ROF Upgrade?

[shadow_matter]

I'm running a TM that comes stock with a Ver.3 gearbox and an EG1000 motor. Since I got the gun I've added a Systema helica gear set, had the mechbox reshimmed, had stainless bushings installed, upgraded the piston and head, and had a moderate spring upgrade so it chronies around 340-350fps.

The problem is that since the upgrades have been installed my ROF has SIGNIFICANTLY suffered with the stock 8.4v battery. I am going to pick up a 9.6v battery this upcoming week, do you think that is enough, or should I go higher? Also, are there any other upgrades that I can put in that will raise the ROF back to the stock level if not better?

[Hedonism Bot]

are you using a 600mah nicad battery?

[shadow_matter]

My 8.4v was a 1500mah NI-MH. The gun is a SG552 so the batts have to stay small, unless I run a box or bag system. Let me know what you guys think.

[The Saint]

If you can fit a 9.6v and still maintain over 1200mah, go for it.

[ThunderCactus]

can you even fit a 9.6 in a 552?
gears will increase you ROF but then it's questionable if your battery will have enough amperage to pull the spring back.
a large battery (3000mah) would definetly solve your problem of ROF though

[Death March]

What ratio of Helical gears,stock or high torque? mAh only gives you more shoots per-pack,but voltage gives you the push your looking for! Voltage is push,mAh's/Current is capacity.I think it worked out to roughly one BB per mAh,in stock form(this is just a guide,not dead on mind you!) and when you upgrade it just goes down from there as theres more Current draw with harder springs= less shoot's per battery! You can go with a high-speed motor or 9.6v battery would help some,but depending on the spring your using,might need that high-torque gear set! I'm not a fan of ROF,it just seems to waste too much ammo,but thats just me.Hope it gives you some ideas on what you what to do with your unit(no jokes Pls. lol),Cheers!

[The Saint]

It's not that clear cut, Death March. Mah is not just capacity, it also influence ROF.

[Death March]

Well you'll get more,run time (for lack of better term,I'm comming from the R/C hobbie lol). But adding mAh alone does not add the "Push" per say by it's self.I know where your going with this,it needs both to a point,but for easy to understand point of veiw,thats all.I'v done a three year electronics program,and thats about as simple as it's going to get with out going into novels of liner current lol. ie. I used a 8.4v battery with a G&P M4SO,shoot at 17 rnd's a sec. switched it over to a 9.6 v gave me 19 rnd's a sec.not a big difference,stock gear box!But as I was saying I know where your going with it,but I just don't see it as being something needed per say in Airsoft! I like the Idea of batterys being cheeper for this sport/hobbie.The R/C batterys were killing me for the price of "pushed cell's".Like I said,to me ROF is over rated for me.Guys don't seem to like it if your using an M-249 @ 400fps with crazy ROF lol.All in fun!My self I like to see what guy's can come up with!We'r all here for the same reason,fun!I hope lol.Cheers!

[WarChild7]

Originally Posted by shadow_matter

I'm running a TM that comes stock with a Ver.3 gearbox and an EG1000 motor. Since I got the gun I've added a Systema helica gear set, had the mechbox reshimmed, had stainless bushings installed, upgraded the piston and head, and had a moderate spring upgrade so it chronies around 340-350fps.

The problem is that since the upgrades have been installed my ROF has SIGNIFICANTLY suffered with the stock 8.4v battery. I am going to pick up a 9.6v battery this upcoming week, do you think that is enough, or should I go higher? Also, are there any other upgrades that I can put in that will raise the ROF back to the stock level if not better?

helical gears are generally (but rather rarely) installed to generate huge torque to pull back a very stiff spring. the last choice of gears for a high ROF setup. high ROF setups also should use bearings rather than bushings. the bearings make a huge difference in reducing friction. the stiffer the spring, the lower the ROF. judging from your FPS, you probably installed a M110. highest ROF will be achieved with either a stock M90 or an M100. most folks would go with an M100 for a little extra FPS boost. a short to medium length barrel is also an essential ingredient, so each BB can clear the barrel before the piston pulls back for the next shot.

we just built a high ROF gun for a customer. 7mm bearing gearbox. M100 spring. high speed gears and high speed motor. stock M4 length barrel. 9.6V 3800mah Intellect crane battery. FPS was 320 with 0.2g BB's. ROF was an absolutely insane 36 BB's per second (according to our chrono)!! it empties an entire 300 round high-cap in just under 10 seconds. most amazing stream of BB's we've ever seen spew forth from a gun. it looked like a clothesline coming out of the end of the barrel. just a solid white line of plastic. far faster ROF than a CA MkII SAW. we put a 5000 round box mag on it and dumped the entire magazine in under four minutes, including the time to stop and wind it.

[shadow_matter]

I'm not looking for a ridiculous ROF, but something that gets me back up to the stock rate. The spring increased my fps by 50 or so, I put the Systema gears in for reliability. I can fit a 9.6v 1200mah battery in the foregrip, but do you think it is worth while for me to re-wire and spring for a battery bag with a large 9.6v battery? Capacity doesn't really matter in the sense that I can charge the pack during lunch. Does the total Mah significantly affect the discharge rate, enough so to warrant the switch to a parge size and batt. bag?

[ILLusion]

You might want to look into getting a Systema Magnum motor.

Then you won't have to deal with larger batteries that may not fit and what not.

The Magnum motors have EXCEPTIONAL torque with a slight boost in ROF.

[LUTNIT]

There is an aftermarket handguard you can get that can hold a 9.6V mini.

[shadow_matter]

Where is this handguard you speak of?? I've been searching around for something like that! I already dremmeled out the inside of the stock one to fit a 1500 8.4v.

[CDN_Stalker]

Increasing the mAh of the battery has a huge effect on the rate of fire. Period, can't argue the point. I run an 8.4V 140mAh battery in my spare MP5, has a 110SP spring in it, and it has a great rate of fire, maybe 800rpm or so. When I've used it with my main MP5's 8.4V 3300mAh battery, I swear the rate of fire goes up to 1000 to higher rounds per minute. Literally, it's a white line of BBs that comes out.

The more current available, the more the motor will draw for a certain load. Gears, spring, etc. will increase the load, but providing more current ability means the motor can work faster.

[ancorp]

Seeing how airsoft is about realism, I cant understand people doing upgrades like that 36bb a second m4, and playing with Hi-caps. This is becoming Speedball.