View Full Version : brought the truck home today...quick question.
LOWGREEN1
09-20-2005, 12:06 PM
I bought my truck home today but I have a question about the back F9000's. I have to run two different pressures in the back. I'm running about 80 on the left (gas tank) and about 40 on the right. Does this seem right?? or is something wrong??
40psi difference seems a little high but it shouldn't be a problem since most bagged guys need higher pressure on the driver side to compensate for the tank.
LOWGREEN1
09-20-2005, 12:23 PM
40psi difference seems a little high but it shouldn't be a problem since most bagged guys need higher pressure on the driver side to compensate for the tank. That's just what I'm running right now. I can adjust each side to get them closer..like drop the left side a little and raise the right side. I'm going to play with it a little more to see what I can come up with. Thanks.
That's just what I'm running right now. I can adjust each side to get them closer..like drop the left side a little and raise the right side. I'm going to play with it a little more to see what I can come up with. Thanks.
No prob. I think the psi change from driver/passenger on the KP's I installed were around 25psi more on the driver side and on the 83 with F9000's it was around 15psi higher on the passenger side for the tank.
I run ~10psi less on the passenger side with my KP 6-link. A 2:1 ratio of air pressures seems way off to me though
LOWGREEN1
09-20-2005, 06:24 PM
I run ~10psi less on the passenger side with my KP 6-link. A 2:1 ratio of air pressures seems way off to me though I got them dialed in tonight. I'm running 65 on the left side and about 58-60 on the right. I just had to play with it some and get it right.
Beyond Static©
09-20-2005, 09:28 PM
werd, at the most, I have a 5psi difference side to side.
Toolman
09-20-2005, 11:27 PM
It could also be the guages. I would not be concerned with up to 10 psi difference. ANy more and I would double check things.
I got them dialed in tonight. I'm running 65 on the left side and about 58-60 on the right. I just had to play with it some and get it right.
Sounds good. :cool:
The length of lines plays a role in it too. :read:
The length of lines plays a role in it too. :read:
How do you think?
If you have (for example) 12' of line on one bag and 2' on the other.....they will take different amounts of volume/pressure. The air line acts as part of the volume of the bag.
If you have (for example) 12' of line on one bag and 2' on the other.....they will take different amounts of volume/pressure. The air line acts as part of the volume of the bag.
Keerect.
dapolice1
09-21-2005, 08:12 PM
If you have (for example) 12' of line on one bag and 2' on the other.....they will take different amounts of volume/pressure. The air line acts as part of the volume of the bag.
You sure? I would think that volume does not effect pressure in this case. Pressure is the amount of force applied to that side of the sealed air system and volume is the amount of air in each side, which are two diffrent measurements..
With the same amount of Pressure applied to both a 2' and 12' line the 2' section will flow more volume in a shorter amount of time than the 12', but if you increase pressure it will flow as faster or faster on the longer section. In a bagged truck your pressure would be a constant and therefore equal, whatever your tank output pressure is. It would take longer to get the longer line to fill to the same pressure as the shorter, but it would not cause it to require more pressure.
Am I missing something or misread your post.
Low88
09-21-2005, 08:21 PM
You sure? I would think that volume does not effect pressure in this case. Pressure is the amount of force applied to that side of the sealed air system and volume is the amount of air in each side, which are two diffrent measurements..
With the same amount of Pressure applied to both a 2' and 12' line the 2' section will flow more volume in a shorter amount of time than the 12', but if you increase pressure it will flow as faster or faster on the longer section. In a bagged truck your pressure would be a constant and therefore equal, whatever your tank output pressure is. It would take longer to get the longer line to fill to the same pressure as the shorter, but it would not cause it to require more pressure.
Am I missing something or misread your post.
after thinking about it some more....i agree with you. only thing that will vary is the fill time (impacted by the larger volume of the longer hose.). The pressure required to lift the truck will still be the same.
Beyond Static©
09-21-2005, 08:59 PM
more volume will take less pressure to fill. Think of using an 18wheeler bag vs a 2600lb bag. The big rig bag will take much less pressure to air up, due to a larger volume.
If you have (for example) 12' of line on one bag and 2' on the other.....they will take different amounts of volume/pressure. The air line acts as part of the volume of the bag.
P=F/A Where does volume come in?
dapolice1
09-21-2005, 10:02 PM
more volume will take less pressure to fill. Think of using an 18wheeler bag vs a 2600lb bag. The big rig bag will take much less pressure to air up, due to a larger volume.
Sorry Kyle I respect your opinion, but I have to disagree.
The pressure is not used to overcome the amount of volume needed to fill two diffrent sized chambers. The material that the volume of air has to overcome would be the factor there.
More like trying to blow up a simple ballon versus a semi truck inner tube that is in the tire and the loaded semi sitting on it. Oh blowing it up with your mouth. The ballon can be done with minimal pressure, but your lungs can not produce enough PRESSURE to do the semi.
Now if your using identical containers for the air, same bags and same rigid supply lines, then the length of those lines should not effect the pressure needed to fill that container. Pressure is used to overcome the resistance applied in the bag/ line setup. Volume is simply a measure of the amount of air in the lines.
Now, in the 12' line you may have say 100 square inches of volume at 60 psi, and in the 2' you may have 25 square inches of volume at 60 psi. The pressure is the same simply the amount of air in each side changes.
dapolice1
09-21-2005, 10:14 PM
P=F/A Where does volume come in?
Thought pressure was P=FxA
Pressure it is force times the acceleration.
Volume would be what your applying the force and acceleration to. When you apply force and acceleration to a volume of air that will give you the pressure.
Thought pressure was P=FxA
Pressure it is force times the acceleration.
Volume would be what your applying the force and acceleration to. When you apply force and acceleration to a volume of air that will give you the pressure.
No.
Pounds PER square inch
Newtons PER meter^2
http://en.wikipedia.org/wiki/Pressure
F= M*A , Newtons second law
dapolice1
09-22-2005, 12:02 AM
No.
Pounds PER square inch
Newtons PER meter^2
http://en.wikipedia.org/wiki/Pressure
F= M*A , Newtons second law
I am corrected.
I was trying to put so much in the response I got them backwards. Same principal applies in any case. Actually the force could be used in place of pressure in this case as well. To illistrate the same thing.
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