I normally pump my ozone kites to about 6.5PSI this is the end of the green on the pump gauge. Other people tell me they pump to up to 9PSI about max standard pump will go, resulting in a stiffer frame and better flying kite.
What brands and pressures do other people inflate to?
I'll tend to use the squeeze test rather than a pressure gauge as it gives a more consistent hoop stress between sizes. But in general its probably about 7-8psi on the gauge depending on the time of year and size of kite (Duotone Rebels).
Other non gauge related methods like the fold test and ping test are also available.
Your question should probably be - what effect does inflation pressure have on my kite and why might I want it higher or lower?
I pump until the back pressure won't allow any more... as hard as I can get it. I just got a new high volume pump which makes it easier. I have a Ozone Amp and Naish Dash. A couple of seasons ago I had a Ozone Enduro and if that wasn't rock hard it would distort especially under heavy load. Infact I discovered the leading edge on that kite had a slow leak due to the fact it would fly terribly (especially looping) when the pressure reduced a bit, usually halfway into a session. Once I replaced the bladder and it kept the initial rock hard pressure it flew sweet.
Pumps are improving.. Check the un-boxing video - hand pumping to 15-18 psi
www.seabreeze.com.au/forums/Stand-Up-Paddle/Foiling/Gong-HIPE-5-3--review
Most anytime you are low on inflation and kite hits the water the shape will sag - making it harder to relaunch and slower especially in lower wind strength. In the air - well if the air-frame is not as rigid the sail will have a marginally higher drag profile and will distort the shape more on the turning side. It will not turn as crisply and you can loose precision - mostly unless really obviously floppy a non-issue until you start doing tricks. I used to own a Rebel which when slightly over inflated ( I assume - hard to tell until..) it sometimes inverted (+ fully de-powered the 5th line involved here too - it never returned to normal shape). It would still fly "A about T" and get U back to shore... flew well the rest of the time.
WeeBBy is on the money - chuck the gauge and try. If the pump is getting a bit of a struggle to use - suck in (by pumping) silicon spray into deflate opening and give a few extra pumps to remove any residue before using on kite.. (I do not know if this is bad for any of the components has not been for me to-date).
Cheers
AP
A re-think is to buy a Peak4 kite (no inflation required) - but be warned they are addictive, not designed for water use, flap, require 3+ sqm down-sizing and can sink but are still addictive.
Smaller kites need more pressure. I have a 2.5m kite and is practically impossible to get it inflated hard.
I think the real question is whether overinflation shortens lifespan of the kite?
These from a Cab large pump look too low for me, I'd add another 1-2psi
i go to 10ish bar but i am using the reedin kites which can tolerate high pressure (<11ish bar) like the new naish.
its frightening to see how many people are flying underinflated kites....if its not pumped up enough the frame wont be rigid enough. you may not notice when your mwing the lawn but as soon as you get agressive you can feel the delays in the bar response
As per peahi s response been kitei ng for years and never realised smaller kites need more pressure. I've always pumped all sizes similar.
I would have thought the bigger ones may need a bit more as being larger more likely to bend flex.
I think he's on the money with the cabrinha chart but with the plus 1 or 2 psi. My 14 enduro would be slightly soft and flexible at 5 to 6 psi, but 7 to 8 rock solid canopy.
Bigger kites need more strokes of the pump 
- but that doesn't translate to more pressure because the diameter of the leading edge is wider (for various reasons like stopping it overshooting the edge of the wind window etc). The upshot is that you need less pressure to get the same resistance to deformation. The reverse is true. Small kites - thin leading edge - more pressure needed to make a rigid structure
* The innuendo is strong in this explanation isn't it 
Select to expand quotedkeating said..
I normally pump my ozone kites to about 6.5PSI this is the end of the green on the pump gauge. Other people tell me they pump to up to 9PSI about max standard pump will go, resulting in a stiffer frame and better flying kite.
What brands and pressures do other people inflate to?
I've always pumped my Ozone kites to the end of the green on the pump for my 6/8/10/12 Reos and to about halfway into the green on the 14 Enduro and Zephyr.
Too much pressure will damage all inflatable kites, refer to instructions for each brand, but in general around 7-8PSI should be the max unless the brand specifies more.
High pressure does not always equal better performance, and the downside is damage.
I've always aimed for about 8 although I'd suggest erring on the side of more is better. My pump broke and I threw together some bits from old pumps and ended up with maybe six in my kite and now I've got a compressed nerve because the kite just doesn't behave how it should when underinflated.
I remember some years ago reading from several manufacturers agreeing that it is near impossible to damage a kite with a hand pump. My gauge is my weight (75kg), i.e. when there is no more air going in with my full weight on the pump. Generally, you don't want to hang on to a 12m jelly fish kind of kite, so the more rigid the better response.
Imagine you have a big beetle on your knee cap. Using the thumb and index finger flick technique you flick the beetle off your knee with as much gusto as practical.
That is what I do to the leading edge. When the beetle flick sound goes from "thud" to "twang" I am good to go.
Select to expand quotedkeating said..
I normally pump my ozone kites to about 6.5PSI this is the end of the green on the pump gauge. Other people tell me they pump to up to 9PSI about max standard pump will go, resulting in a stiffer frame and better flying kite.
What brands and pressures do other people inflate to?
Dale, pump it til the LE barely bends when you try and fold it a couple of feet from the tip, no matter what size or brand kite, never used a gauge in 14 yrs. You've seen how my edges perform but I pump up all my kites the same, edge, enduro, reo.
Select to expand quoteglasstraxx said..
i go to 10ish bar but i am using the reedin kites which can tolerate high pressure (
its frightening to see how many people are flying underinflated kites....if its not pumped up enough the frame wont be rigid enough. you may not notice when your mwing the lawn but as soon as you get agressive you can feel the delays in the bar response
10bar being 145psi 
Select to expand quoteMark _australia said..glasstraxx said..
i go to 10ish bar but i am using the reedin kites which can tolerate high pressure (
its frightening to see how many people are flying underinflated kites....if its not pumped up enough the frame wont be rigid enough. you may not notice when your mwing the lawn but as soon as you get agressive you can feel the delays in the bar response
10bar being 145psi
Yep - somebody is missing a decimal place!! I want to see a kite that can be inflated to 10 bar!!
I hear kite claims being rejected because obvious signs of excessive kite inflation - read your kites manual !!
I use pump endorsed by the manufacturer of my kite - it has their brand on the pump so I assume if I stay in the green zone of the pump gauge they have to honor their warranty !! ??
Select to expand quoteMark _australia said..glasstraxx said..
i go to 10ish bar but i am using the reedin kites which can tolerate high pressure (
its frightening to see how many people are flying underinflated kites....if its not pumped up enough the frame wont be rigid enough. you may not notice when your mwing the lawn but as soon as you get agressive you can feel the delays in the bar response
10bar being 145psi
haha psi ... easy does it.
was waiting for this thanks Mark.
With 10bar if you could design for it the kite would literally become a lethal wing exploding on impact.
9 Psi is the best all round after years of Kiting on different sizes especially OZone.
