[T77911S]

good question paul, i am testing a set of W4cs plugs out of my brothers 930. i was going to post basically the same question/ results.
like you, i was using W7's. i am doing this to test detonation and fuel octane.
so far i have had good results. i am using 87 octane, before, i HAD to use 92+ or it would ping. it starts good, runs good with no fouled plugs. i pull 2 out every few days and check them and they even look good, despite they were used.
next i am going to bump the timing up a tad to see where it pings.
i have not run it above about 4200 because of a miss,( i have a 914 rev limiter in there and i think it is coming in too soon). i think i am going to end up using W5 plugs in the end.
i also have an MSD, i have set the gap as big as .065.
before i learned about about plugs, i thought hotter meant more power. if the plug gets too hot, it can ignite the fuel early causing detonation.