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Old 04-28-2011, 02:46 AM   #1 (permalink)
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Going Low Pressure on a Sterling

When i spring for the nice paint like ultra evil, my sterling tends to be a little harsh on it. I often break a ball every 30 or so shots and it's frustrating. So i'm considering trying to lower the pressure on it. (Currently running unregged with a tank that outputs about 800 to 850 psi)

BUT! I have no experience in messing with the springing of the valve/hammer, so i'd appreciate some advice.

To begin with, do they have any sterling-specific spring kits? Or will i have to buy one for a cocker?

Second of all, are there any aftermarket bolts out there for sterlings?
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Old 04-28-2011, 05:03 AM   #2 (permalink)
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If you figure it out let me know. I was breaking ultra evil at 550 PSI and figured it might be the wire detent or clipping them while loading under AT. It was breaking in T2s as well at the time so I think it's just not a pump friendly paint.

I've seen Sterling spring kits but I don't know if they're being produced anymore. You should be able to take a spyder spring kit and cut the springs down to size.

Arrow Precision has a venturi bolt on their website. Any aftermarket bolts I know of are old.
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Old 04-28-2011, 12:24 PM   #3 (permalink)
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This is the only picture of a spring comparison I have uploaded right now. Short one is the stock main from my Sterling & the others are a few mains from my old Spyder spring set.



Bolts, I think Arrow Precision has something out. I remember something on their site but no real details.

As far as tuning, I have read using a hard valve & lighter main will work. Look at the fellas on here running regulated 12gram Snipers. Im pretty sure this is how I will end up tuning mine. Another option is tune it like an old Spyder, lightest valve spring possible & spring the main to get up to FPS. The problem with that is you will use a lot more gas & its set up for a blowback marker, not a pump.
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Old 04-30-2011, 12:32 AM   #4 (permalink)
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My sterling hated brittle paint. Anything higher-end than Premium and it broken nearly every ball. I eventually bought a Stabilizer because I was so frustrated. It worked really well after that, even with Marbs.
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Old 04-30-2011, 04:47 AM   #5 (permalink)
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My sterling hated brittle paint. Anything higher-end than Premium and it broken nearly every ball. I eventually bought a Stabilizer because I was so frustrated. It worked really well after that, even with Marbs.
Did you change your spring set up at all?
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Old 05-01-2011, 06:40 PM   #6 (permalink)
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Chubs, interesting...I don't use any regulator and have no problem with brittle paint.

Mine's an STP.
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Old 05-02-2011, 08:42 PM   #7 (permalink)
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I run mine with a stabilizer now, but when I didn't using marbs was no problem (newer stockclass stp)

Also, how do you sweet-spot a sterling? Is it like a cocker based pump? (turn the reg up till your velocity stops going up, then adjust velocity with ivg?)
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Old 05-02-2011, 11:22 PM   #8 (permalink)
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Quote:
Originally Posted by Hamer101 View Post
I run mine with a stabilizer now, but when I didn't using marbs was no problem (newer stockclass stp)

Also, how do you sweet-spot a sterling? Is it like a cocker based pump? (turn the reg up till your velocity stops going up, then adjust velocity with ivg?)
My best guess is like a 'Cocker. The design is the same, just the lower tube is just flipped around.
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Old 05-04-2011, 02:57 PM   #9 (permalink)
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My best guess is like a 'Cocker. The design is the same, just the lower tube is just flipped around.
My thoughts were the same. I'll give it a try within a few weeks and see what kind of results I get as far as efficiency and gentleness on paint. Also will be interesting to see where the sweep-spot running pressure is.
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Old 05-04-2011, 06:25 PM   #10 (permalink)
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I did 5 more unregged tests yesterday & got pissed so I slapped my female Palmer on there. Then found out both my Co2 tank & HPA tank are empty plus the 2 20lbs out in the shop are bone dry. I must have had a brain fart cause I tried to sweetspot with 12grams.
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