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Old 03-30-2020, 01:22 AM   #1
Vsr10   Vsr10 is offline
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Vsr 10 action army piston or...

I install pps cilynder kit and rapax 3+ spring and acording to diy chrono (audacity) got 500fps with 0.2 (zero hop up) and 392fps with 0.43 (with hop up), no air leaks, so i was planning to upgrade piston with this Action army one (blue i currently have), can AA piston give me more fps with this same spring? AA piston is my only replacement choice for now, 500fps slow for me, because my stock cyma 701 had 510fps
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Old 03-30-2020, 02:50 AM   #2
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If your airseal is fine, you won‘t get more fps. Also the weight of the piston is probably about the same.
Pps parts are trash though...

Last edited by Fynn64; 03-30-2020 at 02:53 AM.
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Old 03-30-2020, 03:33 AM   #3
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Quote:
Originally Posted by Fynn64 View Post
If your airseal is fine, you won‘t get more fps. Also the weight of the piston is probably about the same.
Pps parts are trash though...
I know they are trash but this is only choice, piston is about 45g (pps) stock plastic is 28 i think, do you recommend to add weight on pps or to get it light as possible for more joules?
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Old 03-30-2020, 03:55 AM   #4
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I meant that the pps piston weighs about as much as the action army piston.
Weighting the piston can increase or decrease your fps, dependent on your setup and bb weight.
I’d say, just keep your setup as it is, 10fps don’t make a huge difference.
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Old 03-30-2020, 06:12 AM   #5
Vsr10   Vsr10 is offline
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Quote:
Originally Posted by Fynn64 View Post
I meant that the pps piston weighs about as much as the action army piston.
I realized later, i got with 0.36 and 0.43 same result 392fps, my plan is to get it to about 650fps,do i need to put stronger spring or better piston for that? And with what M spring is equal to rapax 3+? M180? Here is how much piston exit from cylinder with rapax 3+
My guess is to put sp190 spring and put some weight on piston for the more joules, this will be probably better than rapax 3+ and swiss cheese the pps piston right?
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Old 03-30-2020, 07:09 AM   #6
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There's a RAPAX Hulk spring, but I don't know if it will get you to 650fps with .2g.

It all will depend on your piston weight and barrel length.

Keep in mind that you don't need to get to 650fps with .2g to get to an equivalent joule output with .43g+. IF you weight the piston you will not get to 650fps with .2g, but since you're not using .2g it doesn't matter right? Weighting the piston should improve your power output with the heavier bbs.

I'm getting 4J with the Hulk spring and .48g bbs, 430mm 6.01mm barrel, WASP piston with max weight sleeve. For reference.
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Old 03-30-2020, 08:47 AM   #7
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The heavier your piston the more joules. Also, the difference between 500 and 510 is negligible. Finally, always make sure you comply with the law within your country. There is an entire Wikipedia page concerning this that lists airsoft laws in most countries. I'm not 100% sure which countries 650 fps is legal in. Also, pps/shs parts are reasonably good. If you look on the website in emphasizes that they get a bad rap due to fake parts which take their brand name. Their gears and motors are half decent for example. 1 way of increasing piston weight is to wrap lead solder around it and tape it down.
https://en.wikipedia.org/wiki/Legal_issues_in_airsoft
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Old 03-30-2020, 08:52 AM   #8
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Quote:
Originally Posted by AccurateDMD View Post
There's a RAPAX Hulk spring, but I don't know if it will get you to 650fps with .2g.

It all will depend on your piston weight and barrel length.

Keep in mind that you don't need to get to 650fps with .2g to get to an equivalent joule output with .43g+. IF you weight the piston you will not get to 650fps with .2g, but since you're not using .2g it doesn't matter right? Weighting the piston should improve your power output with the heavier bbs.

I'm getting 4J with the Hulk spring and .48g bbs, 430mm 6.01mm barrel, WASP piston with max weight sleeve. For reference.
thank you for responding, power output with 0.43 is exactly what i want, you using hulk or rapax? Whats is yours fps with 0.48g bbs to get 4j?440?
What is the weight of your piston with max weight sleeve?
I am using 6.03 430mm steel barrel and pps cylinder kit, don't know volume
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Old 03-30-2020, 08:57 AM   #9
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I would like to have like you 4j or slightly more, with 0.43,maybe is this piston to light..
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Old 03-30-2020, 09:13 AM   #10
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The Hulk spring is made by RAPAX.

~420fps with .48g.

I can't remember max piston weight. I think it was 100 or 120g.
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Old 03-30-2020, 09:20 AM   #11
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Quote:
Originally Posted by BlackDogAirsoft View Post
The heavier your piston the more joules. Also, the difference between 500 and 510 is negligible. Finally, always make sure you comply with the law within your country. There is an entire Wikipedia page concerning this that lists airsoft laws in most countries. I'm not 100% sure which countries 650 fps is legal in. Also, pps/shs parts are reasonably good. If you look on the website in emphasizes that they get a bad rap due to fake parts which take their brand name. Their gears and motors are half decent for example. 1 way of increasing piston weight is to wrap lead solder around it and tape it down.
https://en.wikipedia.org/wiki/Legal_issues_in_airsoft
"According to the Law on Weapons and Ammunition, airsoft guns fall into category D in classification of weapons, which means anyone over 16 may legally acquire an airsoft gun. No licensing is required. There are no special regulations regarding shape, function or other characteristics of an airsoft gun"
i think that we don't have fps limit here xD but whatever, i don't won't to hurt someone, just to make posible 90-100m shoots, and that the target can fell enough bb to at least 80m when i hit him
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Old 03-30-2020, 09:28 AM   #12
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Shs gears and motors are good. Their vsr parts are not.
Also, weighting the piston doesn´t have to give you higher fps. This completely depends on your setup.

If your power output with 0.43 is exactly where you want it to be, why change the spring?
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Old 03-30-2020, 09:37 AM   #13
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Quote:
Originally Posted by AccurateDMD View Post
The Hulk spring is made by RAPAX.

~420fps with .48g.

I can't remember max piston weight. I think it was 100 or 120g.
Thank you, my piston is aprox 45g,il will make it to about 70g and test it
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Old 03-30-2020, 09:40 AM   #14
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Quote:
Originally Posted by Fynn64 View Post
Shs gears and motors are good. Their vsr parts are not.
Also, weighting the piston doesn´t have to give you higher fps. This completely depends on your setup.

If your power output with 0.43 is exactly where you want it to be, why change the spring?
Its about 390fps and 3j with 0.43,i need it to be about 4j
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Old 03-30-2020, 10:23 AM   #15
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Changing solely the piston won’t give you much of a gain, Id change other variables mentioned above. If you are stuck on ONLY changing your piston for a gain, a shorter piston would help. EdGi makes a shorter one (compared to most) but I’m not sure about other brands.
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