I pulled my stockers out around 15k and they looked bad, couldn't afford the iridiums so I went with NGK BPR7ES's gapped at around .025 to .026. Occasionally I would get some irradic boost activity. I just put in some BPR8ES's today and read somewhere, can't remember where and can't find the post right now, to gap them at around .030 and my boost is acting crazy like. Is there a reason this would be happening. Could someone give me a definite number for the gapping, just can't seem to find any kind of concrete answer through my searching of the forums.

Thank you,
mitsuorder

 

I gapped mine at .028 and mine ran fine. I used both the 7's and 8's.

 

thanks WILDMAN, have you ever heard of erratic boost behavior from over gapping?

 

Most turbo cars dont do well with either iridium or platinum plugs, get copper and change them every other oil change. You want to get the gap down to the lowest you can go without a misfire. About heat range i would stay with stock unless you are highly modded then you would probly want to go colder. None of this is evo specific so if i have said anything that seems wrong to the evo experts just correct me. thanks.

 

cool, I am tediously gapping my copper NGK BRP8ES's to .028 right now. hopefully that will be ok in combo with 1.4 bar of boost, I appreciate the input along with any more.

 

I run stock plugs

 

Yeah I totally would too Al but just can't spend that on the stock iridiums.

 

gapping should be between .028-.031

 

whats the price on the stockers???

 

$27 each from

copy cat
be original

 

ya we've met before dood, whats up?

 

I'm 11921 your 12118

no beef, Just want you to know how had it first. I think before you said you wanted to race? Any time you pick, the beater or the race car guess which is which

 

the stock plugs are probly not the best. wanted them to get maximun life not perform the best. I will be going to copper plugs.

 

27 per plug seems a bit steep. How much are the NGK BPR7ES and BPR8ES plugs and which one has the stock heat range and which one is the colder one again. Memory is a little cloudy right now.

BTW I'm member 2722 so put that in your pipe and smoke it.

 

GO WITH DENSO IW24's!!!! I can't believe people are still perpetuating the rumor of "copper plugs are better than iridium.." Copper are better than PLATINUM for a performance application, but the best BY FAR, especially for a highly turbocharged car like ours, is iridium. It is a better conductor, needs less current, and can fire in conditions a copper cannot. The stockers are ok, but not worth the money. They are heat range 7, while the iw24's are heat range 8. Even so, denso tends to be somewhat hotter than ngk when it comes to heat ranges, so their “24” which is supposed to be an “8” on ngk's scale, really falls at about a 7.5.

As for gapping, you want the largest gap possible without causing a misfire. I would recommend gapping between .25-.27. If running 20+ psi, maybe even a little tighter.