I got a 2.8 Duramax but not much diesel talk in the 4 cylinder group so hope here can help.
My stock tune is retarded as much as -6.5 deg in the low to mid rev range and I understand this is for emissions and a quiet smooth engine but how much should I advance it here?
If I do the timing math for 50/50 1800rpm @ 40mm3 I get 7.6 deg BTDC where stock is -6.2 deg ATDC this is a massive difference.
How much would you go here?