Board Thread:General Nerf discussion/@comment-45444397-20200420165619/@comment-27306930-20200420204540

Mman is right on target. Three IMRs will give you 11.1 volts, which is perfectly safe and will increase the rate of fire. However, typical 1000mAh IMRs barely produce enough current to power the motor through the priming cycle.

To fix that, I run two sets of 3 IMRs in parallel. This configuration provides more than enough current to keep up a sustained firing rate around 3 darts per second.

The beauty of this setup is you can switch to 4 IMRs and run it at 14.8 volts. I wouldn't recommend running on 4 IMRs permanently, or for really long bursts, but it's fun for occasional plinking.

Unfortunately, upgrading the batteries does nothing for the poor range. You will need to upgrade the spring or remove the AR (or both) to get better ranges. BlasterParts makes a 6kg spring that works really well. I wouldn't go much above 6kg because the plunger tubes on these old Vulcans are getting brittle, and you don't want to bust the bottom out.

If you do upgrade the spring, you MUST run two IMR packs in parallel due to the extra current the motor will draw. Or switch to a small 2S LiPo pack.