Need input on Poseidon Xtreme Deep

[thethumper]

jdlo once bubbled...
My LDS had an Xstream on display some time ago. I really liked
the second stage but not the 1st stage due to the limited number
of LP ports. So I'd like to combine an Xstream 2nd with a
Jetstream 1st (which I own). The only doubt I have is about
the IPs: the Xstream is rated in the brochure at 123, while
the Jetstream runs at 145. What would be recommended:
lower the IP to 123 (including my Jetstream octo) or run the
Xstream at 145? Or is there no big difference and both are
fine?

Thanks!

If you run the IP to 145 psi for the Odin, you're gonna run into a free flow problem w/the Xtreme. Better to run the IP @ 123psi to suit the Xtreme. From the fatory I have bought Odins set @ 125 psi & they breathed well. But not as well as @ 145psi.

If you're not diving a dry suit, you can get the Xtreme 90. It has 3/LP & 1/HP port. That's all you need for 2 2nd stages, a power inflator & pressure gage.

 

[squidguy]

I've seen a Poseidon "T" at my dealer so that you can run your BC inflator and drysuit inflator off one port.... so get the 90 degree Ist stage and "T" for single cylinder with dry suit diving

 

[jdlo]

thethumper once bubbled...


If you run the IP to 145 psi for the Odin, you're gonna run into a free flow problem w/the Xtreme. Better to run the IP @ 123psi to suit the Xtreme. From the fatory I have bought Odins set @ 125 psi & they breathed well. But not as well as @ 145psi.

If you're not diving a dry suit, you can get the Xtreme 90. It has 3/LP & 1/HP port. That's all you need for 2 2nd stages, a power inflator & pressure gage.

For a classic downstream 2nd, I can understand the free
flow problem. The valve is kept shut by a spring, so if you
increase the ip, the valve has a bigger force on it, making
it more likely to open.
But in case of the Jetstream/Xstream, it is an upstream valve.
Would an increased IP just not make it harder to breath since
more force is needed by the diaphram to open the valve?

 

[thethumper]

jdlo once bubbled...


For a classic downstream 2nd, I can understand the free
flow problem. The valve is kept shut by a spring, so if you
increase the ip, the valve has a bigger force on it, making
it more likely to open.
But in case of the Jetstream/Xstream, it is an upstream valve.
Would an increased IP just not make it harder to breath since
more force is needed by the diaphram to open the valve?

I am not a reg tech. However, When I got my Odins from Divers Supply, they were set @ 125psi IP. They were a little tuff to breathe. I had them adjusted by the tech @ Cave Excursions to the correct IP 145psi & now they breathe like a Poseidon should. I have no free flow problems. I see where you're going, but remember Odins' have a servo needle 2nd stage. There is a micro adj. for cracking pressure.