Why set a max pressure with Apap?

Because of advice I received here, especially from palerider, I switched my Airsense from the "for her" mode to regular apap so that the pressure can go as high as it needs to. I had the max pressure set at 16 and I see that last night 16 was not high enough; I had a run of OAs and the machine needed to go higher. So I'm going to set it higher, of course, but I was wondering, then, why have a cap on the max pressure at all? Why not leave that at 20 and just pay attention to the min pressure?

I cap mine low to minimize aerophagia. Its a tradeoff.

SleepyBobR wrote:I cap mine low to minimize aerophagia. Its a tradeoff.

Oh, ok. I've never had a problem with that.

There may be other reasons as well to limit the pressure.

Why would you need a pressure higher than you need, that doesn't make ! Once you find the best pressure you need, set 2 under and 2 over the best pressure. Jim

AMK wrote:why have a cap on the max pressure at all? Why not leave that at 20 and just pay attention to the min pressure?

Normally, there's no reason, which is why I always tell people to just set the max to 20 (or 25 on a bilevel), in rare cases, there may be issues, like flow limitations that just won't clear, or as sleepybobr mentioned, aerophagia. In those cases, then limiting the max may be of value. usually though, it just gets in the way, or is irrelevant.

palerider wrote:Normally, there's no reason, which is why I always tell people to just set the max to 20 (or 25 on a bilevel), in rare cases, there may be issues, like flow limitations that just won't clear, or as sleepybobr mentioned, aerophagia. In those cases, then limiting the max may be of value. usually though, it just gets in the way, or is irrelevant.

OK thanks. I'll set it to 20. Most nights on regular apap are going pretty well, I think, actually better than the "for her" because other than last night my OAs seem to be random and spread out now, rather than in one big clump.

My truck will run over 120 MPG, but usually don't find the need to drive more than 20 MPH over the speed limit in town, same with my APAP. Jim

Goofproof wrote:My truck will run over 120 MPG, but usually don't find the need to drive more than 20 MPH over the speed limit in town, same with my APAP. Jim

At 120 MPG you could sell that sucker for a bit of a profit.

TASmart wrote:

Goofproof wrote:My truck will run over 120 MPG, but usually don't find the need to drive more than 20 MPH over the speed limit in town, same with my APAP. Jim

At 120 MPG you could sell that sucker for a bit of a profit.

2009 GMC Sierra Crew Cab, 5.3 L Flex Fuel, 6 speed auto, locking rear end, 12,000 miles. Probable couldn't get 1/2 of what I paid, they had one, I wanted one... Obama wouldn't give me a deal for getting rid of my three old cars, so I voted for a bigger engine. Keep them oil pumps pumping. When I kick off, it goes to my son. Jim

Goofproof wrote:

TASmart wrote:

Goofproof wrote:My truck will run over 120 MPG, but usually don't find the need to drive more than 20 MPH over the speed limit in town, same with my APAP. Jim

At 120 MPG you could sell that sucker for a bit of a profit.

2009 GMC Sierra Crew Cab, 5.3 L Flex Fuel, 6 speed auto, locking rear end, 12,000 miles. Probable couldn't get 1/2 of what I paid, they had one, I wanted one... Obama wouldn't give me a deal for getting rid of my three old cars, so I voted for a bigger engine. Keep them oil pumps pumping. When I kick off, it goes to my son. Jim

How about some mileage and fuel use logs to prove that kind of fuel economy?

TASmart wrote:

Goofproof wrote:

TASmart wrote:

Goofproof wrote:My truck will run over 120 MPG, but usually don't find the need to drive more than 20 MPH over the speed limit in town, same with my APAP. Jim

At 120 MPG you could sell that sucker for a bit of a profit.

2009 GMC Sierra Crew Cab, 5.3 L Flex Fuel, 6 speed auto, locking rear end, 12,000 miles. Probable couldn't get 1/2 of what I paid, they had one, I wanted one... Obama wouldn't give me a deal for getting rid of my three old cars, so I voted for a bigger engine. Keep them oil pumps pumping. When I kick off, it goes to my son. Jim

How about some mileage and fuel use logs to prove that kind of fuel economy?

10 to 12 MPG in town, but I run the A/C all the time and never get out of the truck while the wife shops and does what is needed, I'm just the driver. It's not been at on a trip out of town in two years, gets 15 to 17 on the highway. All my cars used to get 10 MPG in town, lead foot. Jim

I was a Ford Mechanic for 11 years, but this GMC is great, too bad when I was really driving , I didn't have anything this good. I always had old cars and trucks, but 57 years of driving never had to call a tow truck. Brought them all home alive, that includes my 2 1/2 ton truck in Nam, put 32,000 miles on it in 12 months.

You still miss it. You said 120 MPG when you meant 120 MPH

TASmart wrote:You still miss it. You said 120 MPG when you meant 120 MPH

ah, yes, old eyes!

When I had the top end maxed out, the pressure would go berserk several times a night.
Each time, I woke up, most unpleasantly.
Setting the max to a bit above my 95% gives ME the best results--(lets me SLEEP.)
After all, that's what I'm there for.
I do not recommend others use my settings--find your own, and embrace your own inner Goldilocks.