The advance curve can definitely be changed - it is controlled by shims, springs and the height of the cap on the advance. If you look at a TDI pump for instance the cap is much longer, allowing the advance piston to move further.The problem is - change it to what? Without a pump dyno all you can do is guess and test. I don't believe there is really any advance above 4K with the pump in its stock form so in theory allowing it to do more would help it rev in to higher RPM ranges while still being able to burn the fuel in time.At the extreme end, Giles apparently modifies the internal pump body to allow the timing piston to move even further (there is a limit to how much the roller cage can move before the pin bumps against the pump housing). But he's got a pump dyno so he can see exactly what he is changing, plus he knows what the settings are for ultimate power. Part of his "formula" is building a lot more dynamic advance in to the pumps.If you are prepared to be a guinea pig, you definitely can play with the springs / shims / advance cap quite easily. The hard part will be measuring the results in a consistent manner!
Hello fellow deezulers! I just threw this video up on you tube i had collected. It shows the workings of our little injector pumps! I am not sure how to embed videos here so ill just post the link to my you tube page. http://youtu.be/9-GSNR7W73M .
...BTW your Bieber avatar is awesome.-Malone