Microtech and LS1 Coils

[sprinter86]

Hey lads,

i have a microtech LT10-s and an x4 ignitor box, but i have LS1 coils that have inbuilt ignitors and require a positive pulse to spark.

SO could someone tell me if the ecu sends a positive or negative pulses to x4 box?
if the pulses are positive(i hope they are) then can i discard the x4 module and run the ecu pulses straight to the coils?

the coils only require 3-5v to reach maximum spark.

tell me what u think guys!!

cheers

[Duk]

Speak to Michrotech. Having said that, some simple electronics should be able to invert a negative signal and provide a +5v trigger.

[sprinter86]

i agree, a simple transistor switch and a resistor would do the trick, but i would rather avoid that option, there seems to be no point in using the X4.
I spose if someone could put an led test light in one of the 4 output ignition wires out of a microtech the ecu and tell me if there + or -. when running, that would be my answer.

microtech people take time to help unfortnuatly.

cheers

[131OWN]

Microtech ECU's run a -ve trigger from the ECU to the "X Box". It will need to be a fast transistor switch as you need to maintain aprox 5ms of dwell for the LS1's through out the entire rev range if the switch is out by a couple of ms at high rpm the timing my be out a mile

[sprinter86]

Thanks for that mate, i was worried about the time it takes to switch a transistor. thats why i did not want to take that option.

As you can see in the diagram above, the LS1 coil has 4 wires, 12v, Earth, ecu earth and ecu +5v. From factory the 'ecu earth' is always earth, it has something to do with the misfire detection system i think. would it be possible to connect the ecu +5v to a constant 5v source(ie. resistor in-line connected to 12v ignition) and running either the the pulsed microtech earth to 'ecu earth' OR the pulsed earth from the X4 Module.

I dont know whether the ignitor inside the LS1 coil could work this way, or if it is possible to do this at all. Just trying to get around this problem!!!

[sprinter86]

also can the X4 module be worked to switch a positive pulse??? instead of its negative output?

[sprinter86]

ok, after finally getting a call back from microtech, i have a solution.

It turns out that when you have the microtech configured to run a X4 box, the microtechs 4 coil outputs(grey wires) are changed to a +12v pulse, this would then go to the X4 box and be converted to a negative pulse for operation of 'standard' style coils.(yellow wires)

so basically i can run the microtechs 4 wires straight from the ecu to the coils, with no x4 box.

Cheers for the input guys.

[Boostbitz]

glad you got your result finally....