Mazda 'C' Ignition Coils...Updated.
 

Mazda has released updated RX-8 Ignition Coils for ALL Series RX-8's.

N3H1-18-100C

Came into production on the Spirit R's and 2012 MY.

Mazda Part's interchangeability code is 'A' ,meaning one way use only, new part (the C coil) for install in old models but not old part (the A or the B coils) install in new model (Spirit R or 2012 MY).

The 'C' s are more expensive (@ around $100 each).

Eventually they will be available locally once the B's have been supply exhausted.

Mazda OE Ignition Coil Parts HISTORY...
N3H1-18-100_ Series I RX-8 2004-2007MY
N3H1-18-100A Series I RX-8 2007-2008MY
N3H1-18-100B Series II RX-8 2009MY* - 2011MY
N3H1-18-100C Series II RX-8 Spirit R - 2012MY

EDIT: IF you are looking for OEM (Genuine Mazda) COILs for your RX-8 of ANY YEAR or Series then
there is only ONE Updated Coil to buy new now, that is N3H1-18-100C (for/in any country).
BUT for North American MAZDA DEALER PARTS it is ONLY sold under the 'B' iteration with a localized '9U' at end of Part Number.
Rest assured these COILS are the 'C' type inside the box.

Order from a US Mazda Dealer....
https://www.parkmazdaoemparts.com/pa...&siteid=215334

Order from Paul @ MazMart....(see the 'C' Coil box pic below)....
MAZMART - Serving The Mazda Community Since 1980. RX8 Ignition

https://www.rx8club.com/attachment.p...1&d=1353750447

* There were a few late production 2008MY Series I's which had the 'B' Coil installed, for the 40th Anniversary RX-8.

https://www.rx8club.com/attachments/...h1-18-100c-png

https://www.rx8club.com/attachment.p...1&d=1353751003

:shocking::shocking::shocking::shocking::shocking: :shocking::shocking::shocking:
ALERT:
BE VERY CAREFUL BUYING THESE 'GENUINE' MAZDA COILS FROM eBay SELLERS AS ALMOST ALL OF THEM ARE SELLING CHEAP 'KNOCK OFFS'.
PLEASE DO NOT BUY AS THEY FAIL AND CAN LEAVE YOU STRANDED ON HIGHWAY SIDE.

IT IS JUST NOT WORTH THE INCONVENIENCE JUST TO SAVE A FEW $$$'s, LET ALONE POSSIBLE ENGINE DAMAGE.
:shocking::shocking::shocking::shocking::shocking: :shocking::shocking::shocking:

sounds like good news - but without knowing what they did ......

At 100 each it makes more sense to just go with a BHR lol. But like ^^ said ... we dont really know what changed atm

Of course. Placed order from Mazmart for an OEM set earlier today.:doh:

so it's an all out swap? Any idea what's different? Let me guess... they raised them off the mounting plate? Oh wait that's what they did with the S2s.... hmm

It will be a long time before we see these C's....

For the B's @ $55 US each...2.5 years ago $33 US each.

Right at the moment can't tell you...

Mazda's supplier obviously did some updates for it to be a 'A' interchange code.

No other parts in the 2012 S2 ignition system has changed.

Thanks Ash! I've hopefully still got a few years left in my BHR coils :)

Maybe i can speed that up a bit . These Cs were found very quickly !

Oh snap! well, without really knowing what changed we will put those in and hopefully by the next time you can get these new ones and there will be data on them. If all they did was raise them, then..........no big deal.

Brettus you think you'll have quicker access to them being so much closer to the peninsula?

Also doubt anyone seriously boosted will want to pony up their setup to be the test bed for these. Perhaps that was the hidden sarcasm in Ray's post :)

I would certainly have no problems using them in my setup given that I had great results with the original OEM coils .
But I do have the D585's fitted now and apart from inferior starting performance they are working just fine.

Well, seriously, I hope they "finally" update the coils to something that will last at least double of what B can do ... then I guess that will make everybody happy.

They did a good job of updating the original GARBAGE to A, then made it even more stable on the B version.

C ... at 100 bux a pop, they BETTER last ...

It looks like Mazda Motorsports is still stocking the rev. B.

Perfect timing, I need new coils soon.

No one, certainly not myself has suggested the new 'C' iteration of Mazda supplied RX-8 Ignition Coils are a 'performance' upgrade.

However like the plains, the A's and then B (currently sold in US) iterations these were factory listed as being an "A" interchangeability code, new for old, but not old for new, @ March 2006 and December 2007 (very last of Series 1 RX-8's) Vehicle Production.

This suggests to me that changes are possibly internal, could be material(s), plastics, and or design or both.

When they are made available they will install on the same mounting brackets and use the same Spark Plug Leads etc.

IF MNAO Parts continues to source these Ignition Coils from Japan, then I expect to see the C's possibly in 2013.

:)

"C" Coils are now available in Australia and Europe through Mazda Parts Dealers...must be ordered as a C.

Currently MNAO has around 5,000 of the B's (B-9U) Coils still in stock so until most are sold you probably won't see the C's anytime soon.

And no, at this stage I do not have a C Coil to do a direct visual comparison, I predict all the 'updates' are internal and externally their appearance is exactly the same...but I could be surprised.

Mazda's Parts Interchangeability code is an A.....
a New Part for Old install, but Old Part not to be used in cars with the new one installed.

5K something left ? ... it will take a while before it's all sold out.

Damn, does that mean I have to get it from somewhere else? :( DISLIKE !

Ordered new coils for my Series 2 at Rosenthal Mazda. They were listed as "B" on the site but they in fact sent me the "C" coils. 265 bucks. This was 3 months ago.

I'm at 71,000 now (anyone beat that?) so I pulled one of the original coils to give it a look see. No "white spot" or anything. Its a nightmare to get at these things so I'm gonna put it off until spring. Car runs fine, although some days it feels stronger than others--for the same outside temp--so it may just be due to the gas here. Sometimes I wonder if I'm really getting super unleaded at some of these stations..

When I pulled the end of the plug wire off a part of the coil came off with it. I just put it back on. I think the C coils have this part fused on so that won't happen again.


So all those who have series 2s who are replacing coils at 30-50k you are wasting your dough!

Beefy did you do an actual test on your coils, because having a white spot or not means nothing according to other threads. They degrade over time so they are definitely not working like new ones anymore, it is just a matter of how degraded they are. Lots of people have had luck with coils lasting a long time but for me it is cheap insurance that I have a good spark.


How many times have you changed your plugs so far?


The coils are actually pretty easy to get to you just have to either remove the intake or just pull it to the side.

Nope. I'll get around to it shortly, maybe if we have a couple days in the 50s or something. Its easy enough I justy have no room with my big hands. Change the plugs every 25K, so I'm almost due for a 3rd set.

Couple other updates...I'm back on the stock suspension after TWO aftermarket suspension failures. Trying to get used to the softness and body roll, but its not easy..

And I have perfected the thru the wheelwell oil change with 2 separates cap style wrenches and a midget ratchet. MUCH better/easier than lying under the car and undoing that blasted plate underneath. Plus, this way you're nowhere near all the old oil as it falls from the old filter..

Where do you live? I'm hoping for some days in the 50s as well, its been really cold for out here at 30-40 degrees and windy.

So do you have an oil pump then? When you remove the filter where does the oil drain to, do you just end up with oil all over something? I know you can crawl under there and there is a hole for the drain plug but I never noticed where the filter would drain to if you didn't remove the metal plate.

Just put in the "C" coils, along with new plug wires and plugs @ 72K and.....it feels and sounds just like before.

Pretty easy job, except for the dropping of 2 of the 10mm coil nuts into the engine bay--lost forever. Just happened to have a couple spares in my toolbox..Arms are all scarred. Plug wires were a cinch from below with the car on ramps. I might try to do the plugs next time from below, instead of using 22" worth of extensions thru the wheelwell lol.

This part does not exist according to the four dealerships that I called.

not available directly from mazda motorsports either.

must still be some stock left lol

looks like the only change is the bottom how its recessed

is that not how the B revs were? It has been a while since I looked at one but I thought that the B rev was similar.

N3H1-18-100C at Mazmart
 

We have these in stock by the way. 2 sets now but I'm bringing more :).

MAZMART - Serving The Mazda Community Since 1980. RX8 Ignition

Paul.

Damn, my coils (ordered elsewhere) arrived yesterday and they are the B version.

So when I opened the box I found that the coils inside has the 'C' part number stamped onto them, while the box was labelled 'B'. I guess I lucked out. Aside from that, the coils looked physically identical to the 'B' coils I removed from the car.

Here you go, Version 'C' (N3H1-18-100C available at Mazmart):

MAZMART - Serving The Mazda Community Since 1980. RX8 Ignition

Paul.

Coil order
 

Does anyone know the order these coils go? My mechanic tells me ignition coil A is causing engine light to come on. Is this the one nearest the front of the car or the bulkhead?
Driving a 2003 RX8 imported from Japan.
Appreciate any help/guidance out there
Tom

Your mechanic should be able to show you which one he's talking about, if he knows what he's talking about. Generally, it's wise to replace all 4 if one is found to be faulty anyhow.

Paul.

As always sound advice from Paul @ Mazmart....

Tom, I would be buying all 4 new OEM 'C' iteration Coils from Paul..

Thanks lads.
I bought a set of coils (100C), leads and plugs (NGK) online recently and my mechanic fitted them but engine light remained on and diagnostic said fault with all four ignition coils! They came in Mazda original parts boxes and supplied by UK dealer on eBay...

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251258753335
Re-fitted old ones and issue reverted to one faulty coil...this time coil A (prev ign coil B - unlikely to have replaced coils exactly suggesting just one acting up)
Appreciate it is worth replacing all four which is what I have intended to do. Also wondered if system recognises new C coils?
Will revert to seller.
Thanks again for help.

I just had the dealer install 4 new coils w/ wires so I wonder what they were after my BHR kit seemily failed. Guess i'll pull one off this weekend and see.

if u got it from one of the US dealers, it's B revision for sure. Since Mazda NA still have thousands of B left.

Just wanna update this to whoever search and came into this thread

MNAO will NOT change the part number, I think they are just being lazy, now most if not all of the so called 100B-9U coils u get from MNAO are C inside the box, they actually just label the C over with their own 100B-9U label.

I installed at least 30 sets of C coils into people's car, so far so good, some got over 20K out of it already with no signs of failure, well of course even B doesn't fail that fast. but it does seem that it will last longer than B.

Great information on this site. Any idea whether the coils purchased from Advanced Auto Parts are the Cs? I just purchased an '04 RX-8 with around 30,000 miles. The car runs great, but it's probably time to replace the coils. The price with discount at AAP is only around $90.

I wouldn't worry about it, the updated coils die just as fast as the older ones. And the store bought brands won't be copies of the updated coils.

Thanks. I ordered the AAP coils and will just be prepared to change them out every 30,000 miles or so.

One of my OEM coils failed at less than 20K miles, so you might want to be prepared to watch them as they approach that interval.

I must be one of the lucky ones. My 2009 has almost 50,000 miles on it, and the coils are still fine. I should probably replace them preemptively soon.

Can you define what "fine" means to you?

https://www.rx8club.com/series-i-tro...-plugs-234383/

Me too, I just did my S2 on it's original B Coils today (first time) at same mileage and although they were fine, I did them as a 'safety' measure too, renewed my Denso racing plugs (had done about 28K) and a little dark but looked good, better than my original install NGK's (for me, the Denso's had none of that milk chocolate caked on crud)...I will keep used ones, just wanted to have a look and I thought new Coils, new Plugs I had in my new parts stocks.

Leads/Wires looked fine (almost brand new externally) and I know that is not the proper way to judge/test them...IMO Leads get changed too often.

Did a full service and a recondition charge of my original almost 7 year old Panasonic Battery as my RX-8 was off the road for almost a year while using my NC.

Anyway she fired up for the first time like it was new, actually faster than my NC.

The 4 old Coils, not a mark on them (not that this is an indicator).

As for owners having one faulty OEM Coil early on in cars life, well I have not heard of very often, in fact I think this is the first time I have and I guess like anything can fail.

All good...now to enjoy my 8 during winter here in OZ.

I did not feel or notice anything wrong with my original s2 "B" coils at 30k and a little over 3yrs, but after changing them my dyno plot looked much better. This was not a back to back test, so it could have been something else, but coils were the only thing that physically changed on the car.

The replacements were "c" even though they had "b" on the box. After almost 2yrs and 20k I did not notice anything wrong with them (including in my butt dyno and straight line speed on track). I was planning to dyno them in the next couple of months to see how they had held up, however, now that my engine is out I am replacing them. The replacements that came though a US dealer are "c" coils again even though "c" is not on the box. I'm slso doing plugs and leads at the same time (I did not do leads last time, so they were still original).

One thing I noticed - one of my plugs has a corroded top. There was also one with a corroded top the 1st time I changed them. Seems a little odd to me so hopefully new leads helps. The plugs overall look like I left them a bit long as well (~22k and 2yrs).

After all this, I'm thinking that 1yr/10k on plugs, 2yrs/20k on "C" coils and 3yrs/30k on leads is a pretty safe maintenance schedule.

I've also ordered coils for our Civic Si - it is on the original ones after 7yrs and 94k, but it seems to be knocking more than I remember now so hoping this helps.

The one that failed on me was the trailing on the rear rotor. I noticed a slight change in performance, pulled the plugs, and found a wet one. I tested that coil by swapping it to the other rotor. The problem followed the coil, which ruled out the plug and lead. Rather than play Russian Roulette with replacement coils, I just opted for a BHR setup. No problems with that so far.

The improving/internal updates of OE Coils from S1 have seen a better life.
There have been 4 iterations from 2004MY.

Understood. My car is a 2011 that came with Rev B coils.

I have been noticing that my RX-8 doesn't seem quite as fast as it should. Usually that goes away with new plugs (which were done right before garaging it last fall), but this spring it's still feeling slower than it used to. I guess I'll be looking at replacing the coils soon. I also need new tires, and will almost certainly have to replace my brake pads after my first track day this Saturday. Ouch.