Quote:
Originally Posted by Jordo!
^^^ I'm really just speculating.
My old 11.5:1 2ZZ took IK20's -- although, it only made about 180 at the crank.
I can only assume the 24's clean up under load -- irridiums have a pretty wide range they operate well under, don't they?
You're proably right about it being tuned to run relatively lean at low load (and maybe even during cold enrichment) -- I think this motor is considered ULEV.
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Actually iridium-tipped plugs have really good anti-fouling properties because of the fine tip size (among other things I'm sure).
It's just really odd to me how the 370Z comes with the same plugs included with (essentially, minus the double iridium config and tighter factory gap on the GTR plugs) a boosted engine (the VK38DETT) that makes 40% more specific power.