LSx coil thread - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 01-20-2015, 02:12 AM   #1
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,271
Total Cats: 32
Default LSx coil thread

OK ladies,

It's time for a thread consolidating all this stuff.

There are a few variants of LSx coils, bbundy has posted pics and part numbers here.

GM#12573190 ACDelco D514A LS2/LS7 Corvette:



GM#10457730 ACDelco D585 LS2 Truck:



GM#12611424 ACDelco D510C LS?:



GM#12558948 ACDelco D580 LS1/LS6:



The general consensus says the LSx truck coil (D585) is the best, followed by the non-truck LS2/LS3 coil (D510C, D514A), then the LS1 coil (D580). I'm sure this isn't an exhaustive list of all LSx coils but these are the common ones people are running.

If you want to use the FM bracket, you'll probably want the D510C.

They are all much beefier than our OE coils or the Toyota coils.

Mounting

You can buy the D510C LS2 mounting bracket from Flyin' Miata for $44.95, part # 26-04320. The part # for the Magnecor 5mm leads is 26-04075. These parts suit 1994-2000 cars (non-VVT). You can buy additional parts from Flyin' Miata to replace the VVT hard line to let you run this bracket on a VVT engine.

The instructions for their full kit can be found here:
http://www.flyinmiata.com/support/in...ra%20coils.pdf

Keep in mind that the FM mounting bracket won't work with the EGR pipe in place, and may get in the way of coolant reroutes.

Wiring

If you are retaining all the factory wiring you will need to wire these as wasted spark:

A - grounded on engine

B - existing ground wire on coil connector loom
C - existing trigger wire on coil connector loom (trigger wire on coil connector 1 goes to both 1/4 GM coils, trigger wire on coil connector 2 goes to both 2/3 GM coils)
D - existing +12v wire on coil connector loom

These coils don't provide a tach output.

Here is a wiring diagram from swimming108:



Here is a schematic from Megasquirt Sequencer Coils:



Dwell settings and optional capacitors

Taken from Megasquirt Sequencer Coils:

Quote:
The maximum dwell should be set at 4.5 milliseconds - going longer does not generate any more spark energy.
Quote:
The two capacitors are optional but recommended. The 1.0 F capacitor on the +12V is helpful, it is similar to the one used on EDIS. What it does is provide brief energy storage for the discharge. The other capacitor will help eliminate back-fed noise to the MegaSquirt controller. Use a 100 pF to 0.001 F cap on the TTL trigger input wire to ground. What this does is shunt extremely fast noise spikes to ground and not let them feed back to the MegaSquirt processor. The added capacitance is minimal - with the series resistance of 1,000 ohms (in the controller) and a 100 pF capacitor the RC 3dB time constant is 2πR C = 0.6 microseconds.
Disclaimer

None of this is my work, I've just brought together useful things found on this site. I haven't tested anything above first hand but have tried to verify everything from at least two sources.

Please post the type of coil you are running and how you have things mounted and wired!

Cheers
Attached Thumbnails
LSx coil thread-ls1_coil_schematic.gif   LSx coil thread-74940d1367019611-ls2-coil-install-wasted-spark-coil-wiring.jpg   LSx coil thread-20981d1307050606-my-ls2-coil-installation-ls2.jpg   LSx coil thread-20982d1307050606-my-ls2-coil-installation-25358_41479.jpg   LSx coil thread-20983d1307050606-my-ls2-coil-installation-getimage.jpg  

LSx coil thread-20984d1307050606-my-ls2-coil-installation-nal-12558948_w.jpg  
timk is offline   Reply With Quote
Old 01-20-2015, 02:24 AM   #2
Junior Member
iTrader: (1)
 
Join Date: Feb 2013
Location: Windsor, Ontario
Posts: 403
Total Cats: 64
Default

A+ post especially since I was just looking into LS coils more in depth for my build as it comes closer to putting things together. Props given
BoostedSmurf is offline   Reply With Quote
Old 01-20-2015, 02:26 AM   #3
Elite Member
iTrader: (6)
 
TorqueZombie's Avatar
 
Join Date: May 2011
Location: Lebanon, TN
Posts: 1,643
Total Cats: 62
Default

Here is my wiring for the D514A
Attached Thumbnails
LSx coil thread-ignition%252bwiring%252bjpeg.jpg  
TorqueZombie is offline   Reply With Quote
Old 01-20-2015, 08:46 AM   #4
Supporting Vendor
iTrader: (6)
 
Join Date: Mar 2005
Location: Broken Arrow,Ok
Posts: 950
Total Cats: 20
Default

Thanks for gathering this information into one thread.

Something to amend is that the FM bracket does not work with all the different coils shapes. They designed their bracket for the thin rectangular coil (looks to be the LS7 version). I had my suspicions and Curly now has his bracket for sale in the classifieds because his round truck coils don't fit.
TheBandit is offline   Reply With Quote
Old 01-20-2015, 05:30 PM   #5
Junior Member
iTrader: (6)
 
Join Date: Sep 2013
Location: Houston, TX
Posts: 143
Total Cats: 1
Default

Great info. Another tidbit to add would be how to get the tachometer back since the coils don't have a tach output.
mrmonk7663 is offline   Reply With Quote
Old 01-20-2015, 05:48 PM   #6
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,719
Total Cats: 471
Default

Yup, FM's bracket only works with the D510C coils. Seen here:



The issue with the D514A coils and FM's bracket can be seen here:



There's a chance it could fit with some longer spacers, and some clever custom work. I might dick around with the MSM engine sitting in my garage, but it's definitely not going to work off the (FM's) shelf.

I bought 8 D514A coils and 8 wiring pigtails all off ebay for a total of $136.93, or $68.47 per 4 cylinder engine. Previously on Blaen99's engine, I made temporary mounts seen here:

http://www.miataturbo.net/attachment...ine=1417391883

This was using the popular $75 NGK spark plug wire kit for 90-97 miatas, not FMs. I'm mocking up the same setup on my own car with the bigger red Magnacores. I'll let you know how that works soon.

For brackets, I'll be using a custom Singular Motorsports bracket, kindly designed to my specifications by ThePass. I'll have a few sets soon, one for myself, one for Blaen99, and another for the other 4 coils/pigtails I have. They'll be for sale soon. And I think he plans on selling them through Goodwin after I get a few prototype sets. But the should be compatible with 1.6, NA1.8, NB1, NB2, and MSM valve covers.
Attached Thumbnails
LSx coil thread-04-59100.jpg   LSx coil thread-4a4b8f6e-9461-42dc-8f79-dd98a7b55fd9_zpsgu6o7er6.jpg  
curly is offline   Reply With Quote
Old 01-20-2015, 07:30 PM   #7
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 15,253
Total Cats: 985
Default

What boost level are these necessary over Toyotas if at all? Curly did you have issues with the Toyota COPS you had or are you switching for the bling factor.
aidandj is offline   Reply With Quote
Old 01-20-2015, 07:43 PM   #8
Senior Member
Thread Starter
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,271
Total Cats: 32
Default

I can only assume that all the coils share the same connector?
Home Shop Connectors / Harnesses Delphi / Packard Pigtails GM Delphi / Packard - 4 way GT 150 3.5mm Centerline male connector Pigtail for some GM truck ignition coils (index keyway)



I think the LS1 coil gets plugged in upside down compared the other coils, no difference in wiring just spin the plug 180 degrees.

Can anyone confirm?
timk is offline   Reply With Quote
Old 01-20-2015, 09:50 PM   #9
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,719
Total Cats: 471
Default

I believe they are all the same, yes. Same as the ones that fit my coils pictured above.
curly is offline   Reply With Quote
Old 01-20-2015, 11:04 PM   #10
Supporting Vendor
iTrader: (6)
 
Join Date: Mar 2005
Location: Broken Arrow,Ok
Posts: 950
Total Cats: 20
Default

Curly,

Would you mind sharing your design idea?

I'm working with VVT and have no plans to castrate the oil lines. I'm currently eyeing the driver side of the back of the head.
TheBandit is offline   Reply With Quote
Old 01-20-2015, 11:21 PM   #11
Junior Member
 
Join Date: Dec 2009
Location: Brisbane, AUSTRALIA
Posts: 380
Total Cats: 30
Default

Quote:
Originally Posted by curly View Post
:
The issue with the D514A coils and FM's bracket can be seen here:


There's a chance it could fit with some longer spacers, and some clever custom work. I might dick around with the MSM engine sitting in my garage, but it's definitely not going to work off the (FM's) shelf.
:
Just buy some threaded rod that fits through the holes and a length of aluminium tubing that slides over it and can be cut to the required spacing lengths. You'll probably have to re-make one of the L-brackets too to allow the base to bolt into place (or both if you're A N A L like me and want it centred properly).
Lokiel is offline   Reply With Quote
Old 01-20-2015, 11:34 PM   #12
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,719
Total Cats: 471
Default

Tried that today. You can't run them with the wire plug and harness plug on the inside, they'd have to be waaaay over towards the intake side. In order for it to work, it'll look like this:



And sticks this far out from the head:



Don't think we have that kinda room before the firewall.
Attached Thumbnails
LSx coil thread-4c18393d-b12a-42e6-95e7-6a72d975bec5_zpst06x24ck.jpg  
curly is offline   Reply With Quote
Old 01-20-2015, 11:39 PM   #13
Junior Member
 
Join Date: Dec 2009
Location: Brisbane, AUSTRALIA
Posts: 380
Total Cats: 30
Default

Is there enough room to mount them on top of the rocker cover, using the manifold bolts to mount the brackets to?
Lokiel is offline   Reply With Quote
Old 01-20-2015, 11:46 PM   #14
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,719
Total Cats: 471
Default

Man, why didn't I think of that?!?

DIY LS/GM coil mounting on VVT

It might be the basis of the Singular Motorsport kit.
curly is offline   Reply With Quote
Old 01-20-2015, 11:50 PM   #15
Elite Member
iTrader: (8)
 
Ryan_G's Avatar
 
Join Date: Jan 2012
Location: Tampa, Florida
Posts: 2,294
Total Cats: 123
Default

Why not just mount them on top of the valve cover using the same four holes that the stock cops use for 01+? I have seen this done before and it is super simple. No special bracket required. You just need a bolt and some nuts.
Ryan_G is offline   Reply With Quote
Old 01-21-2015, 12:50 AM   #16
Junior Member
 
Join Date: Dec 2009
Location: Brisbane, AUSTRALIA
Posts: 380
Total Cats: 30
Default

Quote:
Originally Posted by curly View Post
Man, why didn't I think of that?!?

DIY LS/GM coil mounting on VVT
:
WooHoo - confirmation that I'm not so old that I've lost my visual-spatial ability!
Lokiel is offline   Reply With Quote
Old 01-21-2015, 02:51 AM   #17
Cpt. Slow
iTrader: (24)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 11,719
Total Cats: 471
Default

Quote:
Originally Posted by Ryan_G View Post
Why not just mount them on top of the valve cover using the same four holes that the stock cops use for 01+? I have seen this done before and it is super simple. No special bracket required. You just need a bolt and some nuts.
Is that compatible with 90-05 and does it work with common NA NGK wires?
curly is offline   Reply With Quote
Old 01-21-2015, 04:44 AM   #18
Senior Member
iTrader: (1)
 
Join Date: Jan 2011
Location: Chattanooga, Tn
Posts: 986
Total Cats: 115
Default

Here's how I mounted mine. Nothing fancy.





Attached Thumbnails
LSx coil thread-10464344_10152491701024242_105033894190403183_n_zps6688db1d.jpg   LSx coil thread-10357116_10152491700989242_1192878318126238981_n_zpsdf674bd5.jpg   LSx coil thread-10474894_10152508782909242_8938562830023879809_n_zps6c45cb74.jpg  
TNTUBA is offline   Reply With Quote
Old 01-21-2015, 08:11 AM   #19
Moderator
iTrader: (9)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, FL
Posts: 13,733
Total Cats: 1,062
Default

This is mine before re-doing the plug wires:



Bracket courtesy of HHammerly. Coils are the Delco units from the "flex fuel" trucks. Mitsubishi coils were much easier to find but don't supposedly make as much power and bolt up differently.
sixshooter is offline   Reply With Quote
Old 01-21-2015, 02:47 PM   #20
Junior Member
 
Join Date: Dec 2013
Location: Little Rock, Ar
Posts: 107
Total Cats: 24
Default

Here is how I mounted mine. D585 LS2 truck coils wired in sequential and being run by a DIYPnP. The wires are from a 2004 corvette and work great. I designed the bracket in SketchUp and cut it out on a laser cutter at work out of stainless steel. I may redo it in the future but for now it works great. It is held on by the 3 middle bolts of the valve cover.





Attached Thumbnails
LSx coil thread-986c97ec-2cbf-4229-bf5d-b223e6450a1b.jpg   LSx coil thread-fb142c5a-3128-434f-9ba8-401f396abc43.jpg  
92turbomiata is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 07:21 PM.