red04ls1gto

GM is just weird. The ls2 coil (D514A) that they use on everything 07 and up costs a little over a buck more than the D585 coil.

06X6spdGTO

iTrader: (6)

has anyone done a resistance test on the D585 coils vs the stock LS1 coils?

99'CajunFirehawk157

iTrader: (57)

Maybe here ; http://www.megamanual.com/seq/coils.htm

cowboyup

iTrader: (4)

Hey guys... Very interesting thread..

Any gains going from LS2 Coil pack to Truck D585 pack?

or are they pretty much the same?

Thimble

iTrader: (2)

Dwell table is expressed in milliseconds.

In EFI-Live, the max is 100ms, which is still just 1/10th of a second.


Adding one full second to coil charge time before discharge is flat out impossible if you want your engine to run.

The Alchemist

iTrader: (19)

Sorry, I meant 1.0 added to the table, which happens to be in milliseconds.

My bad. Thanks for the correction/clarification.

JFM-jr

iTrader: (23)

Almost 5 months and 31 pages and still to date not a single back to back test done on this "upgrade" yet beyond the OP's findings?

jimmypop13

iTrader: (17)

This seems like a ridiculously expensive mod if you buy everything new for not that much of a gain.

dub.ya.es.SICK

iTrader: (3)

this is one long thread, not too good on the setup vs setup results tho

The Alchemist

iTrader: (19)

Look at the link above... Back to back dyno test done on a customers car.

JFM-jr

iTrader: (23)

For some guys looking to extract the last 10hp from their setups this is not unreasonable money if the results are there,solid,proven.

KRAZY K 2000 TA

iTrader: (5)

got mine today from junk yard fifty bucks and they are like new took them apart cleaned it armor all the wire loom and cleaned everything nice. $50

JFM-jr

iTrader: (23)

excellent!

02_camaroz28

iTrader: (20)

Ok im going to the junkyard right now. Do MSD wires HAVE to be ran with the coil upgrade? Or can u use the ones already on your car? Im sure this has already been answered I just cant find it in this thread since it blew up so much! Please dont yell at me thanks

jrob56

iTrader: (39)

is there a compiled list of trucks these came on, if so im going to the junkyard with a picture and making this happen! Would this mess with my tune and lean it out?

The Alchemist

iTrader: (19)

It shouldn't lean out your tune, but it will make for a more complete combustion, which is what yeilds more power.

JFM-jr

iTrader: (23)

More of a tuning question but it seems increasing dwell to 5 milliseconds in conjunction with these Yukon coils would yeild the most. Would increasing dwell time make the motor more prone to detonation?

Thimble

iTrader: (2)

Absolutely not. Not even related really. Increasing dwell time only amplifies the spark intensity.

The limit to increasing dwell is exceeded when the coils cook themselves to death. They do need cool-down time between the dwell (charge) and spark (discharge) cycles.

The Alchemist

iTrader: (19)

Dwell time is the amount of time the coil is being charged, in milliseconds. Re-watch the video to understand the the d585 coils can handle a higher charge, more dwell time, hence releases more energy when the coil is commanded to fire. Again if you try and charge the ls1 coils too long, they will just cook, which is the speculation of what's wrong with the msd coils.

Part of the reason the D585 coils are able to handle more dwell (charge) is because they have a heat sink to help them run cooler.

02_camaroz28

iTrader: (20)

Very well explained sir.