Technical Ignition Coil Secondary Spark Energy Comparison (N54/N55, B58 and PR)

Msport335

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Jun 7, 2018
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Can anyone tell me what this does and if it could possibly be the issue I'm having with major timing correction? Its pretty damn hot to the touch given the engine is completely cooled since this morning. Running eldor coils from fcp... getting corrections up to -8 deg. Been through the entire fuel system and everything's good there
 

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fmorelli

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Which component in the diagram is it? Not obvious from what you posted.
 

Msport335

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Jun 7, 2018
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What I'm looking for is the ignition coil interference capacitor....my dme box does not look like it has one in there...all I see is the black relay which is hot to the touch
 

Dgw7000

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Mar 5, 2021
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Can anyone confirm correction problems with these Eldor b58 coils? Some are saying they are bootleg coils being sold and not the original factory BMW B58 coils you get at the dealership!! I bought six from Beemerworld and considering sending them back and just buying the original from BMW to avoid any potential problems when I installed a kit on my car!!
 
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SlowE93

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Can anyone confirm correction problems with these Eldor b58 coils? Some are saying they are bootleg coils being sold and not the original factory BMW B58 coils you get at the dealership!! I bought six from Beemerworld and considering sending them back and just buying the original from BMW to avoid any potential problems when I installed a kit on my car!!
If you are that worried about it, I would buy from whoever you are most comfortable with.
One individuals experience will vary from others.
 

_Calle_

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Jul 7, 2017
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I run the kit for about 1500 miles, unfortunately I noticed that 4 out of 6 springs have burn marks at the spring end that is in the coil.
The contact surface in the coil also.

The problem is, that the spring touches the plastic cone in the coil, so the spring do not touch the contact surface of the coil, see also the schematic.

Does anyone else have the problem?
Spring_001.jpg
Spring_002.jpg
Coil_002.jpg
schematic.jpg
 

bahn

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Nov 5, 2016
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I run the kit for about 1500 miles, unfortunately I noticed that 4 out of 6 springs have burn marks at the spring end that is in the coil.
The contact surface in the coil also.

The problem is, that the spring touches the plastic cone in the coil, so the spring do not touch the contact surface of the coil, see also the schematic.

Does anyone else have the problem?
Hey Calle, we've seen this happen two times now and it seems to be related to manufacturing tolerances of the ignition coil itself. What brand of coil are you running and where did you purchase it from? The samples I have in hand do not have a plastic cone inside (see picture below). We also did a dychem test to ensure the spring is contacting the secondary contact.


1628251753052.png
 

_Calle_

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Jul 7, 2017
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Germany
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e82 135is
Hey Calle, we've seen this happen two times now and it seems to be related to manufacturing tolerances of the ignition coil itself. What brand of coil are you running and where did you purchase it from? The samples I have in hand do not have a plastic cone inside (see picture below). We also did a dychem test to ensure the spring is contacting the secondary contact.

Hi Bahn,
my Coils are OEM BMW so it is Eldor, from a low mileage Car.
It is definitely not depend on the manufacturing tolerances of the coil. This is a functional area, so the tolerance will be maximum +- 0,10mm.
I think it is more depend on the aftermarket springs. If you take a look at the picture with the three spring, you see there are all different.
 

bahn

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Nov 5, 2016
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Hi Bahn,
my Coils are OEM BMW so it is Eldor, from a low mileage Car.
It is definitely not depend on the manufacturing tolerances of the coil. This is a functional area, so the tolerance will be maximum +- 0,10mm.
I think it is more depend on the aftermarket springs. If you take a look at the picture with the three spring, you see there are all different.
Can you please send a picture of the coil and the part number? I ask because I have Bosch and OEM Eldor BMW coils on hand and neither have the plastic cone seen inside your coil, I want to see what the date code is as there's a possibility BMW made some design changes. I took a couple quick measurements for you. OEM BMW Eldor on left, Bosch on Right. Smallest inside diameter before the coil contact is 8 mm.

Notice no plastic cone inside of either.
20210809_073151.jpg
20210809_073406.jpg

Smallest diameter inside the coil before the contact: 8.0 mm
20210809_081818.jpg
20210809_081838.jpg

Depth to bottom center of contact 11.15-11.20 mm (note: The shoulder of the contact is raised about 2mm so contact with the widening portion of the spring can be achieved at a depth of ~9 mm)
20210809_075450.jpg
20210809_075504.jpg

Widest section of our spring at a depth of 9-12mm (I went through about 10 springs and this is the widest with most around 7.50-7.55 mm)
20210809_080055.jpg


That cone design inside your coil seems to be the issue. Send me some pictures of the model & index number and if needed we'll modify the spring design to work with that coil design as well and send you a set for free.

Thank you,
Austin
 

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