Originally Posted by Walkthetrigger
I made this for anyone who got their impulse and it is not shooting right and want to know a good setting to just set it to and use it. Also be sure when adjusting the impulse you always do the hpr first to zero not the lpr. Set the hpr to what you want then screw in the lpr to set to your desired setting. These settings work great for me and I will most likely tune them more when I becomes warm out and I have more paint.
Let me know how this setting works for you if you decide to try it, and if you have any suggestions I am always open to try new settings and i will edit this post accordingly.
Chrono used was a yellow handheld RadarChron.
Okay after going through a case of 6 month old white box in the 27 degree weather i think i finally have a good setup for my Impulse.
(all with dwell at 8ms)
Started off on the chrono with LPR out 3 turns velocity out 6 turns. Marker was shooting 340fps and very inconsistent whch would explain why it had so much kick and was so loud. (I just purchased it off a person here on PBnation)
The manual said set the HPR to zero then to 6 turns out then set the lpr to zero and shoot over a chrono until you have a consistent string. Well i could not get under 290 fps that way all the way to 4 turns out and it was +- 35 over the chrono. So i reset the lrp to zero took the hpr to 5 turns out and started shooting finally at 1.5 turns out it was at a consistent 280 with +-6 spike which would be due to weather and using a .693 insert(the only bore the paint would fit consistently in).
I then tried taking the hpr down to 4 turns messing with lpr but then i could not get over 260 until the lpr was further then 4 turns out.
So until it warms up i think i have found a good setting with great accuracy consistency, and the very little kick smart parts advertised.
LPR-1.5 turns out
HPR-5 turns out
chronoed 280 with a plus minus 6 in 27* with 6 month old whitebox
fired one hopper at the consistency above but then ran out of paint.
This will be added to or edited as necessary.
Originally Posted by sethicus41
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...