Puma 12V Compressor

[LandCruiserPhil]

We recommend #4 if your Puma is located in the back. My Puma is 12" from my second battery and I use #4. Compressor starts at ~30amps and shuts off at ~50amps

Pictured with our tire carrier



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Pictured with our tire carrier

 

[80t0ylc]

We recommend #4 if your Puma is located in the back. My Puma is 12" from my second battery and I use #4. Compressor starts at ~30amps and shuts off at ~50amps

Phil, I'm sure you meant to say 12 feet - not inches - right? Also, what is the significance of your current readings? Thanks!
Edit: Never mind about the current question - I just found my answer in one of your previous posts.

 

[LandCruiserPhil]

Phil, I'm sure you meant to say 12 feet - not inches - right? Also, what is the significance of your current readings? Thanks!

12" (inches) = lowest voltage drop

Significance of amp draw is for cable sizing for others.

My airing up is a science as in I use a stop watch. Air up on 4 - 35's is under 10min stopping to leaving 14 -35psi

2nd battery is under Puma Anderson plug in sight

 

[rockstate45]

12" (inches) = lowest voltage drop

Significance of amp draw is for cable sizing for others.

My airing up is a science as in I use a stop watch. Air up on 4 - 35's is under 10min stopping to leaving 14 -35psi

35 psi! Amazing to see the variance across the board with folks. One of my buddies is using the Treadwright 35s and keeps about 40 psi in his tires with even treadwear. My KM2s like about 30 all around for my rig and the weight I carry. Much more than that and they'll wear the inside treads.

 

[LandCruiserPhil]

35 psi! Amazing to see the variance across the board with folks. One of my buddies is using the Treadwright 35s and keeps about 40 psi in his tires with even treadwear. My KM2s like about 30 all around for my rig and the weight I carry. Much more than that and they'll wear the inside treads.

Correct PSI verses weight is the factor. Im at 7050lbs travel weight. I do agree most run too much air. See the attached for more than you wanted to know about proper air pressure given tire size and vehicle weight.

 

[80t0ylc]

12" (inches) = lowest voltage drop

Significance of amp draw is for cable sizing for others.

My airing up is a science as in I use a stop watch. Air up on 4 - 35's is under 10min stopping to leaving 14 -35psi

Ok, thanks! But, as long as one's voltage drop result, after calculating wire size, distance and other variables keeps the voltage above 12V, how does that translate to faster air up times? BTW, very nice rack in the back of your 80!!

 

[rockstate45]

Correct PSI verses weight is the factor. Im at 7050lbs travel weight. I do agree most run too much air. See the attached for more than you wanted to know about proper air pressure given tire size and vehicle weight.

Interesting! Learned something new today:

Some light truck tires may contain two load indices on the sidewall as part of the service description (i.e. LT 235/85R16 120/116S). The first load index applies to single tire fitments and the second load index refers to tires in dual. When LT tires are fitted in dual assemblies, the load capacity is reduced by 9% of the single load capacity to account for the affect of road crown.

 

[LandCruiserPhil]

Ok, thanks! But, as long as one's voltage drop result, after calculating wire size, distance and other variables keeps the voltage above 12V, how does that translate to faster air up times? BTW, very nice rack in the back of your 80!!

Higher voltage = faster motor = faster air up time. With my set up my starting voltage at the compressor is ~13.8V

 

[rockstate45]

Correct PSI verses weight is the factor. Im at 7050lbs travel weight. I do agree most run too much air. See the attached for more than you wanted to know about proper air pressure given tire size and vehicle weight.

So, this has gotten me thinking about travel weight, the GAWR, GVWR, etc. Looking at an old weigh ticket of mine, I came in at 6,020 with a tank of gas (3240/2780 Front/rear). With you being over the GVWR of 6405, what type of concerns do you have running at the weight you do? Any liability concerns if you get into an accident?

I think this is something that plagues 99% of 80s on this forum but not sure it's been discussed before.

 

[LandCruiserPhil]

All I can say is stay out of my way!!! Seriously I have no concern at all as I have much bigger things to worry about. Think about this 99% of the JK on the road are over weight. As you know in the USA you can be sued or ACCUSED of anything you have ever done in your entire life.

Not many people would look at my 80 and think overweight.

 

[cody c]

I've had a Pacbrake for a few years, which I believe is the same as the Puma, mounted underhood and used for a couple minutes everytime I drive the truck (airbags instead of coil springs) and it's been a champ seeing as how much use its seen.

I would recommend it to anyone else without hesitation.

The Viair I had previous to it was good while it lasted.... But not that good as it didn't last, and replacement parts were overpriced, it was cheaper to buy a new one. Wouldn't buy another viair or reccomend, but they do look cool.

 

[Stuparman]

Higher voltage = faster motor = faster air up time. With my set up my starting voltage at the compressor is ~13.8V

I wonder if this is why I'm undewhelmed with my puma. I'll have to test my voltage drop.

 

[LandCruiserPhil]

I wonder if this is why I'm undewhelmed with my puma. I'll have to test my voltage drop.

The difference between low voltage and high voltage could be as much as 30 sec a tire. Low voltage is also very hard on a motor and its life.

 

[rockstate45]

The difference between low voltage and high voltage could be as much as 30 sec a tire. Low voltage is also very hard on a motor and its life.

I wonder how much of this is what causes the little guys to burn up? I’m guessing duty cycle, run time, heat and not being designed for 35s causes most of it though

 

[80t0ylc]

Look at it this way, to air down & then air up large tires like we do - frequently, sometimes 30 or more PSI, is extreme usage, really not how most portable compressors are designed to be used. So the beefier or heavy duty you can get or afford, the better performance you will see. To expect getting acceptable performance - the way we use them, out of a bargain basement type of compressor is - at best - living in denial.

 

[Heckraiser]

I've been thinking about a permanent mount for my PUMA. It currently flops around in the back seat footwell and I pull it out and hook it up with jumper cables when it's time to use it. Almost bought the LCP mount, but couldn't quite pull the trigger. I'd really like it out of sight and out of the cargo area.

I'd love to mount under the truck as there is a ton of room down there. I know it would not do well getting dunked in water, pelted with gravel or slush/magnesium chloride. But how about mounting it in a sealed box with an air filter running up via a hose to somewhere clean and dry?

Probably cooler, even in a sealed box, in the shade under the truck as compared to the engine bay, as some have done. Right? What other considerations have I missed?

Not exactly what I have in mind, but this battery box kinda gets the gears turning:

 

[scrapdaddy]

They get pretty hot, I'd be worried about it in that box even with the vent.

 

[Heckraiser]

How about with a 12v computer fan and a vent on each side of the box for cross ventilation?

 

[LandCruiserPhil]

How about with a 12v computer fan and a vent on each side of the box for cross ventilation?

FWIW After 10 minutes of run time on my Puma I can grab the head.

 

[Heckraiser]

I did burn my finger pretty bad last time I aired up and might have "branded" the leather seat a little bit (about 5 minutes after use)

I'm still on the fence about your puma mount. No doubt a great product, but I do use the cruiser for heavy hauling occasionally (construction debris and the like), and like to keep the back completely clear. I'd also want to throw a grocery bag or something over the puma when not in use to dissuade smash and grabbers.