Your Tiggo is the older model? If yes, then it is the 4G Mitsu engine.....

The iridium are around RM150 and above. I doubt the improvement is worth the amount paid for.
You can try Platinum which cost much less

Platinum Fusion or the 4 points ones. The normal platinum is cheaper then the Iridium.....

Yes, if you have the cross reference correct......



This post has been edited by vr2turbo: Nov 7 2011, 03:10 PM

My wife's Tiggo is still new so I have not open it up before also......as still maintained by the SC....

But I got this result in another forum....
Factory install : Bosch FR7DTC (Triple earth electrode)
Some alternatives
BOScH FR7DC, FR7DCX etc
Denso K20PRU-11,K20PBR etc (normal),IK20 (Iridium), VK20 (Iridium/Platinum)
NGK BKR6E-11

This post has been edited by vr2turbo: Nov 7 2011, 03:11 PM

I also search Bosch website and they have 2 and 4 electrode but not 3 also?

Was mentioned 3 electrode by bro. scorgio and was in the website also, but in Bosch website don't have, maybe discon already.....

Wonder why Conti uses 3 electrodes? My friend's ZX using the Valeo also 3 electrodes.....

Got take pic of the plugs? Oily or sooting?

On my VR, I have run on Iridium, Platinum, Copper, Normal all also can run.....

For the cover, pull from the front part? I remember you mention have to flip it up?

The plugs looks okay. The tip got no oil. At the side could have come from the top. Any oil stain on top of your engine block?

Okay, will try to open, as I have not open before. Wanted to clean the engine but cover in the way.....

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Added on November 21, 2011, 10:59 amTo me, not worth the investment. Some mention smoother pick up with Iridium but they cost RM150 or more per set.
Probably you can try a set of platinum first. Different material are actually more for durability, means like using platinum will last longer then using normal plugs, and Iridium even longer. Now they even have Iridium tough.....
But then using cheaper plugs you can use many sets so back to square one......

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Added on November 21, 2011, 11:00 amBosch Super 4 should be copper core......

This post has been edited by vr2turbo: Nov 21 2011, 11:00 AM

Yup, should be. Try cleaning around that area, but with the plugs on, in case some dirt fall inside.

If internal problem the plug tip will be oily......

You only change the plugs, so better monitor for a while.....

Have to see how your look at it. Different materials are more for durability. Then there is also design. Each brand have their own design and have said their is the best but there are no actual comparison done.
If you look at the normal plugs. One curve ground electrode over the center one. In a single cam engine these plugs are mounted at an angle therefore the spark is slight more opened towards the head of the piston. In a twin cam engine these plug will be directly on top, then the spark is actually shielded by the ground electrode. That is why Split fire mentioned for this area their design with the split ground electrode plays a part. The spark now is direct towards the piston head. I think NGK have one plug with V cut on the center electrode. Denso design is the U groove on the ground electrode. These two design is to move the spark to the side so that the ground electrode will not block the spark.
Then now come to your 4 ground electrodes. This design do not cover the center electrode but are at the side, therefore the spark is more open. Moreover with 4 grounds they can spark to any, therefore said to be more efficient.
There are many more, like iridium and platinum saying with the smaller diameter center electrode the spark is more concentrated. And the list goes on. So you have to find out which works best for you......

This post has been edited by vr2turbo: Nov 22 2011, 08:17 AM

Like what 2hp, hardly can feel but on dyno will show.....
If you read most of the sparky websites, I don't think this is even mentioned....
Most will ask you to change accordingly to the right heat range......

This post has been edited by vr2turbo: Nov 22 2011, 01:46 PM

Found one webpage on it. Denso mention improve 0.5ps. This website mention Iridium increase by 2.9whp which is not bad, but still can feel much in daily drive....

Yup, the main feedback is smoother acceleration.....

You running on twin cam? If yes, the open design of the platinum fusion has a more direct spark down to the piston top

Cannot bend back??

I have to be careful too then......

Based on design, then Bosch......

That was what I meant, the super 4 design has an open center electrode, with 4 ground electrode at the side. Spark can come from any of the 4 ground. If driving twin cam engine, plug tip is open directly in the path of the piston head, therefore getting combustion.

Denso Iridium has 0.4mm center electrode, and NGK I think is 0.6mm/ Denso claim the 0.4mm smaller sharper tip, collects or concentrate all the spark together giving a stronger spark.

The above are all claims by their respective spark plug company/distributor......

I won't spend that kind of money on iridium plugs. Have used them before and actually I find them the same.
I would say the different makes of material is more for durability. Iridium being the hardest last a longtime, the platinum, then copper and so on. Platinum can be considered as they cost around RM70 (I think) and Iridium are doubled that.

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Added on December 4, 2011, 8:36 pmWah! that is a good one.....

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Added on December 4, 2011, 8:38 pmWhat? 10 years never change the plugs? I wonder if the plugs are now fused in to the engine already?

This post has been edited by vr2turbo: Dec 4 2011, 08:38 PM