Spark plugs

I wanted to see what type of plugs are the best kind for daily and sometimes performance. Btw, are they hard to change and how often should they be changed? thanks!

 

NGK one-step colder, yeah they're a pain to change, i'd say on stock boost every 40K miles

 

NGK copper's BKR7E's (i think)

Change every other oil cahnge and its not that bad to change!

 

Ok cool. Ill see if Napa carries them. thanks

 

wow, that's a lot of spark plugs every 6-7K miles:eek3: seems like overkill to me


if you had 100,000 miles on a car you would have to change the plugs over 16 times........it's not a weed whacker

 

autozone carries them if napa doesn't....

 

Copper plugs should be changed more often, like every 10k miles...but every other oil change is a little bit excessive.

 

agreed, but copper isn't the best way to go with a car that runs boost, correct me if i'm wrong...

 

Denso one step colder FTW. Here is the link.

http://www.sakarimotorsports.com/catalog/index.php?manufacturers_id=59

 

well theres a lot of review. I know at Autozone there isn't a variety of plugs for that vehicle. but I did hear that napa carried some good ones.

 

wtf, ive got 52k on my original plugs...is my car gonna kersplode!?

 

^^^lol i just hit 60 :hsugh:

 

yeah people change their oil and plugs too much

 

I found my one step colder ngk's at Napa.

 

whose running copper, and whose running platinum or iridium?

does iridium really conduct as well as copper, but last longer?

 

I would assume that iridium would last longer than copper but not sure.

 

i had always heard one step colder's weren't necessary unless you were running higher boost. and otherwise coppers were the best option

 

I run coppers one step colder. You can find the NGK BRK7E plugs at Napa.



OP, what year is your WRX?

 

i believe he has an 04 sti.

 

Copper is BEST for performance but their life is not very long. Recommend 30k change interval on NORMAL street cars.

However, under boosted applications, 15k MINIMUM recommended service interval. Every OTHER oil change is actually best.

For racing applications..change them when you change the oil...which is like, after every event.

Plat/Iridium has much LESS performance vs copper when new, however, the Plat/Irid plugs have a much much MUCH longer life.

100k miles on N/A cars. 60k on turbo cars and higher performing N/A cars. Again, under normal street use. On performance oriented SUBARUs, 15k~30k intervals depending on setup and driving style.

At $45 a set, I'll pass on the Plat/Irid. At $5~$10 a set....I'll take coppers.

 

are the stockers copper? is there any record of failure (busted casing, etc) with copper?

 

Stock is platinum.

Failures come from installer error. I've only busted one plug...and that one was on its way out anyhow.

 

stock on my 06 was iridium, we did a cross-reference on the plug at the store when we pulled one of them out

 

well, I take that back. The 2.5 turbo and the 2nd gen EZ30D are IR. The WRX, EJ25D and the EJ253 VVL is plat.

Either way...copper changed often is best for performance.

 

ok, Well I'll try copper first and then iriduim. Try to run them both and see which I like better.

 

NGK copper one step colder plugs are what I've always run. Should the gap be changed for modified cars?

 

yea that's true also. I'm not sure if the gap changes if the car is moded.

 

stock gap on sti's is .028 - .031

 

I recommend 0.024~0.028

 

I run .028 the BK7RE's!

They come pre-gaped at .030