neit_jnf

iTrader: (17)

History:

I bought the car with these, they were changed at the 30k miles service and I bought the car with 34k or so a year ago. It was completely untouched, all stock.

These spark plugs started in a stock car and have been through 12500 miles, including 3 long road trips, one flodding, bolt on performance upgrades, 3 dyno runs (315 ), one track day (IIRP) and one autox day (both at the Revo), 2 more autox'es, several (2+) club meetings to drive the twisties, 2 dragstrip runs, one drift day and a couple high speed highway runs...

I replaced them with RX-8 NGK Iridiums 9's all around

Here are the pics, I don't know which is front or rear because I got them mixed up.

Leading:





Trailing:



What do you think?

jack_arss

i cant belive your car ran so well with those in it! did it break up at all at high rpm on the dyno?

neit_jnf

iTrader: (17)

no breakup, maybe the twinpower helped.

2FAST7S

the first leading one looks pretty worn out! the electrodes dont seem too worn out...i'd be more concerned with the ashy buildup but then again thats not that bad either.
Look up how to read the plugs, Haynes manuals have it on the back of their manuals. I'm not sure but i think the ash buildup is normal and my have something to do with additives in the fuel. I run 9s all around and most of the time when i change them they look like that(mine have a bit of carbon on them though - oil from the turbo i guess)

slpin

iTrader: (9)

you taught us a great lesson

check the damn plugs

scotty305

iTrader: (2)

They look pretty worn. Does the car feel different with the new plugs?

-s-

PS, photos of other people's spark plugs can be found here:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/post-your-spark-plug-photos-here-417119/

WaLieN

Wow, the leading plug on the left really looks like it had its trash jacked.

ericwarren

i'm assuming you now have roughly 43k on the car....
the big question in my mind is, are you sure they were changed at the 30k service?

potatochobit

iTrader: (1)

i took my plugs out the other day and urs are much worse than mine and i have over 20k on them easy lol.

neit_jnf

iTrader: (17)

I have all the maintenance and repair receipts from the previous owner.

And yes, I have about 43k on her now.

neit_jnf

iTrader: (17)

I cleaned these and put them back on because since the change my car won't boost. i'm trying to figure out the problem

razorback

jesus, those are pretty messed up. what finally made you change them?

neit_jnf

iTrader: (17)

car was running perfectly fine, I was reading about how quickly the plugs get worn and since I've been running her hard I decided to replace them...

razorback

you said since you cleaned them your car wont boost? if thats the case i have like 4 sets of older plugs (were on my t2, very low mileage, not even 50 on one set) i could ship them to you for cost of shipping, (4 bucks) if you want to try those see if your car boosts?

neit_jnf

iTrader: (17)

thanks but it's fixed now. something caused my car to go into limp mode, I reset the ecu and all is good

JaNusSolSumnus

Yea, thats pretty amazing the way those plugs are. 12,500 is a lot of milage IMO for a rotary, amazed the other three lasted as well as they did. BTW Nice numbers, if you dont mind me asking, what sort of bolt ons were used on the car?

My plugs are changed every 2k with the oil if I can help it... kinda funny when I leave the dealer with 5 oil filters + drain plug washers and immediately head over to the Autozone to buy a stockpile of BERQ7/9's although I think once my engine is complete I'll be running 9's all around.

scotty305

iTrader: (2)

Spark plugs are pretty cheap man, I'd really recommend replacing those ones. Compare the flat edges of the electrode on a new plug, to the rounded-off ones in your photos:





-s-

neit_jnf

iTrader: (17)

Don't worry they're getting replaced, I just put them back to troubleshoot why the car wouldn't boost (it wasn't the plugs, it went into limp mode for some reason). I have NGK Iridiums 9 all around to replace them with.