SR to LS2 coilpack help

[ultimateirving]

EDIT: moving this information to page one,

Ok so i found out that the e pins do not wire straight accross to the I pins on my ignitor wiring. I took the chopped plugs and matched wire color to wire color. Ill post a chart with my finding hopefully help future noobs.


SO using this gentleman's wiring pinout, I am going to wire in a relay to provide 12v directly from the alternator. Then I made sure to match all my wires to each coil pack. Going off of the wire color



and then wired the ignitor delete as such.


Fresh edit(09/25/2016) Went back and did some repairs to my wiring harness and I also corrected a mistake i made in the wiring, If you wire the ignitor like i did, then make sure to match the Coilpack harness to the picture below. Somewhere the wires must cross and i did not account for it in my original diagram.

This is a picture as though you were staring into the plug looking at the pins.

Using stock dwell settings on my rom tuned sr ecu to putter around, but for full boost you need to increase and adjsut the dwell.

I finally got it running and it sounds cherry. Time to drive!

Thanks to everyone for contributing..




I need some help with the wiring. My first attempt to install my LS2 coils were not successful but I fear its due to my error. The diagrams I have found on various google searches/forums are all outdated or deleted. I have constructed a harness using an existing SR coilpack harness .
I need some guidance with the wiring and have two basic questions.
What do I need to do with this ground?



And the LS2 coil pack harness has 2 ground wires, can I just ground one wire to the chassis and other to the engine?

Thank you.

[ultimateirving]

If anyone has done this and can chime I would appreciate. All the threads I've read don't provide what I need

[slow92]

Check this out, it might help you.
Ls1 coils onto your sr20

I have this conversion on my car but I did it so long ago that I can't remember how I wired everything up. Plus I have a haltech and at the time I got the wiring diagram and instructions from haltech's website.

[ultimateirving]

LS2 Truck Coil Pack Swap for S2 RB25DET « Rad! 240sx
found this just now with some different search terms

Gonna see if this helps and ill read urs too slow92.. thanks!

[ultimateirving]

Originally Posted by slow92

Check this out, it might help you.
Ls1 coils onto your sr20

I have this conversion on my car but I did it so long ago that I can't remember how I wired everything up. Plus I have a haltech and at the time I got the wiring diagram and instructions from haltech's website.

According to this write up the brown wire coming from the ls2 coilpack plug is a reference wire.
To what does these wires connect is my question??

[Black240Ct]

I've grounded both ls grounds to the chassis. Different spots

Then the four signals from the ecu to the respective coils

[ultimateirving]

Originally Posted by Black240Ct

I've grounded both ls grounds to the chassis. Different spots

Then the four signals from the ecu to the respective coils

Going to try basically this^^

I found a spare SR coilpack subharness i didnt realize i had(ty magic workbench) and so i cut the plug and rewired my harness to the SR plug.
Gonna test it out soon.

[slow92]

I think I bypassed my original sr coilpack harness and wired each individual ls1 coil to each individual sr20 coilpack signal wire per cylinder. I think I wired one of the grounds from the ls1 coilpack harness to the original coilpack harness grounds and the other one I grounded to the chasis or motor. It is pretty straight forward and everything is wired directly into the engine harness. Everything worked flawlessly. In fact I was having spark issues when my sr was making 400whp at the upper rev limit but since the swap I had noticed a significant difference in the vehicle's acceleration across the power band.

[ultimateirving]

Originally Posted by slow92

I think I bypassed my original sr coilpack harness and wired each individual ls1 coil to each individual sr20 coilpack signal wire per cylinder. I think I wired one of the grounds from the ls1 coilpack harness to the original coilpack harness grounds and the other one I grounded to the chasis or motor. It is pretty straight forward and everything is wired directly into the engine harness. Everything worked flawlessly. In fact I was having spark issues when my sr was making 400whp at the upper rev limit but since the swap I had noticed a significant difference in the vehicle's acceleration across the power band.

Thank you for the input! I'm still battling my install which I never thought I had the issues I am.

Can you tell me What gap are you running? And which plugs. I just bought new ngk bkr7e and gapped at .030 I plan to test later today. Will report back any updates

[slow92]

I had just ran the standard recommended gap. I didn't have any problems with spark blow out or anything like that with the ls1 coils.

[ultimateirving]

So all plug wires resistance tested about the same I feel they are ok

I did have my wife crank the ign with the lights out and saw little sparks everywhere but from the spark plugs.
New question: does anyone know if the coilpack itself has to
Be grounded to anything?
For Example the two mounting holes have metal bushings as the liner. ( as seen here. Top right coil http://m.ls1tech.com/forums/showthread.php?t=1476055 )

[blessedhellrider]

i do not believe a "truck ls2 " exist ...trucks are lm7"5.3"-,lq9"6.0"-,lr4"4.8" from what i know ..tell me if im wrong here.

i do know the truck coils have a different plug tho.

[VegasDrifterS13]

Originally Posted by blessedhellrider

i do not believe a "truck ls2 " exist ...trucks are lm7"5.3"-,lq9"6.0"-,lr4"4.8" from what i know ..tell me if im wrong here.

i do know the truck coils have a different plug tho.

LY6 is an Aluminum 6.0 Truck motor. L33 is an aluminum 5.3 truck motor. L92 is an Aluminum 6.2 truck motor.

ONLY LS2 in a "truck" is in the Silverado SS, and Trailblazer SS.

All 1999-2006 truck coils should be the same.

And the harnesses are different from truck Vs car.

Sent from my SGH-T989 using Tapatalk 2

[ultimateirving]

It's the same coil. I use ls2 for reference as people
Can relate. It's a 4 wire coil with a built in heat sink. The wiring is pretty straightforward

[VegasDrifterS13]

Originally Posted by ultimateirving

It's the same coil. I use ls2 for reference as people
Can relate. It's a 4 wire coil with a built in heat sink. The wiring is pretty straightforward

Yes. Any Gen 3 or gen 4 coil on any truck or car is the same. 1997-2006 model year cars and 1999-2006 trucks. The 06-08 cars and truck coils are different and 08-12 are different.

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[AsleepAltima]

I fixed the missing link on the sr20 forum. I didn't realize that it was gone.

I used Iridiums on my setup, gapped to .029 I believe. BKR 7's.

If I remember correctly, I may not have hooked the brown wire up to anything...

[ultimateirving]

Props to asleepAltima for fixing the link on Ls1 coils onto your sr20

I think I confirmed my issue and the wiring order was off on 2 cyl.

[VegasDrifterS13]

Is this swap done for any Voltage increase or just parts availability? I know the LS coils are 50,000V. What are the Sr20's ?

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[ultimateirving]

Originally Posted by VegasDrifterS13

Is this swap done for any Voltage increase or just parts availability? I know the LS coils are 50,000V. What are the Sr20's ?

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Stronger spark with high boost and they are pretty easy 2 source. Sr ones can be tough to find on short notice

[VegasDrifterS13]

Originally Posted by ultimateirving

Stronger spark with high boost and they are pretty easy 2 source. Sr ones can be tough to find on short notice

So you fab a bracket and run spark plug wires then huh?

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[slow92]

Plus you get a coil pack per cylinder instead of one coil pack for all four.

[VegasDrifterS13]

Originally Posted by slow92

Plus you get a coil pack per cylinder instead of one coil pack for all four.

? SR20'S HAVE INDIVIDUAL PACKS I THOUGHT ? OR WHAT THE HELL ARE THOSE ON TOP OF MY PLUGS ?

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[VATOCLOWN]

as far as the ground on the sr harness i just cut and taped it up and used the coil pack grounds and just did one to the head and the other to the chassis

[slow92]

Originally Posted by VegasDrifterS13

? SR20'S HAVE INDIVIDUAL PACKS I THOUGHT ? OR WHAT THE HELL ARE THOSE ON TOP OF MY PLUGS ?

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Sorry I meant one igniter per cylinder. Thanks for correcting me.

[VegasDrifterS13]

Originally Posted by slow92

Sorry I meant one igniter per cylinder. Thanks for correcting me.

No worries. Sounds straightforward. I might do this since I run 16psi. You guys are gettin better acceleration results due to a better ignition/ more thorough burn FYI. This is why Old school Hot rods Benefit Majorly when MSD or similar Ign systems are Installed. I never even searched for better coils for my SR. :sly: shame on me.

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[ultimateirving]

Originally Posted by VegasDrifterS13

No worries. Sounds straightforward. I might do this since I run 16psi. You guys are gettin better acceleration results due to a better ignition/ more thorough burn FYI. This is why Old school Hot rods Benefit Majorly when MSD or similar Ign systems are Installed. I never even searched for better coils for my SR. :sly: shame on me.

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Im hoping to be pleasantly surprised once i figure out wtf is going on.
I reviewed my subharness and switched the ground location. Didnt get a chance to try and start it as it was too late last night and my car is too loud.

Ill probably be working on it christmas day. Give my self a running car as a present

[VegasDrifterS13]

Originally Posted by ultimateirving

Im hoping to be pleasantly surprised once i figure out wtf is going on.
I reviewed my subharness and switched the ground location. Didnt get a chance to try and start it as it was too late last night and my car is too loud.

Ill probably be working on it christmas day. Give my self a running car as a present

Lol. Merry Christmas.

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[slow92]

Just so you know, you are not using the factory sr20 igniter anymore. I re-read your original post and you talked about wiring straight across. When you use the ls2 coilpacks you delete the factory sr20 igniter and wire the coilpacks directly to the ignition signal wires per cylinder from the ecu. This may be your problem.

Like I said I wired my coil packs signal wire directly into the main engine harness and bypassed the sr20 ignition sub-harness because you no longer have any need for it. This way the ecu controls the spark. Plus you have to have an aftermarket standalone ecu where you can change the dwell settings for the ignition system for the ls2 coils to work correctly.

[slow92]

Here are some diagrams that show you which pin on the ls1 coil packs get wired to what. The first link is to haltech and this is the diagram I used when doing my swap. It worked flawlessly and everything went smooth and the car started up on the first try using this diagram and using the suggested dwell settings for my ecu.

http://www.haltech.com/wp-content/up...-CONNECTOR.pdf

http://www.rx7club.com/attachments/h...2520wiring-jpg

http://www.rx7club.com/attachments/h...ns-ls1coil-jpg

[ultimateirving]

Wow thanks for the input.
I cut both plugs off of the wiring that goes to the ignitor and wired them straight across. As in E1-I1 and so forth. Is that acceptable? Then I used a plug cut from an sr coilpack sub harness and wired my ls2 coils to that plug. I was careful to match each cylinder to each wire. I also wired all 4 coils to 12v that's provided in the clip too.

And I have read in a few other posts that the ls2 coils will I fact work with stock sr Ecu dwell settings.