Pulled from the Ultimate Ion Guide.
Originally Posted by Kolder
Q: How do I fine tune my Ion for best performance?
A: Following these steps, you can setup your Ion for best gas efficiency and velocity consistency. Your reg must be properly broken in and lubed for good results. I get +/-2 fps at the chrono.
1. Bottom out the dwell
2. Set your input pressure to about 120 psi
3. Increase the dwell until the marker cycles properly at +/- 10 fps consistency
4. Increase your input pressure up to desired fps
5. Increase the dwell up by 1 until velocity stays consistent. If consistency is already good. reduce the dwell down by 1 until it becomes inconsistent, then bring back up 2.
Also, you can use ZDSPB's website..