callumbagshaw Posted April 11, 2016 Share Posted April 11, 2016 Hi guys, Bought myself a Krytac CRB last week and it's GREAT! The only thing is (and I'm not sure I'm complaining because I kinda like it); I took out the fuse, and wired it to deans - since then, semi-auto has decided to become 2 shot burst. Does anyone know why that might happen? Cheers. Link to comment Share on other sites More sharing options...
Supporters Samurai Posted April 11, 2016 Supporters Share Posted April 11, 2016 Did you happen to switch to lipo at the same time? Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 Always used lipo's in it... Just moved from 7.4v tamiya (with fuse) to 11.1v deans (fuse removed) Link to comment Share on other sites More sharing options...
Supporters Samurai Posted April 11, 2016 Supporters Share Posted April 11, 2016 Oh, then it's the 11.1V. I read it here somewhere here where just switching from nimh to lipo caused this for a guy. Link to comment Share on other sites More sharing options...
Giliador Posted April 11, 2016 Share Posted April 11, 2016 CRB in UK have lower rate main spring so manufacturer recommend 7.4v lipo or 9.6v NiMH otherwise it will overspin on Semi and double shoot. Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 CRB in UK have lower rate main spring so manufacturer recommend 7.4v lipo or 9.6v NiMH otherwise it will double shoot and even have problem with feeding. Shit... Well the 11.1v lipo offers a FAR superior fire rate... What steps could I take to ensure I get maximum performance out of the 11.1v? Link to comment Share on other sites More sharing options...
Giliador Posted April 11, 2016 Share Posted April 11, 2016 In uk there is not much you can do, you can get the US high torque motor but on lower tension spring it will still overspin, and if you change spring it stop double shoot but your fps will increase, is there noticeable difference between 7.4 and 11.1v? you might notice feeding issue as well on 11.1v Link to comment Share on other sites More sharing options...
Baz JJ Posted April 11, 2016 Share Posted April 11, 2016 yeah I use 7.4V on mine (20k motor and standard UK spring) and its fine on semi. Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 In uk there is not much you can do, you can get the US high torque motor but on lower tension spring it will still overspin, and if you change spring it stop double shoot but your fps will increase, is there noticeable difference between 7.4 and 11.1v? you might notice feeding issue as well on 11.1v The fire rate difference is more than noticeable, it's evident! Further to that, my FPS on .25's was 280, 320 with .2's - my site limit is 365 so there's room there. That said, it shoots fantastic even at 280! Link to comment Share on other sites More sharing options...
Baz JJ Posted April 11, 2016 Share Posted April 11, 2016 Ive bought PTS EPM mags for mine and plan to try with .25s and .28s. Not too bothered about ROF as I rarely use full auto unless it's in very short bursts of 3 or 4 rounds. Link to comment Share on other sites More sharing options...
Giliador Posted April 11, 2016 Share Posted April 11, 2016 In theory changing spring should stop overspin but might make the gun hot on 20, but don't quote me on it. Try Krytec forum I'm sure Kriss Sierra Tango or Allizad will be able to help Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 Disregarding rate of fire - even for semi auto (despite it shooting twice with the overspin) the trigger response with the 11.1v lipo is evidently better too... Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 In theory changing spring should stop overspin but might make the gun hot on 20, but don't quote me on it. Try Krytec forum I'm sure Kriss Sierra Tango or Allizad will be able to help Thanks mate I'll have a word. Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted April 11, 2016 Supporters Share Posted April 11, 2016 The UK ones with the 20k motor are usually ok using m100 or m110 springs with a 11.1v lipo. I am guessing if yours is 20k then your spring is lower than an m100. If yours has the US 30k motor inside and you use an 11.1v lipo with a lower rated spring you will get overspin and double firing issues. Check which motor you have and then use the battery and spring combo which works best or change the mosfet for one ab type. Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted April 11, 2016 Supporters Share Posted April 11, 2016 CRB in UK have lower rate main spring so manufacturer recommend 7.4v lipo or 9.6v NiMH otherwise it will overspin on Semi and double shoot.Wrong.If you have a US version with a 30k motor and a spring below 120 you can get overspin when using 11.1v. The Uk ones with the 20k motor can run an 11.1v with springs as low as m100 and it shouldn't be an issue. Thats why the UK has a slower motor to compensate for the lower rate springs when using 11.1v. Link to comment Share on other sites More sharing options...
Giliador Posted April 11, 2016 Share Posted April 11, 2016 Wrong. If you have a US version with a 30k motor and a spring below 120 you can get overspin when using 11.1v. The Uk ones with the 20k motor can run an 11.1v with springs as low as m100 and it shouldn't be an issue. Thats why the UK has a slower motor to compensate for the lower rate springs when using 11.1v. This is quote from Krytac Depend on your region. US , CA, South America and most of EU have no issue with 11.1v lipo as long as you keep the discharge rate within 15-20c. For UK, Italy and Japan, a 7.4v would be recommended due to a weaker spring. A 11.1v will tend to overspin on Semi. 20k is to balance performance, not to make gun compatible with 11.1v Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted April 11, 2016 Supporters Share Posted April 11, 2016 But not with the 20k motor they use for the EU now. I have wired up a couple with deans and an 11.1v and they have been fine. If the 11.1v has a high discharge rate that could be an issue. The 20k is to allow the gun to be used with an 11.1v which is what Krytac was led to believe is the most common used battery by the UK distributor. That came from a Krytac rep that I was talking to. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted April 11, 2016 Supporters Share Posted April 11, 2016 your options are: Lower Juice - obviously Stronger Spring - but risk of too hot for UK sites AB Mosfet - hmmm as it is built into box not that easy Shortstroking - this is the reason for shortstroking preventing overun/double cycle & possible Pre Engagement at higher speeds You in effect plop in say a M110 or M115 placing you over at 360-375ish But then remove 2 rear teeth off sector+piston to come down 15fps per tooth = back to 350fps Piston has 3 or 4 metal teeth on it However the SS method will void any warranty so I would suggest lowering the juice on a M105 spring or some spring that gets you 349.999fps You could use a different motor that may perform slightly faster/slower but tbh it isn't the motor but higher juice & m100 spring setup I would like to point out that if a gun is starting to over-run - heck double cycle in you case.... If a gun is firing twice on semi - then that is an early warning sign of possible PE if pushed any more So do not think the 2 rnd burst is great coz going a bit quicker like on a freshly charged 11.1v @ 12.6v or a higher C or burst rating Will risk possible PE - you may be another 5rps off PE or just a few off PE - so be warned it is not a great thing to be left ignored The gun is in effect talking to you - so I suggest you listen to it and perhaps ease up on double firing Yes Krytac could of SS their US guns a tooth or two - still plenty for a barrel up to say 400mm I'm guessing you are well into the 20's possible approaching 25rps try 9.6v - but forget LiFe batteries - they do not offer the grunt as you would expect imho Trigger is correct - the 20k motor shouldn't over-run on 11.1v unless you got a mofo 11.1v in there That is why the UK is supposed to get the slower motor than US, though tbh it isn't ultra insane motor reckon you got a 30k or a mofo lipo or a weak spring - suggest you have a rethink... Then speak to shop if they got a direct import and possible spring/juice/motor option Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted April 11, 2016 Supporters Share Posted April 11, 2016 Could just be the deans and fuse removal has left the pathway very clean. Try adding the fuse back in to create some resistance which you should do running 11.1v anyway. Then put a few bursts of full auto through if its a freshly charged battery to deaden it slightly. A lot of well set up guns can double fire when you put a fresh battery in, mine does. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted April 11, 2016 Supporters Share Posted April 11, 2016 Indeed - especially on lower springs, doesn't take much to pre-cock or over-run like you said.... Would advise plopping fuse back in, heck there are some nice fancy blade holders up to 30a that have a led in them to tell ya if fuse blown.. I might not have a fuse in some of my guns but I'm a stupid risk taker on cheap guns so wtf £300 gun with a precision box - no fuse is stupid, I still got fuse in my s/hand krytac Deans will boost 1 to 1.5rps - as shown on youtube then 11.1v fresh off charge - that is quite an increase in power Ease up a bit - a bit of over-run is fine but consistent double firing is sailing a bit close to the wind - even in my wreck it ralph book Link to comment Share on other sites More sharing options...
Guest PT247 Posted April 11, 2016 Share Posted April 11, 2016 never suffered overspin on either of my Krytacs and run both 11.1v/7.4v and 30k/20k motors Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted April 11, 2016 Supporters Share Posted April 11, 2016 never suffered overspin on either of my Krytacs and run both 11.1v/7.4v and 30k/20k motors must be the dmr on 30k & 11.1v A mofo neodym motor might slow a little quicker as the Krytac motor is not an intense mofo neodym motor in there It is a neodym motor but the magnets look black so it appears to be ferrite but they are neodym: but easier to turn than a beefy shs torque - so a silver neodym motor "might" slow quicker than the krytac deffo neo's stop very quickly compared to lame ferrite motors on their own - tbh think the box would slow the weaker ferrite nearly as much Over spin/run happens on lower springs - well even higher springs say m120+ can spin if pushed enough finding the balance or perfect setup is not easy and in any case just adds more work/planning which still might not be 101% perfect (higher speed gearing + higher spring + shortstroking actually makes motor work harder = heat & current draw or shorter battery life) Link to comment Share on other sites More sharing options...
callumbagshaw Posted April 11, 2016 Author Share Posted April 11, 2016 Thank you everybody for your input, that gives me a lot to think about. I'll take it into my local shop and see what they think about it, perhaps putting the fuse back in could help. I did notice that semi-auto was more consistently single shot (not two shots) as the battery ran flatter. Link to comment Share on other sites More sharing options...
Okto Eight Milsim Posted April 11, 2016 Share Posted April 11, 2016 The fuse wont make any difference to how the gun fires but it will save you having a battery fire while youre using the gun if the motor or MOSFET develops a dead short. LIPO's can generate a lot of current and the wires would probably melt and the battery wouldn't be very happy either. Put the fuse back into circuit PLEASE Thank you everybody for your input, that gives me a lot to think about. I'll take it into my local shop and see what they think about it, perhaps putting the fuse back in could help. I did notice that semi-auto was more consistently single shot (not two shots) as the battery ran flatter. Link to comment Share on other sites More sharing options...
Supporters ImTriggerHappy Posted April 11, 2016 Supporters Share Posted April 11, 2016 The fuse wont make any difference to how the gun fires. Actually it can effect the current reaching the motor. Every connection in the wiring creates resistance and while on high voltage system this makes very little difference on an aeg it can have a more noticeable effect. Look at the difference between a tamiya and deans connector. Link to comment Share on other sites More sharing options...
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