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HKS released a "coil-on-plug" ignition system for the FD

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Old Apr 13, 2026 | 06:46 PM
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From: Japanabama
HKS released a "coil-on-plug" ignition system for the FD

https://revspeed.jp/2026/04/62745/?fbclid=IwZXh0bgNhZW0CMTAAYnJpZBExODlITVZzM3gwN1lu V0FMTXNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4a6I VwLgBQ7-96ZO3CGjmbfLOpvSZALq3tEHiPodIMuilWCv-OObgpPUsskw_aem_1o6AwG4nSXbQsxykNlWJCA

A prototype was displayed at this year's Tokyo Auto Salon, but I guess they decided to actualy release it.
It doesn't work with the stock ECU, though.

Changing the plugs looks like a nightmare.
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Old Apr 13, 2026 | 07:32 PM
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I assume "independent ignition settings" is another way of saying "direct fire ignition".

At north of $1500 it's a pricey option versus any number of IGN-1A solutions of various configurations. And they stick out quite a ways. Gonna be a tight squeeze against the strut tower, especially with an oil line in there coming off the pedestal. And require full ignition system removal just to change even a single plug.
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Old Apr 13, 2026 | 08:07 PM
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From: Japanabama
I think you're referring to the last part, which essentially says it requires an "ECU capable of being configured for direct-fire ignition*."

*or any one of its many synonoms

I assume LHD owners won't even think about this option.
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Old Apr 13, 2026 | 08:43 PM
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HKS is late to the game on this one. Folks have been building R35 coil on plug mounts for awhile. They're just not that commonly used.

https://www.billetrotary.com.au/prod...iUziAAEQClW2lZ
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Old Apr 13, 2026 | 09:08 PM
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From: Japanabama
Ignoring shipping and tariffs, that's cheaper than the HKS kit, but I suspest the market price will be quite a bit lower than 200,000 yen.
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Old Apr 14, 2026 | 08:25 AM
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From: https://www2.mazda.com/en/100th/
HKS makes some interesting claims, https://www.hks-power.co.jp/en/produ...onics/db/36881

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Old Apr 15, 2026 | 05:41 AM
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If you were happy to run zero split you could still use factory engine loom and run just from the trailing trigger signals if using a plug in ecu.


Doesn't really look any different to kits that have been available in Australia for about a decade?

Last edited by Slides; Apr 15, 2026 at 05:43 AM.
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Old Apr 15, 2026 | 08:35 AM
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From: https://www2.mazda.com/en/100th/
Originally Posted by Slides
If you were happy to run zero split you could still use factory engine loom and run just from the trailing trigger signals if using a plug in ecu.


Doesn't really look any different to kits that have been available in Australia for about a decade?
it does, i see places where you could put knock sensors, do people run them with this kit still?
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Old Apr 15, 2026 | 08:42 AM
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I can't imagine the benefit of this (or similar) setup is worth the hassle in changing or checking plugs
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Old Apr 15, 2026 | 12:07 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by ptrhahn
I can't imagine the benefit of this (or similar) setup is worth the hassle in changing or checking plugs
the coil is held with a 6mm bolt, so you pull that pull the coil, and then you'd need an extension to pull a plug.
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Old Apr 15, 2026 | 04:29 PM
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From: Japanabama
Originally Posted by j9fd3s
the coil is held with a 6mm bolt, so you pull that pull the coil, and then you'd need an extension to pull a plug.
My assumption is that you just pull all four coils by removing the two bigger bolts.
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Old Apr 15, 2026 | 05:57 PM
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I'd be interested in this ignition system if it works like they claim (which seems ludicrous, given the numbers in those charts) - no idea if it would work with my A'PEXi Power FC, though.
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Old Apr 15, 2026 | 06:28 PM
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From: Japanabama
Originally Posted by HiWire
I'd be interested in this ignition system if it works like they claim (which seems ludicrous, given the numbers in those charts) - no idea if it would work with my A'PEXi Power FC, though.
I wonder whether those numbers are compared to (potentially 30 years) old or new stock coils.
It's not surprising that there is some benefit to better ignition.
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Old Apr 15, 2026 | 09:27 PM
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Originally Posted by j9fd3s
it does, i see places where you could put knock sensors, do people run them with this kit still?
There hace definitely been knock sensor tabs on kits for a while.
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Old Apr 16, 2026 | 12:13 AM
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Originally Posted by Valkyrie
I wonder whether those numbers are compared to (potentially 30 years) old or new stock coils.
It's not surprising that there is some benefit to better ignition.
It actually started me on a search through spark plugs... my ignition system might be fine.

I don't like how it sticks out, either, how it complicates removing the spark plugs, the price, or all the stuff I'd have to change just to get it to work.

Let someone else be the guinea pig for that (it did immediately bring Billj747's MotoIQ MSD CDI update to mind)!

Last edited by HiWire; Apr 16, 2026 at 12:21 AM.
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Old Apr 16, 2026 | 08:31 AM
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From: https://www2.mazda.com/en/100th/
Originally Posted by Valkyrie
I wonder whether those numbers are compared to (potentially 30 years) old or new stock coils.
It's not surprising that there is some benefit to better ignition.
there are three changes, 1 the different spark plug, two running sequential ignition and 3 the fancy coils
i wonder what happens with just the plugs
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Old Apr 16, 2026 | 05:47 PM
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From: Japanabama
Originally Posted by j9fd3s
there are three changes, 1 the different spark plug, two running sequential ignition and 3 the fancy coils
i wonder what happens with just the plugs
The plugs are just rebranded (and maybe slightly customized) NGK racing plugs.

This like when a flour company recommends their own flour in a bread recipe.
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