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o2bfit

Spark Plugs For 300gt

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Can anyone please tell me whether you can use the NGK LFR5AIX-11 Iridiums as a replacement for the VQ30DD stock LFR5AQP?

NGK list this plug as a direct replacement on the VQ25DD and VQ35DE but not the VQ30DD.

Thanks

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  • Looks like Denso use the same plugs for the VQ25DD, VQ30DD and VQ35DE.

    Thanks

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    Looks like Denso use the same plugs for the VQ25DD, VQ30DD and VQ35DE.

    Thanks

    Hi, I got my plugs from Andrew at Kudos Motorsport here on SAU. Genuine Nissan plugs (NGK) at a great price.

    Make sure you're getting the right ones.

    Cheers

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    If you do the crossreferencing like O2bfit has done, you would go:-

    NGK LFR5AQP (Platinum 4 tips) => DENSO IKH16 / VKH16 then => NGK LFR5AIX-11 (Iridiums)

    the later NGK's being a fair whack cheaper... I'd pose the qn to NGK, the only difference is maybe the Iridiums would need to be changed more regulary??

    Just curious, at how many km did you change plugs or recommended to change at?

    Cheers

    Not sure on the NGK but here is the Denso spec link

    http://www.globaldenso.com/cgi-bin/global/...p;action=search

    Regards

    Mark

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    Just spoke with NGK Australia. Although they list a LFR5AQP, they do not stock it. And they said there is no 'equivalent' plug in the range. Interesting as they also have a LFR5AP-11 plug available... would love to know what people have put in their VQ30DD motors ... and what they gapped them to?

    If you do the crossreferencing like O2bfit has done, you would go:-

    NGK LFR5AQP (Platinum 4 tips) => DENSO IKH16 / VKH16 then => NGK LFR5AIX-11 (Iridiums)

    the later NGK's being a fair whack cheaper... I'd pose the qn to NGK, the only difference is maybe the Iridiums would need to be changed more regulary??

    Just curious, at how many km did you change plugs or recommended to change at?

    Cheers

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    Hi, I got my plugs from Andrew at Kudos Motorsport here on SAU. Genuine Nissan plugs (NGK) at a great price.

    you could buy them in Nissan as well, the price isn't expensive, it's just spark plugs  :yes: too much worry about that

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    If you do the crossreferencing like O2bfit has done, you would go:-

    NGK LFR5AQP (Platinum 4 tips) => DENSO IKH16 / VKH16 then => NGK LFR5AIX-11 (Iridiums)

    the later NGK's being a fair whack cheaper... I'd pose the qn to NGK, the only difference is maybe the Iridiums would need to be changed more regulary??

    Just curious, at how many km did you change plugs or recommended to change at?

    Cheers

    The stock plugs are supposed to be good for 100,000km. Had mine checked at approx. 95,000km during a minor service and the mechanic said they still looked fine.

    New plugs going in at next service.

    Make sure they look like this below. NGK LFR5AQP

    post-2524-1278669693_thumb.jpg

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  • Sorry for dragging up an old thread but it didn't give a defiinite yes or no to the question. Has anyone used the LFR5AIX-11 in their 300GT?

    NGK gave me a very reponse to my question on the replacement

    LFR5AQP is a 4-ground electrode plug with a 1.70mm spark gap.

    To go to Iridium the only option is a single ground electrode type plug.

    LFR5AIX-11 is the best option we can offer. It has the same thread dimensions, however is a single ground electrode design plug with a 1.1mm spark gap.

    The only issue is the projection of the plug into the combustion chamber.

    LFR5AQP had a total projection from the end of the thread of 3.5mm.

    LFR5AIX-11 has a projection of 7.1mm, meaning it will protrude into the cylinder an extra 3.6mm.

    Does this give enough clearance?

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  • Just to close this off for future reference; I contacted Nissan Japan and their response was to only use the LFR5AQP plugs in the VQ30DD.

    Concerning VQ30DD engine, high-pressure air-fuelmixture is injected

    directly into a cylinder, and the stress of a spark plug increases

    accordingly. We performed durability test with specified plugs.

    We do not recommend you to use other plugs than designated ones since we

    are unable to guarantee the performance and safety.<br style="mso-special-character: line-break;"><br style="mso-special-character: line-break;">

    Edited by o2bfit

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    Don't want to make a new thread, so just wondering if anyone actually uses the LFR5AIX-11 for their 300GT? The price for 1 of the LFR5AQP which I can only find from Nissan is the price for 6 of the LFR5AIX-11

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