George, you have it exactly right, all the lever will do is bump the timing initially, then once rpms and pump pressure increase the timing advances normally. Yes there is the limit of travel in the pump, however the pump may not necesarily reach its full advancement in stock form, especially with today's thinner ULSD, and pump wear. That can be accomidated by adjusting the preload pressure on the spring on the pump relief valve (the small tube from the alt solenoid runs up to it). With the pump pressure raised your getting the benefit of the most possible pump timing that the pump can deliver, along with a small increase in injection amount thanks to the higher internal pump pressure.
When I get my car dyno'd comming up here soon I will be doing a back to back run with it connected and disconnected. The butt dyno confirms that it pulls stronger around 2500rpms and up compaired to before though..
Jason
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