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Thread: Iridium spark plugs, are they worth it??

  
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    Iridium spark plugs, are they worth it??

    He folkes, my coupe 1.8 & my dads VXR are both up for service soon & was wondering what Iridium spark plugs really do?

    Is it worth spending the extra £'s to standard VXL ones for either car?
    Astra Coupe - Linea Rossa

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    alchester's Avatar
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    Dam that is weird! I was just about to post up the same question regarding my 1.8 Coupe!!

    Al
    Black 1.8 Coupe

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    Quote Originally Posted by alchester
    Dam that is weird! I was just about to post up the same question regarding my 1.8 Coupe!!

    Al
    Wow seriously weird eh! lol
    Astra Coupe - Linea Rossa

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    Surely somone can help?
    Astra Coupe - Linea Rossa

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    I fitted them (because I got some NGK ones for £20 - I wouldn't have paid £45-50 like the full price) and TBH haven't noticed any difference.

    Ffoeg visually compared the standard Vx plugs to NGK ones, and found that the spark point was further back inside the block on the iridium ones, and based on that would mean the Vx would give you a better burn.

    However there are other reasons for using iridium plugs, other than performance. If you have a highly tuned engine and are running 99RON (or higher) fuel then it can be prone to premature detonation. Having a smaller electrode (as Iridium plugs do) goes some way to prevent this, so it doesn't actually give you more power, but stops rich fuel from losing it.
    0-60 in 6.5 secs and 48mpg- winner!

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    Those plugs I compared were 2.2 ones tho, which are a different type to all other astras. So it may not be the case on others.

    I noticed no difference when I put them in, but noticed a difference when I took them out and went back to OE tri electrode ones

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    theyre for high compression turb's i think????? they give a stronger spark when under heavy loads, more suited to your dads vxr, but not your slow 1.8!!

    MK4 1.8 16V Sport and MK5 CDTi Estate




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    I fitted iridiums on my Zlet and it did seem to smooth out the power delivery a bit, but i couuld not say that they actually add any BHP/torque as the plugs that came out looked pretty grotty (even though VX said they changed them in the services 500 miles previous)

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    Quote Originally Posted by pardoe16V
    theyre for high compression turb's i think????? they give a stronger spark when under heavy loads, more suited to your dads vxr, but not your slow 1.8!!
    You cheeky git, if I remember right my slow 1.8 is much faster than yours! & you now drive a diesel estate old man! lol

    Thanks for your help guys, think I may just stick to standard VXL ones for mine & just get my dad a set of Denso ones for his VXR.
    Astra Coupe - Linea Rossa

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    Quote Originally Posted by Linea
    You cheeky git, if I remember right my slow 1.8 is much faster than yours! & you now drive a diesel estate old man! lol

    Thanks for your help guys, think I may just stick to standard VXL ones for mine & just get my dad a set of Denso ones for his VXR.
    hook line and sinker!!! lol

    MK4 1.8 16V Sport and MK5 CDTi Estate




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