballenger


>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of Franz, Paul
>Sent: Friday, February 23, 2001 9:58 AM
>To: 'diy_efi at diy-efi.org'
>Subject: RE: Waste Spark Coils
>
>
>James;
>
>I am ignorant of what all this equipment names are.  I started all this
>discussion without knowing the full details.
>
>I am replacing a Stock EFI with an Aftermarket EFI.  The
>Original car came
>with a single coil and distributor,  but the computer timed
>the spark.  I
>assume the ECU had the "igniter" in computer.  There was no electronic
>ignition module on the car.
>
>The New Ignition can not work with a distributor.  It needs to be a
>sequential spark of Waste Spark system.  I am going to start
>with Wasted
>spark so I will not need to have a cam position sensor.
>
>I do not understand the need for "smart" igniters.  Is this needed to
>interface with an engine management system?
>
>Paul Franz
>
>-----Original Message-----
>From: James Ballenger [mailto:vtjballeng at yifan.net]
>Sent: Thursday, February 22, 2001 8:34 PM
>To: diy_efi at diy-efi.org
>Subject: RE: Waste Spark Coils
>
>
>	$20 buys you a very strong two post waste spark coil (for two
>cylinders).
>The ignitors I am using now are Smart Bosch units that I have
>been able to
>source for $35 each so it is $55/2 per cylinder or $27.50 for my
>application.  You could use cheaper ignitors to reduce the
>cost, I use the
>smart ones because I rev from 1400 rpm to 14000 rpm.  These
>coils require
>some sort of mount.
>
>	The GM coils with ignitors built in are CNP and require 1 per
>cylinder.
>These are $40 per cylinder and I don't think they are any
>stronger than the
>waste spark coils.  I am also unsure of the ignitor circuit
>with regard to
>whether or not they are auto-dwell (Smart).  I have a GM part
>#, but I have
>to verify it.  These coils can be directly mounted.
>
>James Ballenger
>
>
>>-----Original Message-----
>>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>>Behalf Of Jurgen Hartwig
>>Sent: Thursday, February 22, 2001 10:43 AM
>>To: diy_efi at diy-efi.org
>>Subject: Re: Waste Spark Coils
>>
>>
>>> On a similar subject, Jurgen said 2nd gen RX7 but I am not Mazda
>>> literate so i don't know my first Gen from my fourth gen.  on the
>>subject
>>> of the RX7 coils, saying that they have that they have the
>ignitor in
>>them, does
>>> that mean that they are fired with a TTL level input?  if so
>>that would
>>> kill two birds with one stone for me.
>>
>>
>>Hi, 2nd Gen RX-7s are cars from 86-91.  I believe the earlier
>>cars used a
>>distributor and later cars used a different style ignition coil.
>>Remember, though, the leading coil is the only waste spark coil.  The
>>trailing coil is a dual post coil, but a trigger wire
>>alternately triggers
>>a single post.
>>
>>Regarding the input, I really am not sure.  At the risk of
>>sounding really
>>stupid, what does TTL stand for?  I have seen the acronym, but
>>never knew
>>it's meaning.
>>
>>Is there any way I can test for this?
>>
>>Regarding the GM coils, I thought $20 bought you the coil, and
>>you still
>>had to buy the igniters.  If I can get GM coils and igniter
>>for less than
>>$40, then that's a better deal than the RX-7 coils.
>>
>>Is the GM coil a self-contained unit that can be mounted
>>easily, or is it
>>part of a module (i.e. need a mounting bracket)?
>>
>>Jay
>>
>>---------------------------------------------------------------
>>-------------
>>To unsubscribe from diy_efi, send "unsubscribe diy_efi"
>>(without the quotes)
>>in the body of a message (not the subject) to
>>majordomo at lists.diy-efi.org
>>
>>
>
>---------------------------------------------------------------
>-------------
>To unsubscribe from diy_efi, send "unsubscribe diy_efi"
>(without the quotes)
>in the body of a message (not the subject) to
>majordomo at lists.diy-efi.org
>---------------------------------------------------------------
>-------------
>To unsubscribe from diy_efi, send "unsubscribe diy_efi"
>(without the quotes)
>in the body of a message (not the subject) to
>majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org