Tram

iTrader: (14)

How necessary is it to change the tables?

I don't have a tuner of my own and have a pack dying.. Thinking about replacing all my packs to these...

LS1 BU

iTrader: (13)

I swaped to the d585 coils and left the stock dwell tables in the ecu. Motor seems more responsive and better throttle response. Don't know if it makes any more power.

MeentSS02

iTrader: (11)

If I remember, I'll try and post a screen shot of the differences between the LS1 and D585 coil dwell tables.

Tram

iTrader: (14)

I could probably get mine tuned out eventually, I need to lean it out a bit anyway but it might be a while..

NemeSS

iTrader: (127)

i put some on my truck just for the hell of it with no tune. the truck felt slightly more responsive and acceleration improved all over. nothing to be impressed about really, but i did notice a slight difference. maybe it will improve more with calibration.

Nemesis350

iTrader: (11)

i also put in the d585 coils without changes for the tune. i'm honestly not sure who much of a difference it has made AS IS, but it seems to run nicer But when i get dyno tuned i will probably have the dwell tables checked in case it helps any.

I do believe there is already a lengthy thread here with charts showing differences in the variety of coils that'll work with our cars, including aftermarket brands.

Tram

iTrader: (14)

Sweet.. I may pick some up and just replace all the packs...

Big_Bird_WS6

iTrader: (7)

what are the D585 coils off of?

NemeSS

iTrader: (127)

i have set fs

came on many yrs. suv and trucks. ive found em on 4.8s to lq4s.
some trucks came with the triangle shaped ones. and the d585s.

LS1-450

iTrader: (33)

I use 'em without changing the tables, as well. I have tuning software & decided to leave the tables alone 'cuz they work great, as is.

Big_Bird_WS6

iTrader: (7)

so how do i tell if it is a D585? is is just a truck coil?

MeentSS02

iTrader: (11)

http://www.megamanual.com/seq/coils.htm

https://ls1tech.com/forums/generatio...p-18-6-tq.html

https://ls1tech.com/forums/generatio...ke-sticky.html

Keep in mind that this is a very polarized issue - there are those that say this is a complete waste of time and money, and others that think they are worth it. If you have a coil pack going south, it might be worth looking into. There is no doubt that they are more powerful coils, but their necessity in this application remains to be seen.

FWIW, I run them on mine with a modded dwell table that doesn't match anything remotely close to the stock LS1 coil table OR the stock D585 table.

sjsingle1

iTrader: (1)

and why do you run a diff dwell table and what does it do for you?

Paint_It_Black

iTrader: (1)

yes they should have a different dwell. It's a longevity issue. You also need to replace the brackets.

SweetS10V8

iTrader: (4)

You should use the correct dwell table.

I have an D585 vehicles OEM tune file if you want the correct dwell table. Its in HPTuners format. Its posted here;

http://www.hptuners.com/forum/showthread.php?t=13159

MeentSS02

iTrader: (11)

It's like NOS...it's pretty much like running a 300 shot at all times.

Tram

iTrader: (14)

Ok, why do they need a different dwell table?

sjsingle1

iTrader: (1)

so how did you arrive at the dwell settings you run now? and how far are they from the truck settings?

MeentSS02

iTrader: (11)

You could go with the argument that GM's engineers set the dwell tables up for maximum longevity, and you'd probably have a pretty decent argument if that's what you chose to believe. The D585 and LS1 coil dwell tables are definitely different...see below.

I went off of that Megasquirt link I posted above where they found that the maximum dwell time for the D585 type of coil was around 5.0ms @ 14V - any more dwell didn't generate any more spark energy, so it would probably just heat up the coil (although they do have heat sinks, so they might handle it better). I just massaged the table for mine so that the maximum value was 5.5ms @ 12V, 5.0ms @ 14V, and so on (as seen in the table in that link I mentioned), and whatever it took to get there, I just added to the rest of the values all across that row. A little linear interpolation, and you get the randomness that is my current dwell table. It might be a little high on dwell in the upper RPMs, but I'm not sure...after all, I could ask it to charge for a lot longer, but it will only charge as long as it can before it has to fire under those conditions.

Stock LS1 coil dwell table:



Stock D585 coil dwell table:



And what I currently run:

sjsingle1

iTrader: (1)

<<< just got some truck coils and wondering if a tune would be helpful