I want to run two seperate coils on the leading plugs. How do i split the signal wire
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Joined: Jun 2008
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From: Paradise
I want to run two seperate coils on the leading plugs. How do i split the signal wire
The leading coil pack has only one signal wire from the ignitor, can I tee it into two seperate coils? If not how doi go about it?
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Joined: Jun 2008
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From: Paradise
Is there any reason why this setup would not work?
I plan to Tee off the stock leading signal wire for my FD to Channel 1 & 2 inputs of a MDS DIS-4, and the channel 1 & 2 outputs of the DIS would be used to feed two MSD HVC Coils. I would then use the stock trailing wires to feed channels 3 & 4 inputs of the DIS and send the channel 3 & 4 outputs to the stock trailing coils.
Please let me know your opinions on this
I plan to Tee off the stock leading signal wire for my FD to Channel 1 & 2 inputs of a MDS DIS-4, and the channel 1 & 2 outputs of the DIS would be used to feed two MSD HVC Coils. I would then use the stock trailing wires to feed channels 3 & 4 inputs of the DIS and send the channel 3 & 4 outputs to the stock trailing coils.
Please let me know your opinions on this
Is there any reason why this setup would not work?
I plan to Tee off the stock leading signal wire for my FD to Channel 1 & 2 inputs of a MDS DIS-4, and the channel 1 & 2 outputs of the DIS would be used to feed two MSD HVC Coils. I would then use the stock trailing wires to feed channels 3 & 4 inputs of the DIS and send the channel 3 & 4 outputs to the stock trailing coils.
Please let me know your opinions on this
I plan to Tee off the stock leading signal wire for my FD to Channel 1 & 2 inputs of a MDS DIS-4, and the channel 1 & 2 outputs of the DIS would be used to feed two MSD HVC Coils. I would then use the stock trailing wires to feed channels 3 & 4 inputs of the DIS and send the channel 3 & 4 outputs to the stock trailing coils.
Please let me know your opinions on this
The DIS-4 will not drive the three or four channel rotary system like you're suggesting. The MSD doesn't switch channels or recharge the capacitor quickly enough to work on the rotary. You will need some combination of two DIS-2s or a DIS-2 and a something like a 6A to make it work on a rotary. This has been discussed in the past.
The alternative is to use a M&W or Autronic box, which are true 4-channel capable on the rotary.
The alternative is to use a M&W or Autronic box, which are true 4-channel capable on the rotary.
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Thread Starter
Joined: Jun 2008
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From: Paradise
The DIS-4 will not drive the three or four channel rotary system like you're suggesting. The MSD doesn't switch channels or recharge the capacitor quickly enough to work on the rotary. You will need some combination of two DIS-2s or a DIS-2 and a something like a 6A to make it work on a rotary. This has been discussed in the past.
The alternative is to use a M&W or Autronic box, which are true 4-channel capable on the rotary.
The alternative is to use a M&W or Autronic box, which are true 4-channel capable on the rotary.
In my searches I have seen you mention something about the Dis-4 not able to drive the rotary ignition. Please explain
That's what I'm saying. The DIS-4 uses two capacitors. It is a 4 channel unit, but the unit needs x amount of time to charge the capacitors, discharge them, and switch channels. I forget the specifics, but I've talked to MSD about this and they say it won't do it.
To run two DIS-2, you would have one running the two leading, and one running the two trailing. With the two channels of each box firing 180* apart, there is is sufficient time between events to let the units do their job. In a three channel system, like the stock FD, one DIS-2 and a 6A box, driving a dual post coil on the leading, would work as well.
The single box, true four channel, options are M&W, Autronic, maybe Motec, etc.
To run two DIS-2, you would have one running the two leading, and one running the two trailing. With the two channels of each box firing 180* apart, there is is sufficient time between events to let the units do their job. In a three channel system, like the stock FD, one DIS-2 and a 6A box, driving a dual post coil on the leading, would work as well.
The single box, true four channel, options are M&W, Autronic, maybe Motec, etc.
Joined: Oct 2001
Posts: 6,279
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From: Florence, Alabama
FWIW i control two Jacobs FC3000 ignition amps (located in the bin behind the driver's seat) w the lead ignitor wire. no problems since 2004. each amp in turn drives one MSD 8253 coil which drives one (lead) plug.
'works for me.
howard
'works for me.
howard
Thread Starter
Joined: Jun 2008
Posts: 870
Likes: 4
From: Paradise
That's what I'm saying. The DIS-4 uses two capacitors. It is a 4 channel unit, but the unit needs x amount of time to charge the capacitors, discharge them, and switch channels. I forget the specifics, but I've talked to MSD about this and they say it won't do it.
To run two DIS-2, you would have one running the two leading, and one running the two trailing. With the two channels of each box firing 180* apart, there is is sufficient time between events to let the units do their job. In a three channel system, like the stock FD, one DIS-2 and a 6A box, driving a dual post coil on the leading, would work as well.
The single box, true four channel, options are M&W, Autronic, maybe Motec, etc.
To run two DIS-2, you would have one running the two leading, and one running the two trailing. With the two channels of each box firing 180* apart, there is is sufficient time between events to let the units do their job. In a three channel system, like the stock FD, one DIS-2 and a 6A box, driving a dual post coil on the leading, would work as well.
The single box, true four channel, options are M&W, Autronic, maybe Motec, etc.
Also, are both channels for your leading DIS-2 running from the single FD lead signal?
The DIS-2 uses a single capacitor. The DIS-4 uses two. I had heard, probably through a forum like this, that the DIS-4 wouldn't work on a 2-rotor. Not understanding why I called MSD. What their "rotary guy" told me was that the box needs a minimum of 20* of crank rotation to charge the capacitors and for the electronics to switch channels. Now, saying it needs x number of degrees is probably not accurate, as the requirement is surely a given amount of time. 20* of rotation is a lot more time at 1000 rpm than it is at 10k rpm. Using degree of crank rotation is a lot simpler to explain though, than to tell someone the requirement in milliseconds and telling them to go figure it out. At any rate, unless you are content to run greater than 20* of timing split at all times, then the DIS-4 is not capable of running the whole show on either a true direct-fire, four channel system, or the wastespark, 3-channel FD system.
To do a true four channel system with MSD boxes, two DIS-2s would work. One box for leading, one box for trailing. This is with four input channels though, like you would get running a Haltech or Motec for example.
For the three channel, wastespark, FD system, a DIS-2 for the trailing and either two 6A type boxes (if you want to use two separate coils), or a single 6A type box and a single dual post coil. Can't use only one single channel box and two separate coils.
You would not be able to run two DIS-2 boxes on the wastespark, FD system. You would be back to the same thing you have with the single DIS-4 box. Trying to fire at least two plugs within 20* of crank rotation of each other.
There are variants of each system that could work. The short answer though is that MSD can't allow you to do what you want with the DIS-4 or a pair of DIS-2 boxes. Unless you have already purchased the boxes, I would recommend looking at the M&W or Autronic boxes. Gets everything done in a single, much smaller and easier to package box, and they're very powerful as well.
Thread Starter
Joined: Jun 2008
Posts: 870
Likes: 4
From: Paradise
The DIS-2 uses a single capacitor. The DIS-4 uses two. I had heard, probably through a forum like this, that the DIS-4 wouldn't work on a 2-rotor. Not understanding why I called MSD. What their "rotary guy" told me was that the box needs a minimum of 20* of crank rotation to charge the capacitors and for the electronics to switch channels. Now, saying it needs x number of degrees is probably not accurate, as the requirement is surely a given amount of time. 20* of rotation is a lot more time at 1000 rpm than it is at 10k rpm. Using degree of crank rotation is a lot simpler to explain though, than to tell someone the requirement in milliseconds and telling them to go figure it out. At any rate, unless you are content to run greater than 20* of timing split at all times, then the DIS-4 is not capable of running the whole show on either a true direct-fire, four channel system, or the wastespark, 3-channel FD system.
To do a true four channel system with MSD boxes, two DIS-2s would work. One box for leading, one box for trailing. This is with four input channels though, like you would get running a Haltech or Motec for example.
For the three channel, wastespark, FD system, a DIS-2 for the trailing and either two 6A type boxes (if you want to use two separate coils), or a single 6A type box and a single dual post coil. Can't use only one single channel box and two separate coils.
You would not be able to run two DIS-2 boxes on the wastespark, FD system. You would be back to the same thing you have with the single DIS-4 box. Trying to fire at least two plugs within 20* of crank rotation of each other.
There are variants of each system that could work. The short answer though is that MSD can't allow you to do what you want with the DIS-4 or a pair of DIS-2 boxes. Unless you have already purchased the boxes, I would recommend looking at the M&W or Autronic boxes. Gets everything done in a single, much smaller and easier to package box, and they're very powerful as well.
To do a true four channel system with MSD boxes, two DIS-2s would work. One box for leading, one box for trailing. This is with four input channels though, like you would get running a Haltech or Motec for example.
For the three channel, wastespark, FD system, a DIS-2 for the trailing and either two 6A type boxes (if you want to use two separate coils), or a single 6A type box and a single dual post coil. Can't use only one single channel box and two separate coils.
You would not be able to run two DIS-2 boxes on the wastespark, FD system. You would be back to the same thing you have with the single DIS-4 box. Trying to fire at least two plugs within 20* of crank rotation of each other.
There are variants of each system that could work. The short answer though is that MSD can't allow you to do what you want with the DIS-4 or a pair of DIS-2 boxes. Unless you have already purchased the boxes, I would recommend looking at the M&W or Autronic boxes. Gets everything done in a single, much smaller and easier to package box, and they're very powerful as well.
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