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Old 09-08-2019, 05:39 PM   #1
Young Gun
 
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WASP kit FPS loss

Hi all, i have the covert 16" SRS gen 3 with an M150 Silverback spring and on .45s im getting 324 fps which is great for UK limits at that weight and joules (approx 2.3j)
When i install the WASP piston with steel sleeve and standard airbrake i drop fps down to 240fps and 1.6 joules.
Anyone else had this?
Cheers
Mark
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Old 09-08-2019, 08:58 PM   #2
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You are adding weight (slows piston down) AND cutting off the power a bit with the air break. That’s whats going to happen. If you got the wasp for creep you need to bump the power back up with a bigger spring and possibly some other variables.
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Old 09-09-2019, 01:03 AM   #3
Fluppi   Fluppi is online now
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You need to use a thin silicon oil on the outside of the piston cup, and no lube or grease inside the cylinder. Also check so you have 100% airseal.
I'm getting 2.3J with WASP, full weight and full brake with a m140 and 3 spacers. Also make sure to chrono with hop on.
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Old 09-09-2019, 03:15 AM   #4
Young Gun
 
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Thanks guys for your replies, so i checked for full airseal and it is leaking slightly as the piston moves very slowly when i cover the end of the barrel which i think points towards a leak at the hop unit. (Standard hop unit) so ill have to check that later, that said i dont see an fps drop when using the old silverback piston? Which confuses me.
Im sure snipermechanics video he used an M150 spring and steel piston with the standard airbrake and got 2.3j which is the set up i tried.
I could get a heavier spring, i just wasnt sure if id be covering up any issues when he got a different output on the same set up.
Do you use abbey silcon oil on the cup or the grease thats supplied by silverback when you get the gun?
Hop is on hence the good reading on .45s with the old silverback piston.
Ill try the non airbrake option on the wasp kit tonight and see what readings i get.
Thanks for your replies, i appreciate the help.
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Old 09-09-2019, 05:05 AM   #5
Fluppi   Fluppi is online now
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Quote:
Originally Posted by Bakerxxx View Post
Thanks guys for your replies, so i checked for full airseal and it is leaking slightly as the piston moves very slowly when i cover the end of the barrel which i think points towards a leak at the hop unit. (Standard hop unit) so ill have to check that later, that said i dont see an fps drop when using the old silverback piston? Which confuses me.
Im sure snipermechanics video he used an M150 spring and steel piston with the standard airbrake and got 2.3j which is the set up i tried.
I could get a heavier spring, i just wasnt sure if id be covering up any issues when he got a different output on the same set up.
Do you use abbey silcon oil on the cup or the grease thats supplied by silverback when you get the gun?
Hop is on hence the good reading on .45s with the old silverback piston.
Ill try the non airbrake option on the wasp kit tonight and see what readings i get.
Thanks for your replies, i appreciate the help.
I use a thin silicon oil from taiwangun, but I've heard Abbey silicon oil work too. Definitely try it if you haven't. Just a drop or two is enough.(Dont forget to wipe away any other grease in the cylinder and on the piston.)
Other than that, you can try changing the piston weight and airbrakes. Every replica is different.
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Old 09-09-2019, 05:40 AM   #6
Young Gun
 
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Cheers Fluppi, im going to have a play tonight with the different combos. I realised i havent tried any of the spaces yet that go on the spring guide. Think we get 3 in the kit, ill try adding those too and see what fps i get.
If i upgrade the spring do i go M160 or M170, not sure what the fps jump is per spring.
Im currently at 240 fps on .45s so would like to get back to 325 fps on .45s or there abouts if i can.
Cheers mate.
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Old 09-09-2019, 09:02 AM   #7
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I'd look at the RAPAX springs. Get the 3J spring and then adjust piston weight and airbrakes until you end up where you want it.
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Old 09-09-2019, 09:23 AM   #8
Fluppi   Fluppi is online now
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+1 on Rapax springs.
My 2+ Joule Rapax spring is giving me 2.46j on average with 16" barrel, wasp full brake full weight and the 3 spacers included with the wasp. You could also buy a Rapax 3j+ or m160 spring and cut a few coils.
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Old 09-09-2019, 09:54 AM   #9
Young Gun
 
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Cheers you two for the help. Just orderd the 2+joule rapax spring, the +3j was out of stock. I couldnt see them anywhere else in the uk.
Do you know who else stocks them?

Ill see how that goes anyway, im playing Saturday so want something working by then. If i still have no joy with the +2j ill wait for the +3j rapax or buy the M160 and cut a few coils if needed like you suggested.

Thanks for the advice 🙂

Are the Rapax springs easier to pull than the silverback ones? Just curious as i think i read that somewhere.
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Old 09-09-2019, 10:16 AM   #10
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Skirmshop has them usually.

I have the SBA M170 in my VSR. I get 3.3-3.5J on it with my .43g bbs. I also have a RAPAX Hulk spring but I haven't done any testing with it yet.
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Old 09-09-2019, 10:27 AM   #11
Young Gun
 
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Apologies i meant to say i had orderd the rapax 2+j spring from skirmshop. Any other retailers as the +3j was out of stock on there.
Sorry my mistake not qouting skirmshop in my last post.
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Old 09-09-2019, 11:17 AM   #12
Fluppi   Fluppi is online now
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You can contact Milan Rapax himself on facebook. Join a SRS group to find him easier.

I'd say the pull is pretty similar to the SBA springs (2+ = m140, 3+ = m160, Hulk (4+) = m170) but gives slightly higher joules.
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Old 09-28-2019, 03:59 PM   #13
Milan   Milan is offline
Young Gun
 
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Sorry to you all, maybe I'm a bit late with reply...
I'm producer of rapax springs. Compared to SBA, my springs are more conssistant, more durable, easier to pull with same power, and more expensive than sba springs bcs my batches are 100-200 pieces and they are handmade on a machine, not automated process.
Rapax 2+ should give 2.3J with 0.45 and 16" barrel srs wasp airbraked, no fps rings needed. If you have less, please check your setup, use just a drop of thin silicon oil on a cup. To much oil can drop your fps/J. Always measure J with hop adjusted and with bb you use.
Rapax 3+ is ~3.3J in 16"
Rapax Hulk is ~3.9J in 16"
For example, my srs setup is optimised to the maximum, I use 20" and get 2.6J-3.6J-4.5J (2+,3+,Hulk), no spacers.
I don't visit forums every day, but I try to catch up. If you need some urgent help, you can find me on facebook 🙂
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Old 09-29-2019, 08:21 AM   #14
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I'm running aluminum sleeve with custom airbrake (2/3 length of standard and tapered) on my VSR. 430mm barrel. Hulk Spring. Getting 3.7J with .48g.

If I remove the brake the J goes well over 4.

Used it yesterday and got some nice kills over 200ft. People in between me and the target reported not being able to hear the rifle but heard the bb whiz by their heads. Quite a few "holy shit's" were said.

Consistency seems to be on par with SBA springs (~3fps variance at the worst). I can report that the Hulk is as easy to pull as the SBA M170 and gives more power. Haven't used either spring long enough to comment on longevity.
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Old 09-29-2019, 01:08 PM   #15
Young Gun
 
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Hi Milan,
I appreciate the reply, im not on facebook as appreciate you replying to this thread.
With the WASP piston and standard airbrake on .45g bbs im getting only 1.7 joules and around 250 fps where as if i drop the original silverback piston in i get 324fps and 2.3 joules on .45gs.
Im waiting for a new hop rubber to come this week, when it does ill retest the gun.
I had a slight airleak before and fixed that but annoyingly the hop rubber got torn when i removed the hop unit as it was so bloody tight so havent had chance to test again.
Ill let u know how i get on mate as i can gurantee when i retest with the WASP piston it will still be sitting around 250fps. 😞
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