BKR7E, PFR7B or BKR7EIX's, pro's and con's? i was under the impression that copper plugs give a more intense spark than the other two, but don't last anywhere near as long, and seeing as im after performance over longevity, would coppers be best for my 5k a year mileage?

bearing in mind copper plugs are under 3 quid each too

 

and don't just say PFR7B's 'cos that's what everyone says

 

i sometimes use copper plugs. no disappointments yet.

 

Theoretically coppers will give you the best performance/spark but they may cause you problems as they don't last at extreme conditions (boost-temps) for long time.
Platinums are a good choice but as iridiums last more and have better conductivity I'd bet on them (I already have the STI labeled BKR7EIX in my PPP'd WRX MY03).
STI also uses them as uprated plugs currently replacing the PFR7B they used in the past.

 

Iridiums are not good, they certainly don't last and frequently fail, least thats my experience (and I would have lost my shirt if I was a betting man). Platinums are the best compromise, PFR7B's changed every 10k on "normal" mods, I have to change mine every 5k as they get very tired beyond that.

STi's are not "that" highly tuned relatively.

bob

 

Agree with Bob, I have found the Iriduims to have a very short life.

Andy

 

Hang on, you two agree?

Is 10k the "real world" Life span?

Whats all this 40k crap that gets banded about?

 

You makes me worry now!
What you mean short life 10K, 20K, 40K or what?
I had the factory platinums with no problem for 35K km and changed to iridiums recently although my car is PPP'd the last 25K km.
JIM

 

some good feedback, thanks


could you get away with coppers with every oil change running 1.4-1.5bar boost?

 

Yes.

I didn't get 3k out the iridiums at 1.8 bar before they caused a misfire, they were going off long before that !

 

set of BKR7E's just ordered 10 quid for the set

 

Would these be ok for an 03 STi?

 

Kev, where, if you don't mind me asking ?

 

they were crap, the electrode was too fat on them to get the gap spot on (.5mm), misfired worse than before, so ditched them

 

if you really want to try them i got them from my local motor factors, ordered them in for me same day

 

I used iridium's in my evo 5 @1.7bar for 10k no probs at all.

 

What would be the best choice for my scoob?


96 UK turbo with PPP