This is the e-mail I received from NGK: They recomment to keep with the stock spark plugs!!!


De: Jon MacQuarrie
Para: 'duked'
Data: 21/10/2004 14:29
Assunto: RE: NGK Form Mail

Hello,

The BPR7EIX will work in this application. The reason we offered this in
the aftermarket was due to the fact the IGR7A-G was an OE part only. The
IGR7A-G is a better spark plug for the application however the BPR7EIX will
work.

Jon MacQuarrie
Technical Support Specialist
jmacquarrie@ngksparkplugs.com


-----Original Message-----
From: duked [mailto:duked@uol.com.br]
Sent: Thursday, October 21, 2004 12:28 PM
To: jmacquarrie
Subject: RE: NGK Form Mail


Why I should use BPR7EIX (recommended in your site) and why I
shouldn't?

Thank you




> Hello,
>
> The recommended spark plug for this application is the
IGR7A-G stock number
> 3106.
>
> Jon MacQuarrie
> Technical Support Specialist
> jmacquarrie@ngksparkplugs.com
>
>
> -----Original Message-----
> From: duked@uol.com.br [mailto:duked@uol.com.br]
> Sent: Wednesday, October 20, 2004 10:56 PM
> To: NGK Form
> Subject: NGK Form Mail
>
>
> **** Contact Form & Tech Info Feedback ****
>
> Email From: duked@uol.com.br
> VehicleType: car
> Make: Mitsubishi
> Model: Lancer Evolution VIII
> Year: 2003
> Engine Type: 4cyl turbo
> Comments: I need to know if the NGK BPR7EIX is the same
plug as NGK/Ralliart
> RAY 66001. The photos are in my hands and they look pretty
the same
>
> Thank you
> When: 10/20/2004 10:56:29 PM
>
> END OF REPORT
>

Okay, so our OE plugs are NGK IGR7A-G, not BPR7EIX right? Sorry, I'm too lazy to go out and pull my plugs to check.

Okay, so our OE plugs are NGK IGR7A-G. I guess.

I looked in my owner manual and the stock spark plug is IGR7A-G

i read in another post that someone else said their cousin worked for ngk and that the ngk plugs that come in the car are a platinum/iridium hybrid and were better than the iridium ix plugs. i wasn't sure. i'm still wondering if there is anything out there better than the oe ngk plugs whether they are denso, ngk, or whatever.

anybody have any info on this?

bump

if you want something better than the stock plug, then try the Denso Iridium Racing plug. part number: IW01-24

Or... (and I cant believe noone has mentioned this) you can save yourself a bunch of money and just run the ngk copper equivelants and change them often. I made 500whp on a set ngk copper plugs in my last ride and I'm running them and will continue to run them in the evo. Plus, the entire set runs about 8-10 bucks.

Here we go again....

I was wondering the same thing myself so I did a side by side comparison between the OE plug and the NGK iridium IX plug the other day. It's true that the only difference between the two is that the OE NGK plug has a platinum tipped ground electrode. Aside from that, they're practically the same plug. As far as drivability is concerned, I haven't noticed any adverse effects between the two. The only noticable difference between the two plugs on my stock EVO is start-up. It may sound funny, heck, it might not hold any technical value, but it takes more effort to start the car with the NGK iridium IX plugs. 2 cranks (clicks) versus 2.5 - 3 cranks (clicks) of the starter. Performance-wise, they feel the same on the butt dyno.

On the latter note, the Denso IW22 is reguarded as a more premium plug compared to the two NGKs and it has a smaller electrode. 0.4mm vise 0.6mm. Performance wise, the smaller the center electrode, supposedly the better the spark with less resistance as compared to other spark plugs with thicker center electrodes i.e. NGK V-power at 1.1mm thick platinum center electrode.

From a finacial standpoint, the cheapest option would be platinum plugs that can be sourced from just about any AUTOZONE/KRAGEN for $9 - $10 a set.

Second most cost effective way would be the the BPR7EIX which I've sourced from RISING SUN AUTO PARTS @ $9 a piece if you're in the San Diego area or $7 a piece plus shipping from sparkplugs.com. (I bought mine from Rising Sun @ $9 while they were still offering the BPR7EIX on sparkplugs.com for $12. Now, it's cheaper even with shipping)

Third most cost effective way and second most expensive way would be the DENSO IW22 which could be had for $12 a piece from sparkplugs.com.

Most expensive option would be OE NGK plug @ $30 - $50 depending on dealer.

Speaking of which, I found out from a couple of autoparts stores that the OE NGK plugs will be exclusive to dealerships until sometime in 2005. Until such time they will become available to autoparts stores.

It's just like any other thread comparing two of the same parts i.e. exhausts, etc. etc. Pick your poison. They all perform the same task, and any plug will shine in different areas from car to car. It's just whatever works for your needs and how deep your pockets are.

Anyway, that's just my two cents.

thank you dagul. this is the info i've been looking for. i think that with that info, combined with the poll data, leads me to select the iw22. thanks.

No problem. Glad to be of help.

I was reading what the gap was on the stock plugs specs. and it said between 1.0-1.1 mm (.039-.043) in. The Denso IW22 gap is .044 and the NGK BPR7EIX is .032 . So the Denso is more closer to the specs, it should work just as fine, while the gap on the NGK is a little close. Right?

Well, if you think about it, with the denso, it has a thinner center electrode (0.4mm) so it has less resistance and can afford a little more gap to create X ammount spark where as the NGK has a 0.6mm center electrode and uses a closer gap to create the same X ammount of spark because of the added resisitance. Honestly, most consumers don't take spark plug gap into consideration when purchasing spark plugs because these things are pre-gapped. It's not recommended to even try regapping iridium plugs because of the risk of damaging the center electrode. If you read up on other threads, having a closer gap on two identical plugs is just a little insurance to prevent against misfire, detonation, etc. Anyway, ex-honda, try reading up on other threads and read about other people's experiences with each sparkplug. Personally, I went with the BPR7EIX because it was a cheaper alternative to OE plugs and Denso plugs. If you look up at my previous post, there's more info there...