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Thread: Spark plug upgrade?

  1. #1
    New Member a wet monk's Avatar
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    Default Spark plug upgrade?

    As I mentioned in another part of the site, greenhous have billed me for new spark plugs without actually doing the work, perhaps thinking 'the customer will never know'...

    A friend of mine has upgraded his r33 skyline to iridium plugs and won't shut up about the power gains.

    I'm under no illusion - my vectra will never compete but I wanted to know whether anyone on here had tried...



    Is it cash well spent?

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    Regular Member patch22's Avatar
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    http://www.sparkplugs.co.uk/pages/te...park_plugs.htm

    I have iridium plugs in mine,they had been in it for about 5k when i bought it after reading various write ups about them i wouldn't have any other type now,look at the link above and it may answer some of your questions

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    New Member a wet monk's Avatar
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    will the performance be noticeable? eg the k&n was supposed to boost horses yet I can't really tell the difference outside of sounding a little nicer?

    (I'm under no illusion that I'm not driving the VXR)

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    Quote Originally Posted by patch22 View Post
    http://www.sparkplugs.co.uk/pages/te...park_plugs.htm

    I have iridium plugs in mine,they had been in it for about 5k when i bought it after reading various write ups about them i wouldn't have any other type now,look at the link above and it may answer some of your questions
    Horses for courses. Patch, you have a 1.8 (according to your profile anyway), so your reccommendation needs to be seen as specific to that engine.

    WetMonk (WTF? lol) - you have the Z20NET, which obviously is a different engine, but also happens to be one that is happiest with the standard spark plug - NGK PFR6T-10G. It won't be as happy with Iridium plugs, or Bosch Super4, or any other stuff you might fit to some other engine. The only exception is if you've tuned the engine to a very high degree - remap and the bigger Mitsubishi turbo, bigger injectors, etc, then the Saab Biopower spark plugs work well. The reason the engine is fussy, is because unlike most other petrol engines, it doesn't have a camshaft position sensor to tell the ECU which cylinder is at the ignition stage of the combustion cycle, instead the ECU sends a spark to all four spark plugs at once and the one with a cylinder full of unburnt fuel and air mixture reacts differently, telling the ECU which plug to send a further spark to. Hence the plugs work much harder than in other engines, hence why an "inappropriate" plug will make things worse not better.

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    Regular Member patch22's Avatar
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    Obviously a very knowledgeable man no arguments from this quarter,main reason I like them is they seem to perform well and they wont need chaning for a long timeo

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    Fair enough, and it's always satisfying to upgrade to a better spark plug, especially as they're often (not always) easy to fit yourself; just in this case the engine is more fussy than most.

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    New Member a wet monk's Avatar
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    Much appreciated, what is this you talk of?

    Mitsy turbo?

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    All I can say is that from my experience I wouldn't bother. They cost a lot more and in my car they were in for about 10k when I started to get an intermittent emissions warning light. It did not leave any fault codes and the light only came on for a few minutes here and there. I put standard back in, no warning light since and have done another 12k miles. Also, no performance difference as far as I can tell and the originals are good for 50K!

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