LS1 coil conversion
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LS1 coil conversion

  1. #1
    Highaboosta Unchained's Avatar
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    Default LS1 coil conversion



    I had a couple ignition issues last season that brought up the disadvantages of the distributor ignition system I've been running for years. One happened when the motor ran rough and it turned out the center button on the bottom of the dist cap was burnt off. The rotor was blue and it was apparent that there was current loss that had gone on for a while. That and the usual signs of arcing at the end of the rotor show more current loss.
    Then I had a small amount of misfiring at 20# turbo boost and 7000 rpm that pointed to that the ignition system didn't have the balls to fire a .035 plug gap at that rpm.

    I decided to make the switch to individual coils.
    I figured out that the coil charge time is .002 sec. for one coil to fire 4 plugs per revolution at 7000 rpm and can see the advantages of COP which multiplies that time by 8. Whenever the charge time gets below 5 ms the output is decreased.

    Here's some interesting reading about it,
    http://www.megamanual.com/seq/coils.htm

    I am going to use a FAST XIM ignition box to fire the coils.
    http://www.compperformancegroupstore...y_Code=XFI_IGN

    The LS1 coils have built in ignitors so all it takes is a 5 v signal to fire them.
    I got the coils used for $ 100.00 A whole new set on ebay is $ 150. They've run these coils for over 10 years on passenger cars.
    They have a GM factory 4 into 1 harness that connects them.
    Guys on yellowbullet stated that they have run these coils on drag cars with 2000 hp.
    Evidently these coils are pretty durable too,
    http://www.ls1tech.com/forums/genera...kill-coil.html
    I used all my old plug wires and have new terminals coming for the LS1 coils.
    This will be the cleanest looking ignition system I've ever run. No more 45" long floppy wires. Now the longest plug wire will be 7"
    You won't be able to see them in the boat.
    Last edited by Unchained; 02-06-2009 at 04:32 PM.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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  3. #2
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    That's going to be a very clean upgrade. Very interesting to hear about the performance difference up at the higher rpm's.



    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

  4. #3
    21 Daytona Outlaw's Avatar
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    Very nice Mark
    #55

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  6. #4
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    XIM™ Kit with Harness
    Code: XMWHARN
    Price: $687.44



    Ooouch gona be an expensive swap

    Would love to hear the results too

  7. #5
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    Watch out for 'burned center posts' inside the spark plugs under heavy use. It will start as a 'random misfire', then progress to an all out "dead hole". You will remove the spark plug for inspection and SEE NO PROBLEMS, but when you SHAKE the plug it will RATTLE. It is burned internally. "Long runs with slight (lean under loads) tune up problems" will cause these spark plug failures.

  8. #6
    Senior Member Hass828's Avatar
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    That looks killer mounted down low like that Mark, most guys mount them on the valve cover , I think it looks like hell. Good job. hope it works as good as it looks.

  9. #7
    LP-25.com Infomaniac's Avatar
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    Just think how cool 8 of those old school yellow Accel coils would look. lol

    Honestly I'm curious how well a capacitor at each coil would help now that there is more time for coil soak.

  10. #8
    "The" masheenist wsuwrhr's Avatar
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    I made a cool coil bracket for someone doing the same thing for a V-6 recently.

    I'll see if I can get some pictures.
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  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    sweeeeeet mark, let me know brother if ya need any more ls type coils, i've got dozens layin around i've pulled off wrecking yard motors that i've put in got a ls harness down in the barn if ya need it, has the weatherpack style connectors for your coils

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  12. #10
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by DMOORE View Post
    That's going to be a very clean upgrade. Very interesting to hear about the performance difference up at the higher rpm's.



    Darrell.
    no such thing as spark scatter with this style of ignition i think its tits

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  13. #11
    Highaboosta Unchained's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    sweeeeeet mark, let me know brother if ya need any more ls type coils, i've got dozens layin around i've pulled off wrecking yard motors that i've put in got a ls harness down in the barn if ya need it, has the weatherpack style connectors for your coils
    Hell yes !!!!
    I'll take a set of 8 LS2 coils with the 4 into 1 harnesses that connect them together. They look a little different than the LS1's.
    The middle one in the pic is an LS2 coil,


    I've been studying up on the schematic off the FAST site.
    I'm going to make my own XIM harness. It's a lot of work but looks the neatest and I'm a glutton for punishment.
    It will save some money over buying a completed harness too.
    http://www.fuelairspark.com/Instructions/FAST4_104.html

    Speaking of spark scatter, a friend and I were discussing cars we had back in high school in the early 70's. When you opened the hood at night after driving through the rain it was like a light show.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  14. #12
    mo balls than $cents$ IMPATIENT 1's Avatar
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    i'll look tommorrow and see what type they are. all of them came offa truck motors the customers would bring in from junk yards. i always pull off all the sensors and crap and reuse the stuff on the motor i pulled out, at least i knew they were workign kinda deal the 1's i have are on the lil 4 coil bracket and i think they still have the 4 to 1 harness on them, i know for a fact i have the 2 big connectors that plugs into the bank of coils. you want that whole harness or for me to cut off the coil wiring part? i'm not gonna use it man, i just keep em for the connectors, use them on boats since everything underhood on gm has weatherpack style connetors.
    i can also look up and give you the connector terminal indentification so you know what wire is what on the connector. it shows a pic of the connector, then shows what each pin circuit is.
    Last edited by IMPATIENT 1; 02-08-2009 at 12:39 PM.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  15. #13
    Highaboosta Unchained's Avatar
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    Tom,
    If you have the LS2 truck coils those would be good too.
    They have a heat sink on them and are a little different mount than the car coils. The truck coils are the ones on the right side of the pic I posted.
    The 4 into 1 harness would be good too. I won't need any more harness than what connects the coils together.
    I have a schematic for all the coils from the megasquirt site.

    Thanks

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  16. #14
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    Quote Originally Posted by IMPATIENT 1 View Post
    no such thing as spark scatter with this style of ignition i think its tits

    Agreed. I've got a short star v6 in my off road car, it has the coil on plug and the coins are actually oil cooled by the engine oil.


    Darrell.
    San Diego.

    28ft Sportcat
    With Twins

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