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The mkiv Supra Owners Club

Double Checking Reguarding Spark Plugs


terribleturner
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Now before you start i have searched and i'll i could find was where and who sells them.

So when i bought my j-spec sup it had already had new plugs put in, IK27's. Im now running a double decat (+restrictor ring), fcd, Boost Ctr and induction and i just wanna check that these are fine. The threads that i found usually indicate 24's, but there were a couple sugesting 24,25,26 and 27 were available. I know i need colder plugs, but what does the actual grading mean?? Is it like 27 are the coldest?? Any advice always greatfully recived :upside:

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If you're going to the trouble of taking the plugs out because you suspect a problem you might as well put a set of NGK BCPR7ES in there. They're only about £10 for six.

 

Folks used to reckon those Denso Iridium plugs were good for like 40,000 miles or somesuch. I've noticed that people are not raving about them so much nowadays and just going for the much cheaper NGK plugs. Of course you have to change them more often.

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I still rave about Denso's. I think they are worth the money and the peace of mind. Obviously though when it comes to tuning different people get different results. I would have thought IK27's were too cold for a car that's only BPU.

I'll be sticking IK24's in shortly...

James - if you replace the 27's can you send them to me to "test"? Assuming they aren't buggered?

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