edis question 2

[ranchero]

Hay there,
is it possible to use 8 coils on a edis 8 module?
I'm askin this becouse i dont want anny sparkplug wires going acros the engine so i can mount 8 small coils on the inner fenders and still use wasted spark.

thanks

MSII V3 code 2.25

[Turbo4V]

If you do a search on EDIS COP (coil on plug), you'll find a bunch of info related to EDIS, Waste spark, and COP's (or 8 coils as you're referrring to them).

I've been running an 8 COP EDIS-8 setup (waste spark) for quite a while now with no problems, and the car runs extremely well. You'll want to wire the pairs of coils in series.


Justin

[allen22]

If you do a search on EDIS COP (coil on plug), you'll find a bunch of info related to EDIS, Waste spark, and COP's (or 8 coils as you're referrring to them).

I've been running an 8 COP EDIS-8 setup (waste spark) for quite a while now with no problems, and the car runs extremely well. You'll want to wire the pairs of coils in series.


Justin

Can I ask what car your COP's came off of?

Thanks
allen

[Turbo4V]

Allen,
The COPs came off of a 2003 Ford Mustang Cobra, they were actually specific to the valve covers that I was using.

Justin

[allen22]

Allen,
The COPs came off of a 2003 Ford Mustang Cobra, they were actually specific to the valve covers that I was using.

Justin

Thanks, I'm trying to find some for my V6 Nissan motor, I believe they need to be the two wire type can you confirm that?

allen

[Turbo4V]

The ones that I'm using are the two wire type.

Justin

[allen22]

Thanks,
I think that's the general rule for an EDIS COP install, must be 2 wire instead of 3 wire.

Fred

[Turbo4V]

Correct,
EDIS can only drive the +12v/GND style coils, not the logic level, 3wire style.

Justin

Thanks,
I think that's the general rule for an EDIS COP install, must be 2 wire instead of 3 wire.

Fred

[ranchero]

So, if i read right i can use 8 coils with .7 Ohms and use them as wasted spark.

Just figuring out to wire them up, can't be that hard to do huh.

Main problem to find COP's, i live in Belgium and these are realy hard to find here.

MSII V3 code 2.25

[Turbo4V]

For each channel, you'd wire as follows (for ford small block firing order, 13726548):

+12v switched -> coil 1 +
coil 1 - -> coil 6 +
coil 6 - -> EDIS Channel 1

And so on for each of the cylinder pairs. (1&6, 3&5, 7&4, 2&8 )

Your firing order might be different, so you'd combine differnent pairs.

Justin

[ranchero]

So, correct me if i'm wrong.

The power goes to + on coil 1 and the minus of that coil to the + of coil 6 and the minus of coil 6 to a edis shannel.

If this is correct im saved and can use a verry neat setup of wasted spark on my engine.

See my page www.users.skynet.be/ranchoman

MSII V3 code 2.25

[Turbo4V]

Correct!

Justin

So, correct me if i'm wrong.

The power goes to + on coil 1 and the minus of that coil to the + of coil 6 and the minus of coil 6 to a edis shannel.

If this is correct im saved and can use a verry neat setup of wasted spark on my engine.

See my page www.users.skynet.be/ranchoman

MSII V3 code 2.25

[Curtis]

I am setting up a porsche 928. Wiring the EDSI to COP, a question:
Connecting the EDSI Drive, does it matter which pin (left or right) facing the connector is connected to the ESDI drive output?

The other pin (ground) I assume as on the coil packs? However, there is a 25 mirco cap in series with ground for radio suppersion.

I assume the cylinder pairs receive the same drive and all cylinders should be ground with or without a capaitor?

Is this correct?

c

[jsmcortina]

The coils do not connect to ground.
One end goes to +12v, the other end goes to the EDIS module.

James

[Curtis]

does it matter which pin is connected to (switch+12) and which to ESDI unit?

[jsmcortina]

does it matter which pin is connected to (switch+12) and which to ESDI unit?

Probably yes, this will determine the spark polarity. One polarity results in slightly less plug wear.

JAmes

[PSIG]

Coil polarty? This excerpt is interesting. I have used the pencil test before and it's more like a tiny plume than shower of sparks. I don't know how critical it really is but some claim a measured performance difference. I check mine, except for dual-terminal waste spark coils, where one plug fires forward and one reverse all the time. Tech manuals claim this is why they require more power to fire - as much as 5000 volts due to the backwards polarity on one plug. If wiring COPs in series, this might be important.

... Spark plugs are sensitive to polarity and they will not function as
efficiently it the secondary coil voltage is of the wrong polarity.

The reason for this sensitivity is as follows. The centre electrode has
a higher temperature, normally, than the ground electrode so that more
electrons will be released from the hotter metal surface of the centre
electrode than from the ground electrode.

If the centre electrode polarity is more negative than the ground
electrode (which is connected to chassis) then the earth electrode will
attract electrons from the centre electrode; but if the coil secondary
voltage polarity is reversed, the voltage needed to cause electrons to
pass from the earth to the centre electrode (i.e. to make the gap
conductive) is increased.

Reversed coil polarity can be shown on an oscilloscope but a less
sophisticated test is to disconnect a plug lead with the engine running
and form an arc between the plug terminal and the end of the cable.

If the point of a soft lead pencil is placed in the path of the arc then
a shower at sparks will be created, either on the plug side (if polarity
is correct) or on the cable side (if the polarity is incorrect). The
condition of the plug will also indicate reversed coil polarity if this
situation has prevailed for some time. The use of the oscilloscope is a
more sophisticated means of determining the states of the engine,
ignition and fuel systems than the condition of the spark plug.