Ok everybody and their mother switches over to the NGK copper BPR7ES, so after about 6k miles i pulled my stock iridium plugs out to take a look at em, and decided to drop some of the BPR7ES's in, about a month later i go to the track my best time was 13.8 at 99 mph, it was about 60 with 80+ % humidity, so im like ok whatever im just a ****ty driver, so next week before track day i put the stock iridiums in, its about exactly the same 60 with 80+ % humidity, boom right off the bat i run a 13.4 at 104, so im like wtf? so i run 3 more times, all exactly the same TRAP at 104, times varry from launch to launch, the first time i went all my traps were 99 with 1 98.89 and after i put the iridiums in i trap 104 on all 4 runs. I seem to be super consistent with my runs, i tuned for no knock on 91 octane.

So now i want to know was it the iridium plugs, cause i thought about all the possible factors of why the Copper ones made my time slower, and the possibility that i was just a bad driver the first time, but no matter what your TRAP time can not change by that much simply by doing ****ty shifts and launch really dosent change your trap time by 5 mph **** even if you granny shift vs lightning shift your trap time wont change by 5 mph. the copper plugs looked fine, even burn all the way around, nice brownish color. Why did the Iridiums make me that much faster?

 

the BPR7ES are platinum's, not copper
the stock plugs are very good plugs, but expensive. the most economical replacment are the ngk's.
also, are you sure you gapped the ngk's between 0.26-0.28. gapping is a very important part.

 

bpr7es isn't a platnium plug its copper, the "P" stands for protruding tip.

 

so what is the br7es? i was told the p stands for platnium. i could be wrong tho.

 

like he said!

 

http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

 

The NGK BPR7ES are copper heads that's inexpensive (less than 2 bucks a plugs) in which they are easier to gap than the stock plugs. I believe you can gap them to spark just as good as the the iridium ones.

 

If you like the irridiums then try the BPR7IEX NGK replacements, about $7 ea.

Lack of performance from the coppers you had were likely from lousey gapping

P is prtruding and Pless is not protruding electrode

 

Be Carefull When Gapping The Iridium Plugs!!

 

actually i had them gapped at .28, they seemed like they were super smooth through the entire rpm band, it just dosent make sense why it was that much of a time difference. infact the first pair of the bpr7es's i tried gapping at .30 no miss fires, but just to be super sure i put them down to .28. so i know it wasnt the gap.

Is there a studdy on the type of flame front the iridiums create vs the coppers? i would assume that might have something to do with it. It would be cool if somebody could test it on a dyno so we could know for sure.

 

All I can say is my spark ignition problems ended when I tried BPR7IEX's (former plugs: BPR7ES, BR7ES, and BPR8ES).

0.024" gap at 25 psi boost works fine

When gapping with those irridiums however, use the wire and avoid too much contact on electrode.

It took me about an hour to gap the 4 plugs

 

There seems to be a lot of controversy surrounding what particular plugs should be used. I recently picked up a box of NGK BPR7EIXs. All 4 plugs gapped at .026. My current mods are Apexi GT downpipe, Test pipe(3"), Invidia Catback, OEM MR compressor bypass valve(blow off valve), DJT boost controller set at ~20psi(spike to 22psi), Tuned by C-Spec(car runs flawlessly). The only reason i want to change my plugs is because i figure they've been in there for 15k miles already(oem plugs never changed, 04 Evo GSR) so i think the car could really benefit from a set of fresh plugs. Are the BPR7EIXs a good choice? Should i switch to Colder ones? Should i put in Copper plugs instead? Any advice is greatly appreciated. Ive used the search function and found quite a few threads but none say definitively which plugs are optimal for what level of mods. I plan on keeping the car the way it is power wise while adding other mods that dont affect the engine at all(mostly aesthetics). Thanks guys!

 

i run those with similar mods and love them compared to coppers. they seem to work just like the stockers but at a cheaper price. IMO you don't need a colder plug yet.

 

bpr7es works just fine and cheap, sure you have to change them more often than the stockers, but who cares atlease you know your plugs are always fresh.

 

I run the stock plugs and suggest everyone that asks me to use the stock plugs if you can afford them. For the price the BPR7EIX or BPR8EIX are the next best alternative. You are downgrading going to the BPR7EIX slightly.

You are seriously downgrading when going back to a copper plug, such at BPR7ES, or BPR8ES. The only reason to choose copper over iridium is if you cant afford irridium.

Brian