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Old 05-06-2018, 04:36 AM   #1
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Default Super Steer

I'm getting an upgraded suspension in the next 10 days.. these guys from Super Steer in Oregon recommended that install Koni FSD shocks for the stability up and down motion, upgraded and much heavier duty sway bar for side to side motion and a track bar for the "dog wagging" due to high winds from passing trucks and the downdraft when trucks pass and get in front of me.... like a whirlwind sucking us into their wake.....

My extremely trustworthy local RV repair shop said that I really needed shocks..and they directed me to these folks who apparently have been doing research on this stuff and making suggestions for people since 1961....

All of this is expensive, but, so is having an accident due to lost control.... I noticed that going across the USA last fall... I got behind a lot of big rigs and had many encounters with extremely high winds....

The folks at Super Steer wisely pointed out that my vehicle was originally built as an ordinary cargo van from Mercedes..and the conversion changed the dynamics of the van with kitchen equipment, holding tanks, plumbing, refrigerator, toilet and generator.. which sits behind the rear axle making the vehicle have extra weight at the tail end...

Have any of you considered making upgrades like this or are you sticking with the original equipment? My van only has 40,500 miles.. but, even on the last trip..it does feel a little spongy....and traveling over any uneven surfaces makes the cabinets in the rear shake like an earthquake. Not to mention any passengers who sits in the rear bench seat...they bob up and down....

Let me know ....
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Old 05-09-2018, 12:18 AM   #2
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The Dutch VB Air Suspension is what I had for 3-1/2 years. It takes care of all things mentioned I think superbly as I had experience in Sprinter RVs with and without.
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Old 05-09-2018, 03:14 AM   #3
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Dave, I'm absolutely sure that the VB Air Suspension is great..no question... but, I'm not going to put an air suspension on my 2012 Roadtrek RS Adventurous... just a little bit overboard for me...

The folks at Super Steer didn't even mention this and I'm not sure I would like the price...I think an air suspension on a big Class A is probably necessary... Super Steer told me that I should absolutely notice a difference and it would handle a lot better than it does now with the issues I'm experiencing....

You know that when Mercedes Benz builds a cargo Sprinter van even as large as mine is, 3500 with the dual wheels, they don't have any idea on how it's going to be used... The vehicle is shipped from Germany to Canada where Roadtrek custom builds the vehicle on the inside and adds all the equipment... Constant weight ....and the fact that it's top heavy with a generator behind the rear axle changes the dynamic of the vehicle...

I'm sure that Mercedes thought that the cargo van would be used on occasion for loads and unloaded or some of these vehicles get turned into mini shuttle buses..40,000 miles doesn't seem a lot for shocks.. I'll admit.. however, the original shocks may not be the same standard as the Koni FSD.... further, my understanding of these particular shocks is that they compress easier than they expand...so, as they go down they come up more slowly... other shocks perform differently...these shocks are insanely expensive.. about $325 each...

The van has McPherson strut suspension on the front and rear leaf springs...the front is very stable and causes the tail end of vehicle to apparently wag a little for steering correction...SO, that's what the tracking bar is designed to address.....The replacement of the original sway bar almost doubles the size from 1 inch to 1 3/8 inch should make a significant impact on the side to side motion .... I just hope they are correct.....

By the way, the shocks are lifetime guaranteed ... not the labor of course...but, at least the shocks are... nice to know.
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Old 05-12-2018, 12:09 PM   #4
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We put the Koni rear shocks and larger sway bar at around 30,000 miles. It made a huge improvement.

Right now we're waiting for the release of a certain model of Koni strut for the front (my husband placed the order, so I am not sure which one it is). We have an older Sprinter (T1N) and apparently they only produce that model of strut (for T1Ns and whatever other vehicles it fits) when the supply runs out.

I wouldn't hesitate to spend money on these kinds of stability-related upgrades. I also don't let the tires get as worn as I do on my daily driver.
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Old 05-12-2018, 05:07 PM   #5
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Quote:
Originally Posted by InterBlog View Post
We put the Koni rear shocks and larger sway bar at around 30,000 miles. It made a huge improvement.

Right now we're waiting for the release of a certain model of Koni strut for the front (my husband placed the order, so I am not sure which one it is). We have an older Sprinter (T1N) and apparently they only produce that model of strut (for T1Ns and whatever other vehicles it fits) when the supply runs out.

I wouldn't hesitate to spend money on these kinds of stability-related upgrades. I also don't let the tires get as worn as I do on my daily driver.


THANKS, I hope my Sprinter has a much of an improvement as yours did....
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Old 05-14-2018, 11:01 AM   #6
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This just makes sense that suspension needs to be customized to the task at hand. We are waiting to see the results for sure.

Guess one thing that seems surprising is you said your RV repair guy..........I would have expected a Freight-liner guy would need to do such an upgrade?
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Old 05-14-2018, 03:30 PM   #7
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Default I'll let you know in a few days...

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Originally Posted by ponti33602 View Post
This just makes sense that suspension needs to be customized to the task at hand. We are waiting to see the results for sure.

Guess one thing that seems surprising is you said your RV repair guy..........I would have expected a Freight-liner guy would need to do such an upgrade?
Hi Bob,

I'm bringing my van into the shop this morning... they want it for two or three days... they don't want to be rushed...that's OK with me... I have two other cars..I'd rather they take their time and get it right....

My RV shop has been in business for 37 years.... family owned...

They have a 4.6 rating on YELP.....

https://www.superpages.com/bp/agoura...0018692699.htm


I expect to have the van back by Wednesday or Thursday....

---Mark
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Old 05-17-2018, 03:33 AM   #8
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Default Koni and helper springs

I added 'helper springs' (from Sprinter Store in OR) and Koni FSR to the rear of our 2016 PW Ascent. That made a huge difference in the handling and eliminated the sway and bounce. On the 144 chassis there is only one leaf spring and it was nearly flat with all the additions. Ponti is correct that it only makes sense to upgrade the suspension for the increased load.
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Old 05-17-2018, 04:07 AM   #9
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Default Two different vehicles...

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I added 'helper springs' (from Sprinter Store in OR) and Koni FSR to the rear of our 2016 PW Ascent. That made a huge difference in the handling and eliminated the sway and bounce. On the 144 chassis there is only one leaf spring and it was nearly flat with all the additions. Ponti is correct that it only makes sense to upgrade the suspension for the increased load.
Interesting.. that you said it's only necessary to upgrade the suspension for the increased load... my Sprinter has the dual wheels has a gross vehicle weight rating of 11,030 and a gross combined weight rating of 15, 250 pounds....

The gross vehicle weight rating of the Pleasure Way Ascent is around 8,500 pounds....

I can assure you that I am NOT doing a suspension upgrade for the increased load..the standard OEM equipment was installed from Mercedes Benz for these weight statistics..

I'm doing it for the handling and stability... I'm not familiar with KONI FSR... shocks...

I'm having KONI FSD shocks installed...stands for Frequency Selective Dampening....
I'm also getting a larger sway bar to replace the original sway bar by the factory...and a track bar....

My Sprinter is 23 feet long and has a 170 inch wheelbase... completely different vehicle...
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Old 05-17-2018, 02:17 PM   #10
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You might be disappointed in the subsequent improvements but I am sure the improvements will be all in your head anyway. I said VB Air Suspension is probably the only significant improvement in a long wheel base Sprinter. Advanced RV and Airstream have done extensive research to offer this total rear end replacement at an extensive cost. Unfortunately I know of on Roadtrek Adventurous that got VB Air Suspension in Minnesota but had to have extensive reworking of Roadtrek underfloor improvements that added to the cost.
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