The Stuntman, on Sep 17 2007, 01:03 AM, said:
I ve got a standard Ion with an QEV & its acting wierd...
Yesterday I was getting wild velocity spikes & drops while trying to chrono in for a game. Limit was 285, & I was getting anywhere from 260 to 310. So to keep it safely ubder 285 I had to crank it down to the 230-275 range. Annoying.
I hanvt done anything unusual to the gun lately, and last game it was solid. Is this a regulator problem, or should I be looking for a loose connection somewhere?
Any input would be appriciated.
You need to identify if you are using HPA or CO2 and what tank reg (on an HPA)
...and the brand of QEV. Trust me, there's a big difference between them and our responses will depend on your answer.
IF you mean to say standard as "Stock," I'll try to respond in that reference...
If HPA - The air source will not cause a spike. Likely, it's something in the in-line regulator. Either you need to tear it down and perform maintenence on the internals (Clean and grease with dow33)...or if you've done that already, the reg may need a rebuild or replacement (depending on how much you've put through it).
If Co2 - Co2 is notorious for spiking. If you are using it (even if antisiphonned like it should be), replace it with HPA.
The QEV could be clogged with grease or just not a good QEV in general. Clippards (regardless of name...virtue, trinity, et al) are best, followed by Eclipse.
ANS and SP360's are the 'worst' because they are more restrictive than the previously named. If you are using a 'substandard' QEV, your dwell/recharge rate needs to be increased. Yes, this will slow down your rate of fire but were talking fractions of milliseconds...not hours. Increase your dwell/recharge time by a few blinks at a time until you get a consistancy of less than 8 fps over the chrono.
Now...if your Ion is stock, with the exception for the QEV, your operating pressure should be set at about 160/170 psi and dwell around 30-35 ms...possibly as high as 42 ms. It's true that your velocity is set with the input PSI and this number WILL change...but that should give you a good starting point to work from. From there, you raise or lower your dwell/recharge rate to accomodate consistancy.
Basicly it's this...dwell/recharge time governs chrono consistancy. Unless you have a seriously upgraded marker (new, lighter and higher flowing bolt to start with), you really can't lower dwell time too much (even WITH a good QEV).