hi
Lately, i am just wondering about the sparkplugs combinations.
i have a turbo, and these long time, i have been using RX7 plugs, all of them, but out of curiousity, is it better to use stock RX8 sparkplugs for "trailing" and RX7 sparkplugs for "Leading"?..so in otherwords:
is it better:

a) RE9B-T (stock RX8 sparkplugs) for trailing and BUR9EQP (RX7 Sparkplugs) for leading
or
b) BUR9EQP (RX7 sparkplugs) for Leading and Trailing.

i am just wondering?

 

Go with B.

I have some in stock and is what I use on my car.

 

My understanding is that the stock Rx8 trailing plugs are already a 'colder' plug and work fine for boost. Though that is jsut what I've gathered from the few posts on the subject.


I've only swapped my leading plugs so far, but have two extras should the vote lean towards all 4
They have to be shimmed to go in our trailing dont they?

 

Correct Trailing needs to be shimmed

 

it's a good information, thank you guys..
oh, fluid, thank you for the coils, it was fixed. it was the coil, and i fixed the ground. thank you
steven