LS1/2 Coils (Information)
 

I've noticed the lack of information on the LS/2 type coils and thought I would try and put as much information in one place as possible on these coils.

The two different types of coils and their wiring.
http://www.megamanual.com/seq/coils.htm

Testing of the coils and dwell
http://forums.hybridz.org/showthread.php?t=120533

Spark Plug boots and terminal part numbers (MSD) that are available at Summit
LT1 Straight (Boots and Terminals 2/card) - PN 3302
LT1 90 Deg (Boots and Terminals 2/card) - PN 3303
LT1 45 Deg (Boots and Terminals 2/card) - PN 3304

Spark Plug Wire Sets (pre-made)
99 Suburban
Harley
https://www.rx7club.com/showthread.p...1+coils+harley

Aftermarket Versions
MSD
http://www.msdignition.com/coil_blaster_19_8245.htm
Accel (Truck Version)
http://www.accel-ignition.com/Produc...minselection=1

I set these up on my car, I found a wiring diagram on this site and I spoke to a technician at MSD (I have the MSD upgrade LSx coils), and was given charge and dwell time.

I'll post some info when I get it off the haltech

I received a response from an MSD Tech that the MSD LS-1/2 coils actually don't stop multispark until 5-6000 rpm which worried me about their use with FI. I guess it depends on the total angle it multisparks but I wouldn't want the leading to end up behind the trailing at heavy load. I guess I like the simplicity of the truck coils and their mounting. The heat sink should also help based off a couple of articles I have seen they seem to be the best choice. I may try the Accels if I find the stock truck coils don't provide enough power. I'm also wondering if some of the reasons some have had issues with these coils is based around how they wired and setup the ignition signals.

Using a set of LS1's on a 13B with E11v2 making 425hp at about 24psi (on a not so good motor) they seem to work just fine with a charge time of about 5mS.

Haltech has had them on the bench with a charge time of about 6mS but of course, the bench is no substitute for being on an engine, but still, the coils work well.

I kind of question whether the people that have had issues with these coils did not have them setup right. I know some are not hooking up the ecu ground and others that may not have known the differences in triggering on the two different coils that might have burned them out or caused issues. Based on how far some of the piston guys have pushed these coils it makes me wonder why they can't be pushed fairly far on our engines ~500 hp.

I honestly dont doubt that they can be pushed further. If you think about it this way, V8 guys have them installed on 1000hp cars, now thats roughtly 125hp per cylinder, if you take into account that we have 2 coils per rotor, does this mean that we can pretty much run at least 500hp from them with no problems.

As i said before, i've installed and tune them personally on a 13B pushing 24psi of boost making 425hp, and this engine wasnt in that great a shape. And they didnt bat a lash. And these were the regular GM LS1 coils, the black ones, OEM Part.

425 to the wheels is about 500 to the motor. I am guessing we should definitely be able to push them further.

MSD LSX coil info from a MSD Tech

The unit multi-sparks above 2000 all the way up to 6000 RPM. The spark
starts to drop off in power at 6000 RPM so the coils switch over to a
single spark over 6000 RPM

Update!
Street Drama, the little Miata in Curaçao that i initially tuned with E11v2 on a 13B motor with LS1 coils, that was originally making 425hp @ 24psi (not so good motor), has been retuned with a new motor and is now making over 520hp using Methanol, no intercooler, and still using the straight OEM black LS1 coils as before with ZERO! issues or hickups. Here's a link to a video of the car's current state, its now white, not green like it was before. http://www.youtube.com/watch?v=FwB5G...eature=related

Lookis like they are pretty tough little coils after all, i will try to report back if i hear of anybody making good power on these coils.

I got my 7 started this morning with the LS-1 (truck varient) coils. They run very nicely. Spark output wise they hit louder than my stock ignition did a while back. I will see how much I can push them here in the coming weeks. I would still suggest the truck version of the coils over the others as its has the heatsink and based on the megasquirt site are more powerful than the standard versions. My settings are below.

DirectFire
Falling Edge
Constant Charge
5.5 MS Charge (dwell)

Wasted Spark (suggestions)
3 MS Charge

Hey Ryan, is this with the FD running E85?

Yeah she's on E85 now.


One thing I've noticed that I wondered if others had. These coils don't seem to like non-resistor style plugs. When trying to use them they seem to either not spark or intermittently spark. Changing them out they fire fine? Any thoughts on why?

I used the LS2 coils (middle one pictured in the HybridZ link) and kept melting them, literally melting them, when used on my 20B. We could only get a couple of dyno pulls at a time before the coil overheated somehow and stopped working.

This was using an E11v2 wired as shown above (ie. correctly).

Hows the tech leads on those things. im runing the truck coils as well, and my stock tech is way off. is thier any other way to fix that then getting a MONSTER tech?
sorry for the swift change of pace.

Why not use the tach (PWM) ouput on your ecu to drive the tach?

Are the settings above for GM part # 10457730? The coils on the right here?

http://www.bgsoflex.com/lscoil/ls2coiltest10.jpg

That's what I'm using with the truck coils which are the ones on the right.

Cool, just picked up 4 of these to try out with an E8 on a bridgeport 13B-RE...hopefully I have better results than with the non-truck LS2 coils on my 20B!

The ones on the Left is what haltech normally has in stock. I have had great results with these.

http://www.bgsoflex.com/lscoil/ls2coiltest10.jpg

Charge time on them can be as high as 5.5mS which is great spark in direct fire mode, they just dont seem to quit. However, i would love to see someone post about really high boost and high horsepower applications using these coils and what happens above 600WHP and 30+psi.

Anybody try the MSD replacement ones?

https://static.summitracing.com/glob...e/msd-8245.jpg

I bought 4 of the MSD replacement to run with my E6X. In the process of installing, so no results yet. They do look really nice though :)

Any worry about running multispark coils on the secondaries? A misfire on the leading could be catastrophic. Also these coils don't stop multisparking until 6000 rpm, which I'm assuming is sequentially based on the LS-1 engine???

here are the LSx coils I am running, They look different then the ones posted above. I beleive they are a variation of the truck coil...

they seems to be working pretty well with my E11v2 direct fire @ 4.5mS on a 20b N/A... I purchased a set of Taylor '409' Pro Race Wires (10.4mm) on sale for a V6 engine and trimmed them to length... Taylor also sells the "ls" coil terminal ends which i crimped on myself

Fritts- you raise an interesting concern. I have read where people have used the MSD on the leading with no problems.

Do you have any information on the msd multi spark dwell time as it relates to RPM- assume is it static from 2k to 6k? Below 6k, I would think some of this risk could be mitigated by running a more conservative split?

As for the secondary coils, I do have larger concerns running the MSDs. Will probably err on the safer side, and run stock ls1 for now.

**Subscribed**

The msd 6a units and most of the other units stop multisparking at 3k with the ls-1 coils it stops at 6k (msd tech). I always wondered if the transitional knock I saw with the MSD and PFC around 3k was from this but never proved it out. I would suggest the msds on the leading but standard coils on the trailing. I don't know for what angle the msd coils spark through so maybe its not an issue.

Just as a side note, having gathered a little information about MSD DIS units, (dont know if this would be possible to do on 6A units), from some MSD techs and people with DIS units, they often recommend to run their units in Constant Charge, Rising Edge, and NO MORE THAN 2mS of charge time, since they supposedly misfire with anything higher than that at high RPMs. Another detail, and this would apply to the 6A units, is that they are set to Constant Duty, Rising Edge, and from what i have talked to a few people about but have not been able to test my self is that the ideal Constant Duty Period is 40%, i have been told that lower looses power, and higher also looses power and causes spark brake up.

Just some information i'd share since we're talking about MSDs and Coils and spark.

It's all application dependant. I've made the most power running 20-30% and that was on a methanol NA application.