Improving trigger response (AKS-74U)

[GR]

Good day.

I've been reading up on upgrades, however, didn't find a definite answer. I'm looking to increase trigger response on a stock Echo1 AKS-74UN (w/ M90 spring).

So far, my plans are to use a SHS or G&P High Torque Motor, and get a 9.6V 1600 mAh NiMH battery (yes, I'm still running 8.4V stock...), however, I'm not sure if this combination will create the desired result.

I was also thinking if a MOSFET could give something here, however, I didn't research this area enough.

Any help would be highly appreciated!

Motor example:
http://airsoftdepot.ca/catalog/produ...qluj1kqajshdi5

[lurkingknight]

how do you define trigger response? I argue with people about this a lot.

Generally trigger response is regarded as the time it takes for a full cycle to complete and stop once you pull the trigger. Not when the motor begins to turn.

So if you're looking for a fast cycle speed, yes a faster motor will work. But your battery is not powerful enough to run most neomagnet motors without either starving the motor or heating up the battery.

There's 3 ways to improve the cycle time.

bigger battery.. more volts, more mah, less resistance in the battery cell. However you accomplish this, is up to you. Less resistance in the system is ALWAYS better. that means a mosfet to reduce resistance at the trigger contacts, less resistance with deans or xt60 connectors, higher quality wiring.. etc.

mechanical gearing... faster gear ratios... fewer turns of the pinion gear from the motor equating to more rotation of the sector gear, you need more juice or more umph to do this, but with an m90 it won't matter.

more motor... more motor usually requires more power, but going more motor means it overpowers the mechanical resistance, and you'll start getting more than one cycle per trigger pull due to the speed of everything spinning. It's even possible to get 2-3 shots on a semi auto trigger pull... that's called overspin.

Supporting mods first would be a rewire with basic mosfet, go to 9.6v nimhs or lipos for higher discharge rates. If you're still not happy with that, then put bigger motor in, but you'll screw up your semi, at that point you need to see someone who knows how to shortstroke your setup so you run a tougher spring but shorten the piston draw to use less air to get the fps your m90 is getting.

If you're STILL not happy with that, then a faster gearset, stock is somewhere around 18:1 or 19:1. Slightly faster is 16:1 and even faster is 13:1 There are a few 12:1s and a 10:1 on the market but the 10:1s are way too expensive for most people.

Get the gearbox properly shimmed when you have it rewired, else you'll be replacing gears soon enough.

The drawbacks for going faster cycle speed is that your rate of fire will come up as a side effect, as both are directly impacted by the 3 things mentioned.

[ShelledPants]

There is a forth way, which is reducing the distance the trigger moves between semi cycles. Which is super important. I'm a little drunk so the specifics are vague. Google "hair trigger mod for AEG's".

[Comeau-SCS]

For the motor you specify, I have overspin in semi with a M110 and 11.1 volt battery without a active braking mosfet. With a M90 I would guess you'll have the same problem. Otherwise just follow lurkingknight's advice.

[GR]

Thanks for all the great replies, it will take me some time just to work through that info.

Originally Posted by Comeau-SCS

For the motor you specify, I have overspin in semi with a M110 and 11.1 volt battery without a active braking mosfet. With a M90 I would guess you'll have the same problem. Otherwise just follow lurkingknight's advice.

Thanks for the reply. I'm planning on getting a 9.6 volt NiMH, think there still would be overspin?

[pestobanana]

Originally Posted by GR

Thanks for all the great replies, it will take me some time just to work through that info.


Thanks for the reply. I'm planning on getting a 9.6 volt NiMH, think there still would be overspin?

Overspin always happens. If you're talking about double shooting, then that is an issue with cutoff timing. Pry your contacts a bit further apart, and make sure your cutoff lever is not worn.

Also this:

https://www.facebook.com/groups/real...2764926361325/