Post your LS coil dwell tables/data here
1 Attachment(s)
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. |
Which LS Coils are you using? There are a few variants out there.
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From the other thread, applies here though:
Does anyone run the flowforce dwell settings successfully? I recall trying them and getting what felt like spark blowout. I've been using the HPTuners type settings mentioned elsewhere without issue. I re-pinned my flowforce setup for sequential. MS3X 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 https://cimg5.ibsrv.net/gimg/www.mia...cb52cab8e0.jpg https://cimg6.ibsrv.net/gimg/www.mia...c8eb4c7b6a.jpg |
Originally Posted by boileralum
(Post 1592393)
Which LS Coils are you using? There are a few variants out there.
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Originally Posted by natewin
(Post 1594061)
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 https://cimg5.ibsrv.net/gimg/www.mia...cb52cab8e0.jpg https://cimg6.ibsrv.net/gimg/www.mia...c8eb4c7b6a.jpg I've been chasing my tail with misfires under boost (and I mean like 10 psi+) and this totally cured my problem. +many cats |
Originally Posted by Graxis
(Post 1594545)
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 @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. |
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.
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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).
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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:
https://cimg9.ibsrv.net/gimg/www.mia...290b70baaa.jpg |
@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! |
Originally Posted by nigelt
(Post 1597794)
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:
https://cimg9.ibsrv.net/gimg/www.mia...290b70baaa.jpg |
Originally Posted by natewin
(Post 1594061)
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 https://cimg5.ibsrv.net/gimg/www.mia...cb52cab8e0.jpg https://cimg6.ibsrv.net/gimg/www.mia...c8eb4c7b6a.jpg |
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