Iridium may last longer, but I doubt you will get double performance. All you will get is smoother drive....

Brother... Then NGK or denso is better?
Denso iridium plugs gt a lot of model (e.g.: IW24, IK24, IK22 and etc). What is the different between them?

gapping? heat range? etc etc
there's some online converter for yr current plugs to the Denso/NGK ones.

Yup, thread depth, plug size also......

So far for what I have heard, the super 4 is the best... So blur now... Don't know what should I get now T.T

depends on yr budget, and sifus comments.
for my case, after listening to all the comments, i got myself iridium with the correct gapping.
most important is to match back to the original one, or u may want to change some settings (eg heat range) to get certain improvement.
however, don't know about u. but i prefer to be on the safe side.. use back original recomendation.

Never change the heat range unless you have problems or you have mod the car kao kao. One step like 100bhp up....

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Added on December 5, 2011, 3:53 pmDifferent brands have different design. All will say theirs is the best, so you have to read and find what you want....

This post has been edited by vr2turbo: Dec 5 2011, 03:53 PM

I think I want to choose iridium plug... Any iridium plugs can introduce? My engine is Magma 4G15 carb...

Try Denso then. Change accordingly using their conversation chart from your current model.

From lelong, they said IW20 or IW24 suitable for my engine. From the Internet, they said IW16 suitable for my car... Blur >.<

Before buying any iridium or platinum spark plugs, do ensure that they are double platinum/iridium, meaning both the center electrodes and ground electrodes are platinum/iridium tipped. There is no point getting normal platinum/iridium where only the center electrodes are platinum while the ground electrode gets disintegrated.

As far as I know ground electrode seldom wears, as for platinum and iridium center tips, they are so hard they will last.

It is the ground electrode that wears out the plug. The spark fires from the center electrode to the ground electrode. It is the ground electrode that gets blown to bits. I have seen that happen on my single iridium and platinum plugs after 20000km in my previous car. In my current car, I wear out the NGK Double Laser platinums (which is the recommended stock plugs for my car) at about 50000km.

This post has been edited by sleepwalker: Dec 6 2011, 11:31 AM

But NGK din mention which plugs suit which engine bah... Scare after get the most expensive one but no suit your engine, it's meaningless.

My car manufacturer mentioned it and it came from the factory with NGK Double Plats. Also if you checked NGK they have a products finder page which you can find the recommended spark plugs for your car. They even have a local site at http://www.ngksparkplugs.com.my

There are 3 things to watch for when changing plugs,

1. Plug size/shape (no brainer, size shape can be found in part number)
2. Plug heat rating (you can find that on the model/part number, refer to ngk site)
3. Spark plug gap (which you can re-gap if the model does not have your required gap size).

The most importing thing is the heat rating which has to be the same or equiv with your OEM. So I don't see why it is difficult to find NGK plugs for you car, unless you are driving something that is not on their list.

Wah! you terror then, because in my turbo my iridium did not wear, only start to misfire after about 2 years of use.
Now on NGK platinum, after more then a year still running strong.
Last time when on normal plugs only the center electrode wears rounded.....never had any wear on ground electrode....

Ok. Now the problem is where can I get those plugs? Sabah seems like hard to find the plugs suitable for your engine.

If the ground electrode does not wear out, none of the spark plug manufacturers would bother with double plat/iridiums would they? Double plats/iridiums also last twice as long as their single counterparts which explains that the plat/iridium plat/iridium ground electrode outlast the normal electrodes. Do you use your turbo for daily drive? My previous turbo did 120k km and the current one has done 150k km and has gone through platinum and iridium plugs like nobody's business.

spare part shops don't carry them?

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Added on December 6, 2011, 10:57 pmYup, daily ride for last 10 years. Second engine second turbine also....ha! ha!

This post has been edited by vr2turbo: Dec 6 2011, 10:57 PM

I wasn't referring to second engine and second turbine.. both are on different cars. Did 120k km for previous car before selling and 150k km on current car. Both on same engine and turbine.