Spring Comparison Chart - Updated April 1st, 2006

ILLusion · August 27th, 2004, 16:13

I'm considering getting my hands on a brand new PDI 170% just so I can test it out on my platform... the last time I worked with one, it was putting out close to 430fps. Although I don't want to buy one just to test since I know I'll have a hell of a time trying to sell it.

The materials between the 170% and 150% must be different, hence the different lengths.

Trader rating · February 12th, 2005, 19:45

Ok, so im getting confused with all this.
Im stock right now...SR16, but I have a set of systema super torque up gears comming, systema reinforced piston, systema steel bushing, and systema piston head...All these were spares a friend of mine has, so Im not picking and choosing.

I don't wanna blow my mechbox, so whats the most powerful spring I install and stay safe...while getting as many FPS as possible....

bruce · February 12th, 2005, 20:19

Quote:

Originally Posted by Droc

I don't wanna blow my mechbox, so whats the most powerful spring I install and stay safe...while getting as many FPS as possible....

If you want to play with the guys at the LZ and PQAC, you'll have to limit your fps to 400. Use a PDI 150% max. I'm using it with a TN barrel and it'll be very close to 400fps or slightly over.

Trader rating · February 12th, 2005, 20:48

my only concern is that my finds wont allow for a reinforced mechbox for awhile yet....so keeping FPS high, without blowing the mechbox

bruce · February 12th, 2005, 22:06

That's the gamble we all take when it comes to the Version2 mechboxes my friend. Especially if we play in the winter with an upgraded spring. A M120S will for sure crack your mechbox in the winter. I've crack a Progear and a Systema one already.

I'll go with a Top Power 150%, PDI 140% or a M100 spring to be safer. I hear Top Power springs are better for the mechboxes but I gave mine to Vondnik before I could use it.

vondnik · February 13th, 2005, 01:55

Quote:

Originally Posted by bruce

I hear Top Power springs are better for the mechboxes but I gave mine to Vondnik before I could use it.

ANd he loves it over any other spring he ever installed in any guns... Now the only catch is finding more of them damn it...

ILLusion · March 16th, 2005, 23:21

Quote:

Originally Posted by vondnik

ANd he loves it over any other spring he ever installed in any guns... Now the only catch is finding more of them damn it...

You might want to consider KM/Head 1950 springs... they're short and "feel soft" like Top Power springs as well. They don't hold their initial velocity too well, but once settled in, they're damn consistent. In my tests, they were more consistent than Top Power springs.

That's why I have a couple of them on the way...

CDN_Stalker · March 17th, 2005, 09:30

The PDI 150% in my MP5 shoots roughly around 340fps. I know, I chronied a number of shots. Doubt a tightbore would knock the fps that much (as said above). And Apoc has a PDI 170% spring in his SR-16, and it's only sitting around 360-370fps. Will be up a bit more soon, as I'm installing a bearing spring guide this weekend.

I'll vouch on the length difference between the PDI 150 and 170 springs. Couldn't figure out why the 170 was shorter. I'll just say that the 170 is easier to compress and hold to get the mechbox back together.

ILLusion · March 31st, 2005, 17:03

That's incredibly low... 340fps with a PDI 150% and 360-370fps with a 170%??

Can I ask what chronograph you are using? And is it optical or radar? Optical chronies are much more accurate and radar's usually have difficulty picking up BBs or give results that are too low or too high.

The length differences between the PDI 150 and 170 can be attributed to different materials used. A softer steel is used for the 150, but a greater length must be attributed to get it to perform where PDI wants it to perform. That material is used because there is no ecconomical grade of steel between what's used in the 150 and the 170.

Prowler · April 3rd, 2005, 18:44

With my MP5 I used an M120 spring and was shooting around 440-450fps with some shots as low as 403. My mp5 is since retired and am looking at getting a good spring for 390 fps.

scott_ · April 3rd, 2005, 18:47

PDI 150 should do you well.

mashymre · August 16th, 2005, 13:37

my g3 with pdi 140% spring installed shoots at about 385fps

ILLusion · August 16th, 2005, 17:28

What's your spring guide, piston head and inner barrel?

mashymre · August 20th, 2005, 04:01

origional piston head with 4 small holes. origional barrel
hurricane bearing spring guide

ILLusion · August 22nd, 2005, 04:34

the nut on the original piston head compresses the spring more - putting more preload on it, and giving it a higher output. Its height is almost double that of the bearings on the piston head I used for testing the springs in my spring chart.

As well, the chart is not here to tell you exactly what velocity you will get exactly with what springs. It's there so that you can compare springs against other springs as well as to give you a *general* idea of what velocity to expect with a particular spring.

The Airsoft manufacturing process is not consistent enough to allow another P90 upgraded with the exact same parts I used to output exactly the same velocity. The chances of that happening are pretty slim, given all the variables.

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August 27th, 2004, 16:13	#31
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	I'm considering getting my hands on a brand new PDI 170% just so I can test it out on my platform... the last time I worked with one, it was putting out close to 430fps. Although I don't want to buy one just to test since I know I'll have a hell of a time trying to sell it. The materials between the 170% and 150% must be different, hence the different lengths. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

February 12th, 2005, 22:06	#35
bruce Super Moderator Trader rating Join Date: Aug 2003 Location: Montreal	That's the gamble we all take when it comes to the Version2 mechboxes my friend. Especially if we play in the winter with an upgraded spring. A M120S will for sure crack your mechbox in the winter. I've crack a Progear and a Systema one already. I'll go with a Top Power 150%, PDI 140% or a M100 spring to be safer. I hear Top Power springs are better for the mechboxes but I gave mine to Vondnik before I could use it. __________________ bruce: Team Bad Karma-(BK-05) : Special Battalion East-(SBE-01)

March 17th, 2005, 09:30	#38
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	The PDI 150% in my MP5 shoots roughly around 340fps. I know, I chronied a number of shots. Doubt a tightbore would knock the fps that much (as said above). And Apoc has a PDI 170% spring in his SR-16, and it's only sitting around 360-370fps. Will be up a bit more soon, as I'm installing a bearing spring guide this weekend. I'll vouch on the length difference between the PDI 150 and 170 springs. Couldn't figure out why the 170 was shorter. I'll just say that the 170 is easier to compress and hold to get the mechbox back together. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

February 12th, 2005, 19:45	#32
Droc Guest Trader rating	Ok, so im getting confused with all this. Im stock right now...SR16, but I have a set of systema super torque up gears comming, systema reinforced piston, systema steel bushing, and systema piston head...All these were spares a friend of mine has, so Im not picking and choosing. I don't wanna blow my mechbox, so whats the most powerful spring I install and stay safe...while getting as many FPS as possible....

February 12th, 2005, 20:48	#34
Droc Guest Trader rating	my only concern is that my finds wont allow for a reinforced mechbox for awhile yet....so keeping FPS high, without blowing the mechbox

March 31st, 2005, 17:03	#39
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	That's incredibly low... 340fps with a PDI 150% and 360-370fps with a 170%?? Can I ask what chronograph you are using? And is it optical or radar? Optical chronies are much more accurate and radar's usually have difficulty picking up BBs or give results that are too low or too high. The length differences between the PDI 150 and 170 can be attributed to different materials used. A softer steel is used for the 150, but a greater length must be attributed to get it to perform where PDI wants it to perform. That material is used because there is no ecconomical grade of steel between what's used in the 150 and the 170. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

April 3rd, 2005, 18:44	#40
Prowler Trader rating Join Date: Feb 2004 Location: Surrey, BC	With my MP5 I used an M120 spring and was shooting around 440-450fps with some shots as low as 403. My mp5 is since retired and am looking at getting a good spring for 390 fps. __________________

April 3rd, 2005, 18:47	#41
scott_ Banned Trader rating Join Date: Dec 2004 Location: Mississauga	PDI 150 should do you well.

August 16th, 2005, 13:37	#42
mashymre Trader rating Join Date: Mar 2005	my g3 with pdi 140% spring installed shoots at about 385fps

August 16th, 2005, 17:28	#43
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	What's your spring guide, piston head and inner barrel? __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

August 20th, 2005, 04:01	#44
mashymre Trader rating Join Date: Mar 2005	origional piston head with 4 small holes. origional barrel hurricane bearing spring guide

August 22nd, 2005, 04:34	#45
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	the nut on the original piston head compresses the spring more - putting more preload on it, and giving it a higher output. Its height is almost double that of the bearings on the piston head I used for testing the springs in my spring chart. As well, the chart is not here to tell you exactly what velocity you will get exactly with what springs. It's there so that you can compare springs against other springs as well as to give you a general idea of what velocity to expect with a particular spring. The Airsoft manufacturing process is not consistent enough to allow another P90 upgraded with the exact same parts I used to output exactly the same velocity. The chances of that happening are pretty slim, given all the variables. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

Spring Comparison Chart - Updated April 1st, 2006

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