scar527 Posted August 14, 2008 Report Share Posted August 14, 2008 I am planning on using 134a gas in my gas rifle, and am a bit confused about the fps difference from green gas. I have heard 100 fps(550 on green-450 on 134a) and i have heard 50fps. I have even been told 150 fps which is definantly not true. I would greatly appreciate some anwsers that cn be backed by chrono readings. THANK YOU for your help. Link to post Share on other sites
tome Posted August 15, 2008 Report Share Posted August 15, 2008 I seem to remember my Tanaka AICS with PCS fully open giving about 400fps on 134a and about 550+ on Green gas when i was going some tuning with a chrono. Maybe i had weak 134a Link to post Share on other sites
ED-SKaR Posted August 15, 2008 Report Share Posted August 15, 2008 the difference between green and duster is not 'xfps', it is a percentage or ratio. I have heard it said that green gas is seven sixths of duster, or that duster is six sevenths of green. When using lower FPS there will be a 50fps difference, when using higher there will be 100fps increase (and in extreem high, beyond safe airsoft i imagine, you'd get 150 difference) Also different pressures can have different charicteristics in the same gun, causing more or less difference than the preasure allone should cause. also temperature is a consideration. What gun are you using, and what is its FPS on green gas? Link to post Share on other sites
scar527 Posted August 15, 2008 Author Report Share Posted August 15, 2008 the difference between green and duster is not 'xfps', it is a percentage or ratio. I have heard it said that green gas is seven sixths of duster, or that duster is six sevenths of green. When using lower FPS there will be a 50fps difference, when using higher there will be 100fps increase (and in extreem high, beyond safe airsoft i imagine, you'd get 150 difference) Also different pressures can have different charicteristics in the same gun, causing more or less difference than the preasure allone should cause. also temperature is a consideration. What gun are you using, and what is its FPS on green gas? I am using a tanaka m700, and it shoots 550 on green. However, it has a vsr barrel(554mm) and hopup. I dont know how much that wouldaffect the fps though. My local tech said 50 fps for my gun but i am trying to confirm that. Link to post Share on other sites
scar527 Posted August 15, 2008 Author Report Share Posted August 15, 2008 O yeah and where i live its usally 70-80 Farenhiegt(excuse my spelling) Link to post Share on other sites
ED-SKaR Posted August 15, 2008 Report Share Posted August 15, 2008 given my experiance with chronoing gas pistols and multiplying the numbers you [should] get between 450-500, i would guess closer to 450. However the best answer would be to go and do it. However my previous post is wrong on one important point, it is not the FPS that varies with relation to other FPSs with differing gasses, its the POWER. so the POWER decreaces a certain ammount, and that means the FPS will change given the equasion: Ek= .5 * m * v^2 [edit, with some quick calculations with imaginary numbers i recon 450 will be a good estimate] Link to post Share on other sites
scar527 Posted August 15, 2008 Author Report Share Posted August 15, 2008 given my experiance with chronoing gas pistols and multiplying the numbers you [should] get between 450-500, i would guess closer to 450. However the best answer would be to go and do it. However my previous post is wrong on one important point, it is not the FPS that varies with relation to other FPSs with differing gasses, its the POWER. so the POWER decreaces a certain ammount, and that means the FPS will change given the equasion: Ek= .5 * m * v^2 [edit, with some quick calculations with imaginary numbers i recon 450 will be a good estimate] As long as it shoots above 450, ill be happy. But your not 100% sure though? I am guessing 70fps. Thank you for your help, ill get back to you as soon as i test it. BTW what kind of rifle do you have(or do you only have pistols?)? Link to post Share on other sites
scar527 Posted August 15, 2008 Author Report Share Posted August 15, 2008 Excuse me i meant as long as it shoots 450 or higher. Link to post Share on other sites
scar527 Posted August 16, 2008 Author Report Share Posted August 16, 2008 more anwsers are still appretiated! Link to post Share on other sites
ED-SKaR Posted August 16, 2008 Report Share Posted August 16, 2008 I do some (a little) work on pistols, mostly GBB, i have fixed 4 glocks in the last year (just to show, not to bragg ) my knowlage of rifles as apposed to handguns is limited to conjecture. if you where to scale up my knowlage of NBB pistols (as yours is a NBB rifle) then what i said above is a good guess, nothing more. Still my best statement is that you should just get some duster and try it. Link to post Share on other sites
scar527 Posted August 17, 2008 Author Report Share Posted August 17, 2008 I do some (a little) work on pistols, mostly GBB, i have fixed 4 glocks in the last year (just to show, not to bragg ) my knowlage of rifles as apposed to handguns is limited to conjecture. if you where to scale up my knowlage of NBB pistols (as yours is a NBB rifle) then what i said above is a good guess, nothing more. Still my best statement is that you should just get some duster and try it. I hae decided i will in the future, but not right now because i recently found out my sites fps limit is actually 575 so i should be good their. I thought t was 500. Hweverf THANK YOU fo all of your help. Link to post Share on other sites
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