There is no such thing as “a tune for a gun” sharing pcp tunes is a marketing ploy.
take the ammo, start at 850 and work your way up til u notice the groups start opening. Or find a speed that really tight.
if that speed is over 890, check accuracy in the wind to make sure u maintain stable flight.
So if this "tuning and repair" thread is bs why are you posting here? I am new to PCP. I'm a former powder burner and shot service rifle competition at my local private gun club. We shared recipes as a starting point to "tune" our guns for that particular powder, bullet and twist rate. I see alot of others talking "tunes" but where to set first and second reg pressures, valve, micro and macro as a starting point would be really nice to know rather than screwing around walking up to what works in my gun. You and others in this thread and others on this forum mention FPS repeatedly but NO ONE mentions the starting point settings to achieve that number.So I shoot over my chrono and see 830 fps. What reg do I crank up first? Or maybe I should crank on the hammer tension? No wait! How about if I screw the valve in and out a few times? Think that would work???????
First of all, these guns are not powder burners. Yes they shoot a projectile but other than that, they are a completely different animal. On Cornys behalf, some of us overlook the fact that there are probably a ton of new Impact owners that were bamboozled by videos and hype but truly have no clue what they’re doing. It’s very simple. Don’t worry about your first reg, it’s almost completely irrelevant unless you start using a high second reg setting. Set your second reg on 90b, open the valve past 4 lines, set your hammer wheel on 16 and turn your micro down to 2. Shoot, click your micro +4 clicks, shoot, click your micro +4 clicks. Keep doing it until your gun doesn’t get any faster. That’s your max speed for that reg setting. Here is the first important part. If you want shoot your projectile 900fps, you want your max speed for whatever reg setting to be 3-5% higher than the speed you plan to shoot. So let’s say 90b only gave you 880fps max, all you do is turn up the second reg 5b. Shoot then keep clicking your micro up +4 clicks until you reach your new max speed. At 95b let’s say your max is 925fps. Turn the reg up some more and repeat the process. So now at 100b your at 940fps, now it’s finally time to touch your hammer wheel. Use the wheel to shave 30fps off your max. That puts you at 910fps with the wheel on let’s say #13. Now it’s time to start turning the valve in while shooting over the chronograph until you see the last drop in speed that puts you right at 900fps. All done. Sounds like a lot but it’s not. It took me longer to type this than it does to actually do it. The reason why you don’t need starting points is because it only takes a couple minutes to establish your own starting points for your gun. When you learn the process, you learn your gun. One tiny thing different about my gun makes it behave way different than your gun. Yes, they’re that sensitive. I hope spikex41 reads this before he sets fire to his Impact.