LS Coils: Internet Overload: Which ones are the good ones?!?

[Elroy]

My vote is for the D514's

[NewbVetteGuy]

This is an old thread, but just to close out where I went, I ended up getting the D514a (LS2 / LS7) coils with harness and bracket aka GM# 12573190 for $75 on an ebay. Knocked off the rust with the wire wheel on the bench grinder and painted them up nice.

ICT Billet relocation brackets 12573190 for $42 on Amzn. -Went Fender mounted as I just couldn't find a good spot to mount them on the bottom of the block.

-Setting dwell time in holley HP to 5 ms for cranking; 4 ms for running. I think these are fully charged to max current between 4 and 4.6 ms.
I'm running NGK Laser Iridium plugs with a stock 0.043" gap; I think the coils would be happy to run @ 0.050", but I wouldn't try to gap these Iridium plugs that wide.



Adam

[In-Tech]

D585 is the choice. After that, IGN1a.
The GM coils self limit on dwell so you can command whatever you want but it won't change it unless you are lower. The IGN1a's need their own relay per bank because you can really make a welder out of those bad mofo's.

[RW TECH]

This is an old thread, but just to close out where I went, I ended up getting the D514a (LS2 / LS7) coils with harness and bracket aka GM# 12573190 for $75 on an ebay. Knocked off the rust with the wire wheel on the bench grinder and painted them up nice.

ICT Billet relocation brackets 12573190 for $42 on Amzn. -Went Fender mounted as I just couldn't find a good spot to mount them on the bottom of the block.

-Setting dwell time in holley HP to 5 ms for cranking; 4 ms for running. I think these are fully charged to max current between 4 and 4.6 ms.
I'm running NGK Laser Iridium plugs with a stock 0.043" gap; I think the coils would be happy to run @ 0.050", but I wouldn't try to gap these Iridium plugs that wide.



Adam

The LS7 coil is the good one of the bunch, and dwell is actually closer to 3ms on those. Leave plug gaps as-received and definitely keep on using resistor plugs.

[NewbVetteGuy]

This is an old thread, but just to close out where I went, I ended up getting the D514a (LS2 / LS7) coils with harness and bracket aka GM# 12573190 for $75 on an ebay. Knocked off the rust with the wire wheel on the bench grinder and painted them up nice.

ICT Billet relocation brackets 12573190 for $42 on Amzn. -Went Fender mounted as I just couldn't find a good spot to mount them on the bottom of the block.

-Setting dwell time in holley HP to 5 ms for cranking; 4 ms for running. I think these are fully charged to max current between 4 and 4.6 ms.
I'm running NGK Laser Iridium plugs with a stock 0.043" gap; I think the coils would be happy to run @ 0.050", but I wouldn't try to gap these Iridium plugs that wide.



Adam

The LS7 coil is the good one of the bunch, and dwell is actually closer to 3ms on those. Leave plug gaps as-received and definitely keep on using resistor plugs.

I'm definitely keeping the resistor plug spark plugs (for increased spark duration as I DO care about fuel economy)-and because I'm running EFI and refuse to deal with random EMI noise gremlins.On the Iridium / Platinum spark plugs and gapping them, I think NGK said opening up the gap up to 7 thousandths is ok as long as you use a gap tool made for the thin wire electrodes.

Adam

[jalai]

...
I'm definitely keeping the resistor plug spark plugs (for increased spark duration as I DO care about fuel economy)...

Spark duration actually decreased with resistor plugs.
Example of three different resistance values