Why do my LS2 coilpacks suck?

[TimTurboZ]

1bar to 1.2bar *17/18psi* it is blowing out the spark.

Brand new set of AC Delco d585 ls2 truck coils
Brand new spark plug wires
New ngk iridiums *7iex* 0.7mm gap

I followed wiring intructions for the coilpacks off of this forum.

Everything is getting power, relay is supplying power, gounded wires to the head.

I was wonering where people come up with the dwell figure of 5.0/5.5ms at idle? Megasquirt recommends 4.0ms. *may have said no higher than 4*
I spoke with a very knowledgable tuner who said 3.2-3.6ms

Also online I read to keep the charge time at 3.0ms through the rpm range.

I had success with a 0.35mm gap with copper plugs but that is very small and i had a rough idle.

I dont see how its blowing out the spark with these coilpacks.

Any input would be appreciated.

Tim.

[TimTurboZ]

I plan to try around a .45mm gap in the morning and see how the car idles and runs. Just seems odd to have to bring down the gap. Feel like I wasted $ and time. I would have bought those auatralian coilpacks that bolt in exactly like oem and called it a day.

[TimTurboZ]

New ngk iridiums *7iex* 0.7mm gap


I was wonering where people come up with the dwell figure of 5.0/5.5ms at idle? Megasquirt recommends 4.0ms. *may have said no higher than 4*
I spoke with a very knowledgable tuner who said 3.2-3.6ms

to clarify im running the stock gap the plugs came at about .030in since thats the more common measurement referenced for the sparkplug gap. So I needed a .015 gap to not experience blowout.

Also I do have NISTUNE i was just reading Megasquirts dwell info online.

I found deeper in a LS coilpack thread on here more dwell discussion and charts. None showed a need to have it higher than 4.67ms I just am interested if higher dwell times led to my coil packs failing previously.

[julio]

Maybe its a connectivity issue? I can't remember what your setup was in your build thread, but if memory serves me, they are COP with no wires? If you have a set of wires lying around or can steal temporarily from another vehicle, try that as a simple check.

[TimTurboZ]

It was COP, I am running a set of sparkplug wires with the coilpacks mounted above the fuel rail.

double checked I had the copper ngk sparkplugs gapped at .013in I set the irdium plugs to that gap

I then adjusted my kconstant and injector latency to get my idle right. i had checked the timing after I had the new set of coilpacks on, its at 15btdc

With the new set of coilpacks it seemed to run richer. I adjusted my fuel map and it seems to have a nice flowing afr thur the rpm range. Idles and drives well.

It did seem to cut under more throttle/fast acceleration. It was just my less than 2mile drive home to and from work where I tested the new tune, but i had 3 nice straights. probably did 90mph on one pull where i seemed to feel a slight spark blowout. its at ~11.3:1AFR at ~15psi doesn't seem too rich as in fuel being an issue for the cut.

On the way to work it was going to 10.3:1 at full boost/when it would cut, before I drove home I leaned it out to that low 11 range.

[julio]

When I first installed my NisTune, my speed limiter was set to ~80mph. I'm sure that's not your problem, but worth checking everything at this point.

[TimTurboZ]

appreciate a reply. yes I have been over all the limiters and cut features in the ecu.

My drive tonight it definitely misfired. I was getting on it pretty good the other week nearly redlined it in 5th gear numerous times going thru 3rd and 4th gear WOT with no problem. May have to try another set of copper plugs.

the day before I changed my old ls2 coilpacks out i took a 7hr round trip in the car, with SPIRITED highway driving along the way. noticed it was missing a decent amount and more often after. When I put the iridium sparkplugs in the tip of the #2 cyl spark plug had broken or melted off.

I thought it was the fact I regapped those copper plugs like 4 times but my friend doubted that was the issue. Nothing seems wrong with the motor but just figured Id mention it, my friend said that pointed to a lean condition but the car definitely wasn't running lean.

Sucks I spent the ~$60 on these spark plugs and the car doesn't seem to like them. I have a drift event coming up end of December that I desperately am trying to attend! This car so close to being perfect I'm hoping it gets there.

[TimTurboZ]

UPDATE: After going over my wiring and not finding any issues I decided to go back in a check my dwell settings.

I had followed roughly some info I found on this forum the other week to adjust my DWELL DUTY table, It seemed very close to what I had been using already to try and keep the dwell time near 3.0ms thru the rpm range.

Reverting it back to the stock dwell duty settings it seems great NO CUT. I just did probably 10 pulls in the car adding some more fuel and lowering my timing in between a few runs.

I will try opening the sparkplug gap more possibly tomorrow to see if things are really all good and well with my ignition system. Going to drive a bit more today and check the tune.