RB Engine Coil Retrofit

[Acecool]

Just ordered mine :-)

Cylinder 4 coil pack is screwing up on me now when HOT

[rb 90 240]

So for the series 2 rb25's, does anyone have a list of the parts needed. I would like to convert to this setup on my car as well but dont want my computer to end up like the above photos. I have a friend that will do the wiring but I just need to round up the parts. Also I hear you mentioning using a larger gauge wire, what gauge are you guy using?

[raremotive]

Another added benefit, is now that the hot ignitor is now off the engine top, the engine will now run cooler, on top.

I will look into this, the idea of a wasted spark is a little unsettling to me...lifespan on spark plugs is reduced..
Modified by Rare_f8 at 12:07 AM 1/18/2008

[Makenski]

Wasted spark not the way to go.

Reason being misfire possibility..

For instance, cylinders 1 and 6, if cylinder 1 is one ignition round, then cylinder 6 just completed exhaust stroke, and beginning on it's intake stoke.

Now in a rb26dett stock setup, intake valve opens 7 degrees before the piston reaches it's top dead center(TDC) is reached, and the exhaust closes at 7 degrees after TDC.

Now that said, at that moment, air is being forced in through the intake and some out the exhaust.(This is why advancing timing, and retarding exhaust is benifitial). With the wasted spark, while air and fuel is being push through, you add a spark... boom misfire.

If a coil like that can be wired up... then why can't a coil like this be wired up...and be just as cheap.

http://store.summitracing.com/...w=sku
Modified by Makenski at 12:30 AM 1/18/2008

[matafied]

you can

[240z4u]

I may do the exact setup you guys are doing, but no wasted spark and with LS1 coils. Not sure if i will ever get around to it, but if I have more coil problems thats what I am doing.

Evan

[matafied]

yep, you can use what ever coils you want with exceptions as long as you have a ignitor to drive em.

[Acecool]

Well, the reason I am doing this is because my number 4 coil went bad on me... randomly doesnt work... and it is the coil, not the igniter because I just swapped the igniter for a z32 one and moved the coil to cylinder 1 and it did the same thing...

[BoostFab]

Wasted spark not the way to go.

Reason being misfire possibility..

For instance, cylinders 1 and 6, if cylinder 1 is one ignition round, then cylinder 6 just completed exhaust stroke, and beginning on it's intake stoke.

Now in a rb26dett stock setup, intake valve opens 7 degrees before the piston reaches it's top dead center(TDC) is reached, and the exhaust closes at 7 degrees after TDC.

Now that said, at that moment, air is being forced in through the intake and some out the exhaust.(This is why advancing timing, and retarding exhaust is benifitial). With the wasted spark, while air and fuel is being push through, you add a spark... boom misfire.

there are tons of cars out there that runs waste sparks, you just don't realize it. i see your concept there, but it doesn't work as so in reality. Even if the spark happens at the same time on two cylinders, the other cylinder would not see fuel, spark or not it wouldn't matter. now if you wire up wrong or your timing is wayyyyyyyyy off, then you have a big problem.

If a coil like that can be wired up... then why can't a coil like this be wired up...and be just as cheap.http://store.summitracing.com/...w=sku

you are right; that coil can be wired up as well, just do the wiring. everyone is following the how-to uses the GM style coil, they don't want to venture outside of the box. heck you can even wire up 6 individual coils, but then it'll be out of a person's budget goal.

[mott6904]

I recently finished my coil retrofit setup and this is what i came up with. I think it turned out pretty good and i was able to move the ignitor in a cooler place also.
Modified by mott6904 at 6:16 PM 2/5/2008

[BoostFab]

I recently finished my coil retrofit setup and this is what i came up with. http://a352.ac-images.myspacec...f.jpgI think it turned out pretty good and i was able to move the ignitor in a cooler place also.

picture is too small bro

[DriftX]

This is a simple wiring diagram for those who are running the z32 ignitor and wish to wire up the gm/buick coil conversion. This also eliminates the small 14 gauge wire to control the coil, rather now this includes how to wire up a relay and using 10 gauge wire directly feeding from battery.

[matafied]

exactly how i have done both of mine +1

awsome diagram Drift X

[a1cpunker]

This is a simple wiring diagram for those who are running the z32 ignitor and wish to wire up the gm/buick coil conversion. This also eliminates the small 14 gauge wire to control the coil, rather now this includes how to wire up a relay and using 10 gauge wire directly feeding from battery.

this might be a stupid queestion but what kind of relay is the 4 prongs relay? can you post a Part #? or is it one of the 4 prongs on the car. thank you sir

[DriftX]

A four prong relays mean it has the coil inside which has a ground on one side and 12v on the other, thus creating a magnetic field, closing/pushing the gate shut, completing the circuit.

So ground, 12v, B+, and B+ to coils.

You can use any 4 prong relay really, a cheap one would be a fuel pump relay, snatch one from the junkyard for a dollar or two.

Brand new 11 bucks at advance auto:

GP Sorenson Part Number: 415021

For 96' 300zx fuel pump relay

Modified by DriftX at 12:41 PM 2/28/2008
Modified by DriftX at 12:42 PM 2/28/2008

[240z4u]

Often times you will see a 5 prong relay as well, one of the terminals is normally closed and one normally open (he drew the normally open one). They will work too.

DriftX, nice diagram. I am sure that will help alot of people out! Thanks for taking the time to make such a neat picture to follow.

Evan

[a1cpunker]

A four prong relays mean it has the coil inside which has a ground on one side and 12v on the other, thus creating a magnetic field, closing/pushing the gate shut, completing the circuit.

So ground, 12v, B+, and B+ to coils.

You can use any 4 prong relay really, a cheap one would be a fuel pump relay, snatch one from the junkyard for a dollar or two.

Brand new 11 bucks at advance auto:

GP Sorenson Part Number: 415021

For 96' 300zx fuel pump relay

Modified by DriftX at 12:41 PM 2/28/2008

Modified by DriftX at 12:42 PM 2/28/2008

Thank you sir for the detail explanation.

that really clear things up for me.

[DriftX]

I'm glad that helped you guys.

[BoostFab]

Often times you will see a 5 prong relay as well, one of the terminals is normally closed and one normally open (he drew the normally open one). They will work too.

all the 5 prong is good for is if you are running multiple relay on the same bank. the 5th prong allows feeding of full power to the next relay. in a series one after another. if you are running only 1 relay just get the 4 prong.

an example of multiple 5 prong relays

[240z4u]

Man all sorts of good diagrams here, I am sure this will really help someone out.

My point was merely that you didn't have to go buy another 4 wire relay if you already have a 5 wire one lying around.

Evan

[DriftX]

?How ironic it is that the guy who made the diagram is having trouble after doing the swap.

matafied, what problems did you run into? Mine is misfiring on light load, but will idle fine?

Is there something i am missing? I have an rb20 with 300zx ignitor (repinned, ground in middle)

That ground goes to stock coilpack harness ground location.

Ground near 3 pin plug is on firewall, same as it has always been.

I am not useing the timing wire..

bracket is metal, bolted to the coil setup with gaskets in the middle.

do i need to ground the bracket?

I ran power wire to relay, ground off relay..10 gauge wire from battery to relay, 10 gauge from relay to power coil

also how did you get those wires in the boots???? I had to cut my boots to slide them in and tape them up

Edit: connection on 3and4 wiggled loose, all good now!Car feels much smoother than ever!still running 14:1 afrs at wot :-|

Modified by DriftX at 4:49 PM 3/3/2008
Modified by DriftX at 6:17 PM 3/3/2008

[matafied]

silicone was my friend.

also i run ac delco plugs with my setup, they work better than the hks ones i have, they came out of a 06 malibu

[DriftX]

lol im blonde.

How did you get those spark plug boots on?

[jon1971]

I have a s2 rb25det. I'm trying to wire everything up. Here is a picture along with my question.

Where does the timing signal come from?? I.E. if from the ecu which pin #?

[jon1971]

I have everything installed but the timing wire. The car will not fire a lick!

[kev-bo]

here is a pic of the mod i did turned out great!! thanks for the help

[onepuff]

Nice job man. Very clean. What wires did you use? Did you just drill a nice size hole in the spark cover?

[alex240rb]

I am in the current but slow process of installing a haltec e6 and going with ls1 coil packs when I get it done I will let you guys know how it goes

[onepuff]

Just got my coil retrofit on last week. Working great. I used the spot in the factory fuse box for the fog lights(which i don't have) to run the power through a relay. It was breaking up a bit without the 10 gauge wire to power the coil. The little white wire from the ignitor wiring is definitely not enough. I love this mod so far. Anyway here's the pics. The wiring will be cleaned up more soon. I also need to get some longer spark plug wires so i can put the plug cover back on and maybe move the coils farther over towards the passenger side. No comments about the valve covers please.

[rudedrift]

i have a valid question here.i have series II rb25. no igniter.since there is no igniter and the coils amplify thier own spark. meaning the ecu sends the trigger, off six seperate wires. to each coil.couldnt wire up the coil power same as you guys, ,run the factory triggers(pins 1,2,3,11,12,13)in pairsto the gm coil, ?and ground the gm boxdoes that make sense?i'm about ready to make this upgrade and i've been thing about this for a while.i mean i do have spare rb20 ignigter and harness, but i'm checking evey angle.