Hydro bump stops (1 Viewer)

[jtwopark]

hmmm

 

[Corbet]

Those who fitted the Timbrens, did you fit the standard compound or the softer compound developed for the 100 series.....?

The Timbren process for me was a pain in the ass. I originally ordered the standard rear set for the 80 series (overload springs) from e-trailer.com. Then dealt with Timbren direct to get softer bumps as well as shorter mounting plates. The whole process took a couple months. The flip side is that Timbren was good about simply sending out progressively softer bumps and never wanted any of the old ones back. So I ended up with a set that worked up front as well. My fronts are not as soft as the rears but they were "free" if I don't value my time.

For anyone going this direction I would recommend dealing with Slee or someone else who is selling Timbrens for our applications.

 

[tacosupreme]

Does any brand bump stop have slow speed bypass or adjust ability not to effect normal speed articulation?

All "real" hydraulic bumps will compress easily on slow speed stuff and will not effect articulation. With no nitrogen pressure you can kinda feel how the valving works by hand, just push down on them and you can feel the oil pushing around the shim stack. I have ran many brands and types of bumps over the years, including timbren, lightracing, and traditional hydraulic bumps from king, fox, and radflo. Timbrens are just rubber springs, and by increasing the spring rate on hard hits causes a lot of bouncing. They are great for street/pulling a heavy trailer, not great offroad. The lightracing jounce shocks were amazing while they worked, however they are nearly impossible to rebuild at home and only lasted me about a year before puking oil out. I sent them off for a rebuild and sold them for Radflo's. Those have been on my taco for almost five years, probably 30K dirt miles. No leaks or issues at all. Once a year, I pull them off, clean them, have a look at the oil, reassemble, charge to 130psi and forget about them for another year. The wear pad on the contact foot needs replaced, other than that they work as well as the day they were installed. I wonder if the 4runner kit from Icon would work for us?

 

[Mieser]

I think I remember Icon saying the 4runner kit wont fit with the stock FJ80 rear floor.....

 

[redstang410]

 

[GW Nugget]

Geez, this is your rig with the 38.5" Swampers. Will you post up some side shots of your rig on the ramp. Maybe in your build thread or here?

 

[jtwopark]

Interesting to see not many people run bump stops.

 

[tacosupreme]

Interesting to see not many people run bump stops.

I just don't want to drop 10K in suspension on a rig I paid 5K for! Bumps alone won't help all that much, and with a rig this heavy they will need some help in the form of 2.5" or larger shocks.

 

[jtwopark]

the suspension shouldnt be more than $7500 tops!...might be worth it in the long run.

 

[redstang410]

The real advantage of running hydro bumpstops in the rear of my rig is that it helps in roll stability when i run fully loaded for long trips.
the 4 inch bumps ride continuously when loaded. so it helps control roll when cornering. It makes faster trail driving actually fun rather than scary.

My 80 weighs over 7500 pounds fully loaded.

the front bumpstops hardly ever touch, but when they do, they really take the edge off the hit.

 

[AutoCraft Aus]

I like to run them built into our shocks with our kits, once the piston goes past the manifold.

40-50mm is more than enough with 12" stroke to catch.

Ideally your bumps shouldnt be part of your travel from ride height as they arent set to be a shock, and normally end up cooking and spewing fluid.

 

[alia176]

I'm a newbie when it comes to these things but unless I'm doing high speed baja style driving, I don't know if I really *need* jounce stops. I'm running tall rubber bump stops, similar to the Timbren units that I grabbed from either a Montero or a Trooper, can't recall. They're three times the length from OEM and does the job OK I guess.

Seems to me that if proper shocks were installed on the 80, then jounce shocks aren't needed? I dunno, I'm a newbie. I was running 7100s for a long tme and now running OME Sport shocks and I think I'm over driving these shocks. I do like to drive fast on dirt roads but those few and far between. Mostly, I need the body to stabilize quickly and especially with a RTT on 4" slee springs. Someday I may need to pony up for the 2.5" some type of hoity toidy shocks.

 

[Mieser]

Generally, I think you have a hard time running enough compression valving to prevent the vehicle from bottoming out when driving spirited yet soft enough valving to allow a comfortable day to day ride. There are some ways around this like bypass shocks or flutter stack valving. A good bumpstop can give you a little more spring rate and additional valving for the last few inches of up-travel.

Most tall rubber bumpstops provide the spring rate component, but do nothing to provide any damping. This can create a situation where the suspension 'bucks' or blows through the rebound damping. I don't think you can realistically add rebound damping to deal with the kick off the bumpstops without having other issues.

 

[woody]

The Timbren process for me was a pain in the ass. I originally ordered the standard rear set for the 80 series (overload springs) from e-trailer.com. Then dealt with Timbren direct to get softer bumps as well as shorter mounting plates. The whole process took a couple months. The flip side is that Timbren was good about simply sending out progressively softer bumps and never wanted any of the old ones back. So I ended up with a set that worked up front as well. My fronts are not as soft as the rears but they were "free" if I don't value my time.

For anyone going this direction I would recommend dealing with Slee or someone else who is selling Timbrens for our applications.

Any pics of your rears installed? Ordered up a set...with the suspension drooped, the passenger side contacts the spring, and the drivers side is solid into the tire (ie: can't even install). Curious to the height of the mount plate too, the ones I received seem like the bump will be in contact with the axle at daily ride height (no gear loaded)

N/M, saw your earlier photo...those are MUCH shorter than how they arrive from Timbren...time to break out the plasma I guess...

 

[Corbet]

Yah. I went through a couple phone calls to Timbren to get what I really needed. The original kit they sent me would not even fit between the frame and axle housing. Even with my 2" lift at the time. I don't know how anyone could run what I got the first time with a stock truck. I later received a softer bump and much shorter steel spacer than the original "overload" kit. Its been 6 years since my install but I seem to remember clearancing the bracket with the angle grinder a little to prevent spring contact.

Pic for everyone else so they don't have to search.

 

[nukegoat]

I have hydraulic bump stops. There's a lot more tuning regarding oil level and nitrogen pressure and stroke length that can really make or break people's impressions of them. I don't think most people need them.

 

[alia176]

Yah. I went through a couple phone calls to Timbren to get what I really needed. The original kit they sent me would not even fit between the frame and axle housing. Even with my 2" lift at the time. I don't know how anyone could run what I got the first time with a stock truck. I later received a softer bump and much shorter steel spacer than the original "overload" kit. Its been 6 years since my install but I seem to remember clearancing the bracket with the angle grinder a little to prevent spring contact.

Pic for everyone else so they don't have to search.

View attachment 1637896

What's the Timbren p/n did you end up with and do you have or add any special notes when ordering so that the correct "softness" arrives?

Thanks man.

 

[Corbet]

What's the Timbren p/n did you end up with and do you have or add any special notes when ordering so that the correct "softness" arrives?

Thanks man.

Way too long ago to remember. I ordered the kit based on year/make/model from Etrailer. Upon arrival I called Timbren complaining about fitment. They sent me a handful of different things to try. In some ways it was a royal PITA but I did end up with something that worked up front too for free.

If I were to do it again I'd go through someone in the LC world to get the right thing first. I think Slee and Just Differentials both carry them. Timbren's policy is pretty much try what we send you then call back to tell us what you want different.

 

[woody]

Mine were from Just Differentials...emailed with Jeremy this morning and directed him to this thread....he is going to address it with Timbren.

Oddly, he sells a few a month and has had zero reports of fitment issues. Guess i got to be "that guy"

 

[woody]

Here are mine from Sundays test fit...will be modding soon re: Corbets pic

Suspension at full droop