No Shoot Up???????

[Cunha]

I remember reading that if you run lower input pressures to your X valve - 600-700, you can get close to eliminating the reactive trigger and also that the valve will behave much like a classic valve.

Does anyone know if running 600 or so input will actually make the X valve chrono normally?

I cant stand shoot up, and use a classic valve instead in order to avoid it, but I am curious if this is a solution to shootup..with the drawback that the RT will be weakened.

Anyone know how it would change the ULT? Maybe the ULT would need to be tuned differently..or it wouldnt work right at all like in a classic?

Hopefully some knowledgeable dudes are cruising around. Thanks a lot.

please do not post here telling me that the shootup isnt that bad.. I know what I like and hate.

Thanks guys

[questionful]

Shoot-up is very much affected by your input pressure. Check out these graphs:

TECHNICAL DATA FOR EXPERIENCED AIRSMITHS

The velocity fluctuations in the RT are caused by the temperature changes of the compressed gas in the air chamber. Temperature-related pressure profiles will have different characteristics depending upon input pressure. The graphs below show how chamber pressure changes over time.
This page contains more technical data to help you understand what is going on inside the RT and to help you make the RT perform to your style of play.



Notice that the high input pressure graph peaks high, goes into a dip, and then levels off. When the gas cools, regulator opens up and maintains a steady pressure. After 0.5 seconds the pressure has stabilized.

When firing at a rate of 2 shots per second or slower, the RT will maintain consistent velocities.
When shooting at a rate of 3 shots per second or faster, the velocity will be closer to your maximum rapid fire velocity, as set with the quick shot test. Higher input pressure also gives a stronger Reactive Trigger. When chronographing at high input pressures, a rapid fire shot (as described earlier) will be higher than a shot fired after a ten second wait.



In the medium input pressure graph you will notice a peak followed by a dip and then a gradual climb back to your rapid fire pressure. The peak is where the temperature of the gas is at its highest.
This is where your rapid fire pressures (velocities) will be seen. When shooting at your maximum rate, you will be shooting the same velocity as when you wait 10 seconds, or more, and take another shot.
If you are shooting at a rate lower than your maximum, you will notice lower velocities. This is where the graph is falling to its lowest point (labeled "dip" on the graph). Here the gas is cooling, and the regulator has not opened back up. After this point, the regulator opens back up and the chamber pressure begins to climb back to your rapid fire pressure. This input pressure range is for the player who combines rapid firing with an occasional sniper shot. This will also give a positive Reactive Trigger feel. When chronographing at medium input pressures, a rapid fire shot (as described earlier) and a shot after a ten second wait will be similar.



On the low input pressure graph, notice that the peak and dip pressures in the first second are lower than the pressures after 1 second. This means that all shots spaced less than 1 second apart will be at lower velocity than shots spaced longer than 1 second apart. At lower input pressures, all benefits of the fast recharge regulator diminish and the regulator acts like the regulator on a 68AUTOMAG. The main advantage is that this setup is more consistent over the chronograph where shots are at least one second apart and may benefit a "sniper" player concerned with consistent slow shots. Lower input pressure also weakens the Reactive Trigger. When chronographing at low input pressures, a rapid fire shot (as described earlier) will be lower than a shot fired after a ten second wait.

Source: http://www.airgundesignsusa.com/rtchrono.shtml

Oh and the ULT doesn't affect it AFAIK. I've never heard of the on/off affecting recharge rates.

[Cunha]

So maybe I can use the X valve. Hmm. Thanks.

[questionful]

You definitely can. Just adjust the input pressure to the kind of shooting you do.

Or you could Pneu a classic valve if you just want an RT valve for the ROF.

[Little_Ho]

you could start out turn the input pressure down till it quit shooting well recharging the go from there. I usual use around 800-900 PSI input and well the higher i go the easier is it to walk my Mag because of the Reactivity but i will never sweet Spot....lol

Set it up that way

[athomas]

If you are running a level 10 bolt, you will want around 700 psi to maintain a decent recharge rate. 700psi will keep the reactivity down and help keep the shoot-up to a minimum.