Twrecks Posted April 20, 2013 Share Posted April 20, 2013 Im building a custom M4 with a ascu gen 3 in it im using a G&G ver2 gearbox before I put the ascu in it it was shooting 389-390 fps and now that i have the mosfet into the gun im getting 300 fps and i have a m120 spring. So im not sure why the gun would lose fps just from putting the ascu unit in the gun. Link to comment Share on other sites More sharing options...
-Rogue- Posted April 20, 2013 Share Posted April 20, 2013 (edited) The ACSU (or electronics for that matter) have nothing to do with FPS. When you installed it, you lost seal on your cylinder head to cylinder or, more likely, your piston to the cylinder. Replace or stretch your piston oring and report back. Edited April 20, 2013 by -Rogue- Link to comment Share on other sites More sharing options...
Twrecks Posted April 21, 2013 Author Share Posted April 21, 2013 it has a good air seal but it like it does not seem like it make a full cycle like a 1/2 stroke Link to comment Share on other sites More sharing options...
targetpractice Posted April 21, 2013 Share Posted April 21, 2013 Hey fella, you might want to introduce yourself at the Introductions thread. People here are more apt to offer help if they know you. Link to comment Share on other sites More sharing options...
targetpractice Posted April 21, 2013 Share Posted April 21, 2013 And on that note, is it possible that you might have misplaced a shim or two when you disassembled the gearbox, enough to cause the gears to "slip?" That's what I thought when you said it sounded like a 1/2 stroke. Link to comment Share on other sites More sharing options...
starblade54 Posted April 21, 2013 Share Posted April 21, 2013 it is most DEFINITELY an air seal issue. an M120 should NOT be getting 300 fps unless you put a DSG setup into it. something wasnt replaced right in your gearbox when you took it apart to install the ASCU and then reassembled it. Link to comment Share on other sites More sharing options...
Twrecks Posted April 21, 2013 Author Share Posted April 21, 2013 surry for not introduceing myself - hi and im my name is thomas or you can call me by my nickname twrecks and i thought it was the shim so i reshimed it and it still did it Link to comment Share on other sites More sharing options...
Twrecks Posted April 21, 2013 Author Share Posted April 21, 2013 here it is but as you can tell in the video my air nozzle juest broke off good thing i have anuther Link to comment Share on other sites More sharing options...
hrturner Posted April 21, 2013 Share Posted April 21, 2013 it has a good air seal but it like it does not seem like it make a full cycle like a 1/2 stroke What? PLEASE PLEASE PLEASE use proper English..... And on that note, is it possible that you might have misplaced a shim or two when you disassembled the gearbox, enough to cause the gears to "slip?" That's what I thought when you said it sounded like a 1/2 stroke. Cant happen, the angle at which this would happen would be almost beyond 45 degrees. If your gears are moving that much your gun wouldn't fire anyways. If you are short stroking then you are missing teeth on the piston, plain and simple. Take it all apart again, teflon tape your cylinder head and install it back int o the cylinder, go out and buy a #14 o-ring from lowes/home depot/menards install it on the piston, reassemble the gun and CHRONO it. Judging FPS loss by simply looking at the gearbox firing is next to impossible. Link to comment Share on other sites More sharing options...
Twrecks Posted April 22, 2013 Author Share Posted April 22, 2013 thank you guys for your help. Link to comment Share on other sites More sharing options...
Twrecks Posted April 23, 2013 Author Share Posted April 23, 2013 Take it all apart again, teflon tape your cylinder head and install it back int o the cylinder, go out and buy a #14 o-ring from lowes/home depot/menards install it on the piston, reassemble the gun and CHRONO it. Judging FPS loss by simply looking at the gearbox firing is next to impossible. I did that and it was shooting 340 - 358fps then the bb's started to roll out and the motor got warm. Link to comment Share on other sites More sharing options...
hrturner Posted April 24, 2013 Share Posted April 24, 2013 BB's rolling out of the barrel means that it is loading too many at once. Try turning your hop-up off and see if you still have low FPS and multiple bb's in the chamber. As for the still low FPS, could be a result of your hop-up not meshing against the GB well or you are still leaking around the air nozzle (may be cracked or missing it's internal o-ring). Link to comment Share on other sites More sharing options...
Twrecks Posted April 24, 2013 Author Share Posted April 24, 2013 BB's rolling out of the barrel means that it is loading too many at once. Try turning your hop-up off and see if you still have low FPS and multiple bb's in the chamber. As for the still low FPS, could be a result of your hop-up not meshing against the GB well or you are still leaking around the air nozzle (may be cracked or missing it's internal o-ring).but wood that make the motor get hot? Link to comment Share on other sites More sharing options...
hrturner Posted April 24, 2013 Share Posted April 24, 2013 Hot is a subjective term. Looked at a setup this weekend that someone thought was getting hot and it was normal given the gearbox setup and the battery being used. Do you have an actual temperature reading? Link to comment Share on other sites More sharing options...
Twrecks Posted April 24, 2013 Author Share Posted April 24, 2013 (edited) Hot is a subjective term. Looked at a setup this weekend that someone thought was getting hot and it was normal given the gearbox setup and the battery being used. Do you have an actual temperature reading?noi put the g&g hop-up back in it and there not rolling out but the fps is 319-325 and what size o-ring is the air nozzle Edited April 24, 2013 by Twrecks Link to comment Share on other sites More sharing options...
hrturner Posted April 24, 2013 Share Posted April 24, 2013 What? You swapped in your G&G hop-up? Are we talking about two different hop-up units? Link to comment Share on other sites More sharing options...
SASQUATCH Posted April 24, 2013 Share Posted April 24, 2013 noi put the g&g hop-up back in it and there not rolling out but the fps is 319-325 and what size o-ring is the air nozzle Ding ding ding! I think we found the problem. You've more than likely found a way to get a bad air seal in whatever Hop-Up you installed. Link to comment Share on other sites More sharing options...
Twrecks Posted April 24, 2013 Author Share Posted April 24, 2013 (edited) What? You swapped in your G&G hop-up? Are we talking about two different hop-up units?ya i have two the g&g and and a Madbull Airsoft Ultimate Hopup. The madbull one i got wen i got the Madbull Daniel Defense Metal Body and i have been using it and using it befor i had the prolem Edited April 24, 2013 by Twrecks Link to comment Share on other sites More sharing options...
hrturner Posted April 24, 2013 Share Posted April 24, 2013 Put the one that gave you good FPS back into your gun and turn the hop-up all the way off. Then see what happens. Link to comment Share on other sites More sharing options...
Twrecks Posted April 24, 2013 Author Share Posted April 24, 2013 (edited) 330fps then thay start rolling out and this is my last post for the day Edited April 24, 2013 by Twrecks Link to comment Share on other sites More sharing options...
Twrecks Posted April 29, 2013 Author Share Posted April 29, 2013 what'd to say thank you all for the help and it was not the air seal. It was the engagement of the piston to the gears. thanks for all the air seal help cuz it's shooting to hot 425fps and I think this topic can be closed now. Link to comment Share on other sites More sharing options...
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