EVOL Evol HPS (original) 18.13 Tune

[CTAirgunner]

18.13 JSB tune.

The monster redesigns have too many inconsistencies so I broke the HPS down today and had a blast learning the rifle and tuning it.

There is NO EASIER rifle to work on, I thought I could not be in any more awe of @americanairarmsofficial products but here I am, more awed than yesterday.

Anyways , very pleased with the 18 grainers and still doing some fine tuning on scope placement / stock adjustments.

I'd say there's 22 dead animals at 75 yards all day

Anyways , there is a picture of the reg setting and also the HST screw is about 1/8 protruding from the action.

Yours may differ a little because my hps has a longer barrel at 21 inches than the rest of the current evols.


I would have kept shooting but downpours were coming

 

[Bladebum]

In that gun on that tune you are going to get approximately 7,578 shots,Very nice! my standard also shoots 18.13s absolutely lights out, the MRDs never impressed me out my gun. It really is incredible how efficient AAA guns really are

 

[CTAirgunner]

In that gun on that tune you are going to get approximately 7,578 shots,Very nice! my standard also shoots 18.13s absolutely lights out, the MRDs never impressed me out my gun. It really is incredible how efficient AAA guns really are

So , I was surprised, I got 5 Mags out of this tune, I think I could have gotten 60 shots but just topped off at the 5th mag as it looked close, that is 20 to 25 more shots than it was getting with the 25.39s but the spread on the tune is so tight I'm inclined to leave it rather than play with it.

 

[Bladebum]

So , I was surprised, I got 5 Mags out of this tune, I think I could have gotten 60 shots but just topped off at the 5th mag as it looked close, that is 20 to 25 more shots than it was getting with the 25.39s but the spread on the tune is so tight I'm inclined to leave it rather than play with it.

Hmmm that's very interesting. To me that sounds like a case of too much hammer for reg pressure. Maybe 1600-2000 psi range might be better?

 

[CTAirgunner]

Hmmm that's very interesting. To me that sounds like a case of too much hammer for reg pressure. Maybe 1600-2000 psi range might be better?

At 1500 psi on the reg it shot them at 960 fps with the HST spring out 3/8 of an inch maybe more. 960 was the lowest I could get them to fly at 1500.

Consistency is what I'm after , at that psi I'd have to really back the hammer out and that would lead to large spreads.

 

[Madeintheuk]

Hmmm that's very interesting. To me that sounds like a case of too much hammer for reg pressure. Maybe 1600-2000 psi range might be better?

I had the same thought when I talked to him about it yesterday, but you can’t argue with those spreads. Im unsure if too much hammer would give you that right of a spread if you were wasting that much air. I would think inconsistency would be much worse if that was the case.

 

[Dairyboy]

So , I was surprised, I got 5 Mags out of this tune, I think I could have gotten 60 shots but just topped off at the 5th mag as it looked close, that is 20 to 25 more shots than it was getting with the 25.39s but the spread on the tune is so tight I'm inclined to leave it rather than play with it.

You should be getting much more than that honestly. When I tuned my Standard to 865fps with the 18gr I got 110 shots per fill. Reg around 1600psi.

 

[Bladebum]

At 1500 psi on the reg it shot them at 960 fps with the HST spring out 3/8 of an inch maybe more. 960 was the lowest I could get them to fly at 1500.

Consistency is what I'm after , at that psi I'd have to really back the hammer out and that would lead to large spreads.View attachment 674

Sounds like Tom's new hammer spring design with a lighter spring will be right up your alley!

 

[CTAirgunner]

You should be getting much more than that honestly. When I tuned my Standard to 865fps with the 18gr I got 110 shots per fill. Reg around 1600psi.

What was spread though ?

Also this barrel is 3 inches longer than the 18" variant and 6 inches longer than the 15" , finding the slower speeds like that may not be achievable but I am going to find out today , first im going to back the hst all the way out and see what happens at the setting I'm at now.

I am not saying you guys are wrong, I'm just concerned with consistency first and foremost.

 

[Dairyboy]

I think over those 110 shots around 15-20fps. I would assume you should be able to make it get much lower. You'd have to remove the stock to back it out more. Removing the chassis you can only go so far until it doesn't fit. Doesn't hurt just to try it out. But just what it sounds like to me air is being wasted. Consistency is impressive though.

 

[CTAirgunner]

I think over those 110 shots around 15-20fps. I would assume you should be able to make it get much lower. You'd have to remove the stock to back it out more. Removing the chassis you can only go so far until it doesn't fit. Doesn't hurt just to try it out. But just what it sounds like to me air is being wasted. Consistency is impressive though.

Maybe I need to lower the reg more lmao , I'm gunna fiddle today. They're so easy ro work on it is pleasurable

 

[CTAirgunner]

@Bladebum @Dairyboy @Madeintheuk you guys were all spot on

like i mentioned to , my consistency was there and the small increments i was making were bringing upon sporadic readings even after 3 or 4 shots to settle, so I said heck with it. I will never argue with consistency.

I decided to back the HST off till it would not fit in the stock and made small incremental adjustments until I hit 890ish

I haven't not tested groupings yet but am about to shortly but this is my current spread

2100 psi to 1150 psi yielded 60 shots.

Thanks for making your points or I would have not had done this.

I now have a very smooth easy cocking , at least 50% quieter rifle, and more shot count. Now to test it on paper.

 

[Bladebum]

@Bladebum @Dairyboy @Madeintheuk you guys were all spot on

like i mentioned to , my consistency was there and the small increments i was making were bringing upon sporadic readings even after 3 or 4 shots to settle, so I said heck with it. I will never argue with consistency.

I decided to back the HST off till it would not fit in the stock and made small incremental adjustments until I hit 890ish

I haven't not tested groupings yet but am about to shortly but this is my current spread

2100 psi to 1150 psi yielded 60 shots.

Thanks for making your points or I would have not had done this.

I now have a very smooth easy cocking , at least 50% quieter rifle, and more shot count. Now to test it on paper.

View attachment 688

Those numbers look great! Except are you still only getting 50ish shots? With that gun on that tune, I would fully expect 120+ shots. I would bet good money the accuracy will be excellent, just hoping your shot count went through the roof. My brother has a standard EVOL like mine, except his is on what I call "eco tune" . His reg is at 2k and he shoots 21 grain h&n slugs at 940 fps for something like 7-8 mags!

Here's something as well, I used to shoot 21 grain h&n slugs out of my standard. The reg was 2100-2150 and I was shooting them at 930 fps and got about 50 shots. Now I have the reg at 2300 shooting 23 grains at 930 for nearly the same shot count. There is definitely a sweet spot. With all that extra barrel and airtube on that hps, I would think it is capable of rediculous shot count at those powers!

 

[Dairyboy]

@Bladebum @Dairyboy @Madeintheuk you guys were all spot on

like i mentioned to , my consistency was there and the small increments i was making were bringing upon sporadic readings even after 3 or 4 shots to settle, so I said heck with it. I will never argue with consistency.

I decided to back the HST off till it would not fit in the stock and made small incremental adjustments until I hit 890ish

I haven't not tested groupings yet but am about to shortly but this is my current spread

2100 psi to 1150 psi yielded 60 shots.

Thanks for making your points or I would have not had done this.

I now have a very smooth easy cocking , at least 50% quieter rifle, and more shot count. Now to test it on paper.

View attachment 688

Wow 50 shots with 7fps spread? That thing is hummin!

 

[Madeintheuk]

It’s actually a good point. Sometimes lower reg pressures don’t sway mean higher shot count. You want a snappier shot cycle where the valve closer fast to conserve air, yet have enough umph to shoot the pellet to your desired speed. This is why most guys shooting slugs have their reg pressures so high. It helps close the valve faster, and less wasted air. If you like playing with tuning, why not try a 1500psi tune, and a 1900psi tune, and see if you can still get the velocity low enough. You might be surprised with shot count numbers.

For perspective, I have my dremtac compact with 300mm barrel shooting 750fps with 14.3g pellets. I have the reg set at 145bar, and backed the hammer way off. Out of a 300cc bottle, I’m getting 150 shots from 250bar down to 150bar. It’s quiet enough not to need a moderator, but with one, it’s mousefart. The spreads aren’t as great as yours, but the accuracy is there for sure. Sometimes we get caught up in spreads, and forget that it’s nothing without accuracy.

Have fun tuning. I think I’ll be diving into mine soon.

 

[CTAirgunner]

@Madeintheuk we were chatting and you had missed the thing about 2100 psi to 1150 psi yielded 60 shots.

So new update on the setup. It is really awesome. Again I thank the aforementioned bunch who gave me input as you lead to this fine tune.

I only filled to 3400 psi and took her out, from 3400 to reg I got exactly 9 magazines, so 99 shots, if I were to fill to 4000 this rifle , by the math, could get 136 shots. Which is huge considering yesterday I was at 55-60.

It's also mouse fart quiet now, literally. It feels like it's broken lol. It also has a much calmer cycle and easier to cock.

It's accuracy is superb as well...

So thanks to you guys for questioning things.

 

[Bladebum]

@Madeintheuk we were chatting and you had missed the thing about 2100 psi to 1150 psi yielded 60 shots.

So new update on the setup. It is really awesome. Again I think the aforementioned bunch who gave me input as you lead to this fine tune.

I only filled to 3400 psi and took her out, from 3400 to reg I got exactly 9 magazines, so 99 shots, if I were to fill to 4000 this rifle , by the math, could get 136 shots. Which is huge considering yesterday I was at 55-60.

It's also mouse fart quiet now, literally. It feels like it's broken lol. It also has a much calmer cycle and easier to cock.

It's accuracy is superb as well...

So thanks to you guys for questioning things.
View attachment 689View attachment 690View attachment 691View attachment 692View attachment 695

Now thats more like it!!

 

[Dairyboy]

Don't touch nothin! Lol man that's awesome accuracy! I can imagine it's gotta be a sweet docile shot cycle now!

 

[CTAirgunner]

Don't touch nothin! Lol man that's awesome accuracy! I can imagine it's gotta be a sweet docile shot cycle now!

It really is, I feel like I'm shooting my prod lol but , much nicer..

With that said, I need to get some scope issues sorted out. This one sits too high because of the objective lens and overall gargantuan size of the entire thing. I would prefer a scope that sits much lower to the barrel like on my mini.

 

[Dairyboy]

Lol what is it? I Titan? I have a 4-20x50 Athlon Helos that fits nicely. Just enough room for the mag. Ideally I want the 2-12x42 on the mini but dont want to mess with my gun with how well its shooting right now