Poweraxel

im currently running 3 crane boxes off my stock ignitor and Haltech E6K but decided i might try something different looking for opinions/criticisms on this set-up:

4 coils... 2 leading,2 trailers
2 MSD DIS-2 units

1 DIS unit for the 2 trailers
1 DIS unit for the 2 leadings
or run 1 DIS unit for each rotor

id rather run 2 boxes instead of 4! and i dont want to split a single channel digital 6 out to the 2 leading coils..

if i remember correctly someone was commenting on how this might /might not work due to MSD charge time circuitry???

RETed

This will work.&nbsp Switch the trailings to "normal" mode and the leadings to "wastespark" mode.


-Ted

Poweraxel

got it!

fdracer

What's the purpose of using the 2 channel DIS-2 for the leading? Since they fire wastespark could you just split a 1 channel box to fire both leading coils? Are their disadvantages to doing this as opposed to using a 2 channel?

Poweraxel

yes they wastespark..i want every coil to have its own channel thats why i dont want to split a single channel to run 2 coils

fdracer

Could you get rid of the wastespark then with a 2 channel and 2 coils?

RETed

Why?&nbsp That alternate wastespark is used as a far trailing spark and cleans up combustion and emissions.&nbsp You'll need to stick in a 3rd spark plug for each rotor housing a another pair of coils to mimic the stock set-up...


-Ted

fdracer

i see, makes sense

moespeed

You can’t run 1 DIS for each rotor.
In the DIS-2 unit there is just one amplifier that does work. This amplifier does so on just one channel at a time for 20 degrees.

If you want an amplifier per plug use:
(Cheapest. Only need to buy leading coils and one more crane)
2 cranes for 2 leadings.
2 cranes for 2 Trailing.

(Less cheap)
2 cranes for 2 leadings.
1 DIS-2 for 2 Trailings.

(More Money)
2 DIS-6 for 2 leadings.
1 DIS-2 for 2 Trailings.

Poweraxel

do you mean a digital 6?

i understand you cant run a DIS-2 per rotor

are you saying that 2 DIS-2 wouldnt work in a seperate DIS--> 2 leadings DIS--> 2 trailers?..as Ted said above set the leadings as "waste" and the trailers as "normal"
The DIS-2 to the 2 leading coils should work..its a "wastespark" configuration just like stock

moespeed

Thanks. I meant Digital 6, not DIS-2
If you want a coil to get all the power available from each amplifier then go with 2 Digital 6 to 2 leadings.

A single DIS-2 will fire one channel only at a time.
If you send a trigger to channel 1 input, the unit will fire channel 1 output. etc.....
Seems that you will only use one channel of this DIS-2 unit to fire both leading coils. One channel to power two coils. You will not be using the DIS-2 for its main ability(multi channel). It will work, but not sure if it would be better than your single crane driving your double output coil.

VELCRO SHOES

What is WASTESPARK?

Poweraxel

so a DIS-2 wouldnt work if i split the leading signal to channel 1 and channel 2..wastespark??

RETed

An ignition spark (system) that fires in two different combustion chambers.


-Ted

RETed

Unless MSD changed the functions on the DIS-2 units, moespeed has no idea what he's talking about.&nbsp Hey moespeed, you ever touch a MSD DSI-2 box?&nbsp There should be a wastespark DIP switch setting that lets the DIS-2 fire both ignition channels at the same time.&nbsp Like I said before, this will work on the leadings with two coils.



-Ted

waynespeed

Ted, are you saying that the DIS-2 units can fire two separate leading coils, using separate wires to the primary side of each coil? If so, have you tried it?

Thanks in advance,
Wayne

moespeed

How are you planning to split it?
What will give the two input signals?
There is a way to split the signals with the E6K, but you will need two trailling igniters from a 2nd gen RX-7 to run leading and trailings.

moespeed

RETed, Before you start please read the above posts carefully.
I always thought of you as a smart guy. I hope you are smart enough review the posts.
The main reason for my response was due to the first question being an A & B question.
A)- 1 DIS unit for the 2 trailers
1 DIS unit for the 2 leadings
B) 1 DIS unit for each rotor
Your answer was YES. I hope everyone reading this thread realize you were saying YES to A, not B.
I mainly wanted to show that B could not work.

My next part of the response was to show that the DIS-2 is a single amplifier that works on one channel at a time. It can’t fire two channels at once. If you do not know this, then you now have been informed.
Here is some more information.
The WASTESPARK switch on the MSD actually allows the unit to know the proper RPM of your setup to help with its RPM related features. This also allows the unit to give the proper spark duration.
To answer your question. I never touch a DSI-2, but I installed a DIS-4 back in March,1999 on one of my cars without a problem.

Increase the knowledge!!!!

Poweraxel

this is what i was thinking on how to split it...you have a 2 pin harness (+-) going to the dual post leading coil from the stock ignitor..now why couldnt i split both (+-)leads to 2 seperate channels "1 and 2"?

any comments or feedback?

waynespeed

So moespeed, you are saying that even if you connected the leading output from the haltech and used a "y" connection to bring the signal to the DIS-2 unit both channels would not be able to fire at the same time. Therefore, you are saying that both outputs from the DIS-2 units cannot be fired at the same time.

waynespeed

I see no problem with this other than an extra (wasted) spark. However, this will still maintain the amp/coil setup. The only issue is who is right about the simultaneous firing of both channels.

fdracer

why would the dis-2 have a wastespark mode if it couldn't fire both channels at the same time? isn't this the very meaning of wastespark? i don't understand.

Poweraxel

Thats the millon dollar question!

waynespeed

The wasted spark mode will enable the unit to "sense" the proper RPM. This could mean, instead of an 8,000 rpm limit in wastedspark mode this would mean 4,000.

For more info: http://www.msdignition.com/pdf/dis2_dis4.pdf

waynespeed

These guys have the million dollar answer (915) 855-7123. (MSD).