Community Forums

Rich-n-Linda · 04-05-2014, 07:39 AM

I recently installed four of these things:

on our coach with the Freightliner XC-R chassis.

The sales pitch for them said they would improve the ride, cut down on leaning in the corners and make the coach more stable. What I found was that they do all of that...and more!

These devices are basically "chokes" that slow down the movement of air through them. They are installed in the air lines feeding the air bags. The end result is that when the coach wants to lean over a bit in a corner, these things don't allow the air to move out of the air bag very fast, meaning that the coach doesn't lean near as much as it used to in corners. Our coach used to oversteer a little on sweeping corners. I would start into the corner, the coach would lean over a little and I would have to correct my steering a bit because the rear of the coach wanted to come around a little. Classic oversteer. It does not do this any more.

When entering or exiting an angled driveway or parking lot, there is now no rocking back and forth as used to happen. Now the coach just moves over the angled surface with no rocking at all.

These things are a bit expensive, but in my opinion the improvement in the ride and handling was well worth it.

I got mine from RV Upgrades. The come in different size and weight ratings. The Freightliner XC-R chassis is over 30,000 pounds and uses 1/2" units in front and 1/4" units in back.

1ciderdog · 04-05-2014, 09:52 AM

I have them and they do help reduce the "Walmart wobble". I bought mine from Hendersons Line Up in Grants Pass, OR.

Fred Cooper · 04-05-2014, 09:54 PM

I assembled my own from common parts for the front axle, at a cost of less than $60.00.

Info in link below:
http://www.irv2.com/forums/f258/expe...gs-179877.html

I have done the rear axle yet, but with separate ride height valves on each side I don't think the improvement will be as much. I still plan to make them for the rear also.

If you decide to do this and use the same valves that I used, the best compromise between control and ride harshness is about 6 turns out from fully closed on the adjustable valve.

Fred

sdlowe11 · 04-06-2014, 05:37 AM

I had the Motion Control Units installed at Henderson's Lineup as well. They are top-notch for suspension work and I like that they first evaluate your coach with a road test and then give you options regarding which upgrades can most improve your ride. You select the ones you want them to install, then they go with you for another ride after the work is completed to get your impression of the results. I had Koni shocks and a Safe T Plus steering control unit installed at the same time, and the results were dramatic. Expensive, yes, but I have enjoyed the improvements during 2 years of full timing since the work was done, even helped me to get through Alaska in one piece!

moisheh · 04-08-2014, 06:02 AM

Installing a home made device in an air system is not always a good choice. All parts of your air system must be DOT approved. If the flow control from a hardware store is plastic I doubt it is approved. Your air bags are part of the suspension system and must be "safe". Any connectors and lines must also be DOT.

DebbieMH · 04-10-2014, 04:30 PM

Quote:

Originally Posted by sdlowe11

I had the Motion Control Units installed at Henderson's Lineup as well. They are top-notch for suspension work and I like that they first evaluate your coach with a road test and then give you options regarding which upgrades can most improve your ride. You select the ones you want them to install, then they go with you for another ride after the work is completed to get your impression of the results. I had Koni shocks and a Safe T Plus steering control unit installed at the same time, and the results were dramatic. Expensive, yes, but I have enjoyed the improvements during 2 years of full timing since the work was done, even helped me to get through Alaska in one piece!

I'd like to take our coach to them to maximize the driving experience. Where are they located?

Silver007 · 04-10-2014, 05:14 PM

Quote:

Originally Posted by Rich-n-Linda

I recently installed four of these things:

on our coach with the Freightliner XC-R chassis.

The sales pitch for them said they would improve the ride, cut down on leaning in the corners and make the coach more stable. What I found was that they do all of that...and more!

These devices are basically "chokes" that slow down the movement of air through them. They are installed in the air lines feeding the air bags. The end result is that when the coach wants to lean over a bit in a corner, these things don't allow the air to move out of the air bag very fast, meaning that the coach doesn't lean near as much as it used to in corners. Our coach used to oversteer a little on sweeping corners. I would start into the corner, the coach would lean over a little and I would have to correct my steering a bit because the rear of the coach wanted to come around a little. Classic oversteer. It does not do this any more.

When entering or exiting an angled driveway or parking lot, there is now no rocking back and forth as used to happen. Now the coach just moves over the angled surface with no rocking at all.

These things are a bit expensive, but in my opinion the improvement in the ride and handling was well worth it.

I got mine from RV Upgrades. The come in different size and weight ratings. The Freightliner XC-R chassis is over 30,000 pounds and uses 1/2" units in front and 1/4" units in back.

I was looking at these. Any issues when you dump air for leveling jacks?

Thanks

Rich-n-Linda · 04-10-2014, 07:27 PM

I have not noted any difference when dumping the air. Works fine.

Pusherman · 04-10-2014, 08:39 PM

I have them on my coach, and they definitely handling turning stability, like a sway bar on a gas chassis.

No issues on dumping the air.

RV4Me4Life · 04-12-2014, 06:18 AM

Hello Rich-n-Linda,
Will you share the make and model of your coach, etc.? Your profile does not disclose this information.

Sent from my iPad using iRV2 - RV Forum

Rich-n-Linda · 04-12-2014, 05:54 PM

We have a 2006 Mandalay 40E. It is built on the Freightliner XC-R chassis. This is their 2nd level, raised rail chassis with independent front suspension. This upgrade would apply to the XC-S chassis as well. This is the Freightliner chassis with the I-Beam front axle.

I just added that info to our profile. I never realized is was not there. Thanks for mentioning that.