Hello Guys,
Today i check my spark plugs after one week of use after speed density conversion on my Evo 8.
All spark plugs show strage signs .
I attached pics.
Any suggestione ? Too much timing? Top cold grande ?

Thanks

 

https://www.google.ie/imgres?imgurl=...act=mrc&uact=8

 

My old BPR7EIX with MAF config was clear without signs.
Same fuel and ign map.

 

BPR8EIX are for big turbo and high boost and are obviously running too cold for your setup. It also looks like you are running slightly too rich because of the black unburned fuel (soot) building up on the tip of the threads.

 

Hello... I know that I run rich (11-10.8 at 7200 with 1.4bar of boost).
The two signs on top electrode are strange...i have 4-5 series of spark plugs with MAF and was all perfect.