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Just wanted to give credit where it was due. Zac Brown made this video long ago. I thought it was really interesting, at that time the D585 was everyone's bandwagon response as the BEST oem coil. He tested teh firecore D585's as well and wasn't impressed. THe IGN1A were on another level though.
D585's (and these are the "high output" FireCore versions)
D581 Pretty big difference!
I remember these videos. I have a set of 581’s. I’ll toss those on and reset the dwell tables.
I have to say, if I would have done that test like that, I’d have got zapped!
R5724-8
23-24 psi
Single turbo, so can’t distinguish banks.
Solid 14.3v
Grounds are good. It’s a stock harness.
Smaller gap fixed it.
Stock harness just means its old and should be inspected, issue I found was a stock harness on an LS3. A stock ECM should be pretty easy to identify a misfire, even with a single turbo.
Originally Posted by Forcefed86
Do you run resisted boots? I run the same plug and a 5k resisted NGK boot.
Why are you guys running a projected tip heat range 8 plug at that power level? That's probably part of your gap issue, 1200whp or 30-32PSI barely puts a heat mark on a 7 heat range non projected tip like the 3346/BR7EF and it stays happy to 37+psi even with 200+ IAT's.
Stock harness just means its old and should be inspected, issue I found was a stock harness on an LS3. A stock ECM should be pretty easy to identify a misfire, even with a single turbo.
Why are you guys running a projected tip heat range 8 plug at that power level? That's probably part of your gap issue, 1200whp or 30-32PSI barely puts a heat mark on a 7 heat range non projected tip like the 3346/BR7EF and it stays happy to 37+psi even with 200+ IAT's.
They aren't projected. I'm down to the strap bend on 15ish lbs on an 8 non-intercooled. Can't see needing/wanting a colder plug. Was even thinking about going to a 9. If the plug doesn’t foul, I don’t see the reason not to run a hotter plug? That and I REALLY like the hard boot NGK tips. The positive hard lock with easy install/removal is night and day over the soft rubber boots IMO. I’d run them just for that!
Here is a new 8 on 15ishlbs and 17*. Maybe its just too much timing...
They aren't projected. I'm down to the strap bend on 15ish lbs on an 8 non-intercooled. Can't see needing/wanting a colder plug. Was even thinking about going to a 9. If the plug doesn’t foul, I don’t see the reason not to run a hotter plug? That and I REALLY like the hard boot NGK tips. The positive hard lock with easy install/removal is night and day over the soft rubber boots IMO. I’d run them just for that!
Here is a new 8 on 15ishlbs and 17*. Maybe its just too much timing...
Your plug still looks a little soft to me. Do you mean wanting a hotter plug? I guess not if you are going to turn up the boost, those plugs are good for more like 40 psi
Your plug still looks a little soft to me. Do you mean wanting a hotter plug? I guess not if you are going to turn up the boost, those plugs are good for more like 40 psi
You are correct... yanno the "NGK 8" with all them numbers before it! R5671A-8 4554 is what I run.
Dang it man U gotta quit talk'n! Now you got me thinking I Sync'd the timing wrong and I've got alot more lead in it than my IGN map says... Once it's in the bend I usually stop. Don't want to push the tune up hard at all. What do one of your non-intercooled 7's look like after a pass with decent boost in them?
Last edited by Forcefed86; Jul 26, 2022 at 03:00 PM.
You are correct... yanno the "NGK 8" with all them numbers before it! R5671A-8 4554 is what I run.
Dang it man U gotta quit talk'n! Now you got me thinking I Sync'd the timing wrong and I've got alot more lead in it than my IGN map says... Once it's in the bend I usually stop. Don't want to push the tune up hard at all. What do one of your non-intercooled 7's look like after a pass with decent boost in them?
LOL! I'm perfectly fine with the mark being into the bend but mine usually have a full heat mark around the base usually to the first thread.
Originally Posted by IGN-1A
HI ALL, I would suggest a Spark Plug Gap of .045" when the IGN-1A coil is fitted AND the coil charge time is 8 ms.
You are correct, a N/A SPG of .065 is fine and also fine for 200 KPA boost pressure.
Another tip, use silicon grease on the plug boot.
So .065 up to 29PSI is ok with those coils, that's pretty neat. I haven't been that brave, I accidentally ran .040 with boost on stock coils with TR6's and it was fine so its believable with the increased output.
I never gave coils a lot of thought, except if I am using one that takes the short or long coil wire, lol. I remember when Holley came out with the HP and Dom, there was a note in there about using, I think, the heat sing. coils, to contact them. They later eliminated whatever the diff was. Was always curious what the diff was, dwell time?
From this data, the D585 looks better than the D581. So interesting the spark jump test RX7 did showed different.
Or maybe I’m missing something?
At any rate, the IGN-1A is vastly superior. But very cost prohibitive for my budget.
Cool chart! Do they state the purpose of the asterisk on the D585?
I agree, be curious how much its actually worth on a "normal" setup with a functioning OEM coil pack vs the fancy ones. Most guys with the fancy stuff are on big power methanol setups where an OEM coil is not optimal.
D581's on this setup w methanol on 41lbs. 5.3 107mm (not an SBE and heads had work). Reportedly went quicker, but saw it did a 4.50 at ls fest before it crashed.
Hellbesnts10 also went 6.80@209 on D581's on M1.
Last edited by Forcefed86; Jul 28, 2022 at 11:38 AM.
