Oh, just a little bit of insight, when an engine runs higher advance, the cylinder pressure goes up, this is what creates higher Fuel Economy, because there is more energy released during combustion. Unfortunately NOx is the big problem with diesels, it is when O2 and N2 from the air get squeezed together with the heat and pressure of combustion. NOx contributes to photochemical smog and ground level ozone which is really bad for people. Turbos (especially at 25 psi) make this problem worse.
...Unless you have water injection!!... 
:wink:
Thanks guys,
Tony
Instead of starting a new thread, i think i will temporarily hijack this one.
What is the max line where too much advance becomes a problem and starts making more issues then its worth. Like i have my n/a set to 1.00 If i were to bump it up, i would see increased economy and power at the expense of emissions and smoke?
Well, of course the first problem is the creation of NOx(which is helped by water injection). That aside, as far as I know, higher advance makes for more complete burn of the fuel available. If you start burning the fuel earlier, more of it will combust to follow the piston all the way down. The biggest problem from what I have seen and learned on here, is if you advance the timing too far, you will end up with too much resistance against the starter motor, (because the injectors are firing at the pistons while they are on their way up), creating high current draw from the battery, overheating the starter, and not enough cranking RPMs to get the engine fired. A high perf starter, or dual batteries may help this but the better way is to alter the advance in the IP. There are several mentions here about it, and there is a long discussion about it on the other forum, it has a lot to do with internal pump pressure and how the advance mechanism works in the Injection pump. Overall, you want to start with a near stock initial cranking and idle advance, but then you want the overall advance to be higher than stock.
my 2 cents
-T