famousamos56

Having issues with spark blowout with flowforce LS coil kit.

EFR6258 setup.

Thought it was my **** tune/lack of skills with mega squirt, but turns out it is not.

Currently have the car at a really good tuner here in Colorado and he is having blowout issues also. We tried copper, iridium, heat range 6 and 7 plugs. Different gaps from .2 to .4.

Anything over 14PSI and we are getting spark blowout. Below 14psi and everything works great.

I am running batch ignition. Is this the culprit?

Anyone have any thoughts on this or any help for some way to actually test coil output besides pulling a plug and running test mode in tuner studio? My tuner cant get anything to help no matter what he does with dwell settings, he has tried messing around a bit with that. At this point he thinks there may be an issue with a bad/weak coil?

ManiacLachy

What are you running for dwell? Flow Force's original instructions have been updated following this thread:
https://www.miataturbo.net/ecus-tuni...ta-here-104619

But it still seems sequential is best for higher boost.

cpierr03

I'd highly suggest wiring for sequential with LS Coils, IME they tend to heat soak a bit in batch fire.

Can you post your tune?

andyfloyd

I run stock coils at 22psi and 400whp

I wish I could help you with your issue, but yea I dunno why people dont use the stock coils because they are just fine.

famousamos56

Want to close this out.

It was all due to a bad plug wire set, not exactly sure which or if it was multiples, but I ordered up a replacement plug wire set from flowforce and it fixed all my issues.

Still going to go sequential, but for now all is fixed.

Das

do you measure your plug gap with an electron microscope?

L4nthonyl

iTrader: (1)

What plugs are you running and what gap?

jetskibruce

Yes please andyfloyd! What plugs what gap. Noob here but I corrected my breakup at low boost with a gap at just under .25 with ngk iridium stock heat. But I can see plug and gap are critical for stock ignition.

yossi126

iTrader: (6)

Could be something not up to task in the fuel system. I went through 2 sets of D585 coils and 2 known good vvt coil sets, and fresh plugs.
I just now got to that conclusion after experiencing heavy cutouts during stop&go traffic. Wasn't in the logs up until recently that afr's went lean through the roof.
It all started gradually over months with little cutoffs in boost but I now suspect my fuel pump went bad. DW200 on the way.

andyfloyd

I measure it with my butthole actually. But no I run ngk ruthenium plugs gapped at .024.

andyfloyd

Yes that's a good gap. I use .024, iridium is good they work great. I run Ruthenium which is also made by ngk it's about the price of a iridium. Can't say I can tell a difference but they both run great with zero misfires

jetskibruce

No electron microscope here either, just making the .25 gap wire barely not fit. I am guessing coil blowout is more common with too rich a mixture? @andyfloyd you run high boost levels with good results on the stock coils, I think I saw one of your logs about 11.5 AFR? The thread here is coil blow out, so how can one tell for sure? That the problem as above might be bad mixture? I had stuttering break-up under boost, mostly went away with a tighter re-gap, got much worse with new stock gapped plugs, still learning.