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Old 07-05-2015, 01:26 PM   #1
rvthereyet
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Default Sprinter suspenstion upgrades?

A while back, while we were getting our replacement galley window installed in Dallas, TX, we talked with a fellow sprinter owner about suspension upgrades.

He apparently has experience in this area, and highly recommends the below.

While up in Gainesville FL for the front end alignment last month, I talked to the service adviser.

He said that if we brought him the parts, he'd install them, and would not void the warranty.

What we need is someone more versed in this area that I am to chime in with your thoughts.

Thanks in advance.

--Tom

(posted with Bill's permission)...

=================================

Kathy,

I promised to send out the details to the Sprinter suspension upgrades that I have done. So, here are the details.

My issue with Sprinters is they are a bit top heavy (duh) and waddle, wiggle, sway and bounce down the road. Fortunately, the after-market parts people have solved it almost completely. After picking mine up at the factory last month ago it definitely needed some help. I got to know the technical staff at the factory and their official response is: “we are an authorized MB outfitter, so we make no modifications to the Sprinter chassis or MB will pull our license”. They don’t even drill a hole in the frame to add the Unity body. Wow! After further discussion, they admit that the Unity could use some help and most owners do some of the things I did.

The expertise that I bring to the group is MB and Sprinters. I have had a bunch of the MB products and know them better than most. I’m also a bit fearless when it come to twisting a wrench to get something to work better. All of the upgrades that I’m suggesting will not effect warranties. They are not modifications but upgrades. A subtle but important difference. I did all of the upgrades in my driveway with common tools. I have also discussed this with the Plano dealer MB tech. He will be doing my front-end alignment on Thursday. He seemed a bit amused that I was doing all of these Sprinter upgrades in my driveway. All in, it took me 3 hours to install all of it.

If you are reasonably handy, you also can do these yourself. If you need a little coaching, please ask. It will be the best $1,300 you spend on your rig! The ride and performance improvement are unbelievable. We are taking 40 MPH curves at 60 MPH and stuff isn’t shaking out of the cabinets on curves and on entering/exiting fuel stations. The machine simply performs better, is even more pleasurable and safe to drive.

Parts/prices, sources and problem resolution:

My unit - 2015.5 Leisure Travel Vans Unity MB on a 2015 Mercedes Benz Sprinter 3500 cab chassis.

These parts work for a 3500 Sprinter 2007 - 2015:

Koni shock 8805-1047 (2) rear $165/ea, UltraRVproducts.com, keeps the rear end much more composed
Koni shock 87-2657 (2) front $221.50/ea, UltraRVproducts.com, stops the front end from bobbing
Hellwig rear anti-sway bar (1) 7254 $183.62, Amazon, sway/waddle is gone!
SumoSprings front (pair) SSF-106-40 $177.30, Supersprings.com, truck passing and wind sway
SumoSprings rear (pair) SSR-335-47 $185.20, Supersprings.com, truck passing and wind sway
MB camber adjusting bolts (2) , 001-990-77-00 $25, MB dealer, when you change the front shocks you have to have the front-end aligned - theses bolts allow for adjustment.

This sounds complicated but really it is not. I have done the homework for you. I also have the torque specs on all of it.

Bill Case
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Old 07-05-2015, 02:51 PM   #2
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Default Re: Sprinter suspenstion upgrades?

I have all those items installed except the MB camber bolts. Can MB install the camber bolts during regular service, do they usually have these on hand?
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Old 07-05-2015, 03:06 PM   #3
rvthereyet
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Default Re: Sprinter suspenstion upgrades?

Quote:
Originally Posted by jackfish View Post
I have all those items installed except the MB camber bolts. Can MB install the camber bolts during regular service, do they usually have these on hand?
Not sure, but will ask.

By the way, please let us know if your upgrade was worth it, any regrets etc?

Does the RV handle better as he describes?

--Tom
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Old 07-05-2015, 03:09 PM   #4
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Default Re: Sprinter suspenstion upgrades?

" I also have the torque specs on all of it."
would be nice to have that precious list !
Thank you
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Old 07-05-2015, 06:30 PM   #5
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Default Re: Sprinter suspenstion upgrades?

I installed the Sumo Springs only. My problem was the excessive side-to-side sway when exiting some driveways at an angle -- it could really be radical. Since installing the Sumo Springs (not actually springs, but bounce absorbing bump stops), the side-to-side sway still happens, but is damped quickly and no longer goes as far. I'm satisfied with the rest of the ride, so I'm satisfied overall.

I should add that as a former builder of autocross cars my son used to win state and regional championships, I'm very familiar with adjustable, gas pressurized shocks like Koni and Tokico, and with larger, stiffer sway bars. But, I'm not trying to turn my Unity into a sports car. I agree the changes add some measure of security to the Unity, but for me, and in my opinion only, not enough to justify the cost.
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Old 07-05-2015, 10:28 PM   #6
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Default Re: Sprinter suspenstion upgrades?

Quote:
Originally Posted by Custommm View Post
" I also have the torque specs on all of it."
would be nice to have that precious list !
Thank you
From Bill:

"I didnąt keep them but they come in the packaging."

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Old 07-05-2015, 11:04 PM   #7
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Default Re: Sprinter suspenstion upgrades?

*40 mph curves at 60 mph*

Why?
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Old 07-05-2015, 11:23 PM   #8
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Default Re: Sprinter suspenstion upgrades?

Quote:
Originally Posted by Old Crows View Post
*40 mph curves at 60 mph*

Why?
Ditto --
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Old 07-06-2015, 07:12 PM   #9
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Default Re: Sprinter suspenstion upgrades?

Quote:
Originally Posted by rvthereyet View Post
These parts work for a 3500 Sprinter 2007 - 2015:

Koni shock 8805-1047 (2) rear $165/ea, UltraRVproducts.com, keeps the rear end much more composed
Koni shock 87-2657 (2) front $221.50/ea, UltraRVproducts.com, stops the front end from bobbing
Hellwig rear anti-sway bar (1) 7254 $183.62, Amazon, sway/waddle is gone!
SumoSprings front (pair) SSF-106-40 $177.30, Supersprings.com, truck passing and wind sway
SumoSprings rear (pair) SSR-335-47 $185.20, Supersprings.com, truck passing and wind sway
MB camber adjusting bolts (2) , 001-990-77-00 $25, MB dealer, when you change the front shocks you have to have the front-end aligned - theses bolts allow for adjustment.

Bill Case
Thank you Bill for doing the leg work on this.

The swaying when going into or coming out of a parking lot would be my first problem that I would like to stop.

I don't have a problem really with my Serenity when driving down the road, and it appears to be pretty stable with trucks and what not. Drove from Omaha to Chicago a year ago with a 40-50mph side wind, and it was doable. It wasn't enjoyable, but it was doable!! Have driven from Omaha to the West coast 3 times so far this year, and really don't have too much problems with wind.

The biggest problem that I'd like to permanently solve is the "bouncy bouncy" ride that is at the rear of the unit. I've given some thought to the GlideRite technology which uses a bunch of air bags. But I don't know of anybody that has done it. I'd hate to drop $4-5,000.00 and find out I still have the "bouncy bouncy" problem from the unsprung springs. Dunno. Maybe air bags might help a bit.

That and the road noise, but that's another topic.

Chip D

Last edited by Chip D; 07-06-2015 at 07:15 PM.
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Old 07-06-2015, 07:19 PM   #10
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Default Re: Sprinter suspenstion upgrades?

Quote:
Originally Posted by Chip D View Post
Thank you Bill for doing the leg work on this.

The swaying when going into or coming out of a parking lot would be my first problem that I would like to stop.

I don't have a problem really with my Serenity when driving down the road, and it appears to be pretty stable with trucks and what not. Drove from Omaha to Chicago a year ago with a 40-50mph side wind, and it was doable. It wasn't enjoyable, but it was doable!! Have driven from Omaha to the West coast 3 times so far this year, and really don't have too much problems with wind.

The biggest problem that I'd like to permanently solve is the "bouncy bouncy" ride that is at the rear of the unit. I've given some thought to the GlideRite technology which uses a bunch of air bags. But I don't know of anybody that have done it. I'd hate to drop $4-5,000.00 and find out I still have the "bouncy bouncy" problem from the unsprung springs. Dunno. Maybe air bags might help a bit.

That and the road noise, but that's another topic.

Chip D
FWIW, If you want to stop the side to side oscillations..... I'd go with the SUMO bump stop replacements (rubber baby buggy bumpers) that fit snugly between the axle and the frame. That works.....
Start with the rear and see how that works. More springs, stiffer anti-roll bars are NOT the solution. And they are not expensive.....

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