Quote:
Originally Posted by Skruface
Many people assume that if they throw enough money into upgrades, the guns will run perfectly forever...this is simply not true. These guns, from the factory, were never designed to be upgraded. As soon as you start upgrading, you reduce the lifecycle of every single part in the mechbox. I've been tinkering with these thing for the better part of a decade, and let me assure you, there is no gun that will run forever (although I have a totally stock TM AK47 that has seen in excess of 200,000 rounds).
So, here's my advice to you.
PDI springs are very inconsistent. I'd go with a Modify or Prometheus spring, personally.
The G&P M120 is a good motor, but not necessarily for your application. G&P rates its motor by spring power, so it's designed for an M120 spring....you're looking more at M130/M140 range with your choice of FPS. Personally, I would use a G&P M140 Torque motor, or even an M160 Supercharger. I have found the quality of Guarder motors is hit-and-miss, but I have all 3 types of G&P motors (120, 140, 160) and all have been great.
The cylinder - you will want to replace the M4 cylinder with a MC51 cylinder. Matching your cylinder's internal volume to the barrel length/volume is critical.
Using 6mm bearings in a high-fps gearbox is a recipe for disaster. Either buy an 8mm bearing gearbox and use high quality ceramic bearing (like Kanzen) or just use plain steel bushings...or, go with Modify Modular gears.
Your gear choice is fine for this setup, although I am not a big fan of Pheonix's "self shimming" setup - what happens when a spring wears out (and all springs WILL wear out)? I'd suggest looking at the Modify modular gearsets - roughly the same price as Systema, and just as good, but you won't have to mess around shimming them. You can get a High Torque set of these gears with a ratio of 21.6:1. I use these in almost all my guns now. Prometheus also make excellent gears. I'd also pick up a stock Tokyo Marui v2 gearbox shell (they can be had for about $40).
Since version 2 mechboxes all have the same design flaw (the front end inevitably breaks in cold weather and with a high-fps spring), you will also have problems with this. Since you are using a G&P metal body already, it would be worth picking up an Ajax Customs Shock Transfer System. A small price for a good investment.
I personally would not use a all-metal tooth piston. In non-stock setups, the piston is generally the part you want to wear out first....it's cheaper to replace a $20 stock TM piston than a $100 set of gears, as you now know.
You mention having a Systema hopup, but not which hopup rubber you use. I prefer Prometheus Hard, or, (assuming you can find it) a Firefly "Kurage/Spicy" hopup rubber.
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Thanks for your advice, I really appreciate it...
My first upgrade has been made by WGC shop so i was not exactly sure about my internals, so I made a deep search and found this:
(my current internals)
Guarder (accoring to WGC upgrade plan) or
G&P metal Hop/up unit (according to visual comparation - no guarder sign on it), not sure about rubber, probably original GP
7 mm steel bushings/bearings - probably original GP
Systema teflon cylinder set I think cylinder size is suitable for 285 mm long barrel (not planning to get longer)
Systema gears
Guarder Air nozzle - bore up (larger hole diameter than standard)
Guarder enhanced tappet plate
Steel spring guide
Now back to your answers...
About PDI spring, I heard only the best, so I am little bit suprised with your advice... So which Prometheus spring is equivalent PDI 210 or rather fps 420 with these internals? How about the length? I bought guarder m130 and there were no way how could I put it in...too long. PDI is about 16 cm long.
GP M140 motor was also my first choice then I read somewhere that is not powerfull enough comparing to m120, so i will probably go with m160, i am just little bit afraid of too high rof, hopefully gears with 21,6 ratio will slow it down...
Cylinder - as I said, I see no reason to change it.... Enough volume for 285 mm long barrel
About bearings/bushings - it is steel, it is 7mm, but not sure if bushings or bearings, probably original GP - How can i see the diference? Is it enough for M130 spring?
Would you recommend to change hop up rubber??
I found Phoenix new Shock absorbable design gears quite interesting, but does it really works or is it just theory??? Price is also not really small... $96
I can use standard shimming insted of small springs anyway..
Ajax Customs Shock Transfer System is very interesting piece of HW, but for that price I can have brand new gearbox.... And i am not planing to get to 560 fps in freezing weather...
That piston cost me $50 usd, i am not planing to replace it. I already broke brand new systema piston just after few shots... This one is still good as new...