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Spark Plugs, Best For Supercharged Boxster ?


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Hi, question about sparkplug heat and superchargers, what to much?.

I’m installing a TPC supercharger in my Boxster tomorrow (hopefully). There’s a spark plug which will become inaccessible & require removing the blower to replace it in the future, I’d like to replace the plugs before I put the blower in.

Several people familiar with this setup recommend stock plugs, definitely not platinum. I read somewhere it had to with the heat produced and its distribution. I bought what were supposed to be OEM plugs; “Bosch Super plus (FR7LDC+)”.

The number indicates there heat index (?) a “7”. I thought I read “4” was Ideal for superchargers in this application.

Any body with experience, suggestion, etc?

Thanks, PK

P.S. my "O.E" plugs have yridium (yes, with a y) with copper cores. Iridium is supposed to be not so great either.

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The original heat index over here is 5, index 7 is to hot. Bosch and Beru use the index starting with a small number = cold, how bigger the number how hotter the spark plug is, NGK use the index reversed.

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