67rally

iTrader: (5)

I'm thinking about swapping out my older triangular D581 coil packs for something more streamlined, but don't want to have it re-tuned.

How do the older triangular shape (D581) coil packs compare to the round LS2 (D514A) or newer round truck (D585) coil packs. How about something flatter like the LS3, LS7 (D513A), etc.

I'm currently running the D581's and they are fine, but I want to relocate/hide the coil packs this winter. The D581's are bulky and they way they mount isn't conducive to making a smaller footprint. In fact, I've only seen one company that makes a bracket for them and it's not as small as I'd like. The problem is that the bottom mounting hole lines up with the spark plug boot, so you can't mount them face to face.

I tried the LS1 (D580) coil packs hidden under a set of Edelbrock covers, and I felt like the car didn't pull as hard in the higher RPM's. Just a butt dyno, but I swear I could feel the difference.

67rally

iTrader: (5)

So the question is...Can I get away with running a different style coil pack without a re-tune?

And on a side note, if you have relocated the coils on a 1st gen Camaro, where'd you put them?

Here's my current setup, trying to stay "Old School".

2000PewterT/A

Relocate them to anywhere you want, I have seen people do the inner fenders, on the firewall etc.

Undertow74

iTrader: (45)

I run the flat style LS3 coils without any issues and they look a lot better!

Paul Bell

iTrader: (9)

So many people argue that coil changes don't add or subtract any horsepower but so many other argue that they "feel" improvements when going to a different coil.

Here we have one guy saying he felt a loss of power going to LS1 coils.

The only coil that's really "better" in performance is the round truck coils with the heat sink. They've been tested and have more milliamps output. These are also the only coils that will need a tune update.

Without claiming they "make" more power, I will say they improve an engine's response.

I do believe the first original LS1/6 coils have less output.

You can hide the coils anywhere you want under the hood. You'll just need to extend the coil harnesses and get custom (make em' yourself) plug wires.

LS1/6 coils have different plugs then all other versions.

ss4chad

iTrader: (26)

I have the truck coils on my 02 Camaro under the cowling. you cant see them at all and I got a custom wire harness from Current Performance Wiring. I asked for a specific length and asked them to cover the wire bundle with the factory style wire loom and they did a great job!

Put the coils on the frame next to the radiator and have Current Perf make a harness, then you make your own wires and secure them with billet clamps. It would be nearly invisible and clean up the engine bay. But then you have to buy new valve covers, where does it end!!!!!

Chad

67rally

iTrader: (5)

Thanks guys. I had the LQ9 coils on there when I got it tuned.. I switched to the LS1 coils and it didn't feel like it pulled as hard in the high rpms. I had some other issues that led me to put he LQ9 coils back on (not due to performance), and I immediately picked up the top end again. Maybe the tune had something to do with it? Maybe the LS1 coils were bad? Again that's just seat of the pants real world info.


I'll probably look for a set of LS3 coils and try to find a stealthy location for them. I was just looking for ideas. I tried mocking the LQ9 coils up in a couple of different locations, but due to their mounting holes, they still end up taking up a fair amount of space.

I'm not worried about lengthening the pigtail, or fabricating longer spark plug wires. I'm just waiting to see a location I haven't thought of yet.

dr_whigham

iTrader: (49)

The Melcos have been proven to make 5kv more over stock ls1 coils. If they were round, from an LQ9, they were Melcos. This was a test Harlan did years ago. I'd SERIOUSLY have to dig in my history to find it, but I asked the question a few years ago as well.

67rally

iTrader: (5)

No, they were not the round ones. No heat sinks. These are the triangular/square coils. They came with my LQ9 engine. The engine was a bone stock dropout when I got it.

67rally

iTrader: (5)

Anyone know what coil packs I can use with an LQ9 coil pack harness? Will the LS3's work? LS7?

Paul Bell

iTrader: (9)

All coils AFTER LS1/6 will work as the coil plugs are the later LS2 "style" versions.

LS7 coils are the same as LS3.

67rally

iTrader: (5)

Thanks. I thought so on both of those items. I almost went back and edited that post but figured someone else might benefit from my ignorance as well.

dr_whigham

iTrader: (49)

Yeah, that's the funny thing when GM swapped to a floating pin, they swapped coils also, and 2004 itself was a funny year for those trucks.

I had an 04 Escalade with an LQ9, and when going to buy plugs for it (MSD) there's actually 2 different ones available. One for the round Melcos and one for the square Delphis. Different length wires for each.

65rambler

So i have a 2006 truck 5.3 are those coils better than say a new LS-7 coil?

01ssreda4

iTrader: (96)

Do any coils swap to the fbody harness?

JakeFusion

iTrader: (7)

If I wanted the GM 10457730 (D585) coils (round truck with heatsink), I'd just need the 10457736 bracket and 12601824 coil harness right? Then it would plug into my loom?

miami993c297

iTrader: (6)

I just received all new parts in AC Delco original packages or GM OEM package:

AC Delco D-585 assembly



AC Delco D-585 Coil



AC Delco D-585 Connectors



AC Delco D-585 Harness 1



AC Delco D-585 Harness 2



12-10-2013 AC Delco D-585 and coil harnesses 12601824 assembled 1



12-10-2013 AC Delco D-585 and coil harnesses 12601824 assembled 2



12-10-2013 AC Delco D-585 and coil harnesses 12601824 assembled 3



12-10-2013 AC Delco D-585 and coil harnesses 12601824 assembled 4



Those parts plus shipping was $593.86.

12-11-2013 D-585 Mounted 1



12-11-2013 D-585 Mounted 2



12-11-2013 Firecore50 custom 1



12-11-2013 Firecore50 custom 2



12-11-2013 Firecore50 custom 3



12-11-2013 Firecore50 custom 4



Christian

The red monster

I have a ton of these coils and will definitely be looking into the swap now