andym

I made this post because it is a bit difficult to track down reliable dwell information for the LS coils that we love to use on our cars.
Below is the table that I've settled on lately that has worked the best for me. I'd like to know what you guys use and what problems you have had.

I am running my coils as sequential ignition.

boileralum

iTrader: (8)

Which LS Coils are you using? There are a few variants out there.

natewin

From the other thread, applies here though:
D585 coils (possibly from Flowforce)
Sequential
Flowforce harness (Repinned, cut the pair of duplicate wires and wired them into new wire run to ECU)
Flowforce bracket

Spark Duration: 1.0 ms
Spark Hardware Latency Latency: 40 usec
Cranking Dwell: 6.0 ms

andym

My understanding is that my coils are aftermarket purchased from Napa d585 coils.

Graxis

I LOVE YOU

I've been chasing my tail with misfires under boost (and I mean like 10 psi+) and this totally cured my problem. +many cats

natewin

You are welcome. I was actually running fixed or maybe a different table when I installed them. Then I went and followed their website instructions and had the same issue, would get to about 10psi and blowout.

@nigelt Any thoughts on what is going on here? Not sure how many people have brought this up or mentioned anything like this to you.

nigelt

iTrader: (10)

Natewin, thanks for tagging me. We came up with the dwell table in our instructions by picking apart the many dwell tables used by GM OEM ECUs, and then basically going full conservative so as not to over dwell. Seeing that this seems to be an issue, we will take another careful crack at it and then post back here.

yossi126

iTrader: (6)

Can confirm spark blowout at 15 psi with Nigel's map. Switched to Natewin's and so far so good (as in no idea what I'm doing but my misfires are gone).

nigelt

iTrader: (10)

Fun fact, I was looking back over my tune from way back, and I used to run the same dwell settings Natewin posted too. It sounds like we built a bit too much safety factor into our dwell settings for some. This is what we have settled on now, which should give some more grunt while still being well on the safe side of auto-discharge:

cpierr03

@natewin curious if you're batch firing or sequential?

I too had a ton of spark blow-out with the original FlowForce table - your parameters got rid of most of it, but still had some minor ignition break-up. I ended up having to drop the whole dwell table 0.1ms, then another 0.1ms in the 4800 RPM range.

I'm wondering if it's because I'm still using batch fire - I'm in the process of re-wiring for sequential now, just curious what your experience has been.

EDIT: Never-mind I now see your post calls out sequential. Hopefully that does it for me!

stevos555

Which table for Dwell and Battery - which table to use for sequential not forced induction table? There are slight differences in battery table between Nigel and Natewin..

nachomiata

what do you have set to dwell for us MSPNP2 dudes without a dwell/RPM table?