N3H1-18-100A-9U vs N3H1-18-100B-9U
 

As the title implies

N3H1-18-100A-9U vs N3H1-18-100B-9U

what is the difference ??? besides the letter :)

So you know that I am talking about Ignition coils


Thanks

The B is used in Series II RX-8's and at a chassis number Change on Series I, I believe from 2007....

HOWEVER, the parts now supersede to the B, so you can use B on ALL RX-8's, ..

What is the difference?, It is internally a better/longer lasting coil.

Its the same. Meaning they still dont last very long :(

I cant recall exactly but is that a 3rd generation of the OEM coils? The switch to the 2nd generation was back in '05.

Cheers

Andrew

Production Change Points for COILS
 

Remember this is for Australian Series I RX-8's, the parts are the same here as the US..

https://www.rx8club.com/attachment.p...1&d=1235703117

N3H1-18-100 Superseded to an A at Chassis # Change JMOFE1031--104511, up to 2006 MY

N3H1-18-100A Superseded to a B at Chassis # Change JMOFE1031--105465, 2006 to 07 MY

N3H1-18-100B is still the current COILS used in production for Series II (09) RX-8's also and late Series I (2007-08 MY)

SO the new coils (B) fit all RX-8's, Mazda US have a locally sourced coils with a -9U on the end of the part number.

How do I know which coils I have? I had to order off eBay because no dealer within 100 miles of me had more than 1 in stock, and they couldn't get any for at least 2 weeks... They look identical to the ones I pulled out of my '04 6spd, but they're only marked N3H1-18-100. A few lines down they also have "AIC-1279" "4X07"

Not really a pressing issue, I'm sure they'll work, just curious.

I've sold the B before for the first generation cars. I don't recall a physical identifier other than the box had the new number on it. The A is still cheaper than the B and I don't know if there is improvement to the B.

Paul.

I keep getting the A version.

maybe next time I will get the B.

but if they superseded the part already I guess I will get a B next time no matter what.

Current coils have about 1K miles on them, brand new, A version. No more misfire. Lets see how long it would last before I see misfire.

My dealer put in two new coils today on my 2004. They were the B version.

Old Bump
 

I found some new OEM coils in my garage. They are part #N3H1-18-100A-9U. If nothing changed in the design of the coil as compared to the newer N3H1-18-100B-9U version, can I assume I could use them since they are brand spanking new?

Ash you mentioned it is internally a better/longer lasting coil, but also mention if related to a chassis VIN change. So what is the ultimate answer? Paul seems to think there is improvement to the B.

:dunno:

Necro bump
 

Just curious if over the years anyone has noticed the difference yet. The A is still cheaper, so I'm leaning towards those if the B isn't an improvement.

as of today right now, Mazda USA has no A coils, and they have the same list as the B coils anyways, $80.29 each.

I've run A's, B's and Autozone replacements. Currently running B's. I see no difference in the butt dyno, no significant change in starts or fuel economy between these B's and the A's or the autozone reps.

There may be a difference but it isn't particularly noticeable. Replacing excessively worn coils with fresh ones, regardless of the P/N is going to be an improvement over what you had.

CPT Obvious signing off.