Guest Pfc.Macdonald.J Posted May 5, 2017 Share Posted May 5, 2017 Evening. Excuse my unfamiliarity, but i've had some head scratching moments with some spring upgrade of late. I recently bought a Nuprol Delta Recon Alpha, shoots at 320fps quite consistently. I fancied a few more fps to content with some .25s i want to use for windy outdoor games. So I ordered an Nuprol m110 and on swapping my stock out, expected to shoot around 360fps as advised. Shot 390 pretty solidly. Not to be discouraged, I got hold of a nuprol m100 and did the same. Shot at 390, solidly. Stumped... Both new Nuprol springs measure a full inch and a half longer than the stock @approx 61/2' or 650mm, so when installed they are very compressed. The stock spring is shorter and therefore less compressed on install. Anyone have any nuggets of wisdom? Anyone have experience upgrading a Nuprol AEG? Used an Xcortech chrono .20g bbs on test 9.6v battery Link to comment Share on other sites More sharing options...
newsh Posted May 5, 2017 Share Posted May 5, 2017 The first thing that comes to mind is that they are both M110 and one was mislabelled might be worth trying another M100? Link to comment Share on other sites More sharing options...
Guest Pfc.Macdonald.J Posted May 5, 2017 Share Posted May 5, 2017 6 minutes ago, newsh said: The first thing that comes to mind is that they are both M110 and one was mislabelled might be worth trying another M100? Definitely a possibility. Any thoughts on what made them shoot that fps though? It's high for those spring ratings no? Link to comment Share on other sites More sharing options...
Mr Monkey Nuts Posted May 5, 2017 Share Posted May 5, 2017 4 hours ago, Pfc.Macdonald.J said: Nuprol There is your issue! Link to comment Share on other sites More sharing options...
Supporters Lozart Posted May 8, 2017 Supporters Share Posted May 8, 2017 Pretty much every aftermarket spring I've bought has been longer than the stock one it replaces. Link to comment Share on other sites More sharing options...
Guest PT247 Posted May 8, 2017 Share Posted May 8, 2017 try a different brand spring. Supposedly the Nuprol AEGs are very efficient so science may make their springs perform better than they should but that makes no sense to me Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted May 8, 2017 Supporters Share Posted May 8, 2017 Some possible scientific theory crap...... The springs are most likely under-rated by that I mean they could be like Guarder SP100 Springs = a M110 (the rating is for 0.25's or they use the heavier bb when chrono) So you probably got higher springs that you first thought on the box Also from what I can gather the gun might have bearing/spacer on piston head and very likely abearing quick change spring guide - these two will compress spring more Thus will compress spring more = slight/moderate increase in fps The box or guns do seem to have pretty decent seals - efficient or no real crap loss of fps Also the gun's barrel seems to be about 363mmor a smidge over 380mm - not sure on exact length but not losing expected fps like you can expect on shorter barrels sub 300mm BUT - it appears to have a tight bore 6.03mm as standard so fps will creep up a little Why both springs shooting the same fps ??? Yes could be the same springs - can/does happen mislabeling of springs But - another factor is the bucking lips blowing out Softer buckings or if the nozzle just about seals lightly then the lips can reach a point that they blow at Not really experienced this myself but saw posts at Airsoft Mechanics about same fps on m120/130 etc.... shave tappet plate and/or harder bucking seemed to solve the under expected and similar power on heavier springs BUT - you don't have to worry about this crap coz 390fps is above UK field limits (just throwing a possible reason why both springs might be producing same results) What you could try..... On irregular springs: Refit the original spring but instead of fitting tighter coils to back of box/spring guide fit tighter coils up at piston/nozzle front of gearbox instead fitting the spring ar$e about face should increase fps but only about 10fps I found can't do this really if it is a regular spring purchase say an Element M95 spring or SHS M100 though I have a gut feeling the SHS might be over but the M95 might be OK for a while as the longer tbb but think the element springs fade a bit more I'd try to refrain from spacing the spring or stretching the spring spacing could be risky if the piston head spacer/bearing is getting close to bottoming out inside You could put on a spacer ring/collar to spring guide like they sell/use on DSG's but only need a slight ring spacer I'm guessing a 3mm to 5mm spacer aprox 15mm max outer diameter & whatever ID the spring guide is can't be much larger OD coz inside of piston has to fit over this (need to be very careful as stated the spring doesn't bottom out - I'd stick with say 3mm max (one extra tooth compression) I'd get your hop set for decent quality 0.25's Then I think you box has to be removed to do a quick spring change so fit grip on box and get box working, pop in ar$e about face original or m95 spring with 3 pairs of hands try to prep hop/barrel with bb and chrono bare box/barrel (will take a few attempts but you should get a decent idea @ chrono before you refit) think you are looking at either trying say m95 or refit old spring in reverse perhaps to squeeze 10fps out I tried to explain possible reasons why the higher than expected fps and if springs are not the same why fps remains @ 390fps due to lips blowing maybe as usual went right off on a tangent and by now most people are slipping into a coma reading this crap hope some of this helps but most likely it doesn't - best of luck Link to comment Share on other sites More sharing options...
[email protected] Posted August 21, 2017 Share Posted August 21, 2017 unrelated topic but does anyone know how to actually change the spring on a nuprol m4 Link to comment Share on other sites More sharing options...
Guest PT247 Posted August 21, 2017 Share Posted August 21, 2017 if it is a V2 gearbox (which I imagine it is) changing the spring will be pretty much the same as most other M4's Have a look on YouTube for guides, there may even be one for your specific AEG Link to comment Share on other sites More sharing options...
Cutrimson Posted August 27, 2017 Share Posted August 27, 2017 I thought the Nuprol Delta series had the quick change spring with the v2 gearbox? So wouldn't that be accessible from the rear stock ? Link to comment Share on other sites More sharing options...
[email protected] Posted August 27, 2017 Share Posted August 27, 2017 4 hours ago, Cutrimson said: I thought the Nuprol Delta series had the quick change spring with the v2 gearbox? So wouldn't that be accessible from the rear stock ? it does but annoyingly i think you have to take out the whole gear box to change it out... i took off the stock and everything but not even a standard spring will fit intot he tube Link to comment Share on other sites More sharing options...
Cutrimson Posted August 27, 2017 Share Posted August 27, 2017 25 minutes ago, [email protected] said: it does but annoyingly i think you have to take out the whole gear box to change it out... i took off the stock and everything but not even a standard spring will fit intot he tube That sux Link to comment Share on other sites More sharing options...
Guest PT247 Posted August 27, 2017 Share Posted August 27, 2017 at least you don't have to split the gearbox! Getting a V2 box out is easy though, jump on youtube and do a quick search, loads of vids on it. Link to comment Share on other sites More sharing options...
NuprolDan Posted August 30, 2017 Share Posted August 30, 2017 The Nuprol range are dead easy to work on. Link to comment Share on other sites More sharing options...
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