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Full Hop Up Reduces FPS by 100


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#1 kostvoll

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Posted 20 March 2014 - 05:43 PM

Title is pretty self-explanatory. When I chrono my SR10 with zero hop up, it shoots about 425 consistently. With the hop up completely up - I realize it probably wouldn't be completely dialed up in-game - it shoots about 330 consistently. I take it this isn't normal. What could be causing this problem?

I'm using 0.28g BBs, but all FPS values in my post are converted to 0.20g FPS.

Edited by kostvoll, 20 March 2014 - 09:34 PM.


#2 Chuck S

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Posted 21 March 2014 - 02:55 AM

I got a 50fps spread between full and no hopup with 0.28g EliteForce biodegradable BBs a minute ago from my KM4-CQB.  Almost exactly 250 On and 300 Off.  About 290 in my normal setting on this gun.  Again, that's 0.28g BBs, not 0.20.

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#3 Rain Man

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Posted 21 March 2014 - 04:37 AM

Could it be the weight of the bb's somehow? Could you try .20's and see if it happens again?

#4 kostvoll

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Posted 21 March 2014 - 06:24 AM

Thanks for the responses, gentlemen.

Good to know that other people are experiencing significant FPS dropoffs from hopping, Chuck.

Rain Man, I'll give some other BBs a shot and see what happens - although I don't think I have any 0.20s. That being said, I'm concerned there may be a hop up issue. I tested it some more this morning and dialing the hop up all the way up barely has any discernible impact on the flight path of the BB. In fact, I coukd swear it's dropping off sooner.

I will probably open the gun up later today, clean the barrel and hop up, and see what I can see.

Edited by kostvoll, 21 March 2014 - 06:25 AM.


#5 niko_gpsy

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Posted 21 March 2014 - 11:08 AM

Losing up to a 100fps when hop is fully engaged seems a bit high but not unheard of.  I have seen guns lose up to 75 fps with fully engaged hop up so I really wouldn't worry at this point since you will never ever fully engage the hop like that.  Keep an eye on it's performance with normal hop and as long as you do not see a drop in performance I wouldn't worry about it.

#6 kostvoll

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Posted 21 March 2014 - 10:17 PM

Thanks for your reply, niko.

Any thoughts on why a fully engaged hop up would be causing BB flight paths to drop off prematurely and dramatically rather than whip up at the end?

FWIW, I just put a new spring in...

Edited by kostvoll, 21 March 2014 - 10:18 PM.





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