Calculating FPS with upgrades

[Panoptes]

How do you go about calculating eventual FPS when you're adding both a tightbore and a spring?

I'm about to add a Prommy 6.03mm and a Guarder SP120 spring to my HK416 (363mm). It's currently firing at 319fps - will these two push it over 381fps?

It currently has a stock barrel and, I'm assuming, a stock 1J spring.

[deanfirst]

Re: Calculating FPS with upgrades

what is your original spring??

are you sure you want to use that barrel in your HK416? you need to change a full sized cylender. the long length barrel could cause a lot of trouble.

[hoggy21]

Re: Calculating FPS with upgrades

Coke can test

[jagillham]

Re: Calculating FPS with upgrades

I assume the above is a joke

I'm pretty sure I heard the Guarder springs are stronger than other makes, so that M120 might give more of a kick that you expect.

As a guesstimate, my M105 with 6.03 madbull 363mm was giving 350 - 355. Barrel compression should be the same. So with that M120 you'll be up there in 370-380 I'd think.

As you know, the FPS isn't really a factor in performance. So I'm assuming anything from 360 to 380 would be acceptable?

[Panoptes]

Re: Calculating FPS with upgrades

Original spring as stated is 1J (stock).

Why do I need to change the cylinder? Never had to before on any other AEG (and they all hit far and hard).

[Panoptes]

Re: Calculating FPS with upgrades

As you know, the FPS isn't really a factor in performance. So I'm assuming anything from 360 to 380 would be acceptable?

Yeah, I'll be aiming for around that mark.

I've seen figures for tightbores giving 10-15 'something' - is that figure '%' or extra fps?

I guess an SP120 = +20% on fps?

[richardy]

Re: Calculating FPS with upgrades

experience.. failing that, try it and see method.

[hoggy21]

Re: Calculating FPS with upgrades

I assume the above is a joke

I'm pretty sure people know my feelings on coke can tests by now...

Pan, if you don't mind me asking, why 381fps?

Tightbores are about 10-18fps. Ive got a 6.03 tightbore in the Sopmod, and it did 11-13fps increase. But also fitted a new spring at the same time...

[Panoptes]

Re: Calculating FPS with upgrades

experience.. failing that, try it and see method.

Of course, but I'd like to minimise the times I have to open up the gearbox, re-close, reassemble, open up, re-close, reassemble. It all takes its toll. getting it right first time saves a lot of grief.

Pan, if you don't mind me asking, why 381fps?

I always aim for the legal limit then it settles down nicely to around 360 ish after a while.

Tightbores are about 10-18fps. Ive got a 6.03 tightbore in the Sopmod, and it did 11-13fps increase. But also fitted a new spring at the same time...

So you reckon I should be on the nail with the 120 and the TB then (from stock 319fps)?

[hoggy21]

Re: Calculating FPS with upgrades

Well 319 adding the tightbore will bring you up to anywhere between roughly 329 - 337, and thats just roughly. You using .20?

God this is playing devils advocate! I dont want to say something, and it be wrong, and then get into trouble for telling you it was a fact!

Try the 120, but have a 110 just incase it seems to be a bit OTT. Once bedded in i cant see a problem. And where do you play that allows a 360fps gat?

[Panoptes]

Re: Calculating FPS with upgrades

We allow 380 - right up to the legal limit. Keeps you on your toes!

It's a private, MoD only site.

Cheers.

[richardy]

Re: Calculating FPS with upgrades

i put my vote for an sp110 and a promy barrel..

m rule - 110 x 3.3 + 10 for the barrel = 373 fps..

you could go more and apply a lot of hop up... it will usually bring it down incrementaly the more spin you add.

[Panoptes]

Re: Calculating FPS with upgrades

Damn. Just realised 110 = 110mps. :eek: Always thought Guarder's system meant: 100% (of 1J) +10%. Ah!..... Nice one, thanks. Yeah, the 120 and TB would probably be mental (406fps) as I think this baby's got a good airseal... so 110 it is (373 approx with the barrel).

[richardy]

Re: Calculating FPS with upgrades

Guarders have been known to be a little stronger, but id still stick with the rule... its gunna be ruffly what you want.. at least your somewhere near..

Let us know how it goes

[hoggy21]

Re: Calculating FPS with upgrades

I was thinking a 120 would be a teeny bit hot.

Can i play? :p I only ask because im moving away from GZ, due to work commitments! Where's it at? PM me when you get the time!