Ghost Ghost HP .22 Light Hammer Spring - TUNE TRIALS

[IRBent]

The ghost is definitely a different gun than an fx in the way you tune it. I like that it 2 simple adjustments but it doesn’t end up being simple.

Yeah, as in more isn't always more.

 

[AtlasAirguns]

Yeah, there may be a sweet spot in that range that might allow the MRDs to sore, even if it requires a washer or 2 behind that light spring.

I think the Ace Hardware trip may be in order too if you want to get real geeky with the tune. Springs are easy to find there and you may find something in wire gauge or length between the two springs you currently have tested. But yeah it does seem that 115-122 will give you more use of the wheel so that you can use three different pellets.

 

[Solo1]

Springs for the hammer afe really hard to find on the net anyway. I ordered some from china that didn’t pan out well.

 

[Franklink]

To really blow your mind about tuning the Ghost......you can play with the poppet return spring..... As @AtlasAirguns said, REAL deep dive!

The idea of increasing or reducing the preload on that poppet return spring within the valve made me do mental gymnastics to figure out the effects that changes would induce.

For my .20 "tunes" I shimmed the valve return spring.

 

[IRBent]

To really blow your mind about tuning the Ghost......you can play with the poppet return spring..... As @AtlasAirguns said, REAL deep dive!

The idea of increasing or reducing the preload on that poppet return spring within the valve made me do mental gymnastics to figure out the effects that changes would induce.

For my .20 "tunes" I shimmed the valve return spring.

I like learning, wrapping my head around mechanical stuff using logic and reasoning to figure them out or understand how and why. I'm so new at this right now that I don't even know where the poppet is or what it does.

 

[IRBent]

Today I was able to take a little more time testing the 0.047" Light hammer spring in the Ghost HP .22 cal. I decided that I'd do what I intended on doing yesterday, determine what the max power my gun is capable of with the light spring. I started out with the reg @ 101 bar, the PW set to Max and shot 25.4gr MRDs, inching the reg up until I saw the max velocity. I got up to 108 bar and the velocity on a 3-4 shot group averaged 851fps. I nudged the reg up to 110 and the velocity dropped to 840fps with another 3-4 shot group. I turned the reg back down and repeated, once again falling off once I crossed the 108 bar mark. My conclusion is that the light hammer spring cannot push the MRDs much fast than 850fps. I loaded up some 18.13gr JSBs, left the reg at 108 bar and proceeded to see what kind of velocities I'd get at different PW settings. The results below show my test wit hthe MRDs at the top of the chart followed by the 18.13s. The last 3 rows of 18s are 11 shot groups that were shot at targets to see if accuracy was affected by the various PW settings. The Next to last string averaging 937fps had the lowest SD as well as the bets group. Yesterday when testing the 18s at 118 bar and the PW at 10, the gun was sending the 18s downrange at 901 with an SD of 1. I may need to revisit the higher reg setting and see if it produces better groups or sounds wasteful. Right now the lower reg setting sounds nice and the shot cycle is very tame.

Have any of you Ghost HP owners found that 18s tend to group better at higher velocities than the much talked about 880-890fps? My best group came from an average velocity of 964fps using the factory spring .051", reg @ 113 bar per the factory gauge that has since been swapped to a digital gauge.

Ammo Grains	Reg Bar	Power Wheel	Velocity FPS	SD
25.4 MRDs	101	MAX	835
25.4 MRDs	106.6	MAX	847
25.4 MRDs	108	MAX	851
25.4 MRDs	110	MAX	840
18.13	108	7	865
18.13	108	9	901	11
18.13	108	11	922	7
18.13	108	11	932	8
18.13	108	14	967	3
18.13	108	9	907	9
18.13	108	11	937	3
18.13	108	14	965	5

 

[Franklink]

With the .047 wire spring the review Ghost will push the MRDs to 940fps, and this is with a lighter hammer than what you're using. If I add only 38grains of hammer weight (total is still less than what your hammer weighs) I can push em to 960fps.

And with the higher reg pressure you'll find a crisper shot cycle with less of a blaaaaattt impression.

Try 130-140bar reg pressure if you haven't yet and let us know how fast those MRDs go.

 

[IRBent]

With the .047 wire spring the review Ghost will push the MRDs to 940fps, and this is with a lighter hammer than what you're using. If I add only 38grains of hammer weight (total is still less than what your hammer weighs) I can push em to 960fps.

And with the higher reg pressure you'll find a crisper shot cycle with less of a blaaaaattt impression.

Try 130-140bar reg pressure if you haven't yet and let us know how fast those MRDs go.

I'll do it, mañana. I didn't try too hard to go beyond 108 after watching the velocity falter twice.

 

[AtlasAirguns]

Today I was able to take a little more time testing the 0,47" Light hammer spring in the Ghost HP .22 cal. I decided that I'd do what I intended on doing yesterday, determine what the max power my gun is capable of with the light spring. I started out with the reg @ 101 bar, the PW set to Max and shot 25.4gr MRDs, inching the reg up until I saw the max velocity. I got up to 108 bar and the velocity on a 3-4 shot group averaged 851fps. I nudged the reg up to 110 and the velocity dropped to 840fps with another 3-4 shot group. I turned the reg back down and repeated, once again falling off once I crossed the 108 bar mark. My conclusion is that the light hammer spring cannot push the MRDs much fast than 850fps. I loaded up some 18.13gr JSBs, left the reg at 108 bar and proceeded to see what kind of velocities I'd get at different PW settings. The results below show my test wit hthe MRDs at the top of the chart followed by the 18.13s. The last 3 rows of 18s are 11 shot groups that were shot at targets to see if accuracy was affected by the various PW settings. The Next to last string averaging 937fps had the lowest SD as well as the bets group. Yesterday when testing the 18s at 118 bar and the PW at 10, the gun was sending the 18s downrange at 901 with an SD of 1. I may need to revisit the higher reg setting and see if it produces better groups or sounds wasteful. Right now the lower reg setting sounds nice and the shot cycle is very tame.

Have any of you Ghost HP owners found that 18s tend to group better at higher velocities than the much talked about 880-890fps? My best group came from an average velocity of 964fps using the factory spring .051", reg @ 113 bar per the factory gauge that has since been swapped to a digital gauge.

Ammo Grains	Reg Bar	Power Wheel	Velocity FPS	SD
25.4 MRDs	101	MAX	835
25.4 MRDs	106.6	MAX	847
25.4 MRDs	108	MAX	851
25.4 MRDs	110	MAX	840
18.13	108	7	865
18.13	108	9	901	11
18.13	108	11	922	7
18.13	108	11	932	8
18.13	108	14	967	3
18.13	108	9	907	9
18.13	108	11	937	3
18.13	108	14	965	5

If you are trying to tune for two pellets back to back, I still think around that 120bar on the reg may be the sweet spot with that lighter spring. Either way thanks for the breakdown on the charts nice seeing this tune on paper.


Also that 108bar looks like a nice low reg setting. It was grouping okay!

 

[IRBent]

Question for you guys who are more tenured and knowledgeable than I.

Generally what's better if both produce the same velocity, higher reg pressure with a lower power wheel setting, or lower reg with a higher power wheel setting?

My assumption would be higher pressure with a lighter tap on the valve would produce a tight short quick burst of air which would be best. A lower reg pressure would require a longer valve opening to propel the projectile down the barrel, possibly producing excessive air out the muzzle.

 

[AtlasAirguns]

Question for you guys who are more tenured and knowledgeable than I.

Generally what's better if both produce the same velocity, higher reg pressure with a lower power wheel setting, or lower reg with a higher power wheel setting?

My assumption would be higher pressure with a lighter tap on the valve would produce a tight short quick burst of air which would be best. A lower reg pressure would require a longer valve opening to propel the projectile down the barrel, possibly producing excessive air out the muzzle.

I would say the lower reg with the correct spring for a specific pellet tune. But there are guys that use both smaller springs and lower regs as well, obviously, depending on the tune. I always want the reg down for more shot count + less stress on the reg but that is just me.

 

[IRBent]

I would say the lower reg with the correct spring for a specific pellet tune. But there are guys that use both smaller springs and lower regs as well, obviously, depending on the tune. I always want the reg down for more shot count + less stress on the reg but that is just me

No doubt, that light spring that you sent me has indeed allowed auch lower reg for the 18gr JSBs. The shot is very tame too, although I've yet to find a tune that will push the MRDs beyond 840-850fps.

When it's all said, I'll probably run it through the gauntlet from low to high, using both springs and maybe even one from Ace Hardware, as you mentioned. I'll test the weight of both springs to see where they fall before I look into a spring weight in between the two factory springs. I'll keep track of it all in Excel because I'm already forgetting details on what I did a week ago.

 

[Solo1]

Since we’re talking ghost reg and hammer spring here—- i just came in from shooting the 25, yesterday I mentioned that after 16 shots i was dropping poi 1/2”-3/4” @ 50 well today i bumped reg to 135 and dropped wheel to 9 from 16 giving me 4 fps less (924) and it quit doing it. Personally i think they designed everything around a 140 reg and the spring seems to be very critical at any other pressure seems to me they need some custom possibly progressive springs to give us that are used to other guns what we’re looking for.

 

[IRBent]

Since we’re talking ghost reg and hammer spring here—- i just came in from shooting the 25, yesterday I mentioned that after 16 shots i was dropping poi 1/2”-3/4” @ 50 well today i bumped reg to 135 and dropped wheel to 9 from 16 giving me 4 fps less (924) and it quit doing it. Personally i think they designed everything around a 140 reg and the spring seems to be very critical at any other pressure seems to me they need some custom possibly progressive springs to give us that are used to other guns what we’re looking for.

Interesting. For what little testing I've done it does seem I get better results with higher reg pressures, even if that results in higher velocities than is typically considered optimal. No doubt my SDs have gone to pot using lower reg pressures.

 

[Solo1]

Interesting. For what little testing I've done it does seem I get better results with higher reg pressures, even if that results in higher velocities than is typically considered optimal. No doubt my SDs have gone to pot using lower reg pressures.

You just have to try the whole range its kind of a shame to have to dump out so many pellets but? If i were you id decide which pellet is most important set up for that then go from there and see if you can get what you want without adjusting reg

 

[IRBent]

You just have to try the whole range its kind of a shame to have to dump out so many pellets but?

That's exactly what I plan on doing and tracking it all in Excel. I just assumed that when turning the reg up yesterday that I hit a wall when the MRDs started losing velocity once I went above 108bar with the PW on MAX. I never went above 110bar after that, I simply rolled the PW down and started shooting the 18gr JSBs. I did NOT like the speed variances I was seeing, especially that first shot which I guess is related to reg creep. Whatever the cause, it happened even if I let it sit for only a few minutes while I made notes and reloaded the mag.

 

[Solo1]

When your checking velocity check max, 9 and 1 to show what your getting where im starting to get leary of 16 and above

 

[Solo1]

If you can’t get mrds and 18’s to work. I have a lighter spring than brks light spring, at 85 bar it gave me adjustability with my 13 gr just not high enough if you want to try 1 and see? This is what im planning on trying in the fall is use the 47 spring for ft and the 51 for slugs and hunting

 

[IRBent]

If you can’t get mrds and 18’s to work. I have a lighter spring than brks light spring, at 85 bar it gave me adjustability with my 13 gr just not high enough if you want to try 1 and see? This is what im planning on trying in the fall is use the 47 spring for ft and the 51 for slugs and hunting

My understanding is the industry rates spring by lbs per inch. So I'll make a simple tool, much like a t-nut that the spring it sits inside or it slides up into the ID of the spring. Run a cord through it and a washer, capturing the string inside the t-nut and washer. Use a fish scale to to collapse the spring 1 inch and measure the amount of weight required. Test both the .047 and the .051 and see where they fall. All of that if the light spring can't give me at least 900fps on the MRDs.

 

[AtlasAirguns]

My understanding is the industry rates spring by lbs per inch. So I'll make a simple tool, much like a t-nut that the spring it sits inside or it slides up into the ID of the spring. Run a cord through it and a washer, capturing the string inside the t-nut and washer. Use a fish scale to to collapse the spring 1 inch and measure the amount of weight required. Test both the .047 and the .051 and see where they fall. All of that if the light spring can't give me at least 900fps on the MRDs.

Can the MRD be backed down around 880-900 and give you good accuracy? And is there good accuracy mid 900s with the 18.13gr? If so that may be ideal.