(Originally posted sethicus41 on PbNation)

After email correspondances with Sean, and my conversation with Hans(head of engineer department of smart parts)

this is the best way to tune your impulse 09!!!

1. Set your stock dwell to default 8

2. Turn up the LPR ALOT-pretty much all the way out...
why? max cap pressure is around 60-65psi (this is a prevention of people messing with lpr) and you only need roughly 50psi to get optimal) (note screwing grub all the way in makes it 35psi)

3. Gas up and Chrono with HPR to 320fps

4. Turn down LPR until it shoots about 305-310 fps

5. Then use the HPR to turn it down to regulation speed.

This is the best for your particular gun... DO NOT COMPARE your number of turns out with other people's turns out... you will not tune your marker if you do... every impulse functions the same way, however no two markers are alike... you want quiet, you want consistency, you want optimal settings... this is the best "recommended" way...