not a record but not bad - two years ....

 

thanks glyph!
nevermind on my previous post.

though i'm not really comfortable reading fractions... higher resistance for the platinums vs. iridiums are higher resistance nonetheless!

i guess i've answered my own question upon someone's help on this bit of info.

i guess for the price... the only way i'd do this is to run a new set EVERY year!

i'd like to know how these plugs hold up to 9k rpm repeatedly. please post at the slightest sign of misfire please. this may make or break my purchase for plugs next year...

thanks
edit:
p.s. i see no way around the cost... but i can honestly see the oem rx-8 plugs as upgrades for the rx-7, with cost not being a factor for any loving FD owner. but the other way around, i'm very very skeptical. will the higher heat and resistance spell disaster for our coils?

 

heat is a big problem for our coils. same thing for plugs.

but no choice, thats the way it is.

 

Make sure you use shims on the trailing plugs...the RX-7 trailing plugs are longer than the RX-8 trailing plugs...and can bottom out and distort the housings

 

I used the rx7 plugs for the whole summers, that is with about 6 track events. Worked great. Just when the weather gets cold here. My car started to have hot start problems. Car will flood, and can't fire ONLY when engine is hot. When it's cold, starts like normal. So, i put my older rx8 plugs in there for now. Hot start problem is gone. Two of the rx7 leading plugs looks pretty carbon up, i dont' know if that's the problem with the plugs, or the change of weather. The trailing plugs looks like it burns really good, nice brown and no carbon or **** on it. (I do have the shims for the trailing plugs, i don't know if it works without shims)

Now i have some rx8 plugs coming, but will try rx7 plugs again.

 

^^ thanks for the insight dmak,

and for the same reasons and some that you stated, i will not use RX-7 plugs UNLESS i have an emergency.

BUT, our RX-8 plugs really do look like something the 7 guys can upgrade to.

 

Okay question about spark plugs. With a turbo rx8 should I use all trailing "9" Platinum NGK Trailing Spark Plugs? Or should I go with rx7 spark plugs?

 

Nope.

if u ask me Im gonna get the HKS plug. Its 2 steps colder than stock leading plug (9vs7 and 11vs9). Thats around the right temp for turbo application.

I never trust RX-7 plugs.

 

I'm running the RX-7 BUR9EQPT in the leading and stock RX-8 trailing plugs

I think a few of us are doing that.........

 

Exactly... I even run the RX-8 Iridiums in my 10th Anniversary Edition RX-7 on the leading.

See even the platinum plugs NGK (BUR7EQP) wear out way too fast on the leading position. By 10K miles they are shot, heck after 5K miles they are already starting to round (the center electrode should have a sharp edge for the best most powerful spark).

Vs 30K miles for the Iridiums.

Iridium is a metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200=F higher melting point than platinum and conducts electricity better.

There is not a single reason to cheap out on spark plugs. Cheaping out on spark plugs is like using 30wt oil because you are too cheap to buy 5W30 or 20W50.

 

Problem is getting cold heat range Iridiums for the leading...that don't cost $50 or more

 

so you want colder than the NGK RE9B or Denso IRE01-31? Both of them are two steps colder than a RE7C

 

Actually the ones I want are the racing 10 heat range ones that are $50 a pop.....

 

HKS has them, 40 bux a pop.

 

You guys get me the part numbers and I will take care of you like I always do. BTW, Dan, I have special bearing for you.....

 

wats the deal with the shims on the trailing? necessary or not? is it a generic part u could get at most parts stores?

 

The "deal" is that rotary plugs have always been 21mm reach...... until the Renesis, that is. The Renesis uses 19mm reach plugs on the trailing side now. as such, to use the older 21mm plugs in the new 19mm trailing side requires a 2mm shim to keep the FD plugs from bottoming out on the housing and possibly causing distortion.

 

ok thanks. i bought the older fd plugs, now i jst need to source two 2mm shims.

 

Mazsport used to have them but BHR may be able to provide them thx to a forum member.

 

are they basically just a 2mm thick washer? something that simple i think i must be able to findd somewhere in town

 

so let me get this right, only the trailing need the shims? and leading are just as is?

 

I have a bare housing and I screwed the rx7 trailing plugs in . Guess what - they don't need the shims .......

Flame suit ready

 

Pics or it never happened
This is interesting to hear though.

 

CMON PEOPLE!!!i need more facts and opinions, no need to start a new thread...

 

well i used to have all t plugs on the car, thats how scott put it. and i just changed it to 2 t plugs and 2 L spark plugs... and i have the greddy turbo kit and is running very very nice