LS1 Coils on LT1 with standalone engine management.
12-29-2011, 02:09 PM
#1
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LS1 Coils on LT1 with standalone engine management. Hi, im planning to run my LT1 engine with DTA-fast standalone system.
I have replaced the optical sensor in the optispark with a triggerwheel from a audi a6 v6 and the sensor from a Volkswagem BMP diesel engine.
This means that i no longer have a distributor and have bought MSD LS1 coils and want to run them separatly, the only problem now is that i cannot find any information on how to wire them up properly.
does anyone know to wich connection i should attach wich wires and also how the coils are operated (charge-up time, 12volts, 5volts, ground or positive?)
i would like as much information as possible about this and im hoping that someone can give me the answers i need!
/Björn
PS: Im not stupid, im swedish so sorry if my grammar is a bit off
I have replaced the optical sensor in the optispark with a triggerwheel from a audi a6 v6 and the sensor from a Volkswagem BMP diesel engine.
This means that i no longer have a distributor and have bought MSD LS1 coils and want to run them separatly, the only problem now is that i cannot find any information on how to wire them up properly.
does anyone know to wich connection i should attach wich wires and also how the coils are operated (charge-up time, 12volts, 5volts, ground or positive?)
i would like as much information as possible about this and im hoping that someone can give me the answers i need!
/Björn
PS: Im not stupid, im swedish so sorry if my grammar is a bit off
12-29-2011, 03:17 PM
#3
On The Tree
Your grammar is a bit better than 90% of the people that post on here. Maybe we should all go to Sweden for our English lessons.
BTW, are all the women over there blond and beautiful?
Which FAST system are you using? I have several different wiring diagrams.
BTW, are all the women over there blond and beautiful?Which FAST system are you using? I have several different wiring diagrams.
12-30-2011, 10:08 AM
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Hehe, thanks 1963ss
I´m not using a FAST system but "DTA-Fast" (http://www.dtafast.co.uk/)
But really all i need is the specs on the coils and how to wire them.
Lethalbird: In sweden its not that easy to just pick up some truck coils.... the market on chevy v8 in sweden is quite small and those who have parts hold on them hard!
Not all women but alot of them! however i´ve spent a couple of weeks in LA as an exchange student and i cant say that i was´nt dissapointed of the women there either! 
I´m not using a FAST system but "DTA-Fast" (http://www.dtafast.co.uk/)
But really all i need is the specs on the coils and how to wire them.
Lethalbird: In sweden its not that easy to just pick up some truck coils.... the market on chevy v8 in sweden is quite small and those who have parts hold on them hard!
Not all women but alot of them! however i´ve spent a couple of weeks in LA as an exchange student and i cant say that i was´nt dissapointed of the women there either! 
12-30-2011, 10:45 AM
#7
On The Tree
If I understand correctly here is a pic of my coils on an LT1.
The wire on the left (pink) is 12 Volt power. Each 4 coils require a 20 amps fuse because they draw 15 amps when running.
The second wire from the left (Green) is the wire that gets grounded through your control box. It's the one that makes the coil fire.
The third wire (Black) the low voltage coil ground
The 4th wire from the left (Also Black) is the high voltage coil ground.
If your wiring diagram doesn't show a place for a ground on your control box plug then the third and fourth (black) wires can be put together and grounded to your head........or the car's head. Just as long as it's a good ground.
I'm assuming that the MSD coils have the same wiring as the stock LS1 coils so you could just plug them in.
The MSD coils are mounted with the plug on the side so the top wire would be the 12 volt power. Don't forget that you'll need a 20 amp fuse for each set of 4 coils.
the second wire down is the control wire to your box that fires the coils
The third and fourth wires down are grounds like mentioned above.
Kinds like this
The wire on the left (pink) is 12 Volt power. Each 4 coils require a 20 amps fuse because they draw 15 amps when running.
The second wire from the left (Green) is the wire that gets grounded through your control box. It's the one that makes the coil fire.
The third wire (Black) the low voltage coil ground
The 4th wire from the left (Also Black) is the high voltage coil ground.
If your wiring diagram doesn't show a place for a ground on your control box plug then the third and fourth (black) wires can be put together and grounded to your head........or the car's head. Just as long as it's a good ground.
I'm assuming that the MSD coils have the same wiring as the stock LS1 coils so you could just plug them in.
The MSD coils are mounted with the plug on the side so the top wire would be the 12 volt power. Don't forget that you'll need a 20 amp fuse for each set of 4 coils.
the second wire down is the control wire to your box that fires the coils
The third and fourth wires down are grounds like mentioned above.
Kinds like this
Last edited by 1963SS; 12-30-2011 at 10:56 AM.
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12-30-2011, 10:51 AM
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Great, exactly what i needed! but i think the engine heads have a better ground than mine!
Do you have any part number for the... eeh.. connectors?? (The plastic that the wires are stuffed into that plugs in to the connectors(?) on the coils?
Do you have any part number for the... eeh.. connectors?? (The plastic that the wires are stuffed into that plugs in to the connectors(?) on the coils?
12-30-2011, 11:08 AM
#9
On The Tree
I've got the numbers wrote down somewhere. Let me find them and get back to you. Why aren't you driving a Volvo?
Also,since you're using the DTA fast control don't forget that the coil numbers listed are the firing order and not the cylinder numbers. If our firing order is 1-8-4-3-6-5-7-2 then that would be coils 1-2-3-4-5-6-7-8. Geesh, that's kinda hard to explain.
If it's marked coil 1 on the diagram then it's the first cylinder to fire.
If it's marked coil 2 then it's the second cylinder to fire or #8
If it's marked coil 3 then it's the third cylinder firing or #4, etc.
EFI connection is the right answer. They are $14.50 each or 9.75 each if you order eight or more.
I have the GM part number as 12102754 but you may want to check. I think it's right.
?Also,since you're using the DTA fast control don't forget that the coil numbers listed are the firing order and not the cylinder numbers. If our firing order is 1-8-4-3-6-5-7-2 then that would be coils 1-2-3-4-5-6-7-8. Geesh, that's kinda hard to explain.
If it's marked coil 1 on the diagram then it's the first cylinder to fire.
If it's marked coil 2 then it's the second cylinder to fire or #8
If it's marked coil 3 then it's the third cylinder firing or #4, etc.
EFI connection is the right answer. They are $14.50 each or 9.75 each if you order eight or more.
I have the GM part number as 12102754 but you may want to check. I think it's right.
Last edited by 1963SS; 12-30-2011 at 11:28 AM.
12-30-2011, 11:54 AM
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Great! thanks guys, EFI connection... i suddenly understand alot more of everything ive been reading!
haha, im not that into volvo, my other cars are audis! (yeah i know) plus i work at an audi dealership so... but i´ve been told that we swedes sound like angry germans when we talk so maybe audi is the way to go after all!
And also, thanks gregrob but i think ill try and find the connectors somewhere "closer to home"
haha, im not that into volvo, my other cars are audis! (yeah i know) plus i work at an audi dealership so... but i´ve been told that we swedes sound like angry germans when we talk so maybe audi is the way to go after all!
And also, thanks gregrob but i think ill try and find the connectors somewhere "closer to home"
02-16-2012, 09:18 AM
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Update, the engine build came to a stop when i felt the need to pick up a 75 chevelle laguna s3 that needs a whole lot of work, however, since im home sick today i got to work on modifying the efi connectors (that i got from eficonnection.com, you where right after all "gregrob") i dont know if i ordered the wrong connectors or something but i had to cut a slot in them or they wouldnt fit!
i studied the wiring diagram for the DTA-fast system but are you guys shure that the second wire (green) is grounded through the control box, shouldnt it be a 5volt signal on that?
Thank you for all your help!
i studied the wiring diagram for the DTA-fast system but are you guys shure that the second wire (green) is grounded through the control box, shouldnt it be a 5volt signal on that?
Thank you for all your help!
02-16-2012, 11:00 AM
#13
On The Tree
Hey Berry.....I believe that the LS1 coils that you have need a ground for the trigger and the LS2 coils need a voltage. So either way is correct depending on what you have. In your first post you said that you bought LS1 coils so that's the info I gave you. As always, it may be prudent to double check but I think I'm right. Good luck. ---Gunny---
Good luck. ---Gunny---
02-16-2012, 11:20 AM
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i took a look at the "how to" for ls1 on megasquirts website (http://www.msextra.com/doc/ms3/ls1.html) and there it says "logic ignition signal & Signal ground" at their schematics.. thats what got me thinking!
and yes, i have ls1 coils
and yes, i have ls1 coils
02-16-2012, 12:06 PM
#15
On The Tree
I'm still pretty sure that the "logic signal" for the LS1 coils is a ground and the LS2 coils is voltage. I could be wrong but that would be the first time in my life........or not.
.......or not.
02-17-2012, 03:50 AM
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hmm. i´ve been reading a couple of threads about this and i´m getting more and more convinced that the coils use a 5v signal, especially since the 3:rd pin should be put at "signal ground". from ehat i´ve gathered, the 5 volt input supplies the ignintion control circuit built into the coil, that tells the coil to charge up, and when the power goes down the coil fires? i would appreciate if anyone with better "english tech skills" could read this: http://forums.hybridz.org/index.php/...-coil-testing/
As im having a bit of trouble understanding everything i read!
As im having a bit of trouble understanding everything i read!
02-18-2012, 04:47 AM
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I´ve got my answer! The trigger signal is 5v "falling current" it charges up the coil when it gets 5 volts and when the voltage drops to 0v it fires the coil (Dwell time).
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