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Thread: Sumo spring vs road master
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01-19-2021, 03:39 PM #1
Sumo spring vs road master
Wondering if anybody out there has any experience with sumo springs and or shocks? I’m wanting to put one or the other on my 311 BHS the spring and I’m trying to figure out which one would be the best route to go because they are about the same price. I currently have the CRE4000 and I’m trying to do whatever I can to make things a bit smoother.
Thanks
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01-19-2021, 05:18 PM #2
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There have been a number of discussions about this. Using the search function and entering either sumo or shock or shocks will produce some of those theres.
Here is one such example....
I've got a set of Sumo Springs on order and should get them in early next week.Larry KE4DMG
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01-19-2021, 05:51 PM #3
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01-19-2021, 06:55 PM #4
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It seems like the Sumo or Timbrens might offer a somewhat harsher ride as compared to air bags. There's a gap between Sumo and Timbrens and first contact. That means that it's not until the suspension compresses that either one of the two are in contact. So there would be some jarring or harshness when this happens. Big Truck Rv's YouTube channel demonstrated this. So if you're driving around unloaded with the Sumos or Timbrens out of contact, then hit a bump or dip that causes the suspension to compress, you might feel some jarring or harshness.
Air bags OTOH are in constant contact during their entire travel. There is no gap, so there should not be a harsh transition between loaded and unloaded. You can vary the air pressure in the air bags which would alter the rebound rate.
What would be interesting is to pair Sulastics with air bags. That would seem to be the ideal combination.2017 Ford F450 - our kids call her "Big Red"
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01-20-2021, 10:32 AM #5
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For sure! I'll be running from Central FL up to Brunswick, GA on I-95 the first of February. We been on the road a lot. So I am looking forward to what, if any, difference there is (and hoping for a bit less 'bound' in the RV). Keep your fingers crossed.....
Did BTBRV have the Sumos on a truck or on a fifth wheel? From what I see and the way the Sumo installation instructions read the "spring" get pre-loaded upon installation. So until there is a good bounce they should be in contact with the frame. Time will tell.Larry KE4DMG
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01-20-2021, 03:12 PM #6
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If there is a gap they were not correctly installed as per the instructions. Installation of the RV trailer models are different than truck suspension types. They come with two spacers and two sets of bolts to insure positive contact. When sitting on the ground the Sumos should be preloaded. There is no jarring or harshness imparted to the ride, quite the contrary. The construction of the foam used is engineered as an absorption medium as well.
Powerscol in doing modifications raised his frame and went to Supersprings with his problem. They provided additional spacers and longer bolts to install properly.
My experience with over 1300 miles on them is I'm happy with the results. IT was money well spent for an easy quick solution. Ride and especially handling is a profound difference. Stability around curves is greatly increased. The best thing is they are completely passive, no need to adjust or fuss after installation.Last edited by Wicked ace; 01-20-2021 at 03:14 PM.
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01-20-2021, 04:36 PM #7
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I just ordered mine a few days ago after some advice from Powerscol and waiting on delivery. I'm in place until late March or early April so won't be able to report results for awhile. I'm not especially mechanical so this should be interesting.
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01-20-2021, 06:30 PM #8
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Fast forward to 10:00 on this video. You can clearly see that the Timbrens are not in contact with the axle as the vehicle is going down the road.
https://www.youtube.com/watch?v=exjUpKA6OJ8
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01-20-2021, 06:46 PM #9
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01-20-2021, 07:27 PM #10
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2017 Ford F450 - our kids call her "Big Red"
2018 Grand Design Reflection 28bh
Re-pack bearings necessary?
Yesterday, 09:29 PM in Axles, Brakes, and Suspension