Respotting a regulator for a change of Elevation?

[jokers]

I know that this may have been discussed already and that it might be hashed out so if that it the case please feel free to point me to the location for the discussion.
If you sweet spot at a different location then you play at, in order to get the best performance out of the marker should you sweet spot at the play location?
Example: I sweet spot a cocker in Middleton ID elevation 2,398 ft with a typical dry climate and travel to St. Paul OR elevation 171 ft with a higher humidity and more rain. Should I sweet spot when i get to the playing field? In this situation I know that I will have to change the velocity simply because I have changed elevation but since the pressures are about 1psia different i do not think it would make a difference to the regulator, but I may be wrong.

[Grendel]

Change in elevation really has no practical impact on sweet spotting a regulator. When sweet spotting you are adjusting the regulator for the mechanical tolerance stack ups involved in your particular marker/regulator combination. Since you are using a closed source of air that is independent from atmosphere any change in atmospheric pressure will have essentially no impact on the setting.

[jokers]

Grendel Thank you that was what I was thinking and how I have treated it for a while. You know what they say though if you do not ask you will not know for sure.

[DocsMachine]

Since you are using a closed source of air that is independent from atmosphere any change in atmospheric pressure will have essentially no impact on the setting.

-Not technically completely true.

Inline regulators typically have the adjuster side open to the atmosphere, and of course a regulator works by balancing internal air pressure vs. adjuster-spring pressure on either side of a movable piston. The difference in external air pressure, therefore, adds to the difference in adjuster spring pressure.

That said, a one or two PSI difference usually makes... very little difference.

Doc.

[Grendel]

why I used the word "essentially"

[woouulf]

Umm, I managed a field a few years back (9 years ago) that was up in the mountains and its seemed that 90% of the markers that came from as wel called it "down the hill" were shooting hot..I could crono a Marker at home here in the Desert at 285 and once at the field it was 300_ 310 fps...I dont know the science , but it happened.. Also when transporting CO2 tanks, I would blow Burst Disks like crazy...Also when Vapeing first came around, I would blow o-rings that sealed the tanks and cause a big mess.. The reason I got out of Automags was I could set up 3 or 4 the night before playing at home and when I got up the mountain 2 or 3 would be screwed up once aired up...I didn't have a problem with Tippmanns, I just had to re crono or set them up with a lower FPS at home...Argue all you want, but it happened..

[jokers]

I understand velocity changes and that I have to account for that. The reason for that in my not scientific opinion is the density of the air,. The sweet spot to me was something that I could see changing in theory but I could also see it not changing.