B58 Ignition Coil DIY solutions

Scorpstan

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Feb 27, 2017
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Nope! I sent a couple e mails ,he responded twice then stopped, at this point I've given up hope and started exploring my options! I can easily put together my own kit but the hardest thing for me is finding the correct coil connectors and spark plug boots.
you can find the coil connectors on aliexpress. i can post a link.

for a plug n play option you can mix it with a PR harness kit.

at the moment i have the right length of the boots here, but they haven´t a resistor inside. i think its absolutly nessesery to have a resistor like the original b58 coils have it.
 
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pysical

Sergeant
Jun 16, 2017
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This is a pretty good option: https://www.e90post.com/forums/showthread.php?t=1814915

I went with it because of the wait time, and I don't really care to spend extra money on the engine bay looks. My boots do not have a resistor in them. I have only been able to idle my car due to missing windshield and other body parts. I am hoping to put some driving time on these in a couple weeks.
 

Scorpstan

Specialist
Feb 27, 2017
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This is a pretty good option: https://www.e90post.com/forums/showthread.php?t=1814915

I went with it because of the wait time, and I don't really care to spend extra money on the engine bay looks. My boots do not have a resistor in them. I have only been able to idle my car due to missing windshield and other body parts. I am hoping to put some driving time on these in a couple weeks.
I saw your Post. Cannot answer there.

I believe it is necessary to have a resistor.
without them I saw burned springs and I think it will damage the sparks too
 
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pysical

Sergeant
Jun 16, 2017
430
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2009 335xi E90
I saw your Post. Cannot answer there.
I believe it is necessary to have a resistor.
I saw burned springs and I think it will damage the sparks too
Hmm I will have to do some more research. I am rebuilding my car and was looking for a good option. I didn't have good results with PR, R8 burned my car down, so at the time these were popping up and sounded good. I tried to get these but was getting no response back so found the other kit.
 

Dumaurier7

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May 19, 2020
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I will appreciate the link very much, my initial plan is to use the harness adapters from my PR kit, I guess great minds think alike :grimacing: ! Anyone else know where to find the boots?
 

Scorpstan

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ShocknAwe

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Jan 24, 2018
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I'd be interested in this. Gonna put the engine cover on anyways so who cares what it looks like

Now for the resistor... Dunno. This is definitely not my area.
 

Dumaurier7

Sergeant
May 19, 2020
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Anyone know what boots to use,?I have looked at a few but for some reason the manufacturer doesn't state the dimensions and the vendors don't have a clue either.
 

Dumaurier7

Sergeant
May 19, 2020
286
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Anyone know what boots to use,?I have looked at a few but for some reason the manufacturer doesn't state the dimensions and the vendors don't have a clue either.
Someone out there must know the boot to use, this is all i'm missing to get this together! .........Anyone? I would much rather buy a kit but I can't stand the poor communication (slow updates) and slow progress from the suppliers.
 

pysical

Sergeant
Jun 16, 2017
430
104
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Ride
2009 335xi E90
Best bet would be reaching out on Facebook or somewhere and see if anyone has a kit and will pull a boot and check for part number. I seen a YT video of a guy installing these which show good image of what they look like. Maybe you could take screenshot and then Google image search.
 

MR-KRAKA

Lurker
May 23, 2020
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https://prenco.com/wp-content/uploads/2020/12/36221A_Illustrated-Guide_Reduced.pdf
I never really post on here but saw this thread and figured I’d chime in. I’ve been all through this catalog and currently have tried just about everything that would fit length wise. I’m waiting on spp209e still which is for 2015+ Ford 2.7 ecoboost no clue if it will work but looks promising and for $20 I’ll take a shot. I’ve tried raiding the coil boot section behind the counter at the parts store doing comparisons coil and boot in hand with no luck. Currently running spp191e (Audi/VW 2.0tfsi) which are shorter than I’d like but work. The pigtail I got was for a VW cam sensor I don’t remember what year/model. They can be sourced for pennies if you want to wait the month or so from China. Rock auto has been great for all this stuff since most are not typically stocked at your local auto store. I’m still waiting on my precision harness and 2 new coils (took a chance on a used set) to complete it.
For mounting all I’m using is a 1/4 x 3” exterior screw and a 1” spacer in the small unthreaded hole to right of the spark plug hole. Fits perfectly and is very secure with this super simple method. I originally had made a bracket connecting the 3 on each bank but it was not necessary and a pain to change out one coil. You just have to be very careful to screw it in straight on and if you feel it bind STOP. The cover fits with no issues. I planned on doing a little write up once I figured it all out but that’s the meat of it. I’ll update once they arrive Tuesday I’m hoping. Don’t mind my 2 retro eldors on 2/4 I’m still on stock dwell tables
 

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MR-KRAKA

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May 23, 2020
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Update- SPP 209E (CPBK206 for the set of 6) Overall a MUCH better fit than I was using especially the plug to spring connection. I did have to extend the skinny coil end about 10mm or so to feel better about it. Other things to note, the cap that goes over the plug well is slightly smallish for it and needs to be kind of smushed over it before tightening down. You also must be more careful with my method since this results in it not being perfectly flat when mounted. I also had to add another 1/4” or so to my spacer to make up for this. It could probably be trimmed off but I’d rather have the hole sealed up. There is another version of these that are 25-30mm longer SPP223E for 2018+ F150 3.5 ecoboost but I’m going to stop with these. I only had time to get the easy bank done and go for a quick spin…

This is where I ran into trouble. As soon as I layed into it I got misfires on cylinders 2,3 I’ll have to recheck everything when I have time. In my rushing I realized I didn’t apply any dielectric grease thinking there was probably plenty still on the plugs. I have not updated the dwell tables but the stock ones should be ok. I feel like this should have been fine and am starting to wonder if the factory resistor in the B58 boot may actually be needed? Someone smarter than me will have to figure that out. Most modern plugs have integrated resistors so I figured it would be fine. I had this issue on my first iteration and the issue followed those two coils to the next cylinders I moved them to so I just bought 2 new ones that I’m still waiting on… Or maybe I should stop being so cheap and buy the rest of a new set of eldors Idk. Hopefully I can get a chance to mess around with it this weekend. From what I understand the other options out there removed them as well? A little help?
 

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Jeffman

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you can find the coil connectors on aliexpress. i can post a link.

for a plug n play option you can mix it with a PR harness kit.

at the moment i have the right length of the boots here, but they haven´t a resistor inside. i think its absolutly nessesery to have a resistor like the original b58 coils have it.
Are you saying that the PR connectors fit the B58 coils?
 

fmorelli

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Aug 11, 2017
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There is a long and exhaustive set of research that was done to show that the R8 coils were a poor fit, out of the box, for the N54. A lot of work was done to characterize this, specifically, all the while people ran them and thought they worked fine ... until they didn't. Not saying any of that is your issue (though you may find the thread interesting, given what you are playing with). I will tell that the R8 coils were actually not making contact to the spark plugs, but the spark was jumping the gap and still firing across the plug tip. That is until the added resistance eventually started to break the coil down, and the result started to be not enough juice to jump from coil to plug.

Also ... most people miss this ... the coil cylinder hole in the head is not straight but curved! So if you are assuming that things line up ... not how it works. We figured all of this out when attempting to sort out what was going on with the BL setups.

Hope this helps.
 

Scorpstan

Specialist
Feb 27, 2017
87
79
0
Ride
335i
Update- SPP 209E (CPBK206 for the set of 6) Overall a MUCH better fit than I was using especially the plug to spring connection. I did have to extend the skinny coil end about 10mm or so to feel better about it. Other things to note, the cap that goes over the plug well is slightly smallish for it and needs to be kind of smushed over it before tightening down. You also must be more careful with my method since this results in it not being perfectly flat when mounted. I also had to add another 1/4” or so to my spacer to make up for this. It could probably be trimmed off but I’d rather have the hole sealed up. There is another version of these that are 25-30mm longer SPP223E for 2018+ F150 3.5 ecoboost but I’m going to stop with these. I only had time to get the easy bank done and go for a quick spin…

This is where I ran into trouble. As soon as I layed into it I got misfires on cylinders 2,3 I’ll have to recheck everything when I have time. In my rushing I realized I didn’t apply any dielectric grease thinking there was probably plenty still on the plugs. I have not updated the dwell tables but the stock ones should be ok. I feel like this should have been fine and am starting to wonder if the factory resistor in the B58 boot may actually be needed? Someone smarter than me will have to figure that out. Most modern plugs have integrated resistors so I figured it would be fine. I had this issue on my first iteration and the issue followed those two coils to the next cylinders I moved them to so I just bought 2 new ones that I’m still waiting on… Or maybe I should stop being so cheap and buy the rest of a new set of eldors Idk. Hopefully I can get a chance to mess around with it this weekend. From what I understand the other options out there removed them as well? A little help?
the SPP209E dont will fit with n54 cover.
there will be need boots with 155mm length.


this would be the part number link for it.

unfortunately these boots have no resistor inside. but since i want to use the original resistor, these boots have to be changed a bit. I will keep you up to date.

the SPP175E could also be used. as these are 169mm long, they would have to be shortened.
 

Scorpstan

Specialist
Feb 27, 2017
87
79
0
Ride
335i
Are you saying that the PR connectors fit the B58 coils?
you can mix it with the connector which i posted here. ->#6

But its not nessesarily. You can clamp the connector(Post6) to the stock wires.
 
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Scorpstan

Specialist
Feb 27, 2017
87
79
0
Ride
335i
There is a long and exhaustive set of research that was done to show that the R8 coils were a poor fit, out of the box, for the N54. A lot of work was done to characterize this, specifically, all the while people ran them and thought they worked fine ... until they didn't. Not saying any of that is your issue (though you may find the thread interesting, given what you are playing with). I will tell that the R8 coils were actually not making contact to the spark plugs, but the spark was jumping the gap and still firing across the plug tip. That is until the added resistance eventually started to break the coil down, and the result started to be not enough juice to jump from coil to plug.

Also ... most people miss this ... the coil cylinder hole in the head is not straight but curved! So if you are assuming that things line up ... not how it works. We figured all of this out when attempting to sort out what was going on with the BL setups.

Hope this helps.
the r8 coils fits perfect if you cut these noses on the top away. a small push on it and the spark sits pefect in the socket of the coil.
the other reason is why people have problems is because they turned it in a wrong position.

the right way will give you 5mm more. look at pics below.
 

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