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Old 10-30-2014, 03:10 AM   #1
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Center point suspension

Would like to get input on the Center point airbag system. Getting a unusal amount of porpoising on my 39 mb on a 14 F 350 with 5000 pound airbags and joust bumpers.
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Old 10-30-2014, 04:56 AM   #2
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Boy, put your money towards the Trailair Tri-glide pin-box instead! (which I assume you don't have based on your signature pic) I get nothing - no porpoise, no chucking, just a pleasure ride! Maybe an occasional "whoop-de-do" on the frost heaves, but that's the end of it. Most pleasurable tow I have ever had. I have the same truck and airbags you do.

Not just boasting about something I paid a lot of money for either, because I didn't and I didn't even know much about it when I checked the box on the order sheet. It was just a nice surprise.

On a side note - you might check your axle weight and pin weight. Porpoising could be as sign of a light nose which could be fixed with a little reconfiguration of the cargo...

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Old 10-30-2014, 05:23 AM   #3
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Got a Rota-Flex on now. Had a FifthAirborne on a 2006 Jayco Talon 36 v (TRI AXLE TOYHAULER), wasn't completely sold. Also I was pulling with a 08 F 450. So....I don't know if I am missing the tri-axle or the 450. The talon also had six shocks....why don't Redwoods have them. Has anyone tried them.
Thanks atom for the comeback. Been watching your post for a while, keep up the good work!!!!
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Old 10-30-2014, 05:39 AM   #4
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Oh....on the light nose, these things come off the line at 14076 and only 2270 on the pin, do you have the ratio formula? As soon as the corn guys get caught up, I am going to do a scale run as I like to know where my stuff is. As a 33 year vet in some type of rv, we pack very minimal, but I am gulty of having five or so gallons of water in the black tank (and the 39 mb has two) and I carry two lights on the monitor of fresh water as we like to Sam Walton camp.
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Old 10-30-2014, 11:53 AM   #5
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We still have not got the Tri Glide Pin Box ride down quite yet.
Ours rides great most of the time but on a bridge or significant bump at highway speeds, it sends us for a quite ride to the point of I have to put on brakes to calm it down.
We made several cross country trips with our previous 5th Wheel (Jayco Pinnacle) with a MorRyde Pin Box, it had a much better rough road ride than our Redwood does. The Pinnacle had a pin weight of 3,700 lbs. with a loaded weight of 15,800 lbs.
I think a lot of our problem with our 38FL is not enough Pin Weight and in some cases we are coming off the trucks overload springs and back down on them pretty hard.
We will be at our home base for about 2 month for Thanksgiving and Christmas, will look at options to improve rough ride before hitting the road again in January.
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Old 10-30-2014, 01:04 PM   #6
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I was reading on another forum that some of the folks were only running about 20 psi in their air bags. This could cause the proposing as well. I have a heavy pin weight but I get the best results in running 85-95 psi in my bags.
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Old 10-30-2014, 01:08 PM   #7
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I run about 70 psi in my Air Bag, at 70 psi the shock absorber is just about fully extended when sitting still.
If I run the pressure much lower, the Air Bag / Hitch will bottom out pretty easily.
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Old 10-30-2014, 02:58 PM   #8
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Sorry...I'm referring to the "air bags" on the truck not the hitch.
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Old 10-30-2014, 02:59 PM   #9
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The Op was about Center Point but the discussion has focused on the PinBox, two different things that could potentially have different impact on towing.

The TrailAir pin box is a huge help on smoothing out the ride in the truck by absorbing the chucking caused by opposing forces between the truck and rig, especially at bumps or bridge expansions. Finding the sweet spot is a trial and error process, some choose to gauge it by Psi some use the arrow hep box as a guide, I personally use the arrow and inflate so that the outside portion of the piston is at the lower edge of the arrow going [for the pressure geeks it is ~70PSi].

The Center Point is a replacement for the EquaFlex suspension system and uses an air bag system to reduce the shock and vibration and will smooth out the ride within the rig. Some of our forum members have opted for the Center Point, all I know of are happy with the upgrade. Others on the forum have opted for a the MorRyde IS, a total suspension replacement and those who have made this change also seem very happy with the change.

The porpoising that redwoodin with remy spoke of would most likely be be a factor of pin weight so if one of the two mods were to be chosen to address this I would think it would be the PinBox and/or getting more weight on the pin which could easily be accomplished by carrying more fresh water.
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Old 10-30-2014, 03:24 PM   #10
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Brian,

I'm running 4,320 lbs on the pin with water and gear, (about 3,480 without water or gear). 12,900 on the axles.

That's a 25% ratio with water, 21% without. May be a little on the heavy side, but that is kind of how Redwood designed the 36RL.

We had the 5th airborne before also - and it did well, but not as well as this Trailair.

Upgrade to the suspension - shocks or otherwise, is probably not going to impact chucking or porpoising, at least not directly.
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