Haltech and MSD question.
 

I am running an E11 and two MSDs. A digital-6 for the leadings and a DIS-4 for the trailings. Got the car fired up and i am loosing trailing spark above 6500 RPM. I put an osilliscope on the signal to the DIS and the signal looks fine. I ran across this on another fourm.


Most important on the 'Ignition Setup' would be that the 'Ignition Spark Edge' be set as a 'RISING' signal. The MSD DIS ignition boxes can run with either 'Dwell Modes' meaning 'Constant Charge' or 'Constant Duty' signal. On 'Constant Duty' Haltech recommends 50% duty. On 'Constant Charge' I would not go below 2.0ms and at 1.5ms and lower some of the DIS boxes have problems firing.

I have both MSDs setup for constant duty and wanted to try seting the DIS-4 at constant charge to see if it makes a difference.

My questions are, 1-In the E11 software there are places to set the dwell mode for leading and trailing outputs indepindantly But i dont find a place to change the constant charge time, constant duty %, and the spark break time independantly. 2-Can the digital-6 also be set to constant charge like the DIS-4?

TIA
Allen

Alright guys, spent most of the day scouring the web and found a lot of contradicting info.

I searched "haltech" in MSDs forum and MSD says that both the digital-6 and DIS-4 NEED a constant charge with a time of 2.0-2.5ms to work. I was just going to switch it and try but i don't want to fry $800 worth of MSDs. Can anyone verify this info???

TIA
Allen

Set up both leading and trailing the same.

Spark Mode...................Wasted Spark
Ignition Spark Edge...... Rising
Trailing Spark Edge....... Rising
Dwell Mode................... Constant Duty
Trailing Dwell Mode....... Constant Duty

Constant duty 0-100%...... 50%
Spark break time................ 600

Oh BTW. Good luck with that DIS 4 box. Hint! :)

Thanks Cris. In a drunken rage i set the Haltech to constant charge 2.0ms on both the leading and trailing last night. The ignition worked perfectly, or at least the timing was rock steady up to redline. Will it hurt to leave it like this or is that just putting a bandaid on a shitty product *is that the hint;)*?

I agree.
Nothing but headaches when we tried to get it run on our 20B.
Best power came when I set it to 30% - go figure.


-Ted