daystar bumps

[towerace1]

Has anyone seen these? Or is anyone using them? I think they are a cool idea and are a lot less $$ than the air bumps.

[towerace1]

Here is the info from their web site..

Effective suspension travel control is a critical element to all off-road suspension systems. Conventional bump stops may be acceptable for stock street applications, but off-road enthusiasts need something tunable and much stronger than conventional stops. Daystar’s Stinger Bump Stops now offer total suspension control in one affordable package.

Inspired by race bump stops that are used in many different off-road niches, Daystar Stinger Bump Stops use Daystar’s revolutionary EVS foam technology. EVS is a microcellular foam material that is available in two different densities. EVS has a true progressive spring rate and is designed to be cycled thousands of times without degrading. Each Stinger Bump Stop can carry between one and three EVS foam inserts, allowing the user to easily adjust the firmness of the Bump Stops.

Combine the different densities of the EVS material available with the adjustability of the Stinger piston shaft, and you have a bump stop that can be adapted to all needs and uses. The outer shell of the Stinger is machined from heavy gauge tubing, while the bronze guide for the piston shaft ensures long life. Thanks to the overall design, Stinger Bump Stops are fully rebuildable. Best of all, Stinger Bump Stops are a fraction of the cost of nitrogen-charged bump stops while offering the same performance attributes.

Daystar Stinger Bump Stops are sold in pairs or indivdually, in two different lengths, making them adaptable to just about any vehicle. They also work with most racing-style “bump can” mounts, while weld-on and bolt-on mounts are available separately.

[randomthoughtsracing]

I havent yet seen them in use. A Bumpstop is a rising rate airspring with some valving adjustability. A foam filled stop like this could mimic the effect of compression spring depending on the foam used. I am curious however to know how the foam reacts on rebound. A bump with valving drops out at a slower rate than the suspension so that it wont spring the vehicle into the air. A foam system does not have any rebound control mechanism and I suspect that it will come popping out pretty quickly. Perhaps if air were purged from the can on compression but the air refill rate were regulated the rebound could be controlled some what.

This does seem to fix the issue of jounce bump deflection and that would occur if mounting foam or rubber stops between the axle and frame.

[convoy]

IMHO this would alleviate the shearing of conventional urethane bumps from its metal mount, but somehow it feels as if technology is going backwards?? Seems as if this is the first generation of a hydro bump. If it’s anything like the suspension forks on my mtn bike I wouldn't waste my money. The urethane material, no matter what tensile strength, will collapse to an extent before the confined cylinder will not allow any more deformation. Why not shove tennis balls in your coil springs....

I think a combination of the urethane bumps and a coil spring inside this cylinder would be better, but still the unconfined bump stop with the partial cup (I think its the OEM Nissan ones) appear to be a compromise between the two ideas of a confined and unconfined bump stop.

Good point Random, they took out the control of rebound!

[tcm glx]

Also, they are not that cheap.... retail price is about 150-180...... that is about the cost of one air bump, for another 150, you would be set with the real deal hollyfield!

[SteveG]

I am curious however to know how the foam reacts on rebound

That was my immediate thought. Still, depending on the price it's not a bad idea. And possibly a great idea from a marketing standpoint.

Who's going to be the guinea pig?

[Nick]

That is just a fancy version of a coil spring insert, something that autofab has sold for years.

[towerace1]

Here is a video that somewhat explains them better. They are 150.00 for two (set) not that bad the video kind of shows how they plan to controll rebound. I might buy them to test them out.

http://www.youtube.com/watch?v=UtJm8W_BIjs

[convoy]

IMO It appears the rubber mat that they depress the bump stop in exaggerates its compression range, a marketing ploy if I do say myself. I still think it’s a waste of money. Extreme temperatures alone and the lack of rebound control would not suit our vehicles very well.. I think these would be more common on a rock crawler or a trail rig.

[bajascott]

you can buy air bumps used for close to that amount.

[magic carpet XLT]

that video doesn't do much to show how they work. how about some on car footage?

they seem really easy to work on, and for jeep guys that just want the look they will probably sell a lot.

[randomthoughtsracing]

IMO It appears the rubber mat that they depress the bump stop in exaggerates its compression range, a marketing ploy if I do say myself. I still think it’s a waste of money. Extreme temperatures alone and the lack of rebound control would not suit our vehicles very well.. I think these would be more common on a rock crawler or a trail rig.

Having attended a number of trade shows I can say that the rubber mat under the carpet isnt marketing its just part of the booth to reduce the fatigue of those standing there all day. You can see the same car in the background so the whole thing was filmed at a show.

One application I could think this may work well on is the front of a truck where the bump mounts on the axle. I have seen this setup on Dodge trucks and the problem with a standard inverted hydro bump is the air bubble causing initial travel to cycle in air then suddenly hit oil (there are ways around this though). The unregulated rebound might help pop the nose of the truck also. Still not sure this would be good on the rear of a go fast Bronco.

[78Class3]

Off Road Magazine had a little blurb about them and I believe tested them on one of their project trucks af ew issues back. They did not recomend them for a race vehicle, but would said that they would probably work well for the occasional big hit if i recall.

[Squarehead]

Yeah, Daystar showed 'em to us back in September at the Heavy Metal Weekend event in Pismo. They're actually pretty cool, and I really liked the ease in which you could change the inserts. They'd probably work pretty well on a number of different trucks, although I've only seen them on one. Obviously not for race vehicles, but they could be a good value for the prerunner hobbyist.

[shockseals.com]

Foam depending on type will have no effects on rebound. I have done some testing and work with some OEM manufacturers regarding foam. Good foam doesnt effect rebound. Daystar stuff may or may not be good. I know we were buying an open cell shaft foam bump that was BASF material that worked well. They no longer sell it due to the time it takes to make them.