RIWWP

iTrader: (2)

Yeah, BHR coils are considered "lifetime" at the moment. I imagine that there IS a point that they will typically need replacement, but I don't think anyone has that much mileage on them yet. With the BHR coils and wires, you will only need to replace plugs periodically now.

200.mph

iTrader: (9)

carbon maybe your not aware but gwilliams is a rotary god and has owned so many rotaries it makes charles look like a noob lol

Carbon8

iTrader: (4)

I have nothing against him, just seems the amount of ignorant information posted to people who want to actually learn is getting harder and harder to sort out from correct information.

Not saying he knows this or that, just know I have seen many posts by him that are laughably riddled with fictional content.

Nadrealista

Can you share with us which Denso plugs did you use and where did you get the info that they outperform NGKs?

gwilliams6

First everyone relax, of course I know that the BHR coils should last the lifetime of this car, and I will only be replacing the plugs around every 30,000 miles, pending normal use. My bad if you thought I would be buying the BHR coils and wires again every 30,000 miles. That said, I have used both NGK and Nippon Denso plugs for decades throughout their years of developments and improvements in my rotary engine use for both street and track applications . So there is a lot of actual experience and trial and error in my evaluations of what has worked best for the seven rotary cars I have owned since 1973. It may be pooh-poohed by many here, but having used both NGK and Denso plugs in my RX8, I prefer the Denso Plugs. I live in a four-seasons area (N J) and drive all over the U.S. from New England to Florida to Texas and California, so I have used these plugs in cold and hot conditions. I talk with my fellow RX8 owners in my area and I talk with Rotary tuners in South Jersey and elsewhere about their experiences and recommendations on many issues with their cars, including ignition issues and specifically plugs. For many of them, it was a find that the Denso plugs (listed as Iridium Racing or Iridium Power) will work fine for street RX8s as well as racing RX8s (for which they were designed) with no start problems and better high rpm performance than the highly regarded NGKs. Also many have found these plugs to be less prone to fouling despite a cooler temp rating. Take this info and use it or reject it. That is up to each individual owner to decide. I am not here to tell you what will work best for you. I have attached four links with some info on the Nippon Denso plugs for the RX8. They are easily ordered from any national chain auto store that carries Denso plugs, like Autozone, Advance Auto etc. Priced around $20 each, though that may vary less or more by region.

DENSO SPARK PLUGS
http://www.globaldenso.com/en/produc...structure.html
DENSO SPARK PLUGS - Basic Knowledge
DENSO SPARK PLUGS･ Basic Knowledge

Nippon Denso Trailing Plug- IRT01-31
Leading Plug- IRL01-27

Iridium Racing Plug
14mm Thread Size
Heat Range 27

Shock720

Thanks this helped alot

gwilliams6

You are welcome!

In addition, a longtime RX8Club moderator ASH8 ( a longtime Australian RX owner, former Mazda Mechanic and racer who drives both an RX8 and MX5) did highly recommended the Nippon Denso Plugs to me, they are what he switched to from the NGKs, and I thank him for that tip. Don't get me wrong, the NGKs are fine, but the Nippon Denso perform better that's all.

IRPerformance

iTrader: (6)

I recommend replacing the spark plugs and wires first. If the car still misfires, then I change the coils. The mazda resistance test for the coils isn't very helpful.

But Im Not Asian

Can you change 2 coils at a time or just replace them all?

Posted From RX8Club.com Android App

RIWWP

iTrader: (2)

You CAN choose to change only the ones that have failed, if you have tested all 4 to see which ones have failed and which ones have not.

However, we generally recommend replacing all 4 together, because if you had 2 fail, the other 2 probably aren't that far from failing, and you will have to repeat the process. Additionally, if you caught the coil failure of 2 in time, you are just exposing yourself to the added damage from if you don't catch the other 2 failing in time. Replacing all 4 at the same time is usually the best route to take.

patriotjj

Just wondering also If my problem is new plugs,coils, wires or just an overall tune up on my car. So I just recently got an Rx8 from a friend, he kept up with it by driving it how it's supposed to be driven, putting the correct oil in, and on time, and also putting in the gas that is supposed to take. He got a new truck, so he let his Rx8 sit for 8-10 months before he sold it. Currently has 65k Miles, I believe it has not got any tune up/plugs or coils in it previous to me getting this car. The problem is it's very slow to start, BUT starts everytime on the first try, and it is VERY slow in accerlerating, but after 1st gear it runs like a champ. Anyone know what this problem is?

dannobre

iTrader: (3)

If it has 64k old ignition I would start there. A slow starter wouldn't help either. . So if it is cranking slowly look at that

There is lots of info in the stickies in the troubleshooting forum. .. have a look there

Rx8Dizzy55

I have a 05 4spd at rx8 and one day while driving I lost power.. I took it home and the next morning I turned the car on but it took a while to start and I noticed the engine sounded weaker then normal so I revved it on park (took a while revving but still redlined) but when I put it in drive the car wouldn't move even when I floored it. I checked the cat and fuel pressure and both are good and it's not throwing me any codes or lights can SOMEBODY PLEASE HELP ME!

Sphere

Well after reading through this thread and doing massive amoutns of research on my Rx8 before and after buying her, I feel much more confident now and sure about needing new coils.

I got my '07 with 65K in absolute meticulous shape, for less then $8K. I know the dealer and do alot of business with them. They don't steam or detail engines, but this one looks as if it just rolled off the factory floor, I mean the whole car, in and out, is showroom. Of course with it having >60K, I'm concerned about a number of things. Luckily I was able to get current records from the local Mazda dealership and they informed me it had all of her recalls done and had been very well maintained.

Unfortunately there was no mention of the coils being changed, and I have been seriously eyeing the BHR set (I love this car so much). I felt like she wasn't producing as much power as she could, but with the engine looking practically brand new, I wasn't sure if it was really something I needed to do asap.

Well, after hearing mention of the coil chirp, and feeling the need to go detail her, some more...again...I started her up after doing a thorough clean of the MAF. Wouldn't you know it, I distinctly heard the chirping sound that had been mentioned. Now I'm very confident in getting them changed asap before it develops any further. I intend to continue the tradition the previous owner did in pampering her *** (and choking her at night, she loves bdsm, of course!).

She's going to love those BHRs I think.

Edit 1 - That'd be amusing if the one I now have was the one patriotjj was driving.
Edit 2 - I would love to see the red set of BHR mounted in an engine if someone has a pic.

Sphere

I have that video bookmarked for reference for when I change my coils. I kind of wish the accents wrapped around the front as well, but that's just purely aesthetic of course. Performance > looks any day.

Edit - Awaiting your reply regarding a set of coils I'm interested in too.

Sphere

Apologies, it must've been an older post where I saw it mentioned to PM you. I apologize and will get an email sent to you.

bmannie5851

i would just like to add me 2 cents. First of all hello to all my rotary brothers. Second in my time noticing about my rx8 is that it is not good to buy (non) OEM or BHR parts for this car. Just my opinion but i would stay away from coils and wiring from local parts stores, spark plugs(NGK) are fine. "Just my opinion"

GK1707

iTrader: (10)

Why would you advise that? My BWD coils from Advance auto parts have lasted me 3 years and roughly 20k miles so far and are still running solid as the day I installed em. Not a single misfire or ignition related problem on them or the ngk spark plugs and wires all purchased at Advance.

alleycat336

Now when replacing plugs and wires, do I need to get that little handy tool for the spacing on the plugs. I know non rotary cars take specific spacing. Are these one of a kind?

gwilliams6

Correct plugs for RX8s already come pre-gapped with the correct gap. Do Not adjust them !

TheRixer

Newbie - - I have a 2009 RX-8 - 40K miles. I only put premium gas in her. She has new spark plugs. Yesterday driving her on back roads - while I was driving 45 mph she all of a sudden started hesitating - put her in 2nd gear, she would not go over 25 mph - 3000 rpms - - pulled over - turned her off and she was driving like normal. Today she is hesitating - has bursts of acceleration - once I have been in her for about 15 minutes. I am being told probably her coils need to be replaced - Mazda Dealer is telling me he thinks her engine is about to go - - I would love others feedback.

RIWWP

iTrader: (2)

If you only replaced plugs and wires, replace the coils too. New plugs don't mean jack if the coils supplying them electrical current are dead. Coils fail within 40k miles easy on this car. By 30k, stock coils can have you down nearly 30whp, or about 15% of total vehicle power.

TheRixer

RIWWP - Thank you - - I have had people tell me to include two cycle oil in my gas tank - said it would run better - Thoughts?

RIWWP

iTrader: (2)

They are refering to premixing. See this: New and Potential Owners START HERE!: Premix

gwilliams6

RIWWP is correct here. I also suggest you see RIWWP's thread on coil choices. It is in his New Owners Thread if you scroll through it far enough. If you can afford them, I recommend the BHR coils, which can last the lifetime of your car and do give a slight bump in performance. Well made and well-tested. Welcome ! You are at the right place to get important info and feedback to help keep your car humming and you smiling.! I also premixed in all my rotary cars over the years.