9.6v + systema turbo coupling problem

[Big Pepa]

I'm not a pro but I'm a pretty good amateur gearbox mechanic. I recently upgraded my gear box and put a bunch of stuff in. Here's the list of the parts that are pertinent to this thread.

prometheus torque - up gears
ms90 spring - non linear
systema turbo motor

Now... I know that some people are going to say ... wtf torque-up gears with an M90 spring and a turbo motor??? The thinking behind the torque gears is that I don't want too crazy of a ROF. I don't want to go through pistons every other game. An metal toothed piston is also not an option because I would rather destroy pistons then gears. Maybe I made the wrong decision... I don't know.

Anyway, my problem is that when I shove in the 9.6 v battery pack and fire on semi the gears over rev. I know, the torque from the motor and the gears are pushing on a M90 spring and thus the spring is not strong enough to stop the cycle at the end of the revolution. I know this because when I put in my 8.4v battery semi works just fine.

I would love a higher rated spring such as a M110 but unfortunately, in Japan where I live, anything above m90 is illegal. Also, it's a cqb gun and I don't want to hurt my friends when I shoot them. As it is, they all get nice little welts when I shoot them at close range.

I really would like to shove the 9.6 pack in as trigger response is crisper with it. Any suggestions? I don't know much about mosfets' etc... would any sort of electrical component help? Should I just suck it up and leave the 8.4 in there?

Thanks in advance

[m102404]

Active Breaking MOSFET. SW-COMP (cheeta/panther or some other animal...).

DonP makes them locally in Canada and is a top notch guy. Extremely helpful.

Terry (Gandalf) on the airsoftmechanics forum designed them...and sells them from his site extreme-fire.com. There's more than full details about how they work on airsoftmechanics...but it made my brain hurt to read through it all.

Best of luck,

Tys

[Big Pepa]

Great!! thanks for the quick response

I'll read into it right now.

[Big Pepa]

Ok, I looked into that cheetah fet thing and it looks great and probably is just what the doc ordered BUT....

I live in Japan so it's not easy to get that out here. What I can get is something called a duel fet from http://www.first-jp.com/items/11/04/...e=1104FIR00001

It's all in Japanese but they don't say much about it. They advertise it as something that will increase your RoF. I'm not so concerned about that as my systema turbo motor gives me much more then I need.

New question... do all these factory made FET's come with active breaking?

[m102404]

No...if you troll through Extreme-Fire's site/products...you see a "plain old FET"...it's not much. There's also more complicated MOSFETs without active breaking.

The active breaking component is another couple of circuits.

You might want to post up on Airsoftmechanics and ask for a local source...some of those guys are really into it.

Myself...I just know that it works and know how to use/install/run them properly.

Sorry I couldn't be of more help,

Tys

[Big Pepa]

Thanks again for the help.

I'll have to look more deeply into it for a solution out here. Going to have to get my wife to translate for me... when she finds out I'm going to spend more money on my gun she's going to turn into something more scary then a m190 spring at 2m.:banghead:

[sopmod]

Hi, Big Pepa..

I think you are problem is the motor. I had same problem with my gun after i installed high speed motor with regualr torque gear and m100 spring. I shot with 9.6v and it kind a over rev the gear.

Hence,I suggest to install TM EG1000 motor and shot with 9.6v. I believe you still get sharp semi response. That's the set up I used when I was in Japan. =)

[sopmod]

Originally Posted by Big Pepa

Ok, I looked into that cheetah fet thing and it looks great and probably is just what the doc ordered BUT....

I live in Japan so it's not easy to get that out here. What I can get is something called a duel fet from http://www.first-jp.com/items/11/04/...e=1104FIR00001

It's all in Japanese but they don't say much about it. They advertise it as something that will increase your RoF. I'm not so concerned about that as my systema turbo motor gives me much more then I need.

New question... do all these factory made FET's come with active breaking?

About the Duel Fet, I have read about it on Arms Magazine before. it only used for high speed set up with at least 11.2v.

[Big Pepa]

Yeah I know, the systema turbo has a high torque rating but that's actually not the problem. Too much power is being fed to it when I put in the 9.6 pack. The 8.4 runs just fine and the gun is a bb hose with the 8.4.

I've been reading on the mosfet's with active breaking and it seems it is exactly the solution that I need. The active breaking acts as a power cut off and it basically stops the gears from hitting the piston and over-reving it.

You are right though... If I knew before I wouldn't have blown the cash on the systema turbo, and I would have went with the EG1000 + 9.6. It's a much cheaper and more effective solution then the systema turbo, mosfet (espicially since I have no clue where to get one out here) and the 9.6.

Problem is I already bought the motor and I don't want to put it in my toolbox to collect dust.

[Big Pepa]

know if it has active breaking on it? (the duel fet)

don't really care for more speed but if it has active breaking I'll buy one immediately.

[sopmod]

what is active breaking?

[Big Pepa]

when the gear cycle completes its revolution it takes time for the motor to slow down due to inertia. If you have a mosfet with active breaking the active breaking switch sends a negative currant to the motor when the sector gear clears the piston. This negative currant acts as a break. It physically slows down the motor and does not allow the sector gear to re-establish contact with the piston.

This in turn allows the piston to go back to its rest position after each cycle of the gears. It's really important - especially for high speed setups like mine.

that's sort of the layman explanation.

[Big Pepa]

Originally Posted by m102404

Active Breaking MOSFET. SW-COMP (cheeta/panther or some other animal...).

DonP makes them locally in Canada and is a top notch guy. Extremely helpful.

Terry (Gandalf) on the airsoftmechanics forum designed them...and sells them from his site extreme-fire.com. There's more than full details about how they work on airsoftmechanics...but it made my brain hurt to read through it all.

Best of luck,

Tys

Thanks M102404

I ordered a Cheeta from the guy... turns out he ships internationally.