What makes you say that?
why would it be too rich? It wouldnt be too rich
and as for timing the g40 runs on the very limit of pinking, hence why it has a knock sensor
if you read the article on the forum at the front page it says so
so yes if you run under hard loads with a smaller pulley and no map too suit you *could* potentially melt a piston
however if you drive half throttle and under it wont be running on any boost and make no difference
I can't believe that a proper g40 with a good condition fuel system (pump, lines, injectors) could melt a piston. If i remember with stock chip at wot, afr drops at 11.2 (quite rich).
At the last month i was experimenting mapping my g40. I run 95oct fuel. I leaned at wot the afr to 11.5 and gave +5-6 degrees of timing and still nothing- no pinking.
Also, at higher loads (more than 0.7bar till 1) everything is safe