B58 Coil Conversion?

[NORAGRETS]

Anyone done this mod to convert to the B58 coils?

Kits and coils going for $500 ish.

Supposedly 2.3x the spark as the S55 coils, can anyone attest to a difference in performance?

[DeTh]

Subbed, want to hear about performance gains

[Dsmdrew]

I have a kit but haven't installed it yet. I asked bm3 if adjusting the dwel is really needed they said no. I was worried about running them without the dwel changed

[NORAGRETS]

Originally Posted by Dsmdrew

I have a kit but haven't installed it yet. I asked bm3 if adjusting the dwel is really needed they said no. I was worried about running them without the dwel changed

I would adjust it it doesn't make sense not to why wouldn't you?

[chetrickerman]

Yes, I did it and its worth it. Less ignition timing corrections overall.

[Hotflare]

Originally Posted by chetrickerman

Yes, I did it and its worth it. Less ignition timing corrections overall.

Night and day

[b_w.]

From what I recall reading no returning is required but for best results have them installed prior to a custom tune.

[RoundelM3]

[QUOTE=NORAGRETS;30617995]Anyone done this mod to convert to the B58 coils that are on the G80's? Kits and coils go for $500 ish. Supposedly 2.3x the spark as the S55 coils, can anyone attest to a difference in performance?

Wouldn't that be S58 coils?

[NORAGRETS]

[QUOTE=RoundelM3;30620693]

Originally Posted by NORAGRETS

Anyone done this mod to convert to the B58 coils that are on the G80's? Kits and coils go for $500 ish. Supposedly 2.3x the spark as the S55 coils, can anyone attest to a difference in performance?

Wouldn't that be S58 coils?

Not G80 idk why I said that.

[chetrickerman]

Originally Posted by b_w.

From what I recall reading no returning is required but for best results have them installed prior to a custom tune.

Correct, you dont need to retune for the new coils. The B58 ignition coil dwell time is very close to the same as the S55.

[wheela]

Originally Posted by chetrickerman

Yes, I did it and its worth it. Less ignition timing corrections overall.

Does anybody understand the technical reason coils would help with timing corrections? I understand how they help misfire (more energy needed to jump the gap with higher boost and e-content). But timing corrections should in response to knock/ping/pre-ignition. How would a more powerful coil reduce knock/pings/pre-ignition?

I'm wondering if different coils have different amount of spark latency (time between being told to fire and actually firing), so potentially impacting your actual spark timing, despite running the same timing map? It would make sense with different windings you get different inductance values, and therefore different latency? I've researched it a bit and found some clues suggesting this, but haven't found anything definitive.

[chetrickerman]

Originally Posted by wheela

Does anybody understand the technical reason coils would help with timing corrections? I understand how they help misfire (more energy needed to jump the gap with higher boost and e-content). But timing corrections should in response to knock/ping/pre-ignition. How would a more powerful coil reduce knock/pings/pre-ignition?

Its pretty simple, improved flame propagation and combustion stability

Originally Posted by wheela

I'm wondering if different coils have different amount of spark latency (time between being told to fire and actually firing), so potentially impacting your actual spark timing, despite running the same timing map? It would make sense with different windings you get different inductance values, and therefore different latency? I've researched it a bit and found some clues suggesting this, but haven't found anything definitive.

No

[n8dgr84]

Originally Posted by chetrickerman

Its pretty simple, improved flame propagation and combustion stability



No

Got any logs to show the difference? Is it mostly around peak combustion pressures?

[wheela]

Originally Posted by chetrickerman

Its pretty simple, improved flame propagation and combustion stability



No

Thanks for your response. I did some more searching to try and understand the "why" behind this, and finally came across some intersting research articles related to this. In this article, they're reasearching fuel economy in a natural gas (NG) spark ignition engine,
but the focus is ignition of the combustible mixture based on spark energy, so directly analogous. They're basically saying that with higher spark energy, the bigger spark kernel reduces the ignition delay, and increases the initial flame propagation speed during ignition. So it's improving flame propagation and combustion stability by "kick starting" (my own words) the flame propagation out from the ignition point (the spark kernal) through the mixture in the cylinder - this I can get my head around.

https://www.sciencedirect.com/scienc...60544221024920

[wheela]

So I'll be adding b58 coils to my build list

[n8dgr84]

Based on my logs, I don't think upgrading ignition helps significantly until you upgrade turbos. It adds weight, so you have to consider that, as well, if you're a road racer and care about handling.

[NORAGRETS]

Originally Posted by n8dgr84

Based on my logs, I don't think upgrading ignition helps significantly until you upgrade turbos. It adds weight, so you have to consider that, as well, if you're a road racer and care about handling.

What is it; 2lbs?

[Dsmdrew]

I want to see logs! I'll install mine after I see some logs

[wheela]

Originally Posted by Dsmdrew

I want to see logs! I'll install mine after I see some logs

You have the kit, right? Throw her on and take some logs! You can do it!!

[n8dgr84]

Originally Posted by wheela

You have the kit, right? Throw her on and take some logs! You can do it!!

Here is my review with datalog
https://f87.bimmerpost.com/forums/sh....php?t=2092743

[b_w.]

I have not moved my car from the garage yet but it idles nice and smooth with the b58 coils

[NORAGRETS]

Originally Posted by b_w.

I have not moved my car from the garage yet but it idles nice and smooth with the b58 coils

What kit are you running?
Coils?
Sparks?
What’s year is your car?

I’m beginning to wonder if production date has anything to do with the ability to run the coil swap without issues….