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Hi guys,

I had my R34 GTR tuned on Friday by Anthony Rodriguez and at the end of the tune one of the intercooler pipes has come off fouling the spark plugs as the power fc was convinced the car was running 15psi at idle lol. Anthony has suggested I get plugs with a gap of 0.6mm as currently under hi boost levels the spark blows out. The cars done about 100,000 clicks and still has the standard coil packs, could this be a factor? Obviously don't want to get a set of ngk iridiums and find out this is not the issue.

Prior to this the car ran 345awkw with ah pair of 2860 -5s which I was quite impressed with especially in the tropical Darwin heat, will post when dyno sheet arrives.

Unfortunately he didn't get a chance to dial the cam gears in as he ran out of time so they're still set at 0. Is it worth adjusting it myself without it being on the dyno or should I wait til I can get it on a dyno again which might not be for another 6 months as its almost impossible to get use of the ONLY 4wd dyno up here.

Was very happy with Anthony, very approachable and happy to answer any questions I had as well as gaining an extra 50awkw without changing a single part, while reducing timing by 8 degrees.

EDIT: I've just confirmed the existing plugs are 15,000km old and are NGK IRITOP7, Iridiums obviously...

Edited by full_stick
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Why would you buy Iridi anyway?

Coppers all the way, all the time!

But yes, if 0.6mm is being thrown around then it certainly sounds like you need to change coil packs mate. The R34 setup is not the greatest either.

Ok sounds like the coppers are the way to go. I've read the numerous spark plug threads and have only further confused myself, could anyone (R31Nismoid) suggest what type of plug, brand/model/part # or whatever necessary and where to buy them from???

Sorry to be a pain but I've read all 13 pages and really didn't find the answer to my specific situation as the majority of posts were regarding RB25's. I understand the basics such as smaller gap size allows me to run more boost without the spark blowing out and the reasoning behind temperatures but still don't know what temp range I should be going for.

I believe there were no issues with the NGK Iritop7's until the intercooler pipe came off so I the 345awkw was achieved with the NGK Iritop7's which I believe to be gapped at 0.6mm but don't quote me on that. I'm running approx 18psi so what heat range and gap would be suitable in a copper plug???

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